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A kind of method that two-step method reduces chromium oxide to prepare metallic chromium powder

A technology of metal chromium powder and chromium oxide, which is applied in the field of carbonaceous reducing agent, chromium oxide and metal magnesium to produce chromium powder, can solve the problems of low chromium recovery rate and limited production scale, and achieve high chromium recovery rate and low raw material cost low effect

Active Publication Date: 2020-02-04
鑫沣电子科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former has a low chromium recovery rate of about 90%; the latter is suitable for the production of ductile chromium, but the scale of production is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Combine carbon black with chromium oxide (Cr 2 o 3 ) is weighed and mixed uniformly by mass ratio 1:5.25, and then the mixture is placed in a briquetting mold for briquetting.

[0020] (2) The block pressed in (1) is placed in a high-temperature vacuum furnace with a pressure of 10 Pa and roasted for 4 hours.

[0021] (3) The obtained calcined block was crushed to -50 mesh, and the crushed powder was uniformly mixed with metal magnesium powder at a mass ratio of 1:0.12; the mixture was heated at 800° C. for 3 hours under an argon atmosphere.

[0022] (4) The product in (3) is pickled in hydrochloric acid (0.5mol / L), filtered, washed and dried to obtain pure metal chromium powder.

Embodiment 2

[0024] (1) Combine graphite powder with chromium oxide (Cr 2 o 3 ) weighed and mixed homogeneously by mass ratio 1:4.4, then the mixture is placed in a briquetting mold for briquetting.

[0025] (2) The block pressed in (1) is placed in a high-temperature vacuum furnace with a pressure of 10 Pa and roasted for 6 hours.

[0026] (3) The obtained calcined block was crushed to -50 mesh, and the crushed powder was uniformly mixed with metal magnesium powder at a mass ratio of 1:0.04; the mixture was heated at 800° C. for 3 hours under an argon atmosphere.

[0027] (4) The product in (3) is pickled in hydrochloric acid (0.5mol / L), filtered, washed and dried to obtain pure metal chromium powder.

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PUM

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Abstract

The invention relates to a preparation method of metal chromium powder, in particular to a method for preparing metal chromium powder by reducing chromium oxide by a two-step method, and belongs to the field of ferrous metallurgy. At present, the main method of industrial preparation of metal chromium is aluminothermic reduction or an electrolytic method, and the methods have the problems of low chromium recovery, high production cost and small production scale respectively. The method comprises the steps of using chromic oxide (Cr2O3) powder, a carbonaceous reducing agent and magnesium powderas raw materials, and generating a mixture of metal chromium and chromic oxide (Cr2O3) by vacuum high temperature carbon thermal reduction reaction under certain conditions; after crushing and grinding the obtained mixture, mixing suitable amount of magnesium for magnesiothermic reduction and deoxidation; and carrying out acid-leaching, filtering, rinsing and drying for a magnesiothermic reduction product, and thus obtaining pure metal chromium powder. Compared with other methods, the method has the advantages that as vacuum carbon thermal reduction is used, the cost of the raw materials is low; and the process of magnesiothermic reduction has little pollution to metal.

Description

technical field [0001] The invention belongs to the field of ferrous metallurgy, and discloses a method for preparing metallic chromium powder by reducing chromium oxide in a two-step reduction method, and particularly relates to the use of carbonaceous reducing agent, chromium oxide (Cr 2 o 3 ) and a method for producing chromium powder from magnesium metal. Background technique [0002] Metal chromium is a silver-white black metal, hard and brittle, with good corrosion resistance; it is an inactive metal, stable to oxygen and water vapor at room temperature. Chromium is widely used in metallurgy, chemical industry, cast iron, refractory and high-end technology and other fields. But at present, the preparation of metal chromium in industrial production all comes from the crushing and fine grinding of metal chromium blocks and ingots. The traditional chromium metallurgy methods are aluminothermic reduction and electrolysis. The former has a low chromium recovery rate of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/02C22B5/10C22B5/04C22B34/32
CPCC22B1/02C22B1/24C22B5/04C22B5/10C22B5/18C22B34/32
Inventor 张国华汪宇
Owner 鑫沣电子科技(常州)有限公司