System and method for preparing ferrochrome

A technology of ferrochromium alloy and chromite powder, which is applied in the field of metallurgy and can solve the problems of ineffective utilization of poor chromite.

Active Publication Date: 2016-09-28
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, an object of the present invention is to propose a kind of system and method for preparing ferrochrome alloy, and this system has broken the restriction to the raw material of ferrochrome alloy production in

Method used

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  • System and method for preparing ferrochrome
  • System and method for preparing ferrochrome
  • System and method for preparing ferrochrome

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preparation example Construction

[0061] The system for preparing ferrochrome alloy according to the embodiment of the present invention uses a rotary hearth furnace to reduce and roast the dried pellets containing carbonaceous materials, silica, flux, binder and chromite powder. The temperature and atmosphere of the inner reduction zone are used to achieve the selective reduction of iron oxides and chromium oxides in chromite ore powder, so that most of the iron oxides in chromite ore powder are reduced to metallic iron and iron carbide, while a small part Chromium oxide is reduced to chromium carbide, and then the obtained solid reduction product is subjected to acid leaching treatment, in which metallic iron and iron carbide are dissolved by the acid solution and enter the leaching solution, while dichromium trioxide and chromium carbide are insoluble in the acid solution and enter the leaching solution. The chromium-iron ratio in the leaching residue can be significantly increased (the chromium-iron ratio i...

Embodiment 1

[0095] With chromite as raw material, Cr 2 o 3 Content is 35.47wt%, Cr 2 o 3 / FeO=2.1, the chromite ore is ground to -200 mesh, accounting for 65%, the amount of silica added is 6% of the weight of chromite ore, the amount of carbon added is 1.1 times the stoichiometric requirement, and the amount added accounts for chromite 9% binder (the binder contains bentonite and molasses) of iron ore powder mass, mixed with 3% flux (flux contains limestone and Na 2 CO 3 , and Na 2 CO 3 The weight ratio of limestone to limestone is 1:5), and the materials are mixed and pelletized to obtain mixed wet pellets with a diameter of 10-14mm. After the obtained mixed wet pellets are dried, the dried pellets are distributed into the rotary hearth furnace. The maximum temperature in the furnace is set at 1300°C. After the pellets are reduced in the furnace for 60 minutes, they are discharged from the rotary hearth furnace with a screw discharger. The pellets are piled up and leached with dil...

Embodiment 2

[0097] With chromite as raw material, Cr 2 o 3 The content is 38.15wt%, Cr 2 o 3 / FeO=1.95, the chromite ore is ground to -200 mesh, accounting for 75%, the amount of silica added is 8% of the weight of chromite ore, the amount of carbon added is 1.2 times the stoichiometric requirement, and the amount added accounts for chromite 8% bentonite of iron ore powder mass, mixed with 7% flux (flux contains limestone and Na 2 CO 3 , and Na 2 CO 3 The weight ratio of limestone to limestone is 1:4), the materials are mixed and pelletized to obtain mixed wet pellets with a diameter of 10-14mm, and the dried pellets obtained after drying the mixed wet pellets are distributed into the rotary hearth furnace. The maximum temperature in the furnace is set at 1380°C. After the pellets are reduced in the furnace for 30 minutes, they are discharged from the rotary hearth furnace with a screw discharger. The pellets are piled up and leached with dilute sulfuric acid with a mass concentrati...

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Abstract

The invention discloses a system and method for preparing ferrochrome. The system comprises a mixed forming device, a pellet drying device, a rotary hearth furnace, a cooling acid leaching device, a leaching cinder drying device and a smelting device, wherein the mixed forming device is provided with a carbonic material inlet, a silica inlet, a fluxing agent inlet, a binder inlet, a ferrochromium mineral powder inlet, a water inlet and a mixed wet pellet outlet; the pellet drying device is provided with a mixed wet pellet inlet and a dried pellet outlet; a material distribution area, a pre-heating area, a reduction area and a discharging area are sequentially formed in the rotary hearth furnace in the rotation direction of a furnace bottom, a dried pellet inlet is formed in the material distributing area, and a solid reduzate outlet is formed in the discharging area; the cooling acid leaching device is provided with a solid reduzate inlet, a dilute acid inlet, a leaching cinder outlet and a leaching liquid outlet; the leaching cinder drying device is provided with a leaching cinder inlet and a dried cinder outlet; the smelting device is provided with a dried cinder inlet, a ferrochrome outlet and a cinder outlet. By means of the system, the production cost of the ferrochrome can be reduced while the raw material source of the ferrochrome is expanded.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a system and method for preparing ferrochrome alloy. Background technique [0002] Chromium always coexists with iron in nature to form ferrochromium spinel (FeO.Cr 2 o 3 ), whose mineralogical name is chromite. In the metallurgical industry, chromite is mainly used to produce ferrochrome alloy. Ferrochromium is used as an additive to steel to produce a variety of high-strength, corrosion-resistant, wear-resistant, high-temperature-resistant, and oxidation-resistant special steels, such as stainless steel, acid-resistant steel, heat-resistant steel, ball bearing steel, spring steel, tool steel, etc. Chromite ores for the smelting of ferrochromium alloys, except Cr 2 o 3 In addition to grade being a measure of quality, the chromium-iron ratio is also an important indicator. Because the ore or concentrate with a low ratio of chromium to iron, even if...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/24C22B3/08C22B3/02C22B34/32C22C35/00
CPCC22B1/02C22B1/24C22B3/02C22B3/08C22B34/32C22C35/00Y02P10/20
Inventor 王静静任中山曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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