Method for preparing arborization fine copper powder in electrolysis mode

Abstract

The invention relates to a method for preparing arborization fine copper powder in an electrolysis mode and belongs to the technical field of preparing nonferrous metal hydrometallurgy and metal powder materials. Firstly, choline chloride and urea are used for preparing eutecticevaporate solvent type ionic liquid, an additive is added into the eutecticevaporate solvent type ionic liquid and an electrolyte is prepared; pure copper serving as an anode and a titanium sheet serving a cathode are added into the obtained electrolyte to be electrolyzed for 30-120 minutes, namely arborization fine copper powder is obtained on the cathode; the obtained arborization fine copper powder is taken off the cathode, cleaned and dried through vacuum and arborization fine copper powder with the granularity ranging from 1-10 microns is obtained. By means of the method for preparing the arborization fine copper powder in the electrolysis mode, cuprous oxide does not need to be added into the ionic liquid, the arborization fine copper powder can be obtained through direct electrolysis, a reagent and the technology are simpler and the current efficiency is high in the electrolytic process.

Description

technical field [0001] The invention relates to a method for electrolytically preparing dendritic fine copper powder, which belongs to the technical field of nonferrous metal hydrometallurgy and metal powder material preparation. Background technique [0002] Copper powder is an indispensable and irreplaceable metal powder material in the fields of automobile, aerospace, machinery, chemical industry, energy and 3C industry. Fine or ultra-fine copper powder has the characteristics of thermal conductivity, electrical conductivity, corrosion resistance, and non-magnetic properties of metallic copper, and also has the characteristics of many nanomaterials. Since the 1980s, copper powder has been extended from metal materials to functional materials, playing an increasingly important role in various fields. [0003] Copper powder preparation methods are roughly divided into three categories: physical method, liquid-phase chemical reduction method and electrolysis method. Physica...

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Problems solved by technology

[0004] The patent application number is "200910218343.4", which provides an electrolyte for preparing fine copper powder and its use method. In this method, a mixed solution of copper sulfate, phosphoric acid, gelatin and benzotriazole is used as the electrolyte, and the temperature is 300-800A / m 2 Under the high current density, fine copper powder with a particle size of 2.5-7.5 μm can be prepared by electrolysis, but the electrolyte of this method is complicated, the current efficiency is 17%-45%, and the power consumption is generally higher than 15000kW·h / t copper powder Cao Xiaoguo and others use cuprous oxide as a raw material, take aminoacetic acid or aminopropionic acid as an accelerator, cetyltrimethylammonium bromide, etc. as a dispersant, then add a reducing agent hydrazine solution, and reduce to obtain copper powder

This method has complex raw materials, many steps, and hydrazine is highly toxic; in the article "Electrochemical Preparation of Nano-copper in Choline Chloride Ionic Liquid" published by Li Hui et al., choline chloride and urea are configured into ionic liquid , then add cuprous oxide to the ionic liquid, use the copper sheet as the anode and the platinum wire as the cathode to obtain nano-scale copper powder, but in this method, it is necessary to add cuprous oxide to the ionic liquid, except that the anode copper is dissolved in the electrolyte , it is necessary to add copper ions to deposit copper powder, and the reagents are more complex, resulting in relatively high cost

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