CN113862493B - Method for co-processing and utilizing arsenic-containing materials in nonferrous smelting - Google Patents

Abstract

The invention provides a method for the synergistic treatment and utilization of nonferrous smelting arsenic-containing materials, wherein arsenic sulfide in arsenic sulfide slag in a low-temperature inner cylinder generates solid metal sulfide and gaseous arsenic trioxide. The smelting smoke dust in the high-temperature inner cylinder or the solid arsenic trioxide in the oxidized metal mineral powder is heated to be in a gaseous state. The low-temperature inner cylinder and the high-temperature inner cylinder are infinitely close to an oxygen-free atmosphere, and carbon powder is input into the high-temperature inner cylinder. The method for the synergistic treatment and utilization of the nonferrous smelting arsenic-containing material has the advantages that multiple materials are subjected to synergistic treatment, arsenic is removed, sulfur is fixed, valuable metals in reactants are upgraded in a vulcanization mode, and the sulfur in the reactants is reserved, so that the subsequent pyrometallurgy is facilitated; compared with traditional furnace types such as a fluidized bed, a blast furnace, a reverberatory furnace and the like, the flue gas quantity is very little, the sulfur loss is small, and the secondary pollution is low; the method has strong adaptability, can adjust corresponding process parameters and material addition proportions according to different non-ferrous metal smelting products, has good effects, simple process flow and can realize industrial large-scale treatment.

Description

Method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting

technical field

The invention relates to the technical field of solid waste treatment, in particular to a method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting.

Background technique

In industrial production, the arsenic sulfide slag will be stacked together for centralized treatment after it is formed. The main component of arsenic sulfide slag is As ₂ S ₃ , and the commonly used treatment methods are divided into fire method and wet method. The fire method is mainly roasting method, and the wet method mainly includes alkali leaching method, ferric sulfate leaching method and copper sulfate replacement method. Fire method: The recovery rate of arsenic is low, which is easy to cause environmental pollution and poor product quality. Alkaline leaching method: the amount of sodium hydroxide is large, and the operating cost is high; ferric sulfate leaching method: the process is more complicated, the material is returned in the process, the product impurity content is high, and the investment is large; copper sulfate replacement method: the recovery rate of arsenic Only around 55%.

Smelting fume is the fume produced by the products of volatile elements taken away with flue gas and condensed by dust collection during the smelting process of non-ferrous metals such as gold, copper, tin, lead, zinc, etc. Its main compounds are composed of: CuO, PbO, ZnO , As ₂ O ₃ , Fe ₂ O ₃ and K ₂ O, etc. The composition of smelting smoke and slag is quite different, and there is no unified treatment method.

Therefore, it is necessary to provide a method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting to solve the above technical problems.

SUMMARY OF THE INVENTION

The invention provides a method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting, so as to solve the purpose of co-processing of sulfur-containing arsenic-containing materials and arsenic-containing metal oxides in the prior art, which is to remove arsenic, and the main process is pyrotechnic. , the loss of sulfur cannot be avoided, and the effect of arsenic removal is not good, the environment is seriously polluted, and there is a great safety hazard in industrial production, which is not conducive to the technical problem of secondary resource utilization of the treated tailings.

For solving the above-mentioned technical problems, the technical scheme of the present invention is:

The invention provides a method for synergistic treatment and utilization of arsenic-containing materials in non-ferrous smelting, which is used for dearsenic and sulfur-removing treatment of arsenic sulfide-containing arsenic sulfide slag, and for dearsenic treatment of smelting dust or oxidized metal ore powder, It is characterized in that it includes:

In step A, the arsenic sulfide slag and the smelting dust or the oxidized metal ore powder are input into the raw material mixer for mixing, and the pyrolysis raw materials are output, wherein the smelting dust is volatile in the non-ferrous metal smelting process. The element is carried away with the flue gas and is produced by the product after dust collection and condensation, and the oxidized metal ore powder is the raw ore mining material or the intermediate product of the beneficiation process;

Step B, the pyrolysis raw material output in the step A is transported to a low temperature pyrolysis furnace;

Step C, continuously input the inert gas for forming an oxygen-free atmosphere into the low-temperature pyrolysis furnace in the step B;

In step D, the low-temperature pyrolysis furnace in the step B is heated and pyrolyzed at a first set temperature, and maintained at a first set time period, so that the sulfur in the arsenic sulfide forms a solid metal sulfide, Arsenic in arsenic sulfide forms gaseous arsenic trioxide, and respectively outputs pyrolysis material containing metal sulfide and low-temperature pyrolysis gas containing arsenic trioxide;

Step E, the carbon powder for decomposing the arsenate and the pyrolysis material output in the step D are input into the high temperature pyrolysis furnace;

Step F, continuously inputting the inert gas for forming an oxygen-free atmosphere into the high temperature pyrolysis furnace in the step E; and,

In step G, the high-temperature pyrolysis furnace in the step E is heated and pyrolyzed according to the second set temperature, and the heat preservation is carried out according to the second set time period, so that the smelting smoke or the oxidized metal ore powder is The solid arsenic trioxide in the gas becomes gaseous, and the arsenate is decomposed, and the pyrolysis tailings containing metal sulfide and the high-temperature pyrolysis gas containing arsenic trioxide are output.

In the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting according to the present invention, in step D, the first set temperature is set to 200-400°C, and the first set duration is set to 60 ~180min.

In the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting according to the present invention, in step G, the second set temperature is set to 500-700°C, and the second set duration is set to 60 ~180min.

In the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting of the present invention, the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting further includes step H before step A, inputting the arsenic sulfide slag into a In the crusher, it is crushed into particles with a particle size of 1mm-30mm and output.

In the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting according to the present invention, the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting further comprises: step I, firstly, the low-temperature pyrolysis output in step D is performed. The gas and the high temperature pyrolysis gas output from the step G are input into the high temperature gas-solid separation tower, so that the arsenic trioxide in the low temperature pyrolysis gas and the high temperature pyrolysis gas remains gaseous, and the low temperature heat is filtered out. The decomposed gas and the dust in the high-temperature pyrolysis gas form a filtered pyrolysis gas, and then the filtered pyrolysis gas is input into the condensation arsenic collection device, which is condensed to collect arsenic, and the refined white arsenic is output.

In the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting of the present invention, the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting further comprises step J, wherein the low-temperature pyrolysis gas output in step D is firstly processed and the high-temperature pyrolysis gas output from the step G is input into the high-temperature gas-solid separation tower, so that the low-temperature pyrolysis gas and the arsenic trioxide in the high-temperature pyrolysis gas remain gaseous, and the low-temperature pyrolysis gas is filtered out. The gas and the dust in the high-temperature pyrolysis gas form a filtered pyrolysis gas, and then the filtered pyrolysis gas is input into the reduction tower for carbon reduction to output metal arsenic.

In the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting according to the present invention, the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting further comprises step K, firstly disposing the low-temperature pyrolysis gas output in step D and the high-temperature pyrolysis gas output from the step G is input into the high-temperature gas-solid separation tower, so that the low-temperature pyrolysis gas and the arsenic trioxide in the high-temperature pyrolysis gas remain gaseous, and the low-temperature pyrolysis gas is filtered out. gas and the dust in the high-temperature pyrolysis gas, and then a part of the filtered low-temperature pyrolysis gas and the high-temperature pyrolysis gas are input into the condensation arsenic collection device, which is condensed to collect arsenic, and the refined white arsenic is output, And another part of the filtered low-temperature pyrolysis gas and the high-temperature pyrolysis gas is input into the reduction tower, carbon reduction is performed on them, and metal arsenic is output.

In the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting according to the present invention, in step D, the pyrolysis raw materials in the low-temperature pyrolysis furnace are heated and pyrolyzed by external flue gas, and in step G In step K, the pyrolysis material in the high-temperature pyrolysis furnace is heated and pyrolyzed by external flue gas, and the low-temperature pyrolysis gas and high temperature in the high-temperature gas-solid separation tower are set in step K by external flue gas. The pyrolysis gas is filtered at high temperature, and the external flue gas used in the step D is set as a mixed gas of the external flue gas used in the step G and the external flue gas used in the step K.

Compared with the prior art, the present invention has the following beneficial effects: the method for the collaborative treatment and utilization of arsenic-containing materials in non-ferrous smelting of the present invention continuously inputs nitrogen into the low-temperature inner barrel, so that the low-temperature inner barrel is infinitely close to an oxygen-free atmosphere, and has It is beneficial to inhibit the arsenic sulfide in the arsenic sulfide slag from reacting with oxygen to generate sulfur dioxide, preventing environmental pollution and increasing treatment costs. The arsenic sulfide in the arsenic sulfide slag reacts with the oxidized metal in the smelting dust or oxidized metal ore powder to generate solid metal sulfide and gaseous arsenic trioxide. Continuously input nitrogen into the high-temperature inner cylinder, so that the high-temperature inner cylinder is infinitely close to an oxygen-free atmosphere, which can effectively prevent arsenic trioxide from reacting with oxidized metal and oxygen to form arsenate. The carbon powder is input into the high temperature inner cylinder, which can decompose the possible arsenate and effectively ensure the complete removal of arsenic. The method for synergistic treatment and utilization of arsenic-containing materials in non-ferrous smelting of the present invention can synergistically process multiple materials to remove arsenic and solidify sulfur, and the valuable metals in the reactants can be increased in value by vulcanization, and the sulfur in them is retained, which is beneficial to Subsequent fire smelting; compared with traditional furnace types such as fluidized bed, blast furnace, and reverberatory furnace, its flue gas volume is extremely small, sulfur loss is small, and secondary pollution is low; it has strong adaptability and can be adjusted according to different non-ferrous metal smelting products. The process parameters and material addition ratio have good results, the process flow is simple, and it can be industrialized and processed on a large scale.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings used in the embodiments, and the accompanying drawings in the following description are only corresponding to some embodiments of the present invention. 's attached drawing.

Fig. 1 is a structural block diagram of the non-ferrous smelting arsenic-containing material co-processing and utilization equipment of the present invention.

Fig. 2 is a partial flow chart of the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting of the present invention.

FIG. 3 is another part of the flow chart of the method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting of the present invention.

in,

Figure 1 is marked as follows:

11. Low temperature sulfur fixing device,

111. Crusher, 112, Raw material mixer, 113, Raw material feeding mechanism, 114, Low temperature pyrolysis furnace, 115, Nitrogen generator,

12. High temperature pyrolysis device,

121, pyrolysis material feeding mechanism, 122, high temperature pyrolysis furnace, 123, pyrolysis material discharging mechanism, 124, additive feeding mechanism,

13. Arsenic collection device,

131. High-temperature gas-solid separation tower, 132. Condensing and collecting arsenic device, 133. Reduction tower,

14. Heating device,

141. Flue gas main pipe, 142. Combustion mechanism.

15. Exhaust gas purification system.

In the figures, structurally similar elements are denoted by the same reference numerals.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Directional terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "side", "top" Words such as "bottom" and the like refer only to the orientation of the drawings, and the directional terms used are used to describe and understand the present invention, rather than to limit the present invention.

Words such as "first" and "second" in the terminology of the present invention are only for the purpose of description, and should not be construed as indicating or implying relative importance, nor as a limitation on the sequence.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The purpose of co-processing sulfur-containing arsenic materials and arsenic-containing metal oxides in the prior art is to remove arsenic, and the main process is pyrotechnic, which cannot avoid the loss of sulfur, and the effect of removing arsenic is not good, and the environment is seriously polluted. There is a great potential safety hazard in industrial production, which is not conducive to the secondary resource utilization of the treated tailings.

The following is a preferred embodiment of a non-ferrous smelting arsenic-containing material co-processing and utilization equipment and a method for non-ferrous smelting arsenic-containing material co-processing and utilization provided by the present invention that can solve the above technical problems.

Please refer to FIG. 1 , the present invention provides a non-ferrous smelting arsenic-containing material co-processing and utilization equipment for removing arsenic and sulfur-fixing operation. Arsenic collection device 13 , heating device 14 and exhaust gas purification system 15 .

Wherein, the low temperature sulfur fixing device 11 includes a crusher 111 , a raw material mixer 112 , a raw material feeding mechanism 113 , a low temperature pyrolysis furnace 114 and a nitrogen generator 115 .

The crusher 111 is used for crushing the arsenic sulfide slag into particles with a particle size of 1mm-30mm. The raw material mixer 112 is connected to the crusher 111, and is used for mixing the arsenic sulfide slag with smelting dust or oxidized metal ore powder. The raw material feeding mechanism 113 is connected to the raw material mixer 112 for receiving and conveying the pyrolysis raw material output by the raw material mixer 112 .

The low temperature pyrolysis furnace 114 includes a low temperature inner cylinder, a low temperature jacket and a low temperature stirring mechanism. The low temperature inner cylinder is used for accommodating the pyrolysis raw material output by the raw material feeding mechanism 113, and the low temperature inner cylinder is provided with a low temperature pyrolysis feed port, a low temperature pyrolysis material outlet and a low temperature pyrolysis gas outlet. The low-temperature pyrolysis feed port is connected to the raw material feeding mechanism 113 for receiving the pyrolysis raw material output by the raw material feeding mechanism 113, and the low-temperature pyrolysis discharge port is used for outputting the pyrolysis material containing metal sulfide, and the low-temperature pyrolysis output is The gas port is used to output low-temperature pyrolysis gas containing arsenic trioxide. The low temperature jacket is wrapped on the outside of the low temperature inner cylinder, and is used to heat and pyrolyze the pyrolysis raw materials in the low temperature inner cylinder by inputting external flue gas. The low temperature stirring mechanism is arranged in the low temperature inner cylinder, and is used for stirring the pyrolysis raw materials in the low temperature inner cylinder.

The nitrogen generator 115 is connected with the raw material feeding mechanism 113 and the low temperature inner cylinder, and is used for inputting nitrogen gas into the raw material feeding mechanism 113 and the low temperature inner cylinder to form an oxygen-free atmosphere.

The high temperature pyrolysis device 12 includes a pyrolysis material feeding mechanism 121 , a high temperature pyrolysis furnace 122 , an additive feeding mechanism 124 and a pyrolysis material discharging mechanism 123 .

The inside of the pyrolysis material feeding mechanism 121 is provided with a spiral structure, and the pyrolysis material feeding mechanism 121 is connected with the low temperature pyrolysis outlet for conveying the pyrolysis material output from the low temperature pyrolysis outlet. The pyrolysis material feeding mechanism 121 is also connected to the nitrogen generator 115 for inputting nitrogen gas into the pyrolysis material feeding mechanism 121 to form an oxygen-free atmosphere.

The high temperature pyrolysis furnace 122 includes a high temperature inner cylinder, a high temperature jacket and a high temperature stirring mechanism. The high-temperature inner cylinder is used for accommodating the pyrolysis material output by the pyrolysis material feeding mechanism 121, and the high-temperature inner cylinder is connected with the nitrogen generator 115 for inputting nitrogen gas into the high-temperature inner cylinder to form an oxygen-free atmosphere. The high temperature inner cylinder includes a high temperature pyrolysis feed port, a high temperature pyrolysis discharge port and a high temperature pyrolysis gas outlet. The high temperature pyrolysis feed port is connected to the pyrolysis material feeding mechanism 121 for inputting the pyrolysis material feeding mechanism 121 The output pyrolysis material, the high temperature pyrolysis outlet is used to output the pyrolysis tailings containing metal sulfide, and the high temperature pyrolysis gas outlet is used to output the high temperature pyrolysis gas containing arsenic trioxide. The high temperature jacket is wrapped on the outside of the high temperature inner cylinder, and is used to heat and pyrolyze the pyrolysis raw materials in the high temperature inner cylinder by inputting external flue gas. The high-temperature stirring mechanism is arranged in the high-temperature inner cylinder, and is used for stirring the pyrolysis material in the high-temperature inner cylinder.

The additive feeding mechanism 124 is provided with a spiral structure inside. The additive feeding mechanism 124 is connected to the high temperature inner cylinder and is used to input carbon powder into the high temperature inner cylinder, so that the arsenate in the high temperature inner cylinder is decomposed. The additive feeding mechanism 124 is also connected with the nitrogen generator 115 for inputting nitrogen into the additive feeding mechanism 124 to form an oxygen-free atmosphere.

The inside of the pyrolysis material discharge mechanism 123 is provided with a spiral structure, and the pyrolysis material discharge mechanism 123 is connected to the high temperature pyrolysis discharge port for outputting pyrolysis tailings containing metal sulfide.

Among them, the arsenic collection device 13 includes a high temperature gas-solid separation tower 131 , a condensation arsenic collection device 132 , and a reduction tower 133 .

The high temperature gas-solid separation tower 131 is used to filter the low temperature pyrolysis gas output from the low temperature pyrolysis gas outlet and the high temperature pyrolysis gas output from the high temperature pyrolysis gas outlet to obtain filtered pyrolysis gas. The high temperature gas-solid separation tower 131 includes a separation tower inner furnace and a separation tower jacket, the separation tower inner furnace includes a separation tower gas inlet and a separation tower gas outlet, and the separation tower gas inlet is connected to both the low temperature pyrolysis gas outlet and the high temperature pyrolysis gas outlet , the gas inlet of the separation tower is used to input low temperature pyrolysis gas and high temperature pyrolysis gas, and the gas outlet of the separation tower is used to output filtered pyrolysis gas. The furnace in the separation tower is divided into an upper filter cavity and a lower ash discharge cavity, the ash discharge cavity is conical, and the bottom is provided with an ash discharge port. The furnace in the separation tower also includes a support plate, a plurality of filter membrane tubes and a backflushing tube, and the support plate is fixed in the filter cavity along the radial direction of the filter cavity. The support plate divides the filter cavity into two parts, the part far from the ash discharge cavity is the upper cavity, and the part close to the ash discharge cavity is the lower cavity, and the capacity of the upper cavity is smaller than that of the lower cavity. The gas inlet of the separation tower and the gas outlet of the separation tower are respectively located on opposite sides of the lower cavity, and the gas outlet of the separation tower is higher than the gas inlet of the separation tower. A plurality of filter membrane tubes are fixed in the filter cavity along the axial direction of the filter cavity, and the filter membrane tubes are penetrated and fixed on the support plate. One end of the backflushing pipe is located outside the high-temperature gas-solid separation tower 131, and the other end is located in the upper cavity. One end of the backflushing pipe located in the upper cavity is provided with a plurality of backflushing ports, and the plurality of backflushing ports are respectively connected with a plurality of filter membrane tubes correspondingly. The blowback pipe is used to discharge the dust in the filter membrane pipe from the ash discharge port. The separation tower jacket is wrapped around the peripheral side of the furnace in the separation tower. The separation tower jacket is used to input high temperature flue gas to heat the low temperature pyrolysis gas and high temperature pyrolysis gas in the furnace in the separation tower, and the outlet of the separation tower jacket And the outlet of the high temperature jacket is connected with the inlet of the low temperature inner cylinder.

The condensing and collecting arsenic device 132 is connected to the gas outlet of the separation tower, and is used for condensing and collecting arsenic on the filtered pyrolysis gas to obtain refined white arsenic.

The reduction tower 133 is connected to the gas outlet of the separation tower, and is used for carbon reduction of the filtered pyrolysis gas to obtain metal arsenic.

Wherein, the tail gas purification system 15 is set as an alkaline washing tower, and the tail gas purification system 15 is connected with the condensation arsenic collection device 132 and the reduction tower 133, and is used to pass the pyrolysis tail gas discharged from the condensation arsenic collection device 132 and the reduction tower 133 through sodium hydroxide. The solution is disposed of harmlessly.

The heating device 14 includes a flue gas main pipe 141 and a combustion mechanism 142 . The flue gas main pipe 141 is used for conveying high temperature flue gas, and the outlet of the flue gas main pipe 141 is connected to the inlet of the high temperature jacket and the inlet of the separation tower jacket. The combustion mechanism 142 is used to generate high temperature flue gas, and the combustion mechanism 142 is connected to the inlet of the flue gas main pipe 141 .

The non-ferrous smelting arsenic-containing material co-processing and utilization equipment of the invention can mix and co-process a variety of arsenic-containing materials, and realize the secondary utilization of resources while reducing environmental pollution.

Please refer to FIG. 2 and FIG. 3 , the present invention also provides a method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting, which is used for arsenic sulfide-containing arsenic sulfide-containing arsenic sulfide slag desulfurization and sulfur-removal treatment. The solid content in the arsenic sulfide slag is as The mass percentage contains As is 25-50%, S is 20-40%, and is used for arsenic removal treatment of smelting smoke or oxidized metal ore powder. Among them, the smelting fume is the fume produced by the volatile elements carried away with the flue gas and condensed by the dust collection during the non-ferrous metal smelting process. 30%, ZnO is 2-30%, As ₂ O ₃ is 10-30%. _Oxidized metal ore powder is the raw ore mining material or the intermediate product _of the beneficiation process. The mass percentage of CuO is 15-30%, and As ₂ O ₃ is 1-15%. The method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting uses the above-mentioned equipment for co-processing and utilization of arsenic-containing materials in non-ferrous smelting to carry out arsenic-removing and sulfur-fixing operations. The method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting includes the following steps.

In step A, the arsenic sulfide slag is input into the crusher 111, crushed into particles with a particle size of 1mm-30mm and output.

In step B, the arsenic sulfide slag output in step A and the smelting dust or oxidized metal ore powder are input into the raw material mixer 112 for mixing, and the pyrolysis raw material is output.

In step C, the pyrolysis raw material output in step B is transported into the preheated low-temperature inner cylinder through the raw material feeding mechanism 113, and the nitrogen gas for forming an oxygen-free atmosphere is continuously input into the raw material feeding mechanism 113 through the nitrogen generator 115. .

In step D, nitrogen gas for forming an oxygen-free atmosphere is continuously input into the low-temperature inner cylinder in step C through the nitrogen generator 115 .

In step E, the pyrolysis raw materials in the low-temperature inner cylinder in step C are stirred by a low-temperature stirring mechanism, and the external flue gas in the low-temperature jacket is heated and pyrolyzed at a first set temperature for a first set duration. Insulation, wherein the first set temperature is set to 200-400°C, and the first set time is set to 60-180min, so that the sulfur in the arsenic sulfide forms solid metal sulfide, and the arsenic in the arsenic sulfide forms gaseous arsenic trioxide, respectively output containing Pyrolysis material of metal sulfide and low temperature pyrolysis gas containing arsenic trioxide.

In step F, the carbon powder for decomposing arsenate is input into the preheated high temperature inner cylinder through the additive feeding mechanism 124, and the pyrolysis material output in step E is input into the high temperature through the pyrolysis material feeding mechanism 121. The nitrogen gas for forming an oxygen-free atmosphere is continuously fed through the nitrogen generator 115 to the additive feeding mechanism 124 and the pyrolysis material feeding mechanism 121 .

In step G, nitrogen gas for forming an oxygen-free atmosphere is continuously input into the high-temperature inner cylinder in step F through the nitrogen generator 115 .

In step H, the pyrolysis material in the high-temperature inner cylinder in step F is stirred by the high-temperature stirring mechanism, and the external flue gas in the high-temperature jacket is heated and pyrolyzed at the second set temperature, and the second set duration is carried out. Insulation, wherein the second set temperature is set to 500-700°C, and the second set time is set to 60-180min, so that the solid arsenic trioxide in the smelting dust or oxidized metal ore powder becomes gaseous, and the arsenic acid that may be generated The arsenate that may exist in the salt or the pyrolysis material is decomposed, and the pyrolysis tailings containing metal sulfide and the high temperature pyrolysis gas containing arsenic trioxide are output through the pyrolysis material discharging mechanism 123 .

In step 1, the low-temperature pyrolysis gas output in step E and the high-temperature pyrolysis gas output in step H are input into the furnace in the separation tower, and the external flue gas in the separation tower jacket is subjected to high-temperature filtration, so that the low-temperature pyrolysis gas is filtered. The arsenic trioxide in the gas and the high-temperature pyrolysis gas remains gaseous, and the dust in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas is filtered to form a filtered pyrolysis gas, and then the filtered pyrolysis gas is input into the condensation arsenic collection device 132, and the Condensing and collecting arsenic, and outputting refined white arsenic and pyrolysis tail gas respectively, and/or inputting part of the filtered pyrolysis gas into reduction tower 133 for carbon reduction, respectively outputting metal arsenic and pyrolysis tail gas.

In step J, the external flue gas output from the high temperature jacket in step H and the external flue gas output from the separation tower jacket in step I are mixed and then input into the low temperature jacket in step E.

In step K, the pyrolysis tail gas output in step I is subjected to harmless treatment through the tail gas purification system 15, and is discharged up to the standard.

In the method in the above step A, the arsenic sulfide slag is input into the crusher 111, and crushed into particles with a particle size of 1mm-30mm, which is conducive to the sufficient reaction between the arsenic sulfide slag and the smelting smoke or oxidized metal ore powder in the subsequent steps, and improves the performance of the slag. Pyrolysis quality and efficiency.

In the method in the above step B, the arsenic sulfide slag output in step A and the smelting dust or oxidized metal ore powder are input into the raw material mixer 112 for mixing, which is beneficial to the subsequent steps to fully pyrolyze the arsenic sulfide slag and improve the pyrolysis quality. and efficiency.

In the methods of the above steps C, D and E, nitrogen is continuously input into the raw material feeding mechanism 113 and the low temperature inner cylinder, so that the low temperature inner cylinder is infinitely close to an oxygen-free atmosphere, which is beneficial to suppress the generation of arsenic sulfide and oxygen in the arsenic sulfide slag. The reaction generates sulfur dioxide, which can not only fix sulfur, but also prevent environmental pollution and increase treatment costs.

In the method of step E, the arsenic sulfide in the arsenic sulfide slag reacts with the oxidized metal in the smelting dust or oxidized metal ore powder to generate solid metal sulfide and gaseous arsenic trioxide. The reaction formula is 3CuO+As ₂ S ₃ =As ₂ O ₃ (g)+3CuS, 3PbO+As ₂ S ₃ =As ₂ O ₃ (g)+3PbS, which can make the sulfur in arsenic sulfide as solid metal sulfide The form of arsenic sulfide is retained, and the arsenic in arsenic sulfide can form gaseous arsenic trioxide, so that the arsenic sulfide slag can be removed from arsenic and solidified with sulfur. It should be noted that the above only lists the chemical reaction formula of arsenic sulfide and partially oxidized metals, and the reactions of arsenic sulfide and other oxidized metals all have the same effect, and will not be listed one by one here.

In the method of the above step E, the first set temperature is set to 200-400°C, which can not only improve the quality and efficiency of pyrolysis, but also save energy. The experimental data proves that when the first set temperature is less than 200°C, the arsenic sulfide in the arsenic sulfide slag does not react sufficiently with the smelting dust or the oxidized metal in the oxidized metal ore powder. When the first set temperature is greater than 400°C, the energy consumption is relatively large.

In the method of the above step E, when the first set temperature is set to 200-300°C, the first set duration is set to 120-180min at the same time, and the modified method can effectively save energy. When the first set temperature is set to 300-400°C, and the first set duration is set to 60-120min at the same time, the method can effectively save the pyrolysis time.

In the above-mentioned pyrolysis process of step E and step H, arsenic trioxide may react with oxide metal to form arsenate, and its chemical reaction formula is, As ₂ O ₃ +3CuO+O ₂ (g)=Cu ₃ (AsO ₄ ) ₂ , As ₂ O ₃ +3PbO+O ₂ (g)=Pb ₃ (AsO ₄ ) ₂ , 1.667As ₂ O ₃ (g)+3CuO=Cu ₃ (AsO ₄ )2+1.333As, 1.667As ₂ O ₃ (g)+3PbO ₌ Pb3( _AsO4 ) ₂ +1.333As. In the above-mentioned methods of step F, step G and step H, nitrogen is continuously input into the additive feeding mechanism 124, the pyrolysis material feeding mechanism 121 and the high-temperature inner cylinder, so that the high-temperature inner cylinder is infinitely close to the oxygen-free atmosphere, and the oxygen-free atmosphere is relative to the oxygen-free atmosphere. The aerobic atmosphere can effectively prevent arsenic trioxide from reacting with oxidized metals and oxygen to form arsenate. At the same time, there may also be arsenate in the pyrolysis raw material. The carbon powder is input into the high temperature inner cylinder to decompose the arsenate and effectively ensure the complete removal of arsenic. Its chemical reaction formula is, 2Cu ₃ (AsO ₄ ) ₂ +8C=As ₄ (g)+6Cu+8CO ₂ (g), 2Pb ₃ (AsO ₄ ) ₂ +8C=As ₄ (g)+6Pb+8CO ₂ (g). It should be noted that the above only lists the chemical reaction formula of arsenic trioxide and some oxidized metals, and also only lists the chemical reaction formula of some arsenate and carbon, and the chemical reaction of arsenic trioxide and other oxidized metals, and other arsenate and carbon. All have the same effect, and will not be listed one by one here.

In the method of the above-mentioned step H, experiments have proved that if the second set temperature is lower than 500 ° C, it is not conducive to the sublimation of solid arsenic trioxide in the smelting dust or oxidized metal ore powder to gaseous state, and if the second set temperature exceeds 750 ° C, Arsenic trioxide will react with carbon to generate arsenic, and arsenic will be mixed with pyrolysis tailings, which increases the difficulty of arsenic recovery and reduces the collection efficiency of arsenic. In step H, the second set temperature is set to 500-700°C, which can not only improve the quality and efficiency of pyrolysis, but also will not generate arsenic, and the arsenic will be transported and processed centrally in the form of gaseous arsenic trioxide, which improves the collection efficiency of arsenic, Reduced the difficulty of collecting arsenic.

In the method of the above step H, the second preset temperature is set to 500-600°C, and the second preset time period is set to 120-180min. The modified method can effectively save energy. The second set temperature is set to 600-700°C, and the second set time is set to 60-120min, and the modified method can effectively save the pyrolysis time.

In the above-mentioned pyrolysis process of step E and step H, stirring is performed by a low-temperature stirring mechanism and a high-temperature stirring mechanism, which can make the pyrolysis more sufficient, and improve the pyrolysis effect and pyrolysis quality.

In the method of above-mentioned step 1, both can condense to obtain refined white arsenic, and can obtain metal arsenic by carbon reduction, and effectively utilize waste gas. The chemical reaction formula of carbon reduction is 2As ₂ O ₃ +3C=4As+3CO ₂ . Before condensation and carbon reduction, a high-temperature filtration method is used to keep the arsenic trioxide in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas in a gaseous state, and filter out the dust in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas to form a filtered pyrolysis gas. It can not only effectively improve the precision of subsequent refined white arsenic and metal arsenic, but also prevent the condensation of gaseous arsenic trioxide to form glass arsenic to block the pipeline.

In the method of the above step J, the external flue gas output from the separation tower jacket and the high temperature jacket is input into the low temperature jacket as a heat source, thereby realizing multiple utilization of thermal energy.

When smelting dust or oxidized metal ore powder contains copper oxide, under the high temperature condition in step H, a small amount of copper sulfide will be decomposed into cuprous sulfide and elemental sulfur, so a small amount of sulfur will be lost in the form of gaseous state. In the above step B, the smelting dust or the oxidized metal ore powder is set as the metal ore powder containing only lead oxide, and in the step H, the generation of elemental sulfur and loss can be avoided, and the recovery rate of sulfur can be further improved.

The following is an example of using the above-mentioned non-ferrous smelting arsenic-containing materials co-processing and utilization equipment and non-ferrous smelting arsenic-containing materials co-processing and utilization methods.

Example 1

A method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting. Arsenic sulfide slag and smelting smoke come from a smelting company in Yunnan. The arsenic sulfide slag contains 25% of S and 38% of As by mass percentage.

The raw materials are put into the preheated low-temperature pyrolysis furnace 114 through the closed raw material feeding mechanism, heated to 400° C., and kept for 90 minutes, and nitrogen gas is introduced into the low-temperature pyrolysis furnace 114 at the same time, and the sulfur in the material is in the form of metal sulfide. The form remains in the material, and the arsenic enters the high temperature gas-solid separation tower 131 in the form of gaseous arsenic trioxide;

The solid sulfur material is directly sent to the preheated external heat type high-temperature pyrolysis furnace 122, heated to 600 ° C, and kept for 90 minutes. , feeding nitrogen gas and adding carbon powder into the high temperature pyrolysis furnace 122 is beneficial to reduce the generation of arsenate, and at the same time, increase the escape of gaseous arsenic trioxide;

Store the obtained pyrolysis tailings directly;

The clean arsenic-containing gas from the high-temperature gas-solid separation tower 131 enters the condensation arsenic collection device 132 to prepare refined white arsenic;

The pyrolysis tail gas discharged from the condensation arsenic collection device 132 is passed into the sodium hydroxide solution, and the obtained waste liquid is discharged up to the standard after being harmlessly treated.

Example 2

A method for co-processing and utilization of arsenic-containing materials in non-ferrous smelting. Arsenic sulfide slag and smelting smoke come from a smelting company in Yunnan. The arsenic sulfide slag contains 20% of S and 33% of As in the arsenic sulfide slag.

The raw material is put into the preheated low-temperature pyrolysis furnace 114 through the closed raw material feeding mechanism, heated to 300 ° C, and kept for 60 minutes, and nitrogen is introduced into the low-temperature pyrolysis furnace 114 at the same time, and the sulfur in the material is in the form of metal sulfide. The form remains in the material, and the arsenic enters the high temperature gas-solid separation tower 131 in the form of gaseous arsenic trioxide;

The solid sulfur material is directly sent to the preheated external heat type high temperature pyrolysis furnace 122, heated to 700 ° C, and kept for 60 minutes, and the original solid arsenic trioxide in the material is heated and enters the high temperature gas-solid separation tower 131 in the form of gas , the introduction of nitrogen into the furnace and the addition of carbon powder are beneficial to reduce the production of arsenate, and at the same time, increase the escape of gaseous arsenic trioxide;

Directly store the obtained thermal decomposition material;

The clean arsenic-containing gas from the high-temperature gas-solid separation tower 131 enters the reduction tower 133 to prepare metal arsenic;

The pyrolysis tail gas discharged from the reduction tower 133 is passed into the sodium hydroxide solution, and the obtained waste liquid is discharged up to the standard after being harmlessly treated.

The method for synergistic treatment and utilization of arsenic-containing materials in non-ferrous smelting of the present invention can synergistically process multiple materials to remove arsenic and solidify sulfur, and the valuable metals in the reactants can be increased in value by vulcanization, and the sulfur in them is retained, which is beneficial to Subsequent fire smelting; compared with traditional furnace types such as fluidized bed, blast furnace, and reverberatory furnace, its flue gas volume is extremely small, sulfur loss is small, and secondary pollution is low; it has strong adaptability and can be adjusted according to different non-ferrous metal smelting products. The process parameters and material addition ratio have good results, the process flow is simple, and it can be industrialized and processed on a large scale.

In summary, although the present invention has been disclosed above with preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those of ordinary skill in the art can make various Therefore, the protection scope of the present invention is subject to the scope defined by the claims.

Claims (10)

1. A method for synergistic treatment and utilization of arsenic-containing materials in nonferrous smelting is used for arsenic-removing and sulfur-fixing treatment of arsenic sulfide slag containing arsenic sulfide, wherein the solid content of the arsenic sulfide slag contains 25-50% of As and 20-40% of S by mass percent, and the arsenic-removing treatment is used for dearsenifying smelting smoke dust or oxidized metal mineral powder, wherein the smelting smoke dust is generated by products obtained by carrying volatile elements along with smoke gas in the nonferrous smelting process and condensing the volatile elements through dust collection, the solid content of the smelting smoke dust contains 2-30% of CuO, 2-30% of PbO, 2-30% of ZnO and 2-30% of As by mass percent₂O₃10-30%, wherein the oxidized metal mineral powder is a raw ore mining material or an intermediate product in an ore dressing process, the oxidized metal mineral powder is lead oxide mineral powder or copper oxide mineral powder, and the solid components of the lead oxide mineral powder comprise 30-50% of PbO and 30-50% of As by mass₂O₃1-15 percent of CuO, 15-30 percent of As and the solid components of the copper oxide ore powder according to mass percent₂O₃1-15%, and is characterized in that nonferrous smelting arsenic-containing material cooperative treatment and utilization equipment is used for arsenic removal and sulfur fixation operation, wherein the nonferrous smelting arsenic-containing material cooperative treatment and utilization equipment comprises a low-temperature sulfur fixation device, a high-temperature pyrolysis device, an arsenic collection device, a heat supply device and a tail gas purification system;

wherein, the low temperature solid sulphur device includes:

the crusher is used for crushing the arsenic sulfide slag into particles with the particle size of 1mm-30 mm;

the raw material mixer is connected with the crusher and is used for mixing the arsenic sulfide slag with the smelting smoke dust or the oxidized metal mineral powder;

the raw material feeding mechanism is connected with the raw material mixing machine and is used for receiving and conveying the pyrolysis raw materials output by the raw material mixing machine;

the low-temperature pyrolysis furnace comprises a low-temperature inner cylinder, a low-temperature jacket and a low-temperature stirring mechanism, wherein the low-temperature inner cylinder is used for accommodating pyrolysis raw materials output by the raw material feeding mechanism, the low-temperature inner cylinder is provided with a low-temperature pyrolysis feed inlet, a low-temperature pyrolysis discharge outlet and a low-temperature pyrolysis gas outlet, the low-temperature pyrolysis feed inlet is connected with the raw material feeding mechanism and is used for receiving the pyrolysis raw materials output by the raw material feeding mechanism, the low-temperature pyrolysis discharge outlet is used for outputting pyrolysis materials containing metal sulfides, and the low-temperature pyrolysis gas outlet is used for outputting low-temperature pyrolysis gas containing arsenic trioxide; the low-temperature jacket is wrapped outside the low-temperature inner cylinder and used for heating and pyrolyzing pyrolysis raw materials in the low-temperature inner cylinder through inputting external flue gas; the low-temperature stirring mechanism is arranged in the low-temperature inner cylinder and is used for stirring pyrolysis raw materials in the low-temperature inner cylinder; and the number of the first and second groups,

the nitrogen making machine is connected with the raw material feeding mechanism and the low-temperature inner cylinder and is used for inputting nitrogen into the raw material feeding mechanism and the low-temperature inner cylinder to form an oxygen-free atmosphere;

wherein, the high-temperature pyrolysis device includes:

the pyrolysis material feeding mechanism is internally provided with a spiral structure, is connected with the low-temperature pyrolysis discharge port and is used for conveying pyrolysis materials output by the low-temperature pyrolysis discharge port; the pyrolysis material feeding mechanism is also connected with the nitrogen making machine and used for inputting nitrogen into the pyrolysis material feeding mechanism to form an oxygen-free atmosphere;

the high-temperature pyrolysis furnace comprises a high-temperature inner cylinder, a high-temperature jacket and a high-temperature stirring mechanism; the high-temperature inner cylinder is used for containing pyrolysis materials output by the pyrolysis material feeding mechanism, the high-temperature inner cylinder is connected with the nitrogen making machine and used for inputting nitrogen into the high-temperature inner cylinder to form an oxygen-free atmosphere, the high-temperature inner cylinder comprises a high-temperature pyrolysis feed port, a high-temperature pyrolysis discharge port and a high-temperature pyrolysis gas outlet, the high-temperature pyrolysis feed port is connected with the pyrolysis material feeding mechanism and used for inputting the pyrolysis materials output by the pyrolysis material feeding mechanism, the high-temperature pyrolysis discharge port is used for outputting pyrolysis tailings containing metal sulfides, and the high-temperature pyrolysis gas outlet is used for outputting high-temperature pyrolysis gas containing arsenic trioxide; the high-temperature jacket is wrapped outside the high-temperature inner cylinder and used for heating and pyrolyzing pyrolysis raw materials in the high-temperature inner cylinder through inputting external flue gas; the high-temperature stirring mechanism is arranged in the high-temperature inner barrel and is used for stirring pyrolysis materials in the high-temperature inner barrel;

the additive feeding mechanism is internally provided with a spiral structure and is connected with the high-temperature inner cylinder and used for inputting carbon powder into the high-temperature inner cylinder so as to decompose arsenate in the high-temperature inner cylinder; the additive feeding mechanism is also connected with the nitrogen making machine and used for inputting nitrogen into the additive feeding mechanism to form an oxygen-free atmosphere; and the number of the first and second groups,

the interior of the pyrolysis material discharging mechanism is provided with a spiral structure, and the pyrolysis material discharging mechanism is connected with the high-temperature pyrolysis discharging port and used for outputting pyrolysis tailings containing metal sulfides;

wherein, receive arsenic device includes:

the high-temperature gas-solid separation tower is used for filtering the low-temperature pyrolysis gas output by the low-temperature pyrolysis gas outlet and the high-temperature pyrolysis gas output by the high-temperature pyrolysis gas outlet to obtain filtered pyrolysis gas; the high-temperature gas-solid separation tower comprises a separation tower inner furnace and a separation tower jacket, the separation tower inner furnace comprises a separation tower gas inlet and a separation tower gas outlet, the separation tower gas inlet is connected with the low-temperature pyrolysis gas outlet and the high-temperature pyrolysis gas outlet, the separation tower gas inlet is used for inputting low-temperature pyrolysis gas and high-temperature pyrolysis gas, and the separation tower gas outlet is used for outputting filtered pyrolysis gas; the separation tower inner furnace is divided into an upper filtering cavity and a lower ash discharging cavity, the ash discharging cavity is conical, and an ash discharging port is formed in the bottom of the ash discharging cavity; the separation tower inner furnace further comprises a support plate, a plurality of filter membrane pipes and a back flushing pipe, wherein the support plate is radially fixed in the filter cavity body along the radial direction of the filter cavity body, the support plate divides the filter cavity body into two parts, the part far away from the ash discharge cavity body is an upper cavity body, the part close to the ash discharge cavity body is a lower cavity body, the capacity of the upper cavity body is smaller than that of the lower cavity body, the gas inlet and the gas outlet of the separation tower are respectively positioned at two opposite sides of the lower cavity body, the gas outlet of the separation tower is higher than the gas inlet of the separation tower, the filter membrane pipes are axially fixed in the filter cavity body along the axial direction of the filter cavity body, the filter membrane pipes are fixedly penetrated on the support plate, one end of the back flushing pipe is positioned outside the high-temperature gas-solid separation tower, and the other end of the back flushing pipe is positioned in the upper cavity body, the back flushing pipe is provided with a plurality of back flushing ports at one end of the upper cavity, the back flushing ports are respectively and correspondingly communicated with the filtering membrane pipes, and the back flushing pipe is used for discharging dust in the filtering membrane pipes from the dust discharging port; the separation tower jacket is wrapped on the periphery of the separation tower inner furnace, the separation tower jacket is used for inputting high-temperature flue gas and heating low-temperature pyrolysis gas and high-temperature pyrolysis gas in the separation tower inner furnace, and an outlet of the separation tower jacket and an outlet of the high-temperature jacket are both connected with an inlet of the low-temperature inner cylinder;

the condensation arsenic-collecting device is connected with the gas outlet of the separation tower and is used for condensing the filtered pyrolysis gas to collect arsenic to obtain refined white arsenic; and the number of the first and second groups,

the reduction tower is connected with the gas outlet of the separation tower and is used for carrying out carbon reduction on the filtered pyrolysis gas to obtain metal arsenic;

the tail gas purification system is arranged as an alkaline washing tower, is connected with the condensation arsenic-collecting device and the reduction tower and is used for carrying out harmless treatment on pyrolysis tail gas discharged by the condensation arsenic-collecting device and the reduction tower through a sodium hydroxide solution;

wherein, the heating device includes:

the outlet of the flue gas main pipe is connected with the inlet of the high-temperature jacket and the inlet of the separation tower jacket; and the number of the first and second groups,

the combustion mechanism is used for generating high-temperature flue gas and is connected with the inlet of the flue gas main pipe;

the method for the synergistic treatment and utilization of the nonferrous smelting arsenic-containing material comprises the following steps:

step A, inputting the arsenic sulfide slag into the crusher, crushing the arsenic sulfide slag into particles with the particle size of 1mm-30mm, and outputting the particles;

b, inputting the arsenic sulfide slag output in the step A and the smelting smoke dust or the oxidized metal mineral powder into the raw material mixer for mixing, and outputting a pyrolysis raw material;

step C, conveying the pyrolysis raw material output in the step B into the low-temperature inner cylinder through the raw material feeding mechanism, and continuously inputting nitrogen for forming an oxygen-free atmosphere into the raw material feeding mechanism through the nitrogen making machine;

step D, continuously inputting nitrogen for forming an oxygen-free atmosphere into the low-temperature inner cylinder in the step C through the nitrogen manufacturing machine;

step E, stirring the pyrolysis raw material in the low-temperature inner cylinder in the step C through the low-temperature stirring mechanism, performing heating pyrolysis on the pyrolysis raw material through external flue gas in the low-temperature jacket according to a first set temperature, and performing heat preservation according to a first set time length, wherein the first set temperature is set to be 200-400 ℃, and the first set time length is set to be 60-180 min, so that sulfur in arsenic sulfide forms solid metal sulfide, arsenic in arsenic sulfide forms gaseous arsenic trioxide, and pyrolysis materials containing the metal sulfide and low-temperature pyrolysis gas containing the arsenic trioxide are respectively output;

step F, inputting carbon powder for decomposing arsenate into the high-temperature inner cylinder through the additive feeding mechanism, inputting the pyrolysis material output in the step E into the high-temperature inner cylinder through the pyrolysis material feeding mechanism, and continuously inputting nitrogen for forming an oxygen-free atmosphere into the additive feeding mechanism and the pyrolysis material feeding mechanism through the nitrogen manufacturing machine;

step G, continuously inputting nitrogen for forming an oxygen-free atmosphere into the high-temperature inner cylinder in the step F through the nitrogen manufacturing machine;

step H, stirring the pyrolysis material in the high-temperature inner cylinder in the step F through the high-temperature stirring mechanism, performing heating pyrolysis according to a second set temperature through external smoke in the high-temperature jacket, and performing heat preservation according to a second set time length, wherein the second set temperature is set to be 500-700 ℃, the second set time length is set to be 60-180 min, so that solid arsenic trioxide in the smelting smoke dust or the oxidized metal mineral powder is changed into a gaseous state, arsenate is decomposed, and pyrolysis tailings containing metal sulfide and high-temperature pyrolysis gas containing arsenic trioxide are output through the pyrolysis material discharging mechanism;

step I, inputting the low-temperature pyrolysis gas output in the step E and the high-temperature pyrolysis gas output in the step H into the separation tower inner furnace, performing high-temperature filtration on the low-temperature pyrolysis gas and the high-temperature pyrolysis gas through external flue gas in a separation tower jacket to enable arsenic trioxide in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas to be kept in a gaseous state, filtering dust in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas to form filtered pyrolysis gas, inputting the filtered pyrolysis gas into a condensation arsenic-collecting device, performing condensation on the filtered pyrolysis gas to collect arsenic, and respectively outputting refined white arsenic and pyrolysis tail gas, and/or inputting part of the filtered pyrolysis gas into a reduction tower, performing carbon reduction on the filtered pyrolysis gas, and respectively outputting metal arsenic and pyrolysis tail gas;

step J, mixing the external flue gas output by the high-temperature jacket in the step H with the external flue gas output by the separation tower jacket in the step I, and inputting the mixture into the low-temperature jacket in the step E; and the number of the first and second groups,

and K, performing harmless treatment on the pyrolysis tail gas output by the step I through the tail gas purification system, and discharging the pyrolysis tail gas after reaching the standard.

2. A method for the synergistic treatment and utilization of arsenic-containing materials in nonferrous smelting is used for performing arsenic removal and sulfur fixation treatment on arsenic sulfide slag containing arsenic sulfide and performing arsenic removal treatment on smelting smoke dust or oxidized metal mineral powder, wherein the smelting smoke dust is generated by products obtained by taking volatile elements along with smoke gas in the nonferrous smelting process and performing dust collection and condensation on the volatile elements, and the oxidized metal mineral powder is an intermediate product in a raw ore mining material or a mineral processing process link, and is characterized by comprising the following steps of:

step A, inputting the arsenic sulfide slag and the smelting smoke dust or the oxidized metal mineral powder into a raw material mixer for mixing, and outputting a pyrolysis raw material;

step B, conveying the pyrolysis raw material output by the step A to a low-temperature pyrolysis furnace;

step C, continuously inputting inert gas for forming an oxygen-free atmosphere into the low-temperature pyrolysis furnace in the step B;

d, heating and pyrolyzing the low-temperature pyrolysis furnace in the step B according to a first set temperature, and preserving heat according to a first set time length to enable sulfur in the arsenic sulfide to form a solid metal sulfide and arsenic in the arsenic sulfide to form gaseous arsenic trioxide, and respectively outputting a pyrolysis material containing the metal sulfide and a low-temperature pyrolysis gas containing the arsenic trioxide;

e, inputting carbon powder for decomposing arsenate and the pyrolysis material output in the step D into a high-temperature pyrolysis furnace;

step F, continuously inputting inert gas for forming an oxygen-free atmosphere into the high-temperature pyrolysis furnace in the step E; and the number of the first and second groups,

and G, carrying out heating pyrolysis on the high-temperature pyrolysis furnace in the step E according to a second set temperature, and carrying out heat preservation according to a second set time length to change the solid arsenic trioxide in the smelting smoke dust or the oxidized metal mineral powder into a gaseous state, decompose arsenate, and output pyrolysis tailings containing metal sulfide and high-temperature pyrolysis gas containing arsenic trioxide.

3. The method for co-processing and utilizing the nonferrous smelting arsenic-containing material according to claim 2, wherein in the step D, the first set temperature is set to 200-400 ℃, and the first set time period is set to 60-180 min.

4. The method for co-processing and utilizing the nonferrous smelting arsenic-containing material according to claim 2, wherein in the step G, the second set temperature is set to 500-700 ℃, and the second set time period is set to 60-180 min.

5. The method for co-processing and utilizing nonferrous smelting arsenic-containing material according to claim 2, wherein the method for co-processing and utilizing nonferrous smelting arsenic-containing material further comprises a step H of inputting the arsenic sulfide slag into a crusher, crushing the arsenic sulfide slag into particles with the particle size of 1mm-30mm and outputting the particles before the step A.

6. The method of nonferrous smelting arsenic-containing material for co-processing and utilization according to claim 2, wherein the method of co-processing and utilization of nonferrous smelting arsenic-containing material further comprises: and step I, inputting the low-temperature pyrolysis gas output in the step D and the high-temperature pyrolysis gas output in the step G into a high-temperature gas-solid separation tower, keeping the arsenic trioxide in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas in a gas state, filtering dust in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas to form a filtered pyrolysis gas, inputting the filtered pyrolysis gas into a condensation arsenic collecting device, condensing the condensed pyrolysis gas to collect arsenic, and outputting refined white arsenic.

7. The method for the synergistic processing and utilization of the nonferrous smelting arsenic-containing material according to claim 2, wherein the method for the synergistic processing and utilization of the nonferrous smelting arsenic-containing material further comprises a step J of inputting the low-temperature pyrolysis gas output in the step D and the high-temperature pyrolysis gas output in the step G into a high-temperature gas-solid separation tower, keeping arsenic trioxide in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas in a gaseous state, filtering out dust in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas to form a filtered pyrolysis gas, and inputting the filtered pyrolysis gas into a reduction tower, performing carbon reduction on the filtered pyrolysis gas, and outputting metallic arsenic.

8. The method for the co-processing and utilizing of the nonferrous smelting arsenic-containing material according to claim 2, characterized in that the method for the synergistic treatment and utilization of the nonferrous smelting arsenic-containing material also comprises a step K of inputting the low-temperature pyrolysis gas output by the step D and the high-temperature pyrolysis gas output by the step G into a high-temperature gas-solid separation tower, so that the arsenic trioxide in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas keeps in a gaseous state, filtering out the low-temperature pyrolysis gas and the dust in the high-temperature pyrolysis gas, inputting a part of the filtered low-temperature pyrolysis gas and the filtered high-temperature pyrolysis gas into a condensation arsenic-collecting device, condensing the arsenic to collect arsenic, outputting refined white arsenic, inputting the other part of the filtered low-temperature pyrolysis gas and the filtered high-temperature pyrolysis gas into a reduction tower, performing carbon reduction on the gases, and outputting metal arsenic.

9. The method for the synergistic processing and utilization of the nonferrous smelting arsenic-containing material according to claim 8, wherein the step D is implemented by performing thermal pyrolysis on the pyrolysis raw material in the low-temperature pyrolysis furnace through external flue gas, the step G is implemented by performing thermal pyrolysis on the pyrolysis material in the high-temperature pyrolysis furnace through external flue gas, the step K is implemented by performing high-temperature filtration on the low-temperature pyrolysis gas and the high-temperature pyrolysis gas in the high-temperature gas-solid separation tower through external flue gas, and the external flue gas used in the step D is implemented as a mixed gas of the external flue gas used in the step G and the external flue gas used in the step K.

10. A method for synergistic treatment and utilization of arsenic-containing materials in nonferrous smelting is used for arsenic-removing and sulfur-fixing treatment of arsenic sulfide slag containing arsenic sulfide, wherein the solid content of the arsenic sulfide slag contains 25-50% of As and 20-40% of S by mass percent, and the arsenic-removing treatment is used for dearsenifying smelting smoke dust or oxidized metal mineral powder, wherein the smelting smoke dust is generated by products obtained by carrying volatile elements along with smoke gas in the nonferrous smelting process and condensing the volatile elements through dust collection, the solid content of the smelting smoke dust contains 2-30% of CuO, 2-30% of PbO, 2-30% of ZnO and 2-30% of As by mass percent₂O₃10E30 percent of the oxidized metal mineral powder, 30 to 50 percent of the solid components of the oxidized metal mineral powder and 30 to 50 percent of PbO and As in percentage by mass₂O₃1-15 percent of CuO, 15-30 percent of As and the solid components of copper oxide ore powder in percentage by mass₂O₃1-15%, characterized by comprising:

step A, inputting the arsenic sulfide slag into a crusher, crushing the arsenic sulfide slag into particles with the particle size of 1mm-30mm, and outputting the particles;

b, inputting the arsenic sulfide slag output in the step A and the smelting smoke dust or the oxidized metal mineral powder into a raw material mixer for mixing, and outputting a pyrolysis raw material;

step C, conveying the pyrolysis raw material output by the step B to a preheated low-temperature pyrolysis furnace;

d, continuously inputting inert gas for forming an oxygen-free atmosphere into the low-temperature pyrolysis furnace in the step C;

step E, stirring the pyrolysis raw materials in the low-temperature pyrolysis furnace in the step C, heating and pyrolyzing the pyrolysis raw materials through external flue gas at a first set temperature, and keeping the temperature for a first set time, wherein the first set temperature is set to be 200-400 ℃, the first set time is set to be 60-180 min, so that sulfur in arsenic sulfide forms solid metal sulfide, arsenic in arsenic sulfide forms gaseous arsenic trioxide, and pyrolysis materials containing the metal sulfide and low-temperature pyrolysis gas containing the arsenic trioxide are respectively output;

f, inputting carbon powder for decomposing arsenate and the pyrolysis material output in the step E into a preheated high-temperature pyrolysis furnace;

step G, continuously inputting inert gas for forming an oxygen-free atmosphere into the high-temperature pyrolysis furnace in the step F;

step H, stirring the pyrolysis material of the high-temperature pyrolysis furnace in the step F, performing heating pyrolysis according to a second set temperature through external smoke, and performing heat preservation according to a second set time length, wherein the second set temperature is set to be 500-700 ℃, and the second set time length is set to be 60-180 min, so that solid arsenic trioxide in the smelting smoke dust or the oxidized metal ore powder is changed into a gaseous state, arsenate is decomposed, and pyrolysis tailings containing metal sulfide and high-temperature pyrolysis gas containing arsenic trioxide are output;

step I, inputting the low-temperature pyrolysis gas output in the step E and the high-temperature pyrolysis gas output in the step H into a high-temperature gas-solid separation tower, heating and filtering the low-temperature pyrolysis gas and the high-temperature pyrolysis gas at high temperature through external flue gas to enable arsenic trioxide in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas to be kept in a gaseous state, filtering dust in the low-temperature pyrolysis gas and the high-temperature pyrolysis gas to form filtered pyrolysis gas, inputting the filtered pyrolysis gas into a condensation arsenic-collecting device, condensing the filtered pyrolysis gas to collect arsenic, and respectively outputting refined white arsenic and pyrolysis tail gas, and/or inputting part of the filtered pyrolysis gas into a reduction tower, performing carbon reduction on the filtered pyrolysis gas, and respectively outputting metal arsenic and pyrolysis tail gas;

step J, setting the external smoke used in the step E as a mixed gas of the external smoke used in the step I and the external smoke used in the step I; and the number of the first and second groups,

and K, performing harmless treatment on the pyrolysis tail gas output by the step I through a tail gas purification system, and discharging the pyrolysis tail gas up to the standard.

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