Method for recycling Au from electronic components of waste mobile phone

Abstract

The invention discloses a method for recycling Au from electronic components of a waste mobile phone. The method comprises the steps of (1) carrying out mechanical crushing on the electronic components of the waste mobile phone into 100 mesh or above; (2) separating non-metallic materials from Pd-containing metallic materials, and grinding the metallic materials into 100 mesh or above; (3) putting metal Au-containing powder into an HCl-CuCl2-NaClO-containging reactor with temperature control and mechanical stirring functions, and leaching Au to obtain an Au-containing solution; (4) carrying out Au extraction on the Au-containing solution through adopting a DBC-sulfonated kerosene system, so as to obtain an enriched Au-containing organic solution; and (5) reducing Au from the Au-containing organic solution through adopting oxalic acid, so as to obtain sponge gold. The method has the characteristics of high efficiency, environmental protection, high technological adaptability, high comprehensive resource utilization rate, wide application prospect, and the like, the pollution problem of strong acid acidification recovery is solved, and remarkable economic, environmental and social benefits can be created.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of secondary resources, and in particular relates to an efficient and environmentally friendly method for extracting gold from waste mobile phone electronic components. Background technique [0002] A large amount of electronic waste is generated globally every year, and electronic waste (WEEE) is one of the fastest growing wastes in today's society. The innovation of science and technology and the rapid expansion of the market accelerate the replacement of electronic products, resulting in the rapid growth of electronic waste. In EU countries, about 8 million tons of e-waste are generated every year, and about 50 million tons of e-waste is generated globally every year. The average annual growth rate is 3-6%, which is the fastest growing garbage. Since the launch of mobile communication services in 1987, the penetration rate of mobile phones in my country has increased year by...

AI Technical Summary

Problems solved by technology

At present, about 100 million waste mobile phones are eliminated every year in the country, and the recycling rate is less than 1%.

[0010] The thiourea gold leaching method has the following disadvantages: thiourea is easy to decompose, so that the consumption of thiourea is too large; thiourea is relatively expensive, and its economic benefits are not as good as the cyanide method; the thiourea method is not suitable for treating ores with more alkaline gangue ; The process of recovering gold from precious liquid is not as mature and simple as the zinc powder replacement process; gold immersion in acidic medium is easy to corrode equipment

However, the chlorination method also has some disadvantages: when dealing with sulfide ore, part of the sulfide is dissolved, which complicates the subsequent treatment process; 2 The production environment is poor and the equipment is severely corroded; Cl 2 Too much consumption

[0020] 1. Although the cyanidation gold leaching process is very mature, it is no longer suitable for use as a gold leaching substance due to the extreme toxicity of cyanide

[0021] 2. The promotion of the thiourea method is restricted by many factors, such as: high price, large consumption, and immature technology for recovering gold from leachate

Although thiourea is less toxic than cyanide, it has been found in recent years that thiourea may cause cancer

[0022] 3. The main problem of the thiosulfate method is that the gold leaching rate is slow and the reagent consumption is large, resulting in high cost. From an economical point of view, the amount of thiosulfate must be minimized and recycled as much as possible, but hard to do

[0023] 4. The halogen and its compound method has a good effect on the leaching of gold, but the chloride method uses Cl 2 It has great impact on the environment and serious corrosion on equipment; the bromination method and iodination method are still under study

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