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Method for preparing reduction chromium powder through microwave heating

A technology of microwave heating and chromium powder, which is applied in the field of preparation of reduced chromium powder by microwave heating, which can solve the problems of high energy consumption, harsh control requirements, complicated and lengthy process, etc., and achieves increased heating rate, shortened production cycle, and simple reduction process Effect

Inactive Publication Date: 2014-08-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned carbothermal reduction method still needs to be carried out in a high-temperature vacuum environment, and the control requirements are harsh, the process is extremely complicated and lengthy, and the energy consumption is extremely high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for preparing reduced chromium powder by microwave heating, its concrete steps are as follows:

[0018] (1) First put Cr 2 o 3 , charcoal, and coal are crushed to a particle size of 100 mesh, and then the Cr 2 o 3 , charcoal according to the mass ratio of 100:24 mixed evenly to obtain the mixed material, in which Cr 2 o 3 Middle T Cr =95.1%, fixed carbon in charcoal ≥78%, ash content ≤0.5%, fixed carbon in coal ≥70%, ash content ≤20%;

[0019] (2) Layered distribution: the bottom layer is distributed with the mixture obtained in step (1), and the upper layer is distributed with pulverized coal prepared in step (1) with a mass of 3% of the mixture;

[0020] (3) Place the materials arranged in step (2) in a microwave reactor and heat them to 1350°C for 40 minutes, then cool, pulverize and sieve the reduced and heated charge to obtain reduced chromium powder with a metallization rate of 91%. .

Embodiment 2

[0022] The method for preparing reduced chromium powder by microwave heating, its concrete steps are as follows:

[0023] (1) First put Cr 2 o 3 , charcoal, and coal are crushed to a particle size of 100 mesh, and then the Cr 2 o 3 , charcoal according to the mass ratio of 100:25 mixed evenly to obtain the mixed material, in which Cr 2 o 3 Middle T Cr =98.2%, fixed carbon in charcoal ≥78%, ash content ≤0.5%, fixed carbon in coal ≥70%, ash content ≤20%;

[0024] (2) Layered distribution: the mixed material obtained in the step (1) is distributed on the bottom layer, and the pulverized coal powder prepared in the step (1) with a mass of 4% of the mixed material is distributed on the upper layer;

[0025] (3) Place the materials arranged in step (2) in a microwave reactor and heat them to 1400°C for 40 minutes, then cool, pulverize and sieve the furnace material after reduction heating to obtain reduced chromium powder with a metallization rate of 92.3% .

Embodiment 3

[0027] The method for preparing reduced chromium powder by microwave heating, its concrete steps are as follows:

[0028] (1) First put Cr 2 o 3 , charcoal, coal crushed to a particle size of 120 mesh, and then Cr 2 o 3 , charcoal according to the mass ratio of 100:24 mixed evenly to obtain the mixed material, in which Cr 2 o 3 Middle T Cr ≥99%, fixed carbon in charcoal ≥78%, ash content ≤0.5%, fixed carbon in coal ≥70%, ash content ≤20%;

[0029] (2) Layered distribution: the mixed material obtained in the step (1) is distributed on the bottom layer, and the pulverized coal powder prepared in the step (1) with a mass of 3% of the mixed material is distributed on the upper layer;

[0030] (3) Place the materials arranged in step (2) in a microwave reactor and heat them to 1300°C for 60 minutes, then cool, pulverize and sieve the furnace material after reduction heating to obtain reduced chromium powder with a metallization rate of 90.3%. .

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Abstract

The invention relates to a method for preparing reduction chromium powder through microwave heating and belongs to the technical field of microwave metallurgy. The method comprises the steps that firstly, Cr2O3, charcoal and coal are smashed, and then the Cr2O3 and the charcoal are evenly mixed to obtained a mixed material; secondly, materials are distributed in a layered mode, wherein the mixed material obtained in the first step is distributed and arranged on the bottom layer, and the smashed coal powder which is prepared in the first step and accounts for, by mass, three to four percent of the mixed material is distributed and arranged on the upper layer; thirdly, the materials arranged in second step are put in a microwave reactor to be heated to 1300 DEG C to 1400 DEG C with heat preservation carried out for 30 min to 60 min, the reduced and heated furnace charge is cooled, smashed and screened, and thus the reduction chromium powder is obtained. According to the method, due to the fact that microwaves are taken as a heating source, the temperature increasing speed and the heating efficiency are improved, the obtained product is made to be in a fluffy state, and meanwhile the rawish phenomenon is avoided.

Description

technical field [0001] The invention relates to a method for preparing reduced chromium powder by microwave heating, which belongs to the technical field of microwave metallurgy. Background technique [0002] Metal chromium is a basic raw material, widely used in metallurgy, chemical industry, aerospace and refractory fields. The current production methods of metallic chromium include aluminothermic method, electrolytic method and carbothermal reduction method. The thermite method not only consumes a large amount of valuable aluminum powder, but also the recovery rate of the product is not high, usually not more than 88%, and the product also contains a large amount of impurities. The advantage of the electrolysis method is that the product has high purity and the chromium content is greater than 99.55%. The disadvantage is that the production process consumes a lot of electricity, causes serious pollution, and the production cost is high. [0003] The most widely used met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20
Inventor 朱红波叶乾旭彭金辉张利波代林晴陈建普靖忠
Owner KUNMING UNIV OF SCI & TECH
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