Three-phase-type oxidoreduction metal chromium powder preparation technology

Abstract

The invention discloses a three-phase-type oxidoreduction metal chromium powder preparation technology, a purification treatment technology is firstly conducted on a metal chromium plate, then an oxidoreduction technology is conducted, and thus high-performance metal chromium powder is prepared. According to the three-phase-type oxidoreduction metal chromium powder preparation technology, the metal chromium plate with high purity is adopted, after purification technology treatment is conduct, and foam metal chromium with high porosity and high purity is obtained; dynamic rotary oxidation treatment is conducted on the foam metal chromium, and fragile chromic oxide foam is obtained after full oxidation is conducted; then the spumescence chromic oxide is cut and crushed in a multistage mode,and chromic oxide powders with different particle sizes are obtained after sedimentation method is adopted to classify; grading reduction treatment is conducted on the chromic oxide powders by using cracked ammonia, and thus the high-quality metal chromium powder with high purity, fine particle size and small loose density is manufactured. The three-phase-type oxidoreduction metal chromium powderpreparation technology has the advantages that no pollutant is discharged, environmental protection is facilitated, the technologic process is shortened, the cost is lowered, and it can be ensured that the high-performance metal chromium powder is manufactured and obtained. The high-performance metal chromium powder manufactured through the preparation method can be widely applied to powder metallurgy products (hard alloys, diamond tools, ferrochrome products, chrome base products 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 three-stage oxidation-reduction process for preparing metal chromium powder. 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 environmental pollution; 3. The prepar...

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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.