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Gold extracting method by thiosulfate using polyamine compoud as additive

A technology of thiosulfate and amine compounds, which is applied in the field of hydrometallurgy, can solve the problems of complex leaching system and large reagent consumption, and achieve the effect of high gold leaching rate, low reagent consumption and easy control

Inactive Publication Date: 2010-07-14
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- In order to solve the problems of large reagent consumption and complex leaching system in the gold leaching process of the mixed gold leaching solution, a thiosulfate gold extraction method with polyamine compounds as additives is provided

Method used

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  • Gold extracting method by thiosulfate using polyamine compoud as additive
  • Gold extracting method by thiosulfate using polyamine compoud as additive

Examples

Experimental program
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Effect test

Embodiment 1

[0014] For a gold mine containing 2.78g / t of gold and 0.18% of copper, the ore is crushed and wet-ground to a fineness of -200 mesh, accounting for 95%, the mass concentration of the pulp is adjusted to 40% with water, and thiosulfuric acid is added to the pulp according to the amount of water Sodium to 0.03mol / dm 3 , then add ethylenediamine to 0.003mol / dm 3 and CuSO 4 5H 2 O to copper (II) ions: 0.0015mol / dm 3 , forming ethylenediamine copper complex ion additive, adjusting the pH to 11 according to the routine, stirring and leaching for 6 hours to obtain a gold-containing leachate, and recovering the gold in the leachate according to the routine. The gold leaching rate is up to 87.3%, and the consumption of sodium thiosulfate is 3.5kg / t ore (when cuproammonia is used as additive, the consumption of sodium thiosulfate is 21.5kg / t ore).

Embodiment 2

[0016] For a flotation gold concentrate containing 198.2g / t and 23.1% copper, the ore is crushed and wet-ground to a fineness of -200 mesh, accounting for 95%, and the mass concentration of the pulp is adjusted to 40% with water. According to the amount of water, add Sodium thiosulfate to 3mol / dm 3 , then add diethylenetriamine to 0.09mol / dm 3 and CuCl 2 Up to 0.03mol / dm of copper(II) ions 3 , forming a diethylenetriamine copper complex ion additive, adjusting the pH to 12 as usual, stirring and leaching for 24 hours to obtain a gold-containing leachate, and recovering the gold in the leachate as usual. The gold leaching rate is up to 88.5%, and the consumption of sodium thiosulfate is 4.65kg / t ore (when cuproammonia is used as additive, the consumption of sodium thiosulfate is 29.6kg / t ore).

Embodiment 3

[0018] A gold concentrate contains 49.4g / t of gold and 2.4% of copper. The ore is crushed and wet-milled to a fineness of -200 mesh, accounting for 95%, and the mass concentration of the pulp is adjusted to 40% with water. According to the water volume, sodium thiosulfate is added to the pulp to 0.3mol / dm 3 , then add triethylenetetramine to 0.03mol / dm 3 and CuSO 4 5H 2 O to copper(II) ions: 0.015mol / dm 3 , forming a triethylenetetramine copper complex ion additive, adjusting the pH to 10 as usual, stirring and leaching for 12 hours to obtain a gold-containing leachate, and recovering the gold in the leachate as usual. The gold leaching rate is up to 87.3%, and the consumption of sodium thiosulfate is 4.5kg / t ore (when cuproammonia is used as additive, the consumption of sodium thiosulfate is 27.3kg / t ore).

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Abstract

The invention relates to a gold extracting method by thiosulfate using a polyamine compound as an additive, which comprises the steps: after ores are crushed and wet-ground until the fineness is over 90 percent of -200 meshes, 0.03-3mol / dm3 thiosulfate is added to be used as a leaching agent, and then 0.0015-0.09mol / dm3 polyamine compound and 0.0015-0.03mol / dm3 copper (II) ion are added to form a complex ion to be used as an additive to be stirred and leached; and after gold ores are leached, gold from a leaching solution is recovered. The leaching solution is used to extract gold from the ores, so that the gold leaching rate is high, the process operation is simple, the control is easy, the consumption of thiosulfate is extremely low, and the compositions of the gold leaching solution are simple and are favorable for the recovery of the gold; and the application range is wide, the leaching effect is good when the pH value is between 10 and 12, the leaching speed is quick for copper-containing, carbon-containing and other refractory gold ores, quite high gold leaching rate can be maintained, and sodium cyanide and other toxic substances are not used and toxic waste is not discharged in the whole gold extraction process, so the environment is protected.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a thiosulfate gold extraction method using polyamine compounds as additives. 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. Some countries and regions have banned the use of cyanide in gold extraction. compounds. In addition, the cyanidation method is difficult to deal with complex gold ores containing copper and carbon. Among the cyanide replacement reagents that have been studied, thiosulfate is considered to be the most promising method to replace cyanide because of its rapidity and non-toxicity. However, in order to increase the gold leaching speed, most researchers use copper (II) ions and ammonia water to form...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B11/00
CPCY02P10/20
Inventor 胡显智字富庭段玲玲白成庆刘洋
Owner KUNMING UNIV OF SCI & TECH
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