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Method for extracting gold, silver, platinum and palladium from electronic waste

An electronic waste, gold and silver technology, applied in the field of waste resource utilization, can solve problems such as lead vapor environment and human injury, and achieve the effects of reducing environmental damage, reducing costs, and high separation rate

Inactive Publication Date: 2015-12-09
CHENGDU YUYA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only because lead-containing substances are used as the precious metal collector at high temperature, the lead vapor produced will cause great harm to the environment and the human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for extracting gold, silver, platinum and palladium in electronic waste comprises the following steps:

[0030] (1) Pretreatment, the electronic waste is manually disassembled, crushed, and then subjected to hydraulic separation, magnetic separation to obtain metal enrichment, and oxidation roasting to obtain roasted material;

[0031] (2) pickling, add the roasted material to sulfuric acid solution, add oxidant at the same time, react at 85°C for 4 hours, filter to obtain copper-containing filtrate and precious metal enrichment;

[0032] (3) High-pressure chlorine gas leaching, adding the precious metal enrichment to the acid solution in the autoclave, and then introducing chlorine gas, at a temperature of 190°C, a pressure of 0.3Mpa, and a reaction time of 5 hours, to obtain gold, platinum, and palladium. filtrate and filter residue containing silver;

[0033] (4) Extraction and separation of gold, mixing the filtrate containing gold, platinum and palladiu...

Embodiment 2

[0044] The method for extracting gold, silver, platinum and palladium in electronic waste comprises the following steps:

[0045] (1) Pretreatment, the electronic waste is manually disassembled, crushed, and then subjected to hydraulic separation, magnetic separation to obtain metal enrichment, and oxidation roasting to obtain roasted material;

[0046] (2) pickling, add the roasted material to sulfuric acid solution, and add oxidant at the same time, react at 95°C for 4 hours, filter to obtain copper-containing filtrate and precious metal enrichment;

[0047] (3) High-pressure chlorine gas leaching, adding the precious metal enrichment to the acid solution in the autoclave, and then introducing chlorine gas, at a temperature of 195°C, a pressure of 0.45Mpa, and a reaction time of 8 hours, to obtain gold, platinum, and palladium. filtrate and filter residue containing silver;

[0048] (4) Extract and separate gold, mix the filtrate containing gold, platinum and palladium with...

Embodiment 3

[0059] The method for extracting gold, silver, platinum and palladium in electronic waste comprises the following steps:

[0060] (1) Pretreatment, the electronic waste is manually disassembled, crushed, and then subjected to hydraulic separation, magnetic separation to obtain metal enrichment, and oxidation roasting to obtain roasted material;

[0061] (2) pickling, add the roasted material to sulfuric acid solution, add oxidant at the same time, react at 75°C for 2 hours, filter to obtain copper-containing filtrate and precious metal enrichment;

[0062] (3) High-pressure chlorine gas leaching, adding the precious metal enrichment to the acid solution in the autoclave, and then introducing chlorine gas, at a temperature of 165°C, a pressure of 0.4Mpa, and a reaction time of 8 hours, to obtain gold, platinum, and palladium. filtrate and filter residue containing silver;

[0063] (4) Extract and separate gold, mix the filtrate containing gold, platinum and palladium with the ...

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Abstract

The invention relates to a method for extracting gold, silver, platinum and palladium from electronic waste and belongs to the field of resource utilization of the waste. The method comprises the following steps: gathering metals by using pretreatment, carrying out acid pickling and gathering precious metals, leaching the precious metals by using high-pressure chlorine gas, leaching gold, platinum and palladium for one step, extracting, separating and extracting gold, carrying out chemical precipitation, separating and extracting platinum and palladium, and extracting silver by using an ammoniation method. Through the method for extracting gold, silver, platinum and palladium from the electronic waste, the resource utilization of the electronic waste can be implemented; the extraction of gold, silver, platinum and palladium in the electronic waste can be implemented; the gold, silver, platinum and palladium are high in recovery rate, low in cost, short in process, few in environment hazards and low in yield of waste water and waste gas.

Description

technical field [0001] The invention relates to a method for extracting gold, silver, platinum and palladium from electronic waste, and belongs to the field of resource utilization of waste. Background technique [0002] my country has become the world's largest producer of electronic products and e-waste. The disposal of electronic waste is an urgent problem to be solved in our country. Printed circuit board (PCB for short) is an important part of electronic products. Its composition includes organic substrates and electronic components containing high-grade metals assembled on the substrates. The main metal components are: Cu, Fe, Sn , Ni, Pb, Zn, Sb, Au, Ag, Pd, etc., its recovery value is much higher than that of general municipal waste, and it is an important "urban mine". If discarded circuit boards cannot be effectively disposed of, it will not only be a great waste of resources, but the heavy metals in them will also pollute the environment. [0003] For example, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 向红先
Owner CHENGDU YUYA TECH
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