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Method and device for preparing copper powder by intensified electrolysis

A technology of electrolytic copper powder and copper powder, applied in the direction of electrolytic components, electrolytic process, cells, etc., can solve the problems of low current efficiency, increase of electrolytic cell voltage, power consumption, etc., to reduce production cost, improve economic value, and increase current efficiency effect

Inactive Publication Date: 2009-10-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, electrolytic copper powder production needs to be carried out under the conditions of low copper ion concentration, high acid content electrolyte and high cathodic current density to cause concentration polarization of copper ions on the electrode surface, resulting in the formation of copper powder
The concentration polarization of copper ions will inevitably cause severe hydrogen evolution side reactions on the electrode surface. In this way, a large amount of electric energy will be consumed by hydrogen evolution side reactions during electrolysis of copper powder, resulting in low cathode current efficiency.
Low current efficiency not only greatly reduces the output of copper powder per unit time, but also greatly increases the preparation cost of copper powder
On the other hand, since finer copper powder has higher economic value, in order to obtain ultra-fine copper powder, the most effective way is to increase the current density of electrolytic copper powder, but the increase of current density will greatly reduce the current efficiency, And the voltage of the electrolytic cell increases sharply, thereby further increasing the unit energy consumption of the electrolytic copper powder

Method used

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  • Method and device for preparing copper powder by intensified electrolysis
  • Method and device for preparing copper powder by intensified electrolysis
  • Method and device for preparing copper powder by intensified electrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Prepare an electrolyte with a copper sulfate concentration of 10g / l, a sulfuric acid concentration of 9.8g / l, and a sodium dodecylbenzenesulfonate concentration of 1.5g / l, using a copper plate as the anode, a nickel sheet as the cathode, and a current density of 2000A / m 2 , Under the condition of normal gravity (gravity coefficient is 1), the electrolysis of copper powder is carried out, and the electrolysis time is 75min. After the electrolysis, the copper powder is collected, washed with water, anti-oxidation treatment, washed with water, and dried in sequence. The average particle size of the obtained copper powder is 20.1 μm, and the electrolytic current efficiency is 55.7%.

Embodiment 2

[0025] Prepare an electrolyte with a copper sulfate concentration of 10g / l, a sulfuric acid concentration of 9.8g / l, and a sodium dodecylbenzenesulfonate concentration of 1.5g / l, using a copper plate as the anode, a nickel sheet as the cathode, and a current density of 2000A / m 2 , Under the condition that the gravity coefficient is 101, the copper powder is electrolyzed, and the electrolysis time is 75min. After the electrolysis, the copper powder is collected, washed with water, anti-oxidation treatment, washed with water, and dried in sequence. The average particle size of the obtained copper powder is 19.2 μm, and the electrolytic current efficiency is 74.2%.

Embodiment 3

[0027] Prepare an electrolyte with a copper sulfate concentration of 10g / l, a sulfuric acid concentration of 9.8g / l, and a sodium dodecylbenzenesulfonate concentration of 1.5g / l, using a copper plate as the anode, a nickel sheet as the cathode, and a current density of 4000A / m 2 , Under the condition that the gravity coefficient is 101, the copper powder is electrolyzed, and the electrolysis time is 75min. After the electrolysis, the copper powder is collected, washed with water, anti-oxidation treatment, washed with water, and dried in sequence. The average particle size of the obtained copper powder is 14.4 μm, and the electrolytic current efficiency is 68.1%.

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Abstract

The invention provides a method and a device for preparing copper powder by intensified electrolysis, and belongs to the technical field of metal electrolysis under special conditions. The method adopts hypergravity fields to intensify the electrolysis of the copper powder. The hepergravity electrolyzer comprises a centrifuge, an electric signal transmission system, an electrolyic bath system and an electrochemical reaction control system. The hypergravity fields are generated in a test cup by utilizing the rotation of a rotor of the centrifuge, and the copper powder electrolysis reaction is carried out in the high gravity fields; an electrolytic reaction signal is transmitted by a conductive ring of the electric signal transmission system; and the electrolytic copper powder reaction is carried out in the electrolytic bath. The method and the device have the advantages of greatly improving the current efficiency of the electrolytic copper powder and lowering the particle size of the copper powder; moreover, the electrolysis under a high current density is realized, and the particle size of the copper powder is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal electrolysis reaction under special conditions, and in particular relates to a method and a device for preparing copper powder by intensified electrolysis. Background technique [0002] Copper powder has a wide range of applications in powder metallurgy, conductive additives and diamond tools. The preparation methods of copper powder mainly include chemical reduction method, atomization method and electrolysis method, etc. Among them, the copper powder produced by electrolysis method has the advantages of high purity, large specific surface area, good compressibility and formability, etc., and is the main production method of copper powder at present. method. Patent CN1686645A discloses a method of electrolyzing copper powder by pulse method, which can obtain copper powder with fine particle size. Patent CN101007354A uses an ultrasonic membrane electrolysis device to directly electrolyze copper co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02C25C7/00
Inventor 王明涌王志郭占成
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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