Method for improving performance of metal chromium powder by oxidation-reduction process

Abstract

The invention discloses a method for improving the performance of metal chromium powder by an oxidation-reduction process. A metal chromium plate is first subjected to a purification treatment process, then an oxidation and reduction process is performed, and high-performance metal chromium powder is prepared. The method adopts the metal chromium plate with high purity, and the metal chromium plate is processed by the purification process to obtain foam metal chromium with high porosity and high purity; the foam metal chromium is subjected to dynamic rotary oxidation treatment, and fully oxidized to obtain brittle chromium oxide foam; then foam-shaped chromium oxide is subjected to multi-stage shearing and crushing, and chromium oxide powder of different particle sizes is obtained after grading is performed by a sedimentation method; and the chromium oxide powder is subjected to a graded reduction treatment by decomposing ammonia, and high-quality metal chromium powder with high purity, small crystal particles and a small specific ratio is obtained. The method has the advantages that no pollutant discharge is achieved, environmental protection is facilitated, the process flow is shortened, the cost is reduced, and the production of the high-performance metal chromium powder is ensured. The preparation method produces the high-performance metal chromium powder, and the high-performance metal chromium powder can be widely applied to powder metallurgy products (hard alloys, diamond tools, ferrochrome products, chromium-based product and the like), stainless steel products, batteries, chemical products and the like.

Description

technical field [0001] The invention relates to a preparation method of metal chromium powder. In particular, it relates to a method for improving the performance of metallic chromium powder through an oxidation-reduction process. Background technique [0002] Metal chromium powder is widely used in powder metallurgy products (tungsten carbide, diamond tools, ferrochrome products, chrome-based products, etc.), stainless steel products, batteries and chemical products. At present, the production methods used to prepare metal chromium powder mainly include redox method, electrolysis method, atomization method, carbonyl method and liquid phase reduction method. These preparation methods themselves often have the following disadvantages: 1. The technological process is too complicated, which increases the production cost and is not conducive to market competition; 2. There are intermediate product discharges or toxic substances in the preparation process, which cause environmen...

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Problems solved by technology

These preparation methods themselves often have the following disadvantages: 1. The technological process is too complicated, which increases the production cost and is not conducive to market competition; 2. There are intermediate product discharges or toxic substances in the preparation process, which cause environmental pollution; 3. The prepared Chromium powder often has the disadvantages of high porosity ratio, coarse crystal grains, and low purity, so it is difficult to be well used in the above-mentioned industrial fields.