Method for preparing high performance nickel powder using shearing and breaking process

Abstract

The invention relates to a method which is adopted the shearing crushing technology to prepare for producing the nickel powder with high performance. It is gained the oxidation product of the metal nickel packed by the brittle nickel oxide after the foamed metal nickel raw material is conducted the dynamic gyration oxidation treatment. The oxidation product is conducted multistage shearing crushing by the multistage shearing crusher, and generally the number of stages is from one stage to five stages. Then the crushed powder is conducted the re-oxidation treatment to gain the nickel oxide powder with fine grain. The nickel oxide powder is conducted reduction treatment in stages by cracked ammonia. Thus the high quality metal nickel powder with high purity, fine grain, and small loosing ratio is produced. The technology can be widely applied to all of the metal powder preparations adopted the oxidation reduction method. The advantage of The invention discloses that the high quality metal nickel powder with fine grain can be prepared by, the re-oxidation and the later reduction in stages after the shearing crushing of the oxidation intermediate product. The produced metal nickel powder can be widely applied to the sintered metal product (hard alloy, diamond tool, nickel iron alloy product, nickel base product) stainless steel product, battery, and chemical industry product, and so on. The features of the invention are that the non contaminant is discharged; it is good for the environmental protection; the process flow and the cost are reduced.

Description

Technical field:

[0001] The invention relates to a method for preparing nickel powder, in particular to a method for preparing nickel powder with a low-cost and pollution-free refinement technology. Background technique:

[0002] Metal nickel powder is widely used in powder metallurgy products (tungsten carbide, diamond tools, nickel-iron alloy products, nickel-based products, etc.), stainless steel products, batteries and chemical products, etc. At present, the production methods used to prepare metal nickel powder mainly include redox method, electrolysis method, atomization method, and carbonyl method. Among them, the appearance of the nickel powder prepared by the electrolytic method is dendritic, the powder particles themselves have a large internal stress, and the powder compaction is poor; the nickel powder prepared by the atomization method has a high oxygen content; the nickel powder powder particles prepared by the carbonyl method Small, but toxic inorganic substa...

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