Method for preparation of ultrafine copper powder by waste circuit board copper dissolution-electrodeposition combined method

Abstract

The invention discloses a method for preparation of ultrafine copper powder by a waste circuit board copper dissolution-electrodeposition combined method and belongs to the technical field of electronic waste recycling. Each liter of a copper dissolution electrolyte comprises 0.06-0.8mol of copper sulfate, 0.02-0.1mol of ammonium sulfate, 0.3-3mol of ammonia water, 0-0.5g of an additive and the balance water. Direct voltage of an electrolytic bath is in a range of 2-8v. A cathode zone and an anode zone are separated by a cation exchange membrane. A waste circuit board without paint is put into the anode zone and nitrogen is fed into the cathode zone so that oxygen is removed. At a temperature of 30-70 DEG C, electrolysis is carried out under the condition of magnetic stirring. After electrolysis, copper powder is separated from a cathode by ultrasonic wave and then is subjected to washing, filtration and vacuum drying to form the ultrafine copper powder. Through the waste circuit board as a copper source, the ultrafine copper powder is obtained under the optimal conditions. The ultrafine copper powder has the average particle size of 5.8 microns, uniform particle size distribution, good dispersibility, high purity of 99.9% and a high application value. The method realizes recycle of the electrolyte and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of recycling electronic waste, and provides a method for reclaiming copper in waste electronic circuit boards to obtain superfine copper powder under alkaline conditions by combining copper dissolution and electrodeposition. technical background [0002] With the rapid development of the information industry, the replacement of electronic equipment is accelerating, and the amount of electronic waste is growing at an alarming rate. Among them, the potential value of waste electronic circuit boards is very high, but due to its complex composition, various types, and a large amount of toxic and harmful substances, the technical requirements are relatively high in the process of recycling waste circuit boards to avoid secondary pollution (less money) Jiang et al. Current Situation and Suggestions for Electronic Waste Recycling in my country [J]. Northern Environment. 2013, 29(3): 58-60). Waste circuit boards con...

AI Technical Summary

Problems solved by technology

Its advantage is that the pollution is small, and the metal and non-metal in electronic waste can be comprehensively recycled, but the separation is not complete, and only metal and non-metal can be separated

Wet treatment is mainly for the recovery of precious metals. Due to the simple operation process, low investment and sufficient recovery of precious metals, it has become the main method for many manual workshops to process waste circuit boards, but it is easy to cause environmental pollution.

Images