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WO2020211689A1 - Procédé de fusion et dispositif de fusion pour traiter des matériaux minéraux polymétalliques à base de fer à l'aide d'un procédé court - Google Patents

Procédé de fusion et dispositif de fusion pour traiter des matériaux minéraux polymétalliques à base de fer à l'aide d'un procédé court Download PDF

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Publication number
WO2020211689A1
WO2020211689A1 PCT/CN2020/083785 CN2020083785W WO2020211689A1 WO 2020211689 A1 WO2020211689 A1 WO 2020211689A1 CN 2020083785 W CN2020083785 W CN 2020083785W WO 2020211689 A1 WO2020211689 A1 WO 2020211689A1
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Prior art keywords
smelting
zone
molten pool
melting
iron
Prior art date
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PCT/CN2020/083785
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English (en)
Chinese (zh)
Inventor
李东波
刘诚
黎敏
尉克俭
茹洪顺
李曰荣
徐小锋
曹珂菲
李兵
陈学刚
郭亚光
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China ENFI Engineering Corp
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China ENFI Engineering Corp
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Priority to ZA2020/05923A priority Critical patent/ZA202005923B/en
Publication of WO2020211689A1 publication Critical patent/WO2020211689A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/12—Making spongy iron or liquid steel, by direct processes in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces

Definitions

  • the invention relates to the field of metal smelting, in particular to a smelting method and a smelting device for processing iron-based polymetallic mineral materials in a short process.
  • Vanadium-titanium magnetite is a more difficult ore to smelt.
  • the blast furnace method which is to first sinter or pelletize vanadium-titanium magnetite and then add it to the blast furnace to recover iron and vanadium.
  • the main smelting processes using this process are China's Panzhihua Iron and Steel, Chengcheng Iron and Steel, and Russia's Nizhny Tagil Steel Plant.
  • the second is the rotary kiln-electric furnace method.
  • the blast furnace method is the earliest method developed for processing vanadium-titanium magnetite iron concentrate, which can recover about 90% of iron and about 50% of vanadium, but the titanium element cannot be recovered.
  • the main advantages of blast furnace treatment of vanadium-titanium magnetite are high production efficiency and large production scale.
  • the disadvantages are high comprehensive energy consumption, long process flow, difficult separation of slag and iron, low slag sticking and low desulfurization capabilities.
  • the blast furnace method requires a higher content of TiO 2 in the slag, generally less than 25%.
  • the characteristic of the rotary kiln-electric furnace method is that the vanadium-titanium magnetite concentrate obtained by the beneficiation can be directly used for smelting, the process is short, the recovery rate of iron and vanadium is higher than that of the blast furnace method, but the titanium slag cannot be recycled yet.
  • the prior art (CN107858502A) provides a treatment method for vanadium-titanium magnetite. The treatment method first performs ore dressing, rotary kiln pre-reduction, electric furnace reduction smelting and converter smelting on the vanadium-titanium magnetite coarse ore in sequence to obtain vanadium Slag and semi-steel.
  • the rotary kiln-electric furnace method Compared with the blast furnace method, the rotary kiln-electric furnace method has lower comprehensive energy consumption, does not require coking and sintering, and has better environmental emission indicators.
  • the disadvantage of the rotary kiln-electric furnace method is that the comprehensive energy consumption is still high, and the dependence on electric energy is strong, and it is difficult to promote in areas with scarce power resources or high power costs.
  • the main purpose of the present invention is to provide a smelting method and a smelting device for processing iron-based polymetallic minerals in a short process, so as to solve the problems of long process and high energy consumption in the existing smelting process.
  • a smelting method for processing iron-based polymetallic minerals in a short process is provided.
  • the iron-based polymetallic minerals contain iron, titanium, and vanadium.
  • the smelting method uses The smelting system includes a molten pool smelting device.
  • the molten pool of the molten pool smelting device is provided with partition walls to divide the molten pool into a melting zone and an electrothermal reduction zone, and the bottom of the melting zone is connected with the electrothermal reduction zone, and the molten pool is also provided with The first feeding port and the second feeding port connected to the melting zone, the slag discharge port and the metal discharge port connected to the electrothermal reduction zone, and the first feeding port is set at the top of the melting pool smelting device, and the second feeding port is set at On the side wall of the molten pool smelting device, the smelting method includes: transporting iron-based polymetallic minerals, fuel, flux and oxygen-enriched air to the melting zone for melting and partial reduction to obtain molten liquid; transporting molten liquid and reducing agent To the electrothermal reduction zone for reduction smelting treatment to obtain vanadium-containing molten iron and titanium slag.
  • the melting and partial reduction process includes: adding the iron-based polymetallic mineral material and flux to the melting zone through the first feeding port and/or the second feeding port of the molten pool smelting device, and adding at least one first side blowing spray gun
  • the nozzle is immersed under the solid phase material in the melting zone through the second feeding port, and then the first side blowing spray gun is used to inject fuel and oxygen-enriched air into the melting zone to perform the melting and partial reduction process to obtain the molten liquid;
  • the fuel is selected from one or more of the group consisting of natural gas, coal gas and pulverized coal; preferably, the oxygen-enriched air is a gas with a volume concentration of oxygen greater than 50%.
  • the step of reduction smelting treatment further includes: transporting the molten liquid to the electrothermal reduction zone, and then using a second side blowing spray gun and/or top blowing spray gun to spray the reducing agent above the liquid surface of the electrothermal reduction zone.
  • the temperature of the reduction smelting treatment is 1450 to 1650°C; preferably, the temperature of the reduction smelting treatment is 1500 to 1600°C.
  • the smelting method further includes: pre-treating the iron-based polymetallic mineral material, fuel, flux and reducing agent respectively to make the iron-based polymetallic mineral material, fuel, flux and reducing agent
  • the particle size of the agent is ⁇ 50mm, and the water content is ⁇ 15wt%.
  • the molten pool smelting system further includes a cylindrical mixing device respectively connected with the first feeding port and/or the second feeding port.
  • the smelting method also includes the use of cylindrical mixing The device performs mixing.
  • the smelting system further includes a waste heat recovery device
  • the smelting method also includes a waste heat recovery step.
  • the waste heat recovery step includes: using a waste heat recovery device to recover the heat in the flue gas generated during the melting and partial reduction process and the reduction smelting process; preferably Ground, after the waste heat recovery treatment, the temperature of the flue gas is reduced to 100-200°C; preferably, the waste heat recovery device is a waste heat boiler.
  • the smelting system further includes a dust collection device
  • the smelting method further includes: after the flue gas is subjected to waste heat recovery treatment, the dust collection device is used for dust collection treatment.
  • the height difference between the bottom wall of the melting zone and the bottom wall of the electrothermal reduction zone is 0-500mm, preferably, the height of the bottom wall of the melting zone is higher than the bottom wall of the electrothermal reduction zone, more preferably 150-500mm; Ground, the slope of the receiving portion between the bottom wall of the melting zone and the bottom wall of the electrothermal reduction zone is 0-90°, more preferably 30-60°.
  • iron-based polymetallic mineral material is selected from vanadium-titanium magnetite and/or sea placer.
  • This application provides a molten pool smelting device for processing iron-based polymetallic minerals in a short process.
  • the molten pool smelting device is provided with a molten pool and a partition wall arranged in the molten pool.
  • the partition wall divides the molten pool into melting zones.
  • the molten pool is also provided with a first feeding port and a second feeding port connected with the melting zone, and a slag discharge port and a metal discharge port connected with the electrothermal reduction zone, And the first feeding port is arranged on the top of the molten pool smelting device, and the second feeding port is arranged on the side wall of the molten pool smelting device.
  • the melting zone includes at least one first side blowing spray gun, and the nozzle of the first side blowing spray gun is immersed below the liquid level of the melting zone through the second feeding port to inject fuel and oxygen-enriched air into the melting zone.
  • the electrothermal reduction zone includes: at least one electrode, at least one second side blowing spray gun and at least one top blowing spray gun, and the end of the electrode is located below the solid phase material in the electrothermal reduction zone for supplying heat to the electrothermal reduction process; second The nozzle of the side blowing spray gun and the nozzle of the top blowing spray gun are both located above the liquid level of the electrothermal reduction zone, and are used to spray the reducing agent into the electrothermal reduction zone; preferably, each second side blowing spray gun is respectively arranged on the opposite side of the reduction zone On the wall.
  • the height difference between the bottom wall of the melting zone and the bottom wall of the electrothermal reduction zone is 0-500mm, preferably, the height of the bottom wall of the melting zone is higher than that of the electrothermal reduction zone, more preferably 150-500mm.
  • the slope of the receiving part between the bottom wall of the melting zone and the bottom wall of the electrothermal reduction zone is 0-90°.
  • the molten pool smelting device is also provided with a flue, and the flue is arranged on the top of the molten pool corresponding to the electrothermal reduction zone.
  • the above-mentioned smelting process the melting and partial reduction process, and the electrothermal reduction process are performed in the same bath smelting device.
  • the area required for the above-mentioned smelting process is small, the configuration height difference of the molten pool smelting device is reduced, and the capital investment in the molten pool smelting device can also be reduced; on the other hand, it can save the melt discharge and The added operation steps improve the production efficiency and reduce the consumption of operators and corresponding tools.
  • the melting and partial reduction process and the electrothermal reduction process are completed in the same molten pool smelting device, and the electrothermal reduction zone can also use the heat of the molten liquid to maintain a higher temperature, reducing the power consumption during the individual reduction and depletion;
  • the amount of melt stored in the furnace is relatively large, which can increase the slag storage time and facilitate the separation of titanium slag and vanadium-containing molten iron; at the same time, the flue gas generated by the two processes can be mixed for treatment, reducing construction Investment in two flue gas treatment systems.
  • Fig. 1 shows a schematic flow chart of a smelting method for processing iron-based polymetallic mineral materials according to a preferred embodiment of the present invention
  • Figure 2 shows a schematic structural diagram of a molten pool smelting device for processing iron-based polymetallic minerals according to a preferred embodiment of the present invention
  • Figure 3 shows an A-A side view of a molten pool smelting system for processing iron-based polymetallic minerals according to a preferred embodiment of the present invention
  • Fig. 4 shows a C-C side view of a molten pool smelting system for processing iron-based polymetallic minerals according to a preferred embodiment of the present invention.
  • the existing smelting process has the problems of long flow and high energy consumption.
  • this application provides a smelting method for processing iron-based polymetallic minerals in a short process.
  • the iron-based polymetallic minerals contain iron, titanium, and vanadium.
  • the smelting system used in the smelting method includes The molten pool smelting device, the molten pool of the molten pool smelting device is provided with a partition wall 30 to divide the molten pool into a melting zone 10 and an electrothermal reduction zone 20, and the bottom of the melting zone 10 is connected to the electrothermal reduction zone 20, the molten pool
  • the smelting device is provided with a first feeding port 101 and a second feeding port 102 communicating with the melting zone 10, and a slag discharge port 201 and a metal discharge port 202 communicating with the electrothermal reduction zone 20, and the first feeding port 101 is set in the molten pool
  • the second feeding port 102 is set on the side wall of the molten pool smelting device; the first feeding port 101, the second feeding port 102, and the slag discharge port 201 are set on the side wall of the molten pool smelting device.
  • the second feeding port 102 is arranged on the side wall of the melting pool smelting device; the mixing outlet is connected to the first feeding port 101 and/or the second feeding port 102, as shown in FIG. 1, the above-mentioned smelting method includes: The iron-based polymetallic mineral material, fuel, flux and oxygen-enriched air are transported to the melting zone 10 for melting and partial reduction to obtain a molten liquid; the molten liquid and reducing agent are transported to the electrothermal reduction zone 20 for reduction smelting treatment to obtain vanadium-containing Elemental molten iron and titanium slag.
  • the partition wall 30 divides the molten pool into a melting zone 10 and an electrothermal reduction zone 20, so that the melting and partial reduction process and the electrothermal reduction process can be completed in one smelting device, and the partition wall 30 can also suppress the melting zone.
  • the unreacted materials in 10 enter the electrothermal reduction zone 20.
  • the raw materials are fed into the melting zone 10 through the first feeding port 101 and/or the second feeding port 102, and the heat is provided by the combustion of fuel and oxygen-enriched air, so that the iron-based polymetallic minerals are melted and partially reduced ,
  • the addition of the flux can separate the impurities in the iron-based polymetallic mineral material from the iron element in the form of titanium slag, while reducing the melting point to obtain the molten liquid; after the molten liquid is transported to the electrothermal reduction zone 20, the reducing agent and the molten liquid Iron, vanadium, etc. are reduced.
  • the liquid phase product and solid phase product in the reduction product system are separated to obtain vanadium-containing molten iron and titanium slag, which are correspondingly passed through the slag outlet 201 and the metal The discharge port 202 discharges.
  • the above smelting process, melting and partial reduction process and electrothermal reduction process are carried out in the same molten pool smelting device.
  • the area required for the above-mentioned smelting process is small, the configuration height difference of the molten pool smelting device is reduced, and the capital investment in the molten pool smelting device can also be reduced; on the other hand, it can save the melt discharge and
  • the added operation steps improve the production efficiency and reduce the consumption of operators and corresponding tools.
  • the melting and partial reduction process and the electrothermal reduction process are completed in the same molten pool smelting device, and the electrothermal reduction zone 20 can also use the heat of the molten liquid to maintain a higher temperature, reducing the consumption of electric energy during separate reduction and depletion;
  • the pool takes into account both melting and reduction and depletion operations.
  • the amount of melt stored in the furnace is relatively large, which can increase the slag storage time and facilitate the separation of titanium slag and vanadium-containing molten iron; at the same time, the flue gas generated by the two processes can be mixed for treatment, reducing Investment in the construction of two flue gas treatment systems.
  • the iron-based polymetallic mineral material mentioned in this application is selected from vanadium-titanium magnetite and/or sea placer.
  • the above-mentioned melting and partial reduction process includes: adding iron-based polymetallic mineral materials and flux into the melting zone 10 through the first feeding port 101 and/or the second feeding port 102 of the molten pool smelting device , And immerse the nozzle of at least one first side blowing spray gun 11 under the solid phase material in the melting zone 10 through the second feeding port 102, and then use the first side blowing spray gun 11 to inject fuel and oxygen-enriched air into the melting zone 10.
  • the molten liquid is obtained.
  • first side blowing spray gun 11 to inject fuel and oxygen-enriched air into the solid phase material in the melting zone 10 can strongly agitate the molten liquid, thereby helping to improve the efficiency of mass and heat transfer, and at the same time, it is also beneficial to improve The subsequent recovery rate of vanadium, etc.
  • the fuel can be of the type commonly used in this field.
  • the fuel is selected from one or more of the group consisting of natural gas, coal gas and pulverized coal.
  • the combustion coefficient is controlled at 0.4 to 0.65.
  • oxygen-enriched air refers to a gas whose volume of oxygen content is higher than 21 vol%.
  • the oxygen-enriched air has a volume concentration of oxygen greater than 50% gas. The use of the above-mentioned oxygen-enriched air is beneficial to further improve the efficiency of the melting process.
  • the step of reduction smelting treatment further includes: the molten liquid is transported to the electrothermal reduction zone 20, and then the second side blowing spray gun 22 and/or the top blowing spray gun 23 are used to inject the reducing agent into the electrothermal reduction zone. Zone 20 above the liquid level.
  • the use of the second side blowing spray gun 22 and/or the top blowing spray gun 23 to spray the reducing agent can increase the contact area between the molten liquid and the reducing agent, so that the two fully react, thereby strengthening the reduction process of metallic vanadium.
  • Spraying the reducing agent above the liquid surface of the electrothermal reduction zone 20 is beneficial to prevent the addition of raw materials from causing agitation on the liquid surface of the electrothermal reduction zone 20, thereby reducing the separation efficiency of vanadium-containing molten iron and titanium slag during the depletion process. influences.
  • the second side blowing spray guns 22 are respectively arranged on the opposite side walls of the reduction zone to achieve the purpose of blowing on both sides, which is beneficial to further improve the reduction efficiency.
  • the second side blowing spray gun 22 is preferably a multi-channel multi-fuel composite submerged combustion spray gun.
  • the temperature of the reduction smelting treatment is 1450-1650°C; preferably, the temperature of the reduction smelting treatment is 1500-1600°C.
  • the smelting method before performing the melting and partial reduction process, further includes: separately pre-treating the iron-based polymetallic mineral material, fuel, flux and reducing agent to make the iron-based polymetallic mineral material ,
  • the particle size of fuel, flux and reducing agent are all ⁇ 50mm, and the water content is all ⁇ 15wt%.
  • the particle size and water content of the iron-based polymetallic mineral material include but are not limited to the above range, and limiting it to the above range is beneficial to improve the melting efficiency of the iron-based polymetallic raw material.
  • the molten pool smelting system further includes a cylinder mixing device respectively connected to the first feeding port 101 and/or the second feeding port 102.
  • the smelting method also includes the use of a cylinder The mixing device performs mixing.
  • the smelting system further includes a waste heat recovery device
  • the smelting method further includes a waste heat recovery step.
  • the waste heat recovery step includes: using a waste heat recovery device to recover the melting and partial reduction process and reduction The heat in the flue gas produced during the smelting process.
  • the waste heat recovery device is a waste heat boiler. More preferably, after the waste heat recovery treatment, the temperature of the flue gas is reduced to 100-200°C.
  • the smelting system further includes a dust collecting device, and the smelting method further includes: After the waste heat recovery treatment, the dust collection device is used for dust collection treatment.
  • the height difference between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 0-500 mm.
  • the height of the bottom wall of the melting zone 10 is higher than the bottom wall of the electrothermal reduction zone 20. Since the bottom wall of the melting zone 10 is higher than the bottom wall of the electrothermal reduction zone 20, and the bottom of the melting zone 10 is connected to the electrothermal reduction zone 20, this can separate the molten iron-based polymetallic mineral from the incompletely molten raw materials, The reduction object of the reducing agent is more targeted, which is beneficial to improve the recovery rate of iron and vanadium in the electrothermal reduction process. In order to further increase the recovery rate of vanadium, it is more preferable that the height difference between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 150-500 mm.
  • the slope of the receiving portion between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 0-90°, preferably 30°. ⁇ 60°.
  • the oxides of Fe and V in the iron-based polymetallic mineral material are reduced to form a metal phase, that is, vanadium-containing molten iron, and at the same time, TiO 2 , SiO 2 and CaO combine to form a slag phase.
  • the weight percentage of the titanium slag whose slag type is TiO 2 -SiO 2 -CaO in the titanium slag is 75-90 wt %.
  • the slag type can be adjusted by adding limestone according to the raw material.
  • the amount of flux is 0-20% based on the weight percentage of the iron-based polymetallic mineral material. Limiting the amount of flux within the above range is beneficial to control the content of titanium in the titanium slag, so that it can be further applied later.
  • Another aspect of the present application also provides a molten pool smelting device for processing iron-based polymetallic minerals in a short process.
  • the molten pool smelting device is provided with a molten pool and is arranged in the molten pool.
  • the partition wall 30 divides the molten pool into a melting zone 10 and an electrothermal reduction zone 20, and the bottom of the melting zone 10 is connected to the electrothermal reduction zone 20, and the molten pool smelting device is provided with a first communicating zone 10
  • the partition wall 30 divides the molten pool into a melting zone 10 and an electrothermal reduction zone 20, so that the melting and partial reduction process and the electrothermal reduction process can be completed in one smelting device.
  • the raw materials are fed into the melting zone 10 through the first feeding port 101 and/or the second feeding port 102, and the heat is provided by the combustion of fuel and oxygen-enriched air, so that the iron-based polymetallic minerals are melted and partially reduced .
  • the addition of the flux can separate the impurities in the iron-based polymetallic mineral material from the iron element in the form of titanium slag, while reducing the melting point to obtain the molten liquid; after the molten liquid is transported to the electrothermal reduction zone 20, the reducing agent and the molten liquid Iron, vanadium, etc.
  • the iron-based polymetallic minerals can be smelted by using the above-mentioned molten pool smelting device, so that the melting and partial reduction process and the electrothermal reduction process can be performed in the same molten pool smelting device.
  • the area required for the above-mentioned smelting process is small, the configuration height difference of the molten pool smelting device is reduced, and the capital investment in the molten pool smelting device can also be reduced; on the other hand, it can save the melt discharge and The added operation steps improve the production efficiency and reduce the consumption of operators and corresponding tools.
  • the melting and partial reduction process and the electrothermal reduction process are completed in the same molten pool smelting device, and the electrothermal reduction zone 20 can also use the heat of the molten liquid to maintain a higher temperature, reducing the consumption of electric energy during separate reduction and depletion;
  • the pool takes into account both melting and reduction and depletion operations.
  • the amount of melt stored in the furnace is relatively large, which can increase the slag storage time, which is beneficial to the separation of titanium slag and vanadium-containing molten iron, and improves the recovery rate of vanadium; the flue gas produced by the two zones can be Mixed treatment reduces the investment in the construction of two flue gas treatment systems.
  • the melting zone 10 includes at least one first side blowing spray gun 11, and the nozzle of the first side blowing spray gun 11 is immersed in the solid phase of the melting zone 10 through the second feeding port 102. Below the material, to spray fuel and oxygen-enriched air into the melting zone 10.
  • Using the first side blowing lance 11 to inject fuel and oxygen-enriched air into the melting zone 10 can strongly agitate the molten liquid therein, thereby helping to improve the efficiency of mass and heat transfer, and at the same time, it is also beneficial to improve the subsequent vanadium and other elements. Recovery rate.
  • the electrothermal reduction zone 20 includes at least one electrode 21, at least one second side blowing spray gun 22 and at least one top blowing spray gun 23.
  • the end of each electrode 21 is located below the solid phase material in the electrothermal reduction zone 20 for supplying heat to the electrothermal reduction process; the nozzle of the second side blowing spray gun 22 and the nozzle of the top blowing spray gun 23 are both located above the liquid surface of the electrothermal reduction zone 20 , Used to spray the reducing agent into the electrothermal reduction zone 20.
  • Using the second side blowing spray gun 22 and/or the top blowing spray gun 23 to spray the reducing agent can increase the contact area between the molten liquid and the reducing agent, so that the two can fully react.
  • the reducing agent is sprayed above the liquid surface of the electrothermal reduction zone 20, which is beneficial to inhibit the addition of raw materials from causing agitation on the liquid surface of the electrothermal reduction zone 20, thereby reducing the separation efficiency of vanadium-containing molten iron and titanium slag during the depletion process Impact.
  • the height difference between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 0-500 mm.
  • the height of the bottom wall of the melting zone 10 is higher than the bottom wall of the electrothermal reduction zone 20. Since the bottom wall of the melting zone 10 is higher than the bottom wall of the electrothermal reduction zone 20, and the bottom of the melting zone 10 is connected to the electrothermal reduction zone 20, this can separate the molten iron-based polymetallic mineral from the incompletely molten raw materials, The reduction object of the reducing agent is more targeted, which is beneficial to improve the recovery rate of iron and vanadium in the electrothermal reduction process. In order to further increase the recovery rate of vanadium, it is more preferable that the height difference between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 150-500 mm.
  • the slope of the receiving portion between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 0 to 90°.
  • the molten pool smelting device is also provided with a flue 24, which is set in The top of the molten pool corresponding to the electrothermal reduction zone 20.
  • a flue 24 is arranged at the top of the molten pool corresponding to the electrothermal reduction zone 20 and close to the melting zone 10.
  • the composition of the iron-based polymetallic mineral materials in Examples 1 to 9 and Comparative Example 1 is Fe 45 ⁇ 62wt%, TiO 2 7 ⁇ 20wt%, V 2 O 5 0.1 ⁇ 1.2wt%, and the rest are impurities.
  • the process flow is shown in Figure 1. Shown.
  • a partition wall 30 is arranged inside the molten pool of the molten pool smelting device to divide the molten pool into a melting zone 10 and an electrothermal reduction zone 20, and the bottom of the melting zone 10 is connected to the electrothermal reduction zone 20 .
  • the materials fed into the furnace are fed into the melting zone from the second feeding port 102.
  • the melting zone 10 includes a first side blowing spray gun 11. The nozzle of the first side blowing spray gun 11 is immersed under the solid phase material in the melting zone 10 to spray to the melting zone 10. Into fuel and oxygen-enriched air.
  • the electrothermal reduction zone 20 is provided with three electrodes 21 (self-baking electrodes), and AC power is used.
  • a second side blowing spray gun 22 and a top blowing spray gun 23 are provided.
  • the end of each electrode 21 is located below the solid phase material in the electrothermal reduction zone 20 and is used to supply heat to the electrothermal reduction process;
  • the nozzle of the second side blowing spray gun 22 is located above the liquid surface of the electrothermal reduction zone 20 and is used to spray the reducing agent into Electric heating reduction zone 20.
  • the height difference between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 200 mm, and the slope of the receiving portion between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 45°.
  • the molten pool smelting device is also provided with a flue 24, and the flue 24 is arranged at the top of the molten pool corresponding to the electrothermal reduction zone 20.
  • the flue 24 is arranged at the top of the molten pool corresponding to the electrothermal reduction zone 20 and close to the melting zone 10.
  • the reduction smelting temperature during the smelting process is about 1600°C.
  • the recovery rate of vanadium is 96% by weight, and the recovery rate of iron is 89% by weight.
  • the fusion zone does not use submerged side blowing guns to inject fuel.
  • the recovery rate of vanadium is 91wt%
  • the recovery rate of iron is 86wt%
  • the comprehensive energy consumption is 8% higher than that of Example 1.
  • Example 1 The difference from Example 1 is that the temperature of the reduction smelting treatment is 1550°C.
  • the recovery rate of vanadium is 87wt%
  • the recovery rate of iron is 85wt%
  • the comprehensive energy consumption is 6% higher than that of Example 1.
  • Embodiment 1 The difference from Embodiment 1 is that the height difference between the bottom wall of the melting zone 10 and the bottom wall of the electrothermal reduction zone 20 is 100 mm.
  • the recovery rate of vanadium is 88 wt%, and the recovery rate of iron is 85 wt%.
  • Embodiment 1 The difference from Embodiment 1 is that the materials entering the furnace are added from the first feeding port 101 instead of being injected through the inert gas from the second feeding port 102.
  • the recovery rate of vanadium is 93wt%
  • the recovery rate of iron is 87wt%
  • the comprehensive energy consumption is 5% higher than that of Example 1.
  • Embodiment 1 The difference from Embodiment 1 is that a part of the material entering the furnace is fed from the first feeding port 101, and the other part is sprayed from the second feeding port 102 at the same time.
  • the recovery rate of vanadium is 97 wt%, and the recovery rate of iron is 87 wt%.
  • Embodiment 1 The difference from Embodiment 1 is that the number of electrodes 21 in the electrothermal reduction zone 20 is two.
  • the recovery rate of vanadium is 94 wt%, and the recovery rate of iron is 85 wt%.
  • the difference from Embodiment 1 is that the material of the electrode 21 of the electrothermal reduction zone 20 is a graphite electrode.
  • the recovery rate of vanadium is 95 wt%, and the recovery rate of iron is 88 wt%.
  • Embodiment 1 The difference from Embodiment 1 is that the electrothermal reduction zone 20 adopts a top blowing spray gun 23 to add reducing agent.
  • the recovery rate of vanadium is 94wt%
  • the recovery rate of iron is 87wt%
  • the comprehensive energy consumption is 5% higher than that of Example 1.
  • Embodiment 1 The difference from Embodiment 1 is that there is no partition wall between the melting zone 10 and the electrothermal reduction zone 20.
  • the recovery rate of vanadium is 82wt%
  • the recovery rate of iron is 85wt%
  • the comprehensive energy consumption is 5% higher than that of Example 1.
  • the above-mentioned smelting process the above-mentioned smelting process, the melting and partial reduction process, and the electrothermal reduction process are performed in the same bath smelting device.
  • the area required for the above-mentioned smelting process is small, the configuration height difference of the molten pool smelting device is reduced, and the capital investment in the molten pool smelting device can also be reduced; on the other hand, it can save the melt discharge and The added operation steps improve the production efficiency and reduce the consumption of operators and corresponding tools.
  • the melting and partial reduction process and the electrothermal reduction process are completed in the same molten pool smelting device, and the electrothermal reduction zone can also use the heat of the molten liquid to maintain a higher temperature, reducing the power consumption during the individual reduction and depletion;
  • the amount of melt stored in the furnace is relatively large, which can increase the slag storage time and facilitate the separation of titanium slag and vanadium-containing molten iron; at the same time, the flue gas generated by the two processes can be mixed for treatment, reducing construction Investment in two flue gas treatment systems.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé de fusion et un dispositif de fusion pour traiter un minéral polymétallique à base de fer à l'aide d'un procédé court. Le système de fusion utilisé dans le procédé de fusion comprend un dispositif de fusion en bain. Une paroi de séparation (30) est disposée dans le bain du dispositif de fusion en bain. La paroi de séparation divise le bain en une zone de fusion (10) et une zone de réduction électrothermique (20), et le fond de la zone de fusion (10) est relié à la zone de réduction électrothermique (20). Le procédé de fusion comprend le transport des minéraux polymétalliques à base de fer, du combustible, d'un flux et de l'air enrichi en oxygène dans la zone de fusion, et la réalisation d'une fusion et d'une réduction partielle pour obtenir un liquide fondu ; transporter le liquide fondu et un agent réducteur vers la zone de réduction électrothermique et effectuer un traitement de fusion - réduction pour obtenir du fer fondu contenant du vanadium et du laitier de titane.
PCT/CN2020/083785 2019-04-17 2020-04-08 Procédé de fusion et dispositif de fusion pour traiter des matériaux minéraux polymétalliques à base de fer à l'aide d'un procédé court Ceased WO2020211689A1 (fr)

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