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Production method of chromite oxidized pellets

A technology of oxidized pellets and production methods, which is applied in the field of metallurgy, can solve problems such as large fluctuations in furnace condition stability, poor air permeability of submerged arc furnaces, and large safety hazards, achieving significant environmental protection and economic benefits, and reducing ineffective components Content, the effect of enhancing ball forming

Active Publication Date: 2022-07-12
兴和县新太铁合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides a production method of chromite oxidized pellets, which is used to solve the problems of poor air permeability of submerged arc furnaces caused by too fine particle size of chromite ore powder, large fluctuations in furnace condition stability, high energy consumption, and large safety hazards.

Method used

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  • Production method of chromite oxidized pellets

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Experimental program
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Effect test

Embodiment 1

[0062] In the present embodiment, the production method of chromite oxide pellets, the operation process during concrete work is as follows:

[0063] 1) batching process: the chrome ore powder is fed into the factory for pre-drying treatment, the water content in the chrome ore powder after the pre-drying treatment is 3%, and the drying temperature is 60°C. The chrome ore powder and the binder are measured and mixed to obtain a mixture. The addition amount of the binder accounts for 1% of the weight of the chromium ore powder, and the binder is composed of the following components by weight: 10 parts of bentonite and 2 parts of additives.

[0064] Among them, bentonite contains the following components by weight: CaO 4%, MgO 3%, SiO 2 50%, Al 2 O 3 12%.

[0065] The additive includes the following components in parts by weight:

[0066] 10 parts by weight of sodium polyacrylate;

[0067] 2 parts by weight of dodecyl dimethyl betaine;

[0068] 0.6 parts by weight of diis...

Embodiment 2

[0077] In the present embodiment, the production method of chromite oxide pellets, the operation process during concrete work is as follows:

[0078] The difference from Example 1 is that:

[0079] 1) Batching process: the chrome ore powder is fed into the factory for pre-drying treatment, the water content in the chrome ore powder after the pre-drying treatment is 2%, and the drying temperature is 70°C. The chrome ore powder and the binder are measured and mixed to obtain a mixture. The addition amount of the binder accounts for 2% of the weight of the chromium ore powder, and the binder is composed of the following components in parts by weight: 30 parts of bentonite and 5 parts of additives.

[0080] Among them, the bentonite contains the following components by weight: CaO 4.2%, MgO 3.6%, SiO 2 55%, Al 2 O 3 13%.

[0081] The additive includes the following components in parts by weight:

[0082] 13 parts by weight of sodium polyacrylate;

[0083] 3 parts by weight ...

Embodiment 3

[0093] In the present embodiment, the production method of chromite oxide pellets, the operation process during concrete work is as follows:

[0094] The difference from Example 1 is that:

[0095] 1) Batching process: the chrome ore powder is fed into the factory for pre-drying treatment, the water content in the chrome ore powder after the pre-drying treatment is 1%, and the drying temperature is 80°C. The chrome ore powder and the binder are measured and mixed to obtain a mixture. The addition amount of the binder accounts for 3% of the weight of the chrome ore powder, and the binder is composed of the following components in parts by weight: 40 parts of bentonite and 7 parts of additives.

[0096] Among them, the bentonite contains the following components by weight: CaO 4.5%, MgO 4%, SiO 2 60%, Al 2 O 3 4%.

[0097] The additive includes the following components in parts by weight:

[0098] 15 parts by weight of sodium polyacrylate;

[0099] 5 parts by weight of do...

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Abstract

The invention provides a production method of chromite oxidized pellets, which comprises the following steps: a batching procedure: metering and mixing chromium ore powder and a binder in proportion to obtain a mixture; a grinding step for grinding the mixture; a pelletizing step of pelletizing the mixture obtained by grinding to obtain green pellets; the screening and distributing procedure is used for screening the green pellets and distributing the obtained target green pellets; and drying, preheating and roasting the target green pellets to obtain the chromite oxidized pellets. The grinding procedure comprises dry grinding and wet grinding, particles with the particle size of-200 meshes of a mixture obtained through dry grinding account for 70% or above, and particles with the particle size of-200 meshes of a mixture obtained through wet grinding account for 95% or above. And the diameter of the green pellets is 10-16 mm. According to the method, the drop strength and compressive strength of the chromite oxidized pellets are improved, the air permeability of the submerged arc furnace is improved, energy consumption is reduced, and production safety is improved.

Description

technical field [0001] The present application relates to metallurgical technology, in particular to a method for producing chromite oxide pellets. Background technique [0002] Chromium is a strategically important metal that 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 ferrochromium and metallic chromium. Ferrochromium alloys are used as steel additives to produce a variety of special steels with high strength, corrosion resistance, wear resistance, high temperature resistance and oxidation resistance, such as stainless steel, acid-resistant steel, heat-resistant steel, ball bearing steel, spring steel, tool steel, etc. . Metal chromium is mainly used for smelting special alloys with cobalt, nickel, tungsten and other elements. These special steels and special alloys are indispensable materials for the production of guns, missi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/244C22B1/20C22B1/216C22B1/214
CPCC22B1/2406C22B1/243C22B1/244C22B1/20C22B1/216C22B1/214Y02P10/20
Inventor 孟长海杨玉军
Owner 兴和县新太铁合金有限公司