Process for extracting gold from low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp via electrodeposition

A low-grade technology that is difficult to treat gold ore, applied in the metallurgical industry, can solve the problems of reduced adsorption capacity of regenerated carbon, difficulty in desorption of gold-loaded carbon, and elevated grade of gold-loaded carbon and copper, so as to achieve low production costs and reduce production costs. And the effect of high investment cost and gold recovery rate

Active Publication Date: 2013-07-10
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large amount of copper will be leached out during the countercurrent washing process of the ammonium cyanide leached pulp, which greatly increases the copper concentration in the leaching solution entering the carbon adsorption system, resulting in a sharp increase in the grade of gold-loaded carbon copper, resulting in a decrease in the gold adsorption rate. Adverse effects such as difficult desorption of gold-loaded carbon and gold, and decreased adsorption capacity of regenerated carbon

Method used

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  • Process for extracting gold from low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp via electrodeposition

Examples

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Effect test

Embodiment 1

[0022] A low-grade copper-bearing refractory gold ore (gold grade 4.5g / t, copper content 0.70%, containing a large amount of alkaline gangue) is first leached with ammonium cyanide, and after the leaching is completed, the slurry is introduced into the electrolytic tank, and the slurry The concentration is diluted to 15%, the pH value is controlled to be about 12.0, and the electrodeposition of the ore slurry is carried out. The anode is a lead alloy anode, the cathode is a stainless steel plate, and the cathode current density is controlled at 20A / m 2 , electrowinning for 8 hours, the gold concentration in the tailing liquid can be reduced to <0.02mg / L, and the gold grade in the tailings is 0.65g / t. For high-purity gold ingots and high-purity copper cathodes, the recovery rate of gold is 87.29%, and the production cost of gold is 170 yuan / g.

Embodiment 2

[0024] A low-grade copper-bearing refractory gold ore (gold grade 4.5g / t, copper content 0.70%, containing a large amount of alkaline gangue) is first leached with ammonium cyanide, and after the leaching is completed, the slurry is introduced into the electrolytic tank, and the slurry The concentration is diluted to 20%, the pH value is controlled to be about 12.0, and the electrodeposition of the ore slurry is carried out. The anode is a lead alloy anode, the cathode is a stainless steel plate, and the cathode current density is controlled at 15A / m 2 , electrowinning for 6 hours, the gold concentration in the tailing liquid can be reduced to <0.02mg / L, and the gold grade in the tailings is 0.75g / t. For high-purity gold ingots and high-purity copper cathodes, the recovery rate of gold is 85.33%, and the production cost of gold is 160 yuan / g.

Embodiment 3

[0026] A low-grade copper-bearing refractory gold ore (gold grade 4.5g / t, copper content 0.70%, containing a large amount of alkaline gangue) is first leached with ammonium cyanide, and after the leaching is completed, the slurry is introduced into the electrolytic tank, and the slurry The concentration is diluted to 15%, the pH value is controlled to be about 12.0, and the electrowinning of the ore slurry is carried out. The anode is a lead alloy anode, the cathode is a steel wool electrowinning (packed in a cloth bag), and the cathode current density is controlled at 20A / m 2 , electrowinning for 8 hours, the gold concentration in the tailing liquid can be reduced to <0.02mg / L, and the gold grade in the tailings is 0.65g / t. For high-purity gold ingots and high-purity copper cathodes, the gold recovery rate is 87.79%, and the production cost of gold is 168 yuan / g.

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Abstract

The invention relates to a process for extracting gold from a low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp via electrodeposition. The process comprises the following steps: diluting the low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp to the proper pulp concentration; leading the pulp into an electrodeposition tank and performing the electrodeposition on the pulp; refining the copper-containing gold powder obtained from a cathode, thereby obtaining a high-purity gold ingot and high-purity cathode copper; and discharging the pulp after the electrodeposition into a tailings pond. The process has the advantages that the technological process is short; the gold recovery rate is high; the production cost is low; the comprehensive recovery of copper is realized; the steps of countercurrent washing, carbon adsorption, gold-carrying carbon desorption-electrodeposition and the like in the conventional gold leaching process are omitted; the investment cost is lowered greatly; and the like.

Description

1. Technical field [0001] The invention relates to the metallurgical industry, in particular to a process for electrowinning gold from low-grade copper-containing refractory gold ore leached with cyanide. 2. Background technology [0002] Copper minerals are often associated with gold ores. When copper-containing gold ores are cyanided and leached, only a large amount of sodium cyanide can be added to obtain a higher gold leaching rate. The reason is that a large amount of sodium cyanide reacts with copper minerals and is absorbed consume. In general, about 30kg / t of sodium cyanide is consumed for leaching 1% of copper in the ore. The leaching of these copper minerals will consume a large amount of cyanide and dissolved oxygen, and will form a layer of insoluble CuCN precipitates on the surface of gold particles, which seriously hinders and interferes with the cyanidation leaching process of gold, resulting in a decrease in gold leaching rate and cyanide leaching. Sodium c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/20
Inventor 陈景河蓝碧波穆国红伍赠玲衷水平
Owner ZIJIN MINING GROUP
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