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Electrochlorination extraction method of gold in gold-containing materials

An extraction method, electrochlorination technology, which is applied in the fields of pollution control and resource recycling, can solve the problems of long process, achieve the effects of less chemical reagents, selective extraction, and no secondary pollution discharge

Active Publication Date: 2022-07-15
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The beneficial effect of the present invention: compared with the prior art, the beneficial effect of the present invention is that in one reaction system, the dissolution of gold and the extraction of elemental gold are realized, which solves the problem of long process in the prior art; In the chemical system, the complexation of chloride ions is fully utilized to achieve a certain selective extraction of gold and other metals; in addition, the method uses less chemical reagents, the process is environmentally friendly, and there is no secondary pollution discharge, which has significant environmental and environmental benefits. economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The electrochlorination extraction method of gold in gold-containing material comprises the following steps:

[0010] 1. Manually cut out the golden fingers of the waste computer memory stick, and cut it to 3 mm in length and 3 mm in width, and use it as the raw material for the next experiment;

[0011] 2. Weigh 0.5 g of raw materials into the anode chamber of the electrochemical reactor, and add 250 mL of sodium chloride solution with a concentration of 0.7 mol / L to conduct electrolysis; the electrolysis conditions are as follows: the graphite electrode plate is the anode, and the copper electrode plate is Cathode with a current density of 0.0774 A / cm 2 , the temperature is 60 °C, and the electrolysis is performed for 5 h;

[0012] 3. After the electrolysis reaction is completed, filter the electrolyte to a constant volume; digest the anode residue with aqua regia, and make the digestion solution constant; collect the sediment on the cathode plate, wash and dry;

[...

Embodiment 2

[0015] The electrochlorination extraction method of gold in gold-containing material comprises the following steps:

[0016] 1. Cut the golden fingers of the waste computer memory stick by hand, and cut it to 5 mm in length and 3 mm in width, and use it as the raw material for the next experiment;

[0017] 2. Weigh 0.5 g of raw material and put it into the anode chamber of the electrochemical reactor, and at the same time add 250 mL of sodium chloride solution with a concentration of 1.90 mol / L for electrolysis; the electrolysis conditions are as follows: the graphite electrode plate is the anode, and the copper electrode plate is Cathode with a current density of 0.0774 A / cm 2 , the temperature is 60 °C, and the electrolysis is performed for 5 h;

[0018] 3. After the electrolysis reaction is completed, filter the electrolyte to a constant volume; digest the anode residue with aqua regia, and make the digestion solution constant; collect the sediment on the cathode plate, wa...

Embodiment 3

[0021] The electrochlorination extraction method of gold in gold-containing material comprises the following steps:

[0022] 1. Cut the golden fingers of the waste computer memory sticks by hand, and crush the cut golden fingers to a particle size of less than 1 mm, which is used as the raw material for the next experiment;

[0023] 2. Weigh 0.5g of raw material and put it into the anode chamber of the electrochemical reactor, and simultaneously add 250 mL of sodium chloride solution with a concentration of 1.30 mol / L to conduct electrolysis; the electrolysis conditions are as follows: the graphite electrode plate is the anode, and the copper plate electrode plate is Cathode with a current density of 0.0645 A / cm 2 , the temperature was 50 °C, and the electrolysis was performed for 4 h;

[0024] 3. After the electrolysis reaction is completed, filter the electrolyte to a constant volume; digest the anode residue with aqua regia, and make the digestion solution constant; collec...

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PUM

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Abstract

An electrochlorination extraction method of gold in a gold-containing material, including anodic dissolution and cathodic deposition, which are completed in the same reactor. The gold-containing material is put into the electrochemical reactor containing the sodium chloride concentration of 0.1~3 mol / L electrolyte in the form of flakes, powders or granules, and the control reaction temperature is 25~99 ° C, and the current density is 0.01~3 A / cm 2 , the reaction time is 1-6 h; after the electrolysis is completed, the deposits in the cathode chamber and the cathode plate are collected, washed and dried to obtain gold powder. The invention has the remarkable advantages of high gold extraction efficiency, less chemical reagent consumption, clean process, simple operation, short flow and the like.

Description

technical field [0001] The invention relates to an electrochlorination extraction process of gold in gold-containing materials, and is an efficient enrichment and extraction method for gold in gold-containing materials. It belongs to the field of resource recycling and pollution control. Background technique [0002] As a rare precious metal, the demand for gold is still rising. Currently, the annual global demand for gold is about 4,000 tons, mainly for national storage and product manufacturing, especially for jewelry and electronics. Gold mining is a source of great wealth, but they are not always popular with local residents. On the one hand, after thousands of years of mining, almost all the gold that is easy to mine has been exhausted; and mining the more difficult deposits means harsher mining conditions, more dangerous mining work, and higher costs. On the other hand, gold mining is even considered a "dirty business" due to the use of large amounts of toxic and ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/20C25C7/06
CPCC25C1/20C25C7/06
Inventor 王建波鲁妍曾玻
Owner SOUTHWEAT UNIV OF SCI & TECH
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