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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

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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 better stability and higher oxidation potential is used. Ions are used as oxidants, thiosulfate is used as gold complexing agent, and a small amount of thiourea is added as a leaching aid to form a gold leaching solution to extract gold in ores, and the following technical solutions are implemented

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The placer containing 2.45g / t of gold, 0.18% of copper, and 0.28% of sulfur in a gold mine in Qinghai was crushed and wet-ground to a fineness of -200 mesh, accounting for 90%, and the mass concentration of the pulp was adjusted to 50%, and then added to the pulp Add a solution of potassium ferricyanide with a pH value greater than 9, sodium thiosulfate and thiourea, so that the concentration of sodium thiosulfate in the entire system is 0.01mol / dm 3 , Potassium ferricyanide concentration 0.1mmol / dm 3 , The concentration of thiourea is 0.001mmol / dm 3 , then adjust the pH of the system to be 11, and stir and leach for 9 hours, and finally recover 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 ore; and when cuproammonia is used as additive, the consumption of sodium thiosulfate is 18.5kg / t ore.

Embodiment 2

[0020] Crushing and wet-grinding a flotation gold concentrate containing 198.2g / t, 23.1% copper, and 6.5% sulfur until the fineness is -200 mesh, accounting for 95%, adjusting the mass concentration of the pulp to 30%, and then adding A solution of sodium ferricyanide, sodium thiosulfate and thiourea with a pH value of 10, so that the concentration of sodium thiosulfate in the whole system is 2mol / dm 3 , the concentration of sodium ferricyanide 1.0mmol / dm 3 , the concentration of thiourea is 10.0mmol / dm 3 , and then use sodium hydroxide to adjust the pH value of the system to 8, and stir and leaching for 24 hours, and finally reclaim the gold in the leach solution by conventional methods.

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

Embodiment 3

[0023] A gold concentrate containing 49.4g / t gold and 2.4% copper was crushed and wet-milled to a fineness of -200 mesh, accounting for 95%, the mass concentration of the pulp was adjusted to 40%, and then iron with a pH value of 11 was added to the pulp Solution of potassium cyanide, sodium thiosulfate and thiourea, so that the concentration of sodium thiosulfate in the whole system is 1mol / dm 3 , Potassium ferricyanide concentration 0.5mmol / dm 3 , the concentration of thiourea is 5mmol / dm 3 , then use potassium hydroxide to adjust the pH value of the system to 13, and stir and leach for 24 hours, and finally recover the gold in the leaching solution 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 cuproammonia 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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