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Ferrochrome preparation method

A technology of ferrochromium alloy and chromite powder, applied in the field of metallurgy, can solve the problems of increasing the pre-oxidation link, increasing the investment cost, and lengthening the process, and achieves the effects of shortening the production process, reducing the preparation cost and lowering the price.

Active Publication Date: 2015-12-09
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to improve the reduction effect, this method adds a chromite pre-oxidation link, the process becomes longer, and the investment cost increases; at the same time, silica and lime need to be added as fluxes; in addition, the pellets are reduced in the rotary hearth furnace for 1.5 to 3 hours. relatively long time

Method used

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  • Ferrochrome preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Composition of materials: TFe content in chromite powder is 15.81wt%, Cr / Fe mass ratio is 1.8, particle size below 75 microns accounts for 88wt%; reducing agent adopts blue carbon, fixed carbon is 82.26wt%, particle size Those below 75 microns can account for more than 96wt%; the auxiliary reducing agent is sodium carbonate, and those with a particle size below 75 microns account for 90wt%; the nucleating agent is ferrochrome powder, and the average particle size is 0.5 mm; the binder is bentonite;

[0058] Preparation method: mix chromite powder with reducing agent, co-reducing agent, nucleating agent and bentonite according to the mass ratio of 100:30:3:5:3 to obtain a mixed material, and then add 8wt of the mixed material to the mixed material After adding 100% water, pelletizing is carried out to obtain material pellets (particle diameter is 10 mm), and the obtained material pellets are dried to obtain dry pellets, and then the dry pellets are distributed into the re...

Embodiment 2

[0060] Material composition: TFe content in chromite powder is 13.28wt%, Cr / Fe mass ratio is 1.42, particle size below 75 microns accounts for 98wt%; reducing agent is anthracite, fixed carbon is 80.44wt%, particle size is low 92wt% of the particle size is 75 microns; limestone is used as the auxiliary reducing agent, and 85wt% is used for the particle size below 75 microns; the nucleating agent is ferrochrome powder, and the average particle size is 0.2 mm; the binder is bentonite;

[0061] Preparation method: mix chromite powder with reducing agent, co-reducing agent, nucleating agent and binder according to the mass ratio of 100:35:3:5:3 to obtain a mixed material, and then add the mixture to the mixed material After feeding 8wt% of water, pelletizing is carried out to obtain material pellets (particle diameter is 10 mm), and the obtained material pellets are dried to obtain dry pellets, and then the dry pellets are distributed into the regenerative rotary hearth furnace , th...

Embodiment 3

[0063] Composition of materials: TFe content in chromite powder is 13.28wt%, Cr / Fe mass ratio is 2.17, particle size below 75 microns accounts for 86wt%; reducing agent adopts blue carbon, fixed carbon is 82.26wt%, particle size Those below 75 microns account for 96 wt%; the co-reducing agent is borax, and those with a particle size below 75 microns account for 86 wt%; the nucleating agent is iron powder, and the average particle size is 0.5 mm; the binder is molasses;

[0064] Preparation method: mix chromite powder with reducing agent, co-reducing agent, nucleating agent and binder according to the mass ratio of 100:26:3:5:3 to obtain a mixed material, and then add the mixture to the mixed material After feeding 8wt% of water, pelletizing is carried out to obtain material pellets (particle diameter is 10 mm), and the obtained material pellets are dried to obtain dry pellets, and then the dry pellets are distributed into the regenerative rotary hearth furnace , the thickness ...

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Abstract

The invention discloses a ferrochrome preparation method. The ferrochrome preparation method comprises the following steps: (1) mixing chromite ore fine, a reducing agent, a reducing assistant, a nucleating agent and a binder to conveniently obtain a mixed material; (2) adding water into the mixed material for pelletizing to conveniently obtain mixed pellets; (3) drying the mixed pellets to conveniently obtain dry pellets; (4) performing reduction treatment of the dry pellets in a reduction roaster to conveniently obtain metallic pellets; (5) cooling down the metallic pellets in a seal pot to conveniently obtain cooled pellets; and (6) performing crushing and magnetic separation of the cooled pellets to conveniently obtain ferrochrome and tailings. The ferrochrome preparation method can effectively utilize chromite powder resource and is low in production cost and simple in process, and chromium in the obtained ferrochrome is high in grade.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular, the invention relates to a method for preparing ferrochrome alloy. Background technique [0002] Ferrochromium can be used as steelmaking additives to produce a variety of special steels, such as stainless steel, spring steel, tool steel, etc. These special steels and special alloys are widely used in the fields of aviation, aerospace, automobiles, shipbuilding and national defense industries. At the same time, metal chromium is also a national strategic metal, which is mainly used to smelt special alloys with cobalt, nickel, tungsten and other elements. However, my country's chromite ore resources are poor, and the reserved reserves only account for 0.15% of the world's reserves. 95% of the chromite ore depends on imports. At the same time, the chromite ore powder ore in the existing production process cannot be effectively utilized. The process of smelting ferrochromium from chromite or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02C22B1/26C22C35/00
Inventor 任中山曹志成薛逊吴道洪
Owner SHENWU TECH GRP CO LTD
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