CN115751993B - Temperature regulation and treatment methods for furnace gas - Google Patents
Temperature regulation and treatment methods for furnace gasInfo
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- CN115751993B CN115751993B CN202211557966.6A CN202211557966A CN115751993B CN 115751993 B CN115751993 B CN 115751993B CN 202211557966 A CN202211557966 A CN 202211557966A CN 115751993 B CN115751993 B CN 115751993B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a temperature regulating method and a treatment method for furnace gas, which solve the technical problems of low purity of As 2O3 products and pipeline blockage in the prior art. The temperature regulation method of the tapping stove gas comprises the steps of obtaining first gas, obtaining second gas, obtaining third gas, obtaining the third gas after heating the first gas, adapting the temperature of the third gas to the target temperature of the tapping stove gas, obtaining the first gas after heating compressed air, obtaining the second gas after heating the first gas, obtaining the third gas after heating the third gas, obtaining the second gas with the temperature higher than the temperature of the third gas, keeping the temperature of a pipeline and a filter on a flow path before the gas in the tapping stove gas is sublimated or liquefied by adopting the third gas, and enabling the mixed mixture to flow on the flow path by controlling the mixing proportion of the first gas, the second gas and the tapping stove gas.
Description
Technical Field
The invention relates to the technical field of furnace gas discharge, in particular to the technical field of high-arsenic tin smoke dust furnace gas, and specifically relates to a temperature adjusting method and a treatment method of the furnace gas discharge.
Background
The existing main process for volatilizing and recycling As 2O3 products by using the direct current electric furnace for Gao Shenxi smoke dust is that metered high-arsenic tin smoke dust (slag), quartz sand and coke powder are mixed and then enter the direct current electric furnace through spiral feeding, most of oxidized arsenic is volatilized out in the form of arsenic gaseous oxides by controlling the negative pressure in the direct current electric furnace and the temperature in the direct current electric furnace, arsenic in the form of arsenate in the materials is subjected to thermal reduction by the coke powder to generate the volatile gaseous oxides of arsenic, the gaseous oxides of arsenic enter a gravity dust collector along with airflow, the arsenic gaseous oxides are settled and condensed to obtain As 2O3 products, the arsenic-containing furnace gas which is not settled continuously enters a bag dust collector, and the furnace gas which is dedusted by the bag dust collector enters a desulfurization working section for treatment and is emptied. Valuable metal tin is enriched in slag by controlling volatilization of tin in the process.
The main disadvantages of this process are:
(1) In the gravity dust collector and the cloth bag dust collector, a large amount of dust is adsorbed on the As 2O3 products, so that the purity of the As 2O3 only reaches 90-92% and the purity requirement of related products is not met, and the dust still contains more tin elements and has higher cost for subsequent purification.
(2) Because of the large temperature fluctuation of the discharged furnace gas, the furnace gas can be condensed and separated out before entering the gravity dust collector, and the pipeline is blocked.
Disclosure of Invention
The invention mainly aims to provide a temperature adjusting method and a treatment method of furnace gas and a treatment device and a treatment system of furnace gas, which are used for solving the technical problems of low purity of As 2O3 products and pipeline blockage in the prior art.
In order to achieve the above object, according to a first aspect of the present invention, there are provided the following two methods of regulating the temperature of the tapping gas.
The first temperature regulation method of the tapping stove gas comprises the steps of obtaining first gas, obtaining second gas, obtaining third gas, obtaining the third gas after heating the first gas, wherein the temperature of the third gas is matched with the target temperature of the tapping stove gas, the temperature of the second gas is higher than the temperature of the third gas, the temperature of the third gas is in a flow path before the gas in the tapping stove gas is subjected to the de-sublimation treatment or the liquefaction treatment, the pipeline and the filter in the third gas convection path are adopted for heat preservation, and the mixture flows on the flow path in proportion after the mixture of the first gas, the second gas and the tapping stove gas is controlled by controlling the temperature of the first gas, the second gas and the target temperature of the tapping stove gas.
The second temperature regulation method of the tapping stove gas comprises the steps of obtaining first gas after heating compressed air, obtaining second gas after heating the first gas, obtaining second gas after heating the second gas, obtaining third gas after heating the first gas, obtaining the third gas after heating the third gas, obtaining the third gas after the temperature is 350-450 ℃, the temperature of the third gas is matched with the target temperature of a filter element in a filter for recovering the dust, obtaining the first gas after heating compressed air, obtaining the second gas after heating the first gas, obtaining the second gas after heating the second gas, and mixing the first gas and the second gas after heating the third gas, and mixing the first gas with the second gas after heating the third gas, cooling the first gas, cooling the second gas, and keeping the temperature of the third gas, and mixing the first gas, the second gas, the third gas, the first gas, the third gas, and the third gas.
As a further improvement of the first aspect of the present invention, the target temperature and the temperature of the third gas are 350 to 400 ℃, the temperature of the first gas is 320 to 350 ℃, and the temperature of the second gas is 400 to 420 ℃.
As a further development of the first aspect of the invention, the filter element is back-blown with a first gas for cleaning the filter element.
As a further improvement of the first aspect of the invention, the tapping gas is generated by processing arsenic-tin smoke dust, quartz sand and coke powder by a direct current electric furnace, a rotary kiln or a converter.
As a further improvement of the first aspect of the present invention, a PLC control system is used to control the mixing ratio of the first gas, the second gas, and the off-gas so that the mixed mixture flows on the flow path at the target temperature.
In order to achieve the above object, according to a second aspect of the present invention, there is provided a method for treating a furnace gas discharged from a furnace, comprising:
A treatment method of the furnace outlet gas, wherein the furnace outlet gas is generated by treating arsenic tin smoke dust, quartz sand and coke powder by a direct current electric furnace, a rotary kiln or a converter, the furnace outlet gas contains dust and gaseous As 2O3, the furnace outlet temperature of the furnace outlet gas is 200-660 ℃, the treatment method comprises the following steps of adopting the temperature regulation method of the first aspect to regulate the temperature of the furnace outlet gas from the furnace outlet temperature to 350-450 ℃ and filtering the gas to be filtered to obtain first dust-free gas, performing desublimation treatment on the first dust-free gas to enable gaseous As 2O3 in the first dust-free gas to be condensed into solid As 2O3 to obtain desublimated gas containing solid As 2O3, and performing gas-solid separation treatment on the desublimated gas to obtain As 2O3 products and second dust-free gas.
As a further improvement of the second aspect of the invention, the desublimation treatment adopts gas-gas contact heat exchange, the cold source is normal-temperature compressed air, and the temperature of the obtained desublimation gas is 50-100 ℃.
As a further improvement of the second aspect of the invention, a portion of the solid As 2O3 is collected during the desublimation treatment.
As a further improvement of the second aspect of the invention, the method also comprises the step of desulfurizing the second dust-free gas, wherein the desulfurized gas is discharged through a chimney.
In order to achieve the above object, according to a third aspect of the present invention, there is provided a treatment apparatus for off-gas, comprising:
the treatment equipment for the furnace gas comprises a filter, an air inlet pipeline and an air outlet pipeline, wherein the air inlet pipeline and the air outlet pipeline are connected with the filter, a filtering element in the filter is a metal porous film, the temperature adjusting assembly is used for adjusting the temperature of the furnace gas from the furnace temperature to a target temperature, the target temperature is higher than the desublimation temperature or the liquefaction temperature and lower than the tolerance temperature limit value of the filtering element in the filter, the temperature adjusting assembly comprises a first-stage heating mechanism used for heating compressed air into first gas and enabling the first gas to be led into the air inlet pipeline, a second-stage heating mechanism used for heating the first gas into second gas and enabling the second gas to be led into the air inlet pipeline, a third-stage heating mechanism used for heating the first gas into third gas and enabling the third gas to keep the temperature of the filter, the air inlet pipeline and the air outlet pipeline, and a temperature detecting mechanism used for detecting the temperature of the air to be filtered and/or the temperature of the first dust-free gas in the air inlet pipeline.
As a further improvement of the third aspect of the invention, the primary heating mechanism comprises a primary heater, a first pipeline and a first valve, wherein the first pipeline is connected with the primary heater and the air inlet pipeline, the first valve is arranged on the first pipeline, the secondary heating mechanism comprises a secondary heater, a second pipeline and a second valve, the second pipeline is connected with the secondary heater and the air inlet pipeline, the second valve is arranged on the second pipeline, the tertiary heating mechanism comprises a jacket and a first fan, the jacket is arranged outside the filter, the air inlet pipeline and the air outlet pipeline, and the first fan pulls third gas to flow in the jacket.
As a further improvement of the third aspect of the present invention, the processing apparatus further includes a PLC control system that controls opening and closing of the first valve and the second valve in accordance with the detection value of the temperature detection mechanism.
As a further development of the third aspect of the invention, the air inlet duct is connected to an air outlet of a direct current electric furnace, rotary kiln or converter.
As a further improvement of the third aspect of the invention, the processing apparatus further comprises a blowback mechanism for blowback ash removal of the filter element, the blowback mechanism comprising a blowback pipe connected to the primary heating mechanism.
As a further development of the third aspect of the invention, the treatment device comprises two filters connected in parallel.
In order to achieve the above object, according to a fourth aspect of the present invention, there is provided a system for treating a furnace gas, comprising:
The treatment system for the furnace gas comprises the treatment equipment for the furnace gas, a first dust-free gas obtained by filtering the gas to be filtered, which is formed by mixing the first gas, the second gas and the furnace gas, through a filter, a condensing unit, a recovery unit and an As 2O3 product and a second dust-free gas obtained by performing gas-solid separation treatment on the sublimated gas, wherein the furnace gas contains dust and gaseous As 2O3, the furnace gas discharge temperature of the furnace gas is 200-660 ℃, the first dust-free gas and the compressed air are mixed in the condensing unit, and then the gaseous As 2O3 is condensed into solid As 2O3, so that the sublimated gas containing the solid As 2O3 is obtained.
As a further improvement of the fourth aspect of the invention, the treatment system further comprises a desulfurization unit for desulfurizing the second dust-free gas, and the treatment system further comprises a second fan and a chimney.
As a further development of the fourth aspect of the invention, the condensing unit comprises a gravity dust collector.
As a further development of the fourth aspect of the invention, the recovery unit comprises a cloth bag dust collector.
The invention has the following advantages through verification:
(1) The temperature of the discharged furnace gas is regulated by a temperature regulating method and treatment equipment, so that the discharged furnace gas is always kept at a target temperature before entering the gravity dust collector, as 2O3 is always in a gaseous form, and the pipeline is prevented from being blocked.
(2) The filter capable of bearing high temperature is adopted to filter the furnace gas discharged, so that the gaseous As 2O3 is separated from dust, the As 2O3 is condensed in a dust-free environment, and the purity of the As 2O3 is obviously improved.
(3) The dust intercepted by the high-temperature filter can further flow back to the furnace body for reaction, so that tin element and arsenic element in the dust are fully recovered, and the maximum utilization of resources is realized.
Therefore, the invention has simple structure and process, easy implementation and control and low cost, can be used by simply modifying the prior process and equipment, obviously improves the purity of the product, fully recovers tin element and arsenic element, can generate obvious economic benefit and has extremely strong practicability. It is obvious that the temperature regulation method, the treatment equipment and the treatment system of the invention are applicable to other scenes, especially the scenes in which the temperature of the furnace gas is required to be regulated, besides being applied to a system for treating high-arsenic tin smoke dust.
The invention is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part hereof, are shown by way of illustration and not of limitation, and in which are shown by way of illustration and description of the invention. In the drawings:
Fig. 1 is a schematic structural view of an embodiment of the treatment apparatus for tapping stove gas according to the present invention.
Fig. 2 is a schematic structural view of an embodiment of the treatment system for tapping stove gas according to the present invention.
The relevant marks in the drawings are as follows:
110-primary heater, 120-secondary heater, 130-tertiary heater, 131-first fan, 200-filter, 300-gravity dust collector, 400-cloth bag dust collector, 500-dynamic wave washing tower, 610-second fan, 620-chimney.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be noted in particular that:
The technical solutions and technical features provided in the sections including the following description in the present invention may be combined with each other without conflict.
In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
Terms and units in relation to the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of the invention and in the relevant sections are intended to cover a non-exclusive inclusion.
The method for regulating the temperature of the tapping gas according to the present invention is mainly but not exclusively suitable for treating the tapping gas containing dust and a desublimable or liquefiable gas, with the technical effect that the temperature of the tapping gas is regulated from the tapping temperature to a target temperature, which is higher than the desublimation temperature or the liquefiable temperature and lower than the tolerance temperature limit of the filter element in the filter 200 for recovering said dust, an embodiment comprising the steps of:
obtaining a first gas, wherein the first gas is obtained by heating compressed air;
Obtaining a second gas, wherein the second gas is obtained by heating the first gas;
obtaining third gas, wherein the third gas is obtained by heating first gas, and the temperature of the third gas is adapted to the target temperature of the furnace gas;
in the flow path before the desublimation treatment or the liquefaction treatment of the gas in the off-stream gas, the pipe on the third gas flow path and the filter 200 are used for heat preservation, and the mixed mixture flows on the flow path at the target temperature by controlling the mixing ratio of the first gas, the second gas and the off-stream gas.
When the furnace gas is a furnace gas obtained by treating high-arsenic tin dust by a direct-current electric furnace, such As a furnace gas generated by treating arsenic tin dust, quartz sand and coke powder by a direct-current electric furnace, a rotary kiln or a converter, the furnace gas contains dust and gaseous As 2O3, and the temperature of the furnace gas is 200-660 ℃, at this time, in order to keep the As 2O3 in the furnace gas in a gaseous state all the time, the temperature of the third gas is preferably 350-450 ℃, preferably 350-400 ℃, the temperature of the first gas is 320-370 ℃, preferably 320-350 ℃, and the temperature of the second gas is 400-450 ℃, preferably 400-420 ℃. In a preferred embodiment, the third gas is at a temperature of 350 ℃, the first gas is at a temperature of 320 ℃, and the second gas is at a temperature of 420 ℃, at which time the stability of the system is the best.
The filter 200 has a filter element that is back-purged after a certain period of use, and preferably is back-purged with a first gas to prevent disturbances in system temperature.
Preferably, a PLC control system is used for controlling the mixing proportion of the first gas, the second gas and the furnace gas to enable the mixed mixture to flow on a flow path at a target temperature, so that control accuracy can be improved, and delay and error caused by manual control are reduced.
Fig. 1 is a schematic structural view of an embodiment of the treatment apparatus for tapping stove gas according to the present invention.
As shown in fig. 1, the treatment apparatus includes a filter 200, and an air inlet pipe and an air outlet pipe connected to the filter 200, the air inlet pipe being connected to an air outlet of a direct current electric furnace, a rotary kiln or a rotary furnace, the filter 200 having a filter element formed of a metal porous film, and a temperature adjusting assembly for adjusting a temperature of an outgoing furnace gas from an outgoing furnace temperature to a target temperature, the target temperature being higher than a desublimation temperature or a liquefaction temperature and lower than a tolerance temperature limit of the filter element in the filter 200.
The temperature regulation assembly comprises a primary heating mechanism, a secondary heating mechanism, a tertiary heating mechanism, a temperature detection mechanism and a PLC control system, wherein the primary heating mechanism is used for heating compressed air into first gas and leading the first gas into an air inlet pipeline, the primary heating mechanism comprises a primary heater 110, a first pipeline and a first valve, the first pipeline is connected with the primary heater 110 and the air inlet pipeline, and the first valve is arranged on the first pipeline. The secondary heating mechanism is used for heating the first gas into second gas and leading the second gas into the air inlet pipeline, the secondary heating mechanism comprises a secondary heater 120, a second pipeline and a second valve, the second pipeline is connected with the secondary heater 120 and the air inlet pipeline, and the second valve is arranged on the second pipeline. The three-stage heating mechanism is used for heating the first gas into third gas and keeping the third gas warm for the filter 200, the air inlet pipeline and the air outlet pipeline, and comprises a jacket and a first fan 131, wherein the jacket is arranged outside the filter 200, the air inlet pipeline and the air outlet pipeline, and the first fan 131 pulls the third gas to flow in the jacket. The temperature detection mechanism is used for detecting the temperature of gas to be filtered in the gas inlet pipeline and/or the temperature of first dust-free gas in the gas outlet pipeline, and comprises a temperature sensor. The PLC control system controls the opening and closing of the first valve and the second valve according to the detection value of the temperature detection mechanism, and the PLC control system preferably but not limited to a controller adopting a PID algorithm.
The treatment equipment further comprises a back blowing mechanism for back blowing and ash cleaning of the filter element, and the back blowing mechanism comprises a back blowing pipe connected with the primary heating mechanism, so that As 2O3 is prevented from condensing and separating out due to the fact that the temperature of the back blowing air is too low.
Preferably, the treatment apparatus comprises two filters 200 connected in parallel, whereby a one-by-one design is used to avoid influencing the normal operation of the furnace when the filters 200 blow back.
The filter medium of the filter 200 is a metal porous film, has extremely strong high temperature resistance and corrosion resistance, has good air permeability, and can control the dust content of the first dust-free gas to be below 10mg/Nm 3.
When the furnace outlet gas is generated by processing arsenic and tin smoke dust, quartz sand and coke powder by a direct current electric furnace, a rotary kiln or a converter, the furnace outlet gas contains dust and gaseous As 2O3, and the furnace outlet temperature of the furnace outlet gas is 200-660 ℃, at this time, the embodiment of the furnace outlet gas processing method comprises the following steps:
(1) The temperature of the furnace gas discharged from the furnace is adjusted from the furnace discharging temperature to 350-450 ℃ by adopting the temperature adjusting method or the processing equipment, and the obtained gas to be filtered is subjected to high-temperature filtering treatment to obtain first dust-free gas;
(2) The first dust-free gas is subjected to desublimation treatment, gaseous As 2O3 in the first dust-free gas is condensed into solid As 2O3, desublimation gas containing the solid As 2O3 is obtained, the desublimation treatment adopts gas-gas contact heat exchange, a cold source is normal-temperature compressed air, the temperature of the obtained desublimation gas is 50-100 ℃, and preferably, part of the solid As 2O3 is collected during the desublimation treatment so As to reduce the load of subsequent gas-solid separation treatment.
(3) Carrying out gas-solid separation treatment on the desublimation gas to obtain an As 2O3 product and a second dust-free gas;
(4) Desulfurizing the second dust-free gas to obtain clean gas;
(5) Clean gas is exhausted through the stack 620.
Before the desublimation treatment, the gas to be filtered composed of the first gas, the second gas and the furnace gas and the first dust-free gas obtained by filtration flow at a target temperature (namely 350-450 ℃) through the treatment of a temperature adjusting method or treatment equipment.
Fig. 2 is a schematic structural view of an embodiment of the treatment system for tapping stove gas according to the present invention.
As shown in fig. 2, an embodiment of a treatment system for a furnace gas is to treat a furnace gas containing dust and gaseous As 2O3 at a temperature of 200-660 ℃, and specifically includes the above-mentioned furnace gas treatment device, condensation unit, recovery unit, desulfurization unit and exhaust unit. In the treatment apparatus, the first dust-free gas is obtained by filtering the gas to be filtered, which is formed by mixing the first gas, the second gas and the furnace gas. The first dust-free gas and the compressed air are mixed in a condensing unit, and then gaseous As 2O3 is condensed into solid As 2O3 to obtain the sublimated gas containing the solid As 2O3, and the condensing unit comprises a gravity dust collector 300 with condensing and dust collecting functions. The recovery unit performs gas-solid separation treatment on the sublimated gas to obtain an As 2O3 product and a second dust-free gas, and comprises a bag dust collector 400. The desulfurization unit includes a dynamic wave scrubber 500. The exhaust unit includes a second fan 610 and a chimney 620, and the second dust-free gas is treated by the desulfurization unit to obtain clean gas, and the clean gas is discharged through the chimney 620 under the traction of the second fan 610.
The content of the present invention is described above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the foregoing, all other embodiments that may be obtained by one of ordinary skill in the art without undue burden are within the scope of the present invention.
Claims (10)
1. A method for regulating the temperature of a tapping gas containing dust and a desublimable or liquefiable gas, characterized in that the method is used for regulating the temperature of the tapping gas from the tapping temperature to a target temperature, which is higher than the desublimation temperature or the liquefiable temperature and lower than the tolerance temperature limit of a filter element in a filter (200) for recovering the dust;
The temperature adjusting method comprises the following steps:
obtaining a first gas, wherein the first gas is obtained by heating compressed air;
Obtaining a second gas, wherein the second gas is obtained by heating the first gas;
obtaining third gas, wherein the third gas is obtained by heating first gas, and the temperature of the third gas is adapted to the target temperature of the furnace gas;
in a flow path before the desublimation treatment or the liquefaction treatment of the gas in the furnace gas, a pipe and a filter (200) on a third gas flow path are used for heat preservation, and the mixed mixture flows on the flow path at a target temperature by controlling the mixing ratio of the first gas, the second gas and the furnace gas.
2. A method for regulating the temperature of a tapping stove gas, wherein the tapping stove gas contains dust and gaseous As 2O3, and the tapping temperature of the tapping stove gas is 200-660 ℃, and the method is characterized in that the temperature regulating method is used for regulating the temperature of the tapping stove gas from the tapping temperature to a target temperature, and the target temperature is higher than the desublimation temperature of the gaseous As 2O3 and lower than the tolerance temperature limit value of a filter element in a filter (200) for recovering the dust;
The temperature adjusting method comprises the following steps:
Obtaining a first gas, wherein the first gas is obtained by heating compressed air, and the temperature of the first gas is 320-370 ℃;
obtaining second gas, wherein the second gas is obtained by heating the first gas, and the temperature of the second gas is 400-450 ℃;
Obtaining third gas, wherein the third gas is obtained by heating first gas, and the temperature of the third gas is 350-450 ℃, and is adapted to the target temperature of the furnace gas;
In the flow path before the desublimation treatment of the gaseous As 2O3 in the off-stream gas, the pipe and the filter (200) on the third gas flow path are used for heat preservation, and then the mixed mixture flows on the flow path at the target temperature by controlling the mixing ratio of the first gas, the second gas and the off-stream gas.
3. The method for regulating the temperature of furnace gas according to claim 2, wherein the target temperature and the temperature of the third gas are 350-400 ℃, the temperature of the first gas is 320-350 ℃, and the temperature of the second gas is 400-420 ℃.
4. The method for regulating the temperature of furnace gas according to claim 2, wherein the filter element is back-blown to remove ash by using the first gas.
5. The method for regulating the temperature of the tapping gas according to claim 2, wherein the tapping gas is generated by treating arsenic-tin dust, quartz sand and coke powder in a direct current electric furnace, a rotary kiln or a converter.
6. The method for regulating the temperature of a furnace gas according to claim 2, wherein the mixing ratio of the first gas, the second gas and the furnace gas is controlled by a PLC control system so that the mixed mixture flows on the flow path at the target temperature.
7. The method for treating the furnace outlet gas, which is generated by treating arsenic-tin smoke dust, quartz sand and coke powder by a direct current electric furnace, a rotary kiln or a converter, comprises dust and gaseous As 2O3, and is characterized by comprising the following steps of:
Adjusting the temperature of the tapping stove gas from the tapping temperature to 350-450 ℃ by adopting the temperature adjusting method according to one of claims 2-6, and filtering the obtained gas to be filtered to obtain first dust-free gas;
The first dust-free gas is subjected to desublimation treatment, so that gaseous As 2O3 in the first dust-free gas is condensed into solid As 2O3, and desublimation gas containing the solid As 2O3 is obtained;
And (3) carrying out gas-solid separation treatment on the desublimation gas to obtain an As 2O3 product and a second dust-free gas.
8. The method for treating furnace gas discharged from a furnace according to claim 7, wherein the desublimation treatment is carried out by gas-gas contact heat exchange, the cold source is normal-temperature compressed air, and the temperature of the obtained desublimation gas is 50-100 ℃.
9. A method of treating off-gas according to claim 7, wherein a portion of the solid As 2O3 is collected during the desublimation treatment.
10. The method for treating a tap gas as claimed in claim 7, further comprising desulfurizing the second dust-free gas, and discharging the desulfurized gas through a chimney (620).
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018731A (en) * | 2014-04-30 | 2015-11-04 | 成都易态科技有限公司 | Lead anodic slime smelting dust gasification and hierarchical temperature-control recovery process |
| CN216878432U (en) * | 2021-12-31 | 2022-07-05 | 成都易态科技有限公司 | Processing system of lead smelting anode mud |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE440794B (en) * | 1980-03-10 | 1985-08-19 | Boliden Ab | PROCEDURE FOR REPAIRING ARSENIC CONTENTS AND / OR METAL SULPHIDE CONCENTRATES FOR EXTRACTION OF ARSENIC |
| CN217745793U (en) * | 2022-01-29 | 2022-11-08 | 成都易态科技有限公司 | Carbon reduction smelting furnace gas purification and utilization system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018731A (en) * | 2014-04-30 | 2015-11-04 | 成都易态科技有限公司 | Lead anodic slime smelting dust gasification and hierarchical temperature-control recovery process |
| CN216878432U (en) * | 2021-12-31 | 2022-07-05 | 成都易态科技有限公司 | Processing system of lead smelting anode mud |
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