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Leaching method of gold and copper in gold-contained electronic waste

A technology of electronic waste and leaching solution, which is applied in the field of recycling and industrial waste treatment, can solve the problems affecting the gold leaching rate, the extraction solution is not easy to handle, and environmental pollution, etc., and achieve high leaching rate and high degree of resource utilization , The cleaning effect of the treatment process

Inactive Publication Date: 2015-09-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In this method, organic matter is used to extract gold, and toxic and harmful substances will be produced during the extraction process, and the extract is not easy to handle, which will cause secondary pollution; Aqua regia is used to treat the crushed electronic waste, and volatile substances will be generated during the treatment and evaporation process. Inert gas substances, causing environmental pollution; and copper was not leached during the gold extraction process, which affected the gold leaching rate

Method used

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  • Leaching method of gold and copper in gold-contained electronic waste

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Embodiment 1

[0030]Put gold-containing waste circuit boards into the shearing and crushing device for closed crushing treatment. The particle size of the crushed particles is 1.49mm, and the crushed circuit board particles are collected; then the crushed circuit board particles are transported into the RetschMM400 mixing ball mill After ball milling, the particle size is 0.64mm; afterward, the circuit board powder obtained by ball milling is subjected to controlled potential copper immersion, and a sulfuric acid solution with a concentration of 150g / L is added at a solid-to-liquid ratio of 1:8, and the reaction temperature is controlled. The temperature is 80°C and the temperature is kept constant. The potential of the solution system is maintained between 400-600mV by controlling the amount of sodium chlorate added. The leaching time is 8h. After filtering, copper-rich solution and copper leaching slag are obtained respectively. The copper leaching rate 83.25%; finally, after drying the co...

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Abstract

The invention discloses a leaching method of gold and copper in a gold-contained electronic waste. The gold-contained electronic waste is crushed, and the particle size of crushed particles is not more than 2 mm; then, the ball-milling treatment is performed, and the particle size is not more than 1 mm after the ball-milling treatment; powder obtained by the ball-milling treatment is added in sulfuric acid solution with a concentration of 130-170 g / L for copper leaching to obtain copper-enriched solution and copper leaching slag; and finally, the chlorination gold leaching is performed for the copper leaching slag to obtain gold-enriched solution. The method realizes the separation of copper and gold; the obtained copper-enriched solution and gold-enriched solution can be deeply treated to obtain gold and copper simple substances; and in the separation process, such other metals as lead and tin can be separated through controlling the redox potential.

Description

technical field [0001] The invention relates to a method for leaching gold and copper in gold-containing electronic waste, which is a method for separating and leaching gold and copper in gold-containing electronic waste with high efficiency. The invention belongs to the field of industrial waste treatment and recycling in the technical field of environmental protection. Background technique [0002] Electronic waste is known as "urban mine", mainly including old computers, mobile phones and other communication equipment, televisions, refrigerators, air conditioners, washing machines and other household appliances and other electronic instruments that are discarded in production and life. Electronic waste contains gold, copper, aluminum and other metals with high recycling value. Hazardous treatment is of great significance. The total amount of used circuit boards accounts for about 4% of all electronic waste. Circuit boards usually contain 40% metal, the highest content ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCY02P10/20
Inventor 许振明鲁妍
Owner SHANGHAI JIAO TONG UNIV
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