Thiosulfate gold extraction method taking Fe (III) cyanide salts as oxidants

A technology of thiosulfate and cyanide, which is applied in the field of gold extraction, can solve the problems of large reagent consumption and complex leaching system, and achieve the effects of low reagent consumption, high gold leaching rate and low consumption

Inactive Publication Date: 2012-07-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is aimed at Cu 2+ -NH 3 -S 2 o 3 2- The mixed gold leaching solution consumes a lot of reagents and the leaching system is complicated during the gold leaching process. A new thiosulfate gold leaching method is proposed, that is, the iron (Ⅲ) cyanide complex with b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1

[0017] The placer containing 2.45g / t gold, 0.18% copper and 0.28% sulfur in a gold mine in Qinghai was crushed and wet ground to a fineness of -200 mesh, accounting for 90%, adjusting the mass concentration of the slurry to 50%, and adding it to the slurry Add a solution of potassium ferricyanide with a pH greater than 9, sodium thiosulfate and thiourea to make the concentration of sodium thiosulfate in the entire system 0.01mol / dm 3 、The concentration of potassium ferricyanide is 0.1mmol / dm 3 , The concentration of thiourea is 0.001mmol / dm 3 , And then adjust the pH of the system to 11, and leaching for 9 hours with stirring, and finally recovering the gold in the leaching solution by conventional methods.

[0018] The gold leaching rate is 87.3%, and the consumption of sodium thiosulfate is 3.3kg / t of ore; and when copper ammonia is used as an additive, the consumption of sodium thiosulfate is 18.5kg / t of ore.

Example Embodiment

[0019] Example 2

[0020] A certain flotation gold concentrate containing 198.2g / t, 23.1% copper and 6.5% sulfur is crushed and wet ground to a fineness of -200 mesh accounting for 95%, and the mass concentration of the slurry is adjusted to 30%, and then added to the slurry A solution of sodium ferricyanide with a pH value of 10, sodium thiosulfate and thiourea, so that the concentration of sodium thiosulfate in the entire system is 2mol / dm 3 , The concentration of sodium ferricyanide 1.0mmol / dm 3 , The concentration of thiourea is 10.0mmol / dm 3 , Then adjust the pH of the system to 8 with sodium hydroxide, and leaching for 24 hours with stirring, and finally recovering the gold in the leaching solution according to the conventional method.

[0021] The gold leaching rate is 80.5%, and the consumption of sodium thiosulfate is 4.65 kg / t of ore; and when copper ammonia is used as an additive, the consumption of sodium thiosulfate is 29.6 kg / t of ore.

Example Embodiment

[0022] Example 3

[0023] A gold concentrate containing 49.4g / t gold and 2.4% copper is crushed and wet ground to a fineness of -200 mesh accounting for 95%, the mass concentration of the slurry is adjusted to 40%, and then iron with a pH of 11 is added to the slurry Potassium cyanide solution, sodium thiosulfate and thiourea, so that the concentration of sodium thiosulfate in the whole system is 1mol / dm 3 , The concentration of potassium ferricyanide 0.5mmol / dm 3 , The concentration of thiourea is 5mmol / dm 3 , Then use potassium hydroxide to adjust the pH of the system to 13, and leaching for 24 hours with stirring. Finally, the gold in the leaching solution is recovered by conventional methods.

[0024] The gold leaching rate is 85.3%, and the consumption of sodium thiosulfate is 5.1kg / t of ore; and when copper ammonia is used as an additive, the consumption of sodium thiosulfate is 30.8kg / t of ore.

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Abstract

The invention provides a thiosulfate gold extraction method taking Fe (III) cyanide salts as oxidants. The method comprises the following steps: crushing and wet milling golden placer or mineral; adding solutions of Fe (III) cyanide salts, thiosulfate, and thiocarbamide into the ore pulp so as to ensure that in the whole system, the concentration of the thiosulfate is 0.01 to 2 mol/dm<3>, the concentration of the Fe (III) cyanide salts is 0.1 to 1.0 mmol/dm<3>, and the concentration of the thiocarbamide is 0.001 to 10.0 mmol/dm<3>; adjusting the pH value of the system to be 8 to 13; stirring and leaching for 9 to 24 hours; and recycling gold in the leachate according to a conventional method. The method has the advantages that the leaching rate is high; the process operation is simple and easy to control; the consumption of thiosulfate is low; the ingredients of the golden leachate are simple, so as to facilitate the recycling of gold; the application range is wide; and the purpose of environmental protection is realized.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and relates to a method that uses thiosulfate as a gold extraction reagent and uses iron ( ) The method of extracting gold from ore with cyanide salts as oxidants. Background technique [0002] Cyanide is currently the most important method of gold extraction. However, sodium cyanide is a highly toxic chemical. The sodium cyanide remaining in the tailings dam and some toxic cyanide produced during the gold leaching process can cause serious environmental problems. For this reason, some countries and regions have banned its use in gold extraction. cyanide. In addition, the cyanidation method is difficult to deal with complex gold ores containing copper and carbon. Among the cyanide replacement reagents studied in recent years, thiosulfate is considered to be the most promising method to replace cyanide because of its rapidity and non-toxicity. In order to improve the gold leaching speed, many l...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B11/00
CPCY02P10/20
Inventor 胡显智字富庭何素琼杨保民
Owner KUNMING UNIV OF SCI & TECH
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