Preparation method of ultrafine spherical copper powder

A technology of ultra-fine spherical copper powder and copper powder, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of large amount of additives, poor dispersion, and unsuitability for large-scale industrial production, and achieve reduced size, uniform shape and quality , Conducive to the effect of ecological environment protection

Active Publication Date: 2019-01-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The process of the above method is relatively complicated, the cost of raw material sources is high, the amount of additives required is large, the impact on the environment is large, and it is not suitable for large-scale industrial production. Therefore, it is necessary to develop a new process for preparing ultrafine copper powder
[0008] CN105220181A discloses a process for preparing high-purity ultra-fine copper powder based on electrochemical method to recover copper from waste circuit boards. The process uses copper sulfate-sulfuric acid solution as electrolyte, waste circuit boards as anode, industrial titanium plate / network or stainless steel plate / net as the cathode, electrolytic deposition is carried out by direct current or pulse current, and at the same time, sodium lauryl sulfate and Tween 80 are used as additives to change the shape of copper powder. This process can realize efficient recovery of copper, but the obtained ultrafine copper powder Uneven mass distribution, poor dispersion

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  • Preparation method of ultrafine spherical copper powder
  • Preparation method of ultrafine spherical copper powder
  • Preparation method of ultrafine spherical copper powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Use the electroplating factory plating piece washing wastewater as the copper-containing solution, feed nitrogen into the copper-containing solution for 30 minutes, adjust the pH of the copper-containing solution to 1 after the ventilation is completed, and then add potassium ferrocyanide as the electrolyte, The concentration of potassium ferrocyanide in the electrolyte is 0.5g / L;

[0052] (2) The electrolytic solution obtained in step (1) is passed into the swirl electrolyzer, and 316 stainless steel is used as the working electrode, and the working electrode area is 200cm 2 , the coated titanium is the counter electrode, the shapes of the working electrode and the counter electrode are rectangular plate and column respectively, the stirring rate is controlled to 100r / min, and the current density is 100A / m 2 , the electrolysis temperature is 35°C, and the electrolysis is carried out for 2 hours. After the electrolysis is completed, copper powder is obtained on the ...

Embodiment 2

[0056] (1) Use the pickling water from the iron and steel plant as the copper-containing solution, feed nitrogen into the copper-containing solution for 15 minutes, adjust the pH of the copper-containing solution to 1 after the aeration, and then add potassium ferrocyanide as the electrolyte, electrolyze The concentration of potassium ferrocyanide in the liquid is 0.8g / L;

[0057] (2) The electrolyte obtained in step (1) is passed into the swirl electrolyzer, and 316 stainless steel is used as the working electrode, and the working electrode area is 300cm 2 , the coated titanium is the counter electrode, the shapes of the working electrode and the counter electrode are rectangular plate and column respectively, the stirring rate is controlled to 150r / min, and the current density is 150A / m 2 , the electrolysis temperature is 35°C, and the electrolysis is carried out for 2 hours. After the electrolysis is completed, copper powder is obtained on the working electrode;

[0058] (...

Embodiment 3

[0061] (1) Use the tailings drainage of the concentrator as the copper-containing solution, feed argon into the copper-containing solution for 60 minutes, adjust the pH of the copper-containing solution to 2 after the aeration, and then add potassium ferrocyanide as the electrolyte, The concentration of potassium ferrocyanide in the electrolyte is 1.1g / L;

[0062] (2) The electrolyte that step (1) obtains is passed into the cyclone electrolyzer, uses 316 stainless steel as working electrode, and working electrode area is 350cm 2 , the coated titanium is the counter electrode, the shapes of the working electrode and the counter electrode are rectangular plate and column respectively, the stirring rate is controlled to 200r / min, and the current density is 200A / m 2 , the electrolysis temperature is 20°C, and the electrolysis is carried out for 2.5 hours. After the electrolysis is completed, copper powder is obtained on the working electrode;

[0063] (3) The working electrode is...

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Abstract

The invention relates to a preparation method of ultrafine spherical copper powder. The method comprises the following steps: taking a copper-containing solution with potassium ferrocyanide as an electrolyte, performing electrolysis in an electrochemical device, and obtaining copper powder at a working electrode after electrolysis is completed. The electrochemical method can be used for recoveringall copper-containing solutions, especially low-concentration copper-containing wastewater produced in industry, and the ecological environment is protected. The additive potassium ferrocyanide is added in the process of preparing the ultrafine copper powder by electrolysis, morphology and size of the metallic copper powder obtained by electrolysis recovery can be changed, and the prepared ultrafine copper powder has particle diameter of 1-5 mu m and has spherical appearance and uniform particle size and mass distribution. The whole operation flow is simple, the production cost is low, and the method has good economic benefits and application prospect.

Description

technical field [0001] The invention relates to the field of recovery of valuable metals, in particular to a method for preparing ultrafine spherical copper powder. Background technique [0002] Ultrafine copper powder is an indispensable basic raw material with good conductivity and high strength. Due to its excellent electrical properties, it is widely used in conductive adhesives, conductive coatings and electrode materials. In recent years, it has been found that it can be used to make catalysts, lubricant additives, and even treat osteoporosis and fractures. [0003] At present, as a cheap and efficient material, ultrafine copper powder is widely used in metallurgy, catalysis, conductive paste and other fields. The preparation methods of ultrafine copper powder can be roughly divided into three categories of physical, mechanical and chemical methods, including electrolysis, atomization, chemical disproportionation, liquid phase reduction, etc., all of which can be prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02C25C7/06C25C7/02
CPCC25C5/02C25C7/02C25C7/06
Inventor 金伟娄文博郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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