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Low-grade copper-bearing gold ore dump leaching-carbon adsorption production method

A low-grade, carbon adsorption technology, applied in the field of metallurgy, can solve the problems of poor operating environment, low ammonia recovery rate of ammonia leaching solution, high safety operation requirements, etc., to achieve low production costs, optimize production technical indicators, and improve gold. Effect of desorption 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, the cyanide decopper process must use acidification to recover copper and cyanide, and there are potential safety hazards caused by the escape of HCN gas, which requires high safety operations in production; the ammonia leaching decopper process requires the use of high-concentration ammonia water. There are problems such as poor operating environment and low ammonia recovery rate in ammonia leaching solution

Method used

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  • Low-grade copper-bearing gold ore dump leaching-carbon adsorption production method

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Experimental program
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Embodiment 1

[0021] The low-grade copper-bearing gold ore with a gold grade of 0.5g / t and a copper content of 0.03% is subjected to heap leaching and cyanidation leaching, and the leached liquid is adsorbed by activated carbon; Cyanide copper removal under the condition of 3% sodium for 18 hours, and the carbon layer was agitated by air every 15 to 30 minutes; the copper removal solution was diluted with adsorption barren solution to a concentration of sodium cyanide <50mg / L and then used as the spray solution at the end of heap leaching. Part of the copper is re-precipitated in the storage yard, and the sodium cyanide produced by the copper precipitation reaction is used to leach gold; the decoppered carbon is sent to a high-temperature and high-pressure cyanide-free desorption-electrowinning system for treatment, and the obtained coarse gold powder is refined to obtain gold Ingots, the regenerated carbon is returned to the carbon adsorption system. The average concentration of copper in ...

Embodiment 2

[0023] The low-grade copper-bearing gold ore with a gold grade of 0.5g / t and a copper content of 0.03% is subjected to heap leaching and cyanidation leaching, and the leaching liquid is adsorbed by activated carbon; Under the condition of 5% sodium, cyanide decopper for 36 hours, agitate the carbon layer with air every 15-30 minutes; the decopper solution is diluted with adsorption barren solution until the concentration of sodium cyanide is less than 50mg / L, and then it is used as the spray solution at the end of heap leaching. Part of the copper is re-precipitated in the storage yard, and the sodium cyanide produced by the copper precipitation reaction is used to leach gold; the decoppered carbon is sent to a high-temperature and high-pressure cyanide-free desorption-electrowinning system for treatment, and the obtained coarse gold powder is refined to obtain gold Ingots, the regenerated carbon is returned to the carbon adsorption system. The average copper concentration in ...

Embodiment 3

[0025] The low-grade copper-bearing gold ore with a gold grade of 0.5g / t and a copper content of 0.03% is subjected to heap leaching and cyanidation leaching, and the leaching liquid is adsorbed by activated carbon; Under the condition of 2% sodium, cyanide decopper for 15 hours, and the carbon layer is stirred by air every 15-30 minutes; the decopper solution is diluted with adsorption barren solution until the concentration of sodium cyanide is less than 50mg / L, and then it is used as the spray solution at the end of heap leaching. Part of the copper is re-precipitated in the storage yard, and the sodium cyanide produced by the copper precipitation reaction is used to leach gold; the decoppered carbon is sent to a high-temperature and high-pressure cyanide-free desorption-electrowinning system for treatment, and the obtained coarse gold powder is refined to obtain gold Ingots, the regenerated carbon is returned to the carbon adsorption system. The copper concentration in the...

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Abstract

The invention relates to a low-grade copper-bearing gold ore dump leaching-carbon adsorption production method. Copper contained in high-copper gold-carried carbon obtained through a low-grade copper-bearing gold ore dump leaching-carbon adsorption procedure is partially removed by adopting a cyaniding decoppering process, a decoppering solution is diluted by utilizing an adsorption barren solution to be used as a spray solution at the late stage of dump leaching, and decoppering carbon is conveyed to a high-temperature high-pressure cyanide-free desorption-electrodeposition system for treatment. The low-grade copper-bearing gold ore dump leaching-carbon adsorption production method disclosed by the invention has the advantages of simple process flow, small investment, no other original paving material addition, low production cost and the like, and is easy to industrially implement; according to the invention, after the high-copper gold-carried carbon is subjected to cyaniding decoppering, the gold desorption rate of the high-copper gold-carried carbon can be enhanced, and the adsorption property of regenerated carbon is enhanced, so that the adsorption rate of gold is enhanced, and the production technology index is optimized; and a part of copper contained in the decoppering solution and the adsorption barren solution can be deposited in a stock dump again by adopting a copper deposition process at the late stage of the dump leaching, the gold can be leached by utilizing sodium cyanide generated through copper deposition reaction, so that the concentration of copper contained in the dump leaching-carbon adsorption system can be effectively controlled, and the production system can be in a good operating environment all the time.

Description

1. Technical field [0001] The invention relates to the metallurgical industry, in particular to a method for heap leaching-carbon adsorption production of low-grade copper-containing gold ores. 2. Background technology [0002] At present, the flotation process is mostly used for copper-gold enrichment of higher grade gold-copper ores before smelting and recycling, while for copper-containing oxidized or semi-oxidized gold ores with lower copper-gold grades, most of them use heap leaching-carbon Adsorption gold extraction technology. Due to the high copper content, the leaching of copper will consume a large amount of cyanide during the heap leaching process, resulting in a low gold leaching rate or an increase in leaching costs, and even causing gold extraction to be economically unfeasible; Subsequent operations have a greater impact, mainly reflected in the increase in the copper content of activated carbon, the decrease in the adsorption performance of activated carbon,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08C25C1/20
Inventor 陈淑萍伍赠玲蓝碧波衷水平邹来昌简伟峰穆国红廖占丕赖桂华王世辉
Owner ZIJIN MINING GROUP
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