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Method for preparing silver powder by using copper material

A technology for copper and silver powder, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of unstable quality of copper powder and silver powder, and achieve the effect of stable quality and elimination of influence.

Pending Publication Date: 2022-02-25
温州伟达贵金属粉体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, copper powder is easy to oxidize in the air environment. In order to prevent its oxidation, it is necessary to add a protective agent on the surface of the copper powder. After the production process of the copper powder with the protective agent, it is found that the activity of the copper powder is not enough, which will affect the quality of the silver powder in the replacement reaction process. If copper If there is no protective agent on the surface of the powder, the surface of the copper powder will be blackened and oxidized, and the quality of the copper powder will be unstable, which will eventually lead to unstable quality of the silver powder.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Put a rod-shaped copper material with a diameter of 10mm and a length of 100mm, a total of 10 sections into the container

[0024] (2) Add a total of 1kg of 316L stainless steel magnetic steel needles with a diameter of 0.2mm into the container;

[0025] (3) Add 5L of silver nitrate solution, with a silver content of 0.1Kg / L, into the container, and simultaneously turn on the magnetic polishing function and ultrasonic dispersion function of the container;

[0026] (4) When it is observed that the reaction solution is blue and bright, take out 10ml of the solution and add sodium chloride solution to observe whether there is white precipitation. When there is no white precipitation, the replacement reaction is over, take out the rod-shaped copper material in the container, and turn off the magnetic polishing function of the container And ultrasonic dispersion function, after standing for 10 minutes, draw out the blue transparent copper nitrate solution in the containe...

Embodiment 2

[0031] (1) Add a rod-shaped copper material with a diameter of 30mm and a length of 500mm, a total of 10 sections into the container

[0032] (2) Add a total of 3kg of magnetic steel needles made of 316L stainless steel and 0.1mm in diameter into the container;

[0033] (3) Add 350L of silver nitrate solution, with a silver content of 0.15Kg / L, into the container, and simultaneously turn on the magnetic polishing function and ultrasonic dispersion function of the container;

[0034] (4) When it is observed that the reaction solution is blue and bright, take out 10ml of the solution and add sodium chloride solution to observe whether there is white precipitation. When there is no white precipitation, the replacement reaction is over, take out the rod-shaped copper material in the container, and turn off the magnetic polishing function of the container And ultrasonic dispersion function, after standing for 10 minutes, draw out the blue transparent copper nitrate solution in the ...

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Abstract

The invention belongs to the technical field of silver powder preparation, and particularly relates to a method for preparing silver powder by using a copper material, and the method comprises the following steps of: carrying out replacement reaction on the copper material and a first solution containing silver ions in a container of magnetic polishing equipment to obtain silver powder, and separating the silver powder obtained through copper material replacement from the surface of the copper material by starting the magnetic polishing function of the magnetic polishing equipment. The method can effectively eliminate the influence of copper powder on replacement of silver powder with copper, so that the prepared silver powder is stable in quality.

Description

technical field [0001] The invention belongs to the technical field of silver powder preparation, and in particular relates to a method for preparing silver powder by utilizing copper material. Background technique [0002] Among the silver-based electrical contact materials, silver is one of the most important raw materials, and when the silver-based electrical contact material products are manufactured by powder metallurgy, silver powder is the most important raw material. The particle size, bulk density, dispersion, and microscopic morphology of silver powder will all affect the performance of silver contact products. [0003] At present, there are many ways to prepare silver powder. The main methods for preparing silver powder in the electrical contact industry are atomization method, chemical method and electrolytic method. Among them, the chemical method can prepare many kinds of silver powder due to its various chemical reaction changes, including nano-scale ultrafine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B03C1/02
CPCB22F9/24B03C1/02
Inventor 周克武夏宗斌代林涛钟民杨昌麟林应涛宋振阳
Owner 温州伟达贵金属粉体材料有限公司