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Method for extracting gold from copper-containing gold oxide ore

A technology of copper oxidation and gold mining, applied in the field of hydrometallurgy, can solve the problems of high price, large consumption of reagents, and less industrial application, and achieve the effects of high gold recovery rate, reduced chemical cost, and low copper leaching rate

Active Publication Date: 2012-09-26
ZIJIN MINING GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Step-by-step extraction processes mainly include sulfuric acid leaching copper decacyanide gold leaching process, roasting step-by-step leaching process, bioleaching process, and chlorination pretreatment of copper-gold ore, etc. These processes have the disadvantages of large acid consumption and acid-base media Transformation or longer cycle and other disadvantages; selective gold leaching is mainly suitable for copper-gold mines with low copper content. The gold economy is not as good as the cyanidation method, the reagent consumption is large, the price is high, and the industrial application is less; while the selective leaching of gold in the cyanide system seriously pollutes the environment, affects the health of the operators, increases labor protection investment, and consumes more chemicals. Big, the equipment needs to be anti-corrosion and other shortcomings

Method used

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  • Method for extracting gold from copper-containing gold oxide ore
  • Method for extracting gold from copper-containing gold oxide ore

Examples

Experimental program
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Effect test

example 1

[0028] Example 1: Raw ore Au2.62g / t, Cu0.62% copper-containing gold oxide ore, add lime 18kg / t~20kg / t, grind to -200 mesh to account for 95%, and make slurry with a liquid-solid ratio of 2:1 , add imidazole 0.3kg / t and NaCN1.0kg / t solution into the slurry into the leaching tank for gold dissolution reaction, leaching at room temperature for 72h, Au leaching rate is 70.56%, Cu leaching rate is 4.23%. The liquid-solid separation equipment for the pulp containing dissolved gold, the gold-containing liquid-precious liquid produced enters the liquid storage tank, and the leaching residue is discarded; the gold-containing precious liquid enters the adsorption equipment, and 15g / L of activated carbon is added to the adsorption device to recover the precious liquid The gold, Au adsorption rate reached 98.39%.

example 2

[0029] Example 2: The raw ore contains Au9.37g / t, Cu1.08% copper-containing oxidized gold ore, add lime 18kg / t~20kg / t, grind to -200 mesh to account for 95%, and make slurry with a liquid-solid ratio of 2 : 1. Add imidazoline 0.3kg and 1.0kg / tNaCN solution into the pulp into the leaching tank for gold-dissolving reaction, leaching at room temperature for 48-72h, the leaching rate of Au is 84.20%, and the leaching rate of Cu is 6.17%. The liquid-solid separation equipment for the pulp containing dissolved gold, the gold-containing liquid-precious liquid produced enters the liquid storage tank, and the leaching residue is discarded; the gold-containing precious liquid enters the adsorption equipment, and 15g / L of activated carbon is added to the adsorption device to recover the precious liquid The gold, Au adsorption rate reached 98.78%.

example 3

[0030] Example 3: The raw ore contains Au3.19g / t, Cu0.67% copper-containing oxidized gold ore, add lime 18kg / t~20kg / t, grind to -200 mesh to account for 95%, and adjust the slurry to a liquid-solid ratio of 2 : 1, add 0.3kg / t and 1.0kg / tNaCN solution of imidazole and imidazoline mixture of 2:1 into the pulp, enter the leaching tank, and carry out the gold dissolution reaction, leaching at room temperature for 48~72h, Au leaching rate 75.20%, Cu The leaching rate is 7.87%. The liquid-solid separation equipment for the pulp containing dissolved gold, the gold-containing liquid-precious liquid produced enters the liquid storage tank, and the leaching residue is discarded; the gold-containing precious liquid enters the adsorption equipment, and 15g / L of activated carbon is added to the adsorption device to recover the precious liquid The gold, Au adsorption rate reached 99.21%.

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Abstract

The invention discloses a method for extracting gold from copper-containing gold oxide ore, belonging to a wet metallurgy technology. The method comprises the steps of: firstly, crushing, grinding and classifying copper-containing gold oxide ore; then carrying out alkali treatment on the copper-containing gold oxide ore; adding a certain proportion of chelant and sodium cyanide for realizing the purposes of inhibiting copper extraction and selective extraction of gold; and finally, extracting gold from the extract solution through adsorption by using conventional active carbon. The method has the advantages of simple process, simple equipment, easy implementation, high gold extraction rate, less chemical consumption, less investment of capital construction, and low cost, easily realizes industrialized production and has better economic benefit.

Description

1. Technical field [0001] The invention belongs to hydrometallurgy technology, in particular to a method for extracting gold from copper-containing oxidized gold ore. 2. Background technology [0002] In the field of hydrometallurgy, copper-bearing gold ores are recognized as one of the refractory ores. Due to the high copper content (greater than 0.5%) of this type of ore, the cyanide consumption increases during the cyanidation gold leaching process, and the gold leaching rate is low at the same time. Since this kind of ore occupies a certain proportion in the gold ore reserves, it is of great practical significance for the development and utilization of gold ore resources to explore the reasons for its refractory separation and choose the appropriate gold extraction process. [0003] In copper compounds, except for chrysocolla and chalcopyrite, which have limited solubility in cyanide solution (5.6%), most of natural copper, copper oxide, chalcocite, bornite, chalcopyrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08
Inventor 胡敏巫銮东穆国红廖德华鲁军
Owner ZIJIN MINING GROUP
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