Electrochlorination extraction method for gold in gold-containing materials

An extraction method, electric chlorination technology, applied in the field of resource recycling and pollution control, can solve the problems of long process, achieve less chemical reagents, no secondary pollution discharge, and significant environmental effects

Active Publication Date: 2020-12-29
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 the gold-containing material comprises the following steps:

[0010] 1. Manually cut off the gold fingers of the waste computer memory sticks, and cut them into lengths of 3 mm and width of 3 mm, and use them as raw materials 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 at the same time 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℃, electrolysis for 5 h;

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

[0...

Embodiment 2

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

[0016] 1. Manually cut off the gold fingers of the waste computer memory sticks, and cut them to a length of 5 mm and a width of 3 mm, and use them as raw materials for the next experiment;

[0017] 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 1.90 mol / L at the same time 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℃, electrolysis for 5 h;

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

...

Embodiment 3

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

[0022] 1. Manually cut off the gold fingers of waste computer memory sticks, and crush the cut gold fingers until the particle size is less than 1 mm, as the raw material for the next experiment;

[0023] 2. Weigh 0.5g of raw materials into the anode chamber of the electrochemical reactor, and add 250 mL of sodium chloride solution with a concentration of 1.30 mol / L at the same time for 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 is 50℃, electrolysis for 4 h;

[0024] 3. After the electrolysis reaction is completed, filter the electrolyte to constant volume; digest the anode residue with aqua regia, and constant volume with the digestion solution; collect the sediment on the cathode plate, wash a...

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Abstract

The invention discloses an electrochlorination extraction method for gold in gold-containing materials. The electrochlorination extraction method comprises an anode dissolution process and a cathode deposition process which are completed in a same reactor. The electrochlorination extraction method comprises the following steps of putting the gold-containing materials into an electrochemical reactor filled with an electrolyte with sodium chloride concentration of 0.1-3mol/L in a sheet, powder or particle form, and controlling the reaction temperature to be 25-99 DEG C, the current density to be0.01-3A/cm2, and the reaction time to be 1-6 hours; and after electrolysis is completed, collecting sediments of a cathode chamber and a cathode plate, washing and drying the sediments, and obtaininggold powder. The method has the remarkable advantages of being high in gold extraction efficiency, low in chemical reagent consumption, clean in process, simple and convenient in operation, short inflow and the like.

Description

technical field [0001] The invention relates to an electrochlorination extraction process of gold in gold-containing materials, which is a method for efficiently enriching and extracting gold in gold-containing materials. It belongs to the field of resource recycling and pollution control. Background technique [0002] As a rare and precious metal, gold's demand is still rising. At present, the annual global demand for gold is about 4,000 tons, which is mainly used for national storage and product manufacturing, especially for the manufacture of jewelry and electronic products. Gold mining is a source of great wealth, but they are not always popular with the local population. On the one hand, after thousands of years of mining, almost all the gold that is easy to mine has been mined; while mining more difficult deposits means that the mining environment is harsher, the mining work is more dangerous, and the cost is higher. On the other hand, gold mining is even considered...

Claims

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Application Information

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Patent Type & Authority Applications(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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