Method for recovering gold and silver from waste circuit boards

A technology for recycling used circuit boards and gold, applied in the field of gold and silver recovery, can solve the problems of unstable gold leaching agent, serious pollution and high cost, and achieve the effects of easy industrialization, efficient recovery and high leaching rate.

Inactive Publication Date: 2012-05-23
TCL奥博(天津)环保发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem to be solved: the present invention aims at the existing technical process of recovering gold and silver from circuit boards, which has the disadvantages of unstable gold leaching agent itself, high cost, high toxicity, and serious pollution, and provides a non-toxic, high-efficiency Method for extracting gold and silver with high production cost and low production cost

Method used

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  • Method for recovering gold and silver from waste circuit boards
  • Method for recovering gold and silver from waste circuit boards

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Using waste circuit boards as raw materials, after pretreatment such as crushing and sorting, the complete separation of metals and non-metals is realized, and non-metals are subjected to conventional recycling treatment, and metal particles and sulfuric acid solution (concentration: 6m / L) are poured into the In the reactor, the solid-to-liquid ratio of the two is 1:8, heated to 75°C, and the oxidant sodium chlorate is added under stirring, the mass ratio of the metal to the oxidant sodium chlorate is 1:0.1, and the reaction continues after the addition of the oxidant After 3 hours, the reacted mixture is filtered, and the filtrate is used to recover copper and other metals by solvent extraction of copper. The solid after solid-liquid separation is the gold and silver leaching raw material. Use hydrochloric acid to adjust the pH of the solution to 1.5, then add chloride, which is sodium chloride, so that the concentration of chloride in the solution is 5M / L, and then add...

Embodiment 2

[0031] Using waste circuit boards as raw materials, after pretreatment such as crushing and sorting, the complete separation of metals and non-metals is realized, and non-metals are subjected to conventional recycling treatment, and metal particles and sulfuric acid solution (concentration: 6m / L) are poured into the In the reactor, the solid-to-liquid ratio of the two is 1:10, heated to 75°C, and the oxidant sodium chlorate is added under stirring, the mass ratio of the metal to the oxidant sodium chlorate is 1:0.15, and the reaction continues after the addition of the oxidant After 2 hours, the reacted mixture is filtered, and the filtrate is used to recover copper and other metals by solvent extraction of copper. The solid after solid-liquid separation is the raw material for leaching gold and silver. Use hydrochloric acid to adjust the pH of the solution to 2, then add chloride, which is sodium chloride, so that the concentration of chloride in the solution is 7M / L, and then...

Embodiment 3

[0036] Using waste circuit boards as raw materials, after pretreatment such as crushing and sorting, the complete separation of metals and non-metals is realized, and non-metals are subjected to conventional recycling treatment, and metal particles and sulfuric acid solution (concentration: 1m / L) are poured into the In the reactor, the solid-to-liquid ratio of the two is 1:3, heated to 70°C, and the oxidant sodium chlorate is added under stirring, the mass ratio of the metal to the oxidant sodium chlorate is 1:0.08, and the reaction continues after the oxidant is added. After 1h, the reacted mixture is filtered, and the filtrate is used to recover copper and other metals by solvent extraction of copper. The solid after solid-liquid separation is the gold and silver immersion raw material. Use hydrochloric acid to adjust the pH of the solution to 1, then add chloride, which is sodium chloride, so that the concentration of chloride in the solution is 4M / L, and then add gold leach...

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Abstract

The invention relates to a method for recovering gold and silver from waste circuit boards which comprises: crushing the circuit boards, separating metal particles, adding sulfuric acid and oxidant to leach base metals from the metal particles, adding strong gold leaching agent BrCl2 into acidic solution which containing sodium chloride to leach gold, absorbing gold-containing solution by active carbon for two times, and desorbing in ethanol solution for two times to recover gold; directly reducing silver-containing filter residue, which is obtained by filtering, with hydrazine hydrate and recovering silver. The method is simple in operation and easy to promote industrially, avoids causing secondary pollution, effectively recover gold and silver from circuit boards, protecting environmentfrom being polluted by directly discarded circuit boards and creates huge social and economic benefit.

Description

technical field [0001] The invention belongs to the field of recycling industrial waste electronic materials, and mainly relates to a method for recovering gold and silver from waste circuit boards. Background technique [0002] With the development of science and technology, the frequency of product updates has accelerated. As the key and most basic component of various electronic and electrical products, printed circuit boards have become one of the main sources of electronic waste. There are many harmful substances and a lot of valuable substances in waste circuit boards. Any inappropriate disposal will not only cause great harm to the environment, but also prevent valuable substances from being recycled, and cannot cater to the development of the current resource-short society, and will bring a heavier load to the environment. On the contrary, Using appropriate recycling technology to recycle circuit boards can not only avoid secondary pollution, but also bring good eco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 王治军周瑞君覃骏刘巍
Owner TCL奥博(天津)环保发展有限公司
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