Method for preparing high performance metallic nickel powder using reoxidation process

A technology of secondary oxidation and metal nickel powder, which is applied in the field of fine nickel powder particles, can solve the problems of coarse powder particles, coarse particles, and difficult to meet market demand, etc., achieve low reduction temperature, inhibit grain growth, and low cost Effect

Inactive Publication Date: 2005-04-06
长沙市维优金属材料有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

With the increasingly widespread industrial application of nickel powder, the demand for fine-grained or ultra-fine-grained nickel powder in various industries is increasing. However, the nickel powder prepared by the traditional redox method usually has coarse powder particles, which are difficult to obtain. To meet the needs of this broad market

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  • Method for preparing high performance metallic nickel powder using reoxidation process
  • Method for preparing high performance metallic nickel powder using reoxidation process

Examples

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Effect test

Embodiment 1

[0018] A dynamic rotary oxidation furnace is used to continuously oxidize the nickel foam raw material, the oxidation temperature is 850°C, the oxidation time is 15min, and the rotation speed of the oxidation furnace is 25rpm. After the primary oxidation, the oxidized product is crushed with a multi-stage shear crusher, the crushing time is 25 minutes, and the crushing stage is 2 stages. Subsequently, the sheared and crushed product was subjected to secondary oxidation. The equipment used was a dynamic rotary oxidation furnace with an oxidation temperature of 870° C., an oxidation time of 15 minutes, and an oxidation furnace rotation rate of 40 rpm. The secondary oxidized nickel oxide powder is subjected to three-stage reduction treatment in a horizontal continuous reduction furnace. The three-stage reduction temperatures are 450°C, 470°C, and 520°C respectively, and the reduction time of each stage is 15 minutes. Finally, two metal nickel powders with different particle size ...

Embodiment 2

[0020] A dynamic rotary oxidation furnace is used to continuously oxidize the nickel foam raw material, the oxidation temperature is 900°C, the oxidation time is 10min, and the rotation speed of the oxidation furnace is 40rpm. After the primary oxidation, the oxidized product is crushed with a multi-stage shear crusher, the crushing time is 30 minutes, and the crushing stages are 3 stages. Subsequently, the sheared and crushed product was subjected to secondary oxidation. The equipment used was a dynamic rotary oxidation furnace, the oxidation temperature was 870° C., the oxidation time was 15 minutes, and the rotation rate of the oxidation furnace was 50 rpm. The secondary oxidized nickel oxide powder is subjected to a three-stage reduction treatment using a horizontal continuous reduction furnace. The three-stage reduction temperatures are 470°C, 530°C, and 600°C respectively, and the reduction time of each stage is 20 minutes. Finally, several metal nickel powders in differ...

Embodiment 3

[0022] A dynamic rotary oxidation furnace is used to continuously oxidize the nickel foam raw material, the oxidation temperature is 950°C, the oxidation time is 30min, and the rotation speed of the oxidation furnace is 70rpm. After the primary oxidation, the oxidized product is crushed with a multi-stage shear crusher, the crushing time is 35 minutes, and the crushing stages are 4 stages. Subsequently, the sheared and crushed product was subjected to secondary oxidation. The equipment used was a dynamic rotary oxidation furnace, the oxidation temperature was 880°C, the oxidation time was 20 minutes, and the rotation rate of the oxidation furnace was 70 rpm. The secondary oxidized nickel oxide powder is subjected to three-stage reduction treatment in a horizontal continuous reduction furnace. The three-stage reduction temperatures are 480°C, 570°C, and 630°C respectively, and the reduction time of each stage is 30 minutes. The final purity is 480°C, 570°C, 630°C, and the reduc...

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Abstract

The invention relates to a method which is adopted the re-oxidation technology to prepare the metal 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. 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 reduction in stages after the re-oxidation 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 refining nickel powder particles, in particular to a low-cost and pollution-free method for refining nickel powder particles. 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 organic substances are prod...

Claims

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Application Information

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IPC IPC(8): B22F9/22
Inventor 匡怡新贺跃辉
Owner 长沙市维优金属材料有限公司
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