Method for extracting gold from thiosulfate adopting ethanediamine as additive

A technology of thiosulfate and ethylenediamine, which is applied in the field of hydrometallurgy, can solve the problems of large consumption of reagents and complex leaching system, and achieve the effects of low consumption of reagents, high gold leaching rate and simple composition

Inactive Publication Date: 2010-09-08
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 i

Method used

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  • Method for extracting gold from thiosulfate adopting ethanediamine as additive
  • Method for extracting gold from thiosulfate adopting ethanediamine as additive

Examples

Experimental program
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Effect test

Embodiment 1

[0014] A gold mine contains 2.78g / t gold and 0.18% 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% (solid phase 40%, liquid phase 60%) with water, and sodium thiosulfate is added to the pulp to 0.03mol according to the water volume / 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] A flotation gold concentrate contains 198.2g / t of gold and 23.1% 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 3mol / dm 3 , then add ethylenediamine to 0.09mol / dm 3 and CuSO 4 5H 2 O to copper (II) ion is 0.03mol / dm 3 , form ethylenediamine copper complex ion additive, adjust the pH to 12 according to the routine, and stir and leach for 24 hours to obtain a gold-containing leachate, and recover the gold in the leachate according to the routine. The gold leaching rate reaches 88.4%, and the consumption of sodium thiosulfate is 4.92kg / t of ore (when cuproammonia is used as an additive, the consumption of sodium thiosulfate is 29.6kg / t of ore).

Embodiment 3

[0018] A gold concentrate contains 49.4g / t of gold and 2.4% of copper. Crush and wet-grind the ore to a fineness of -200 mesh, accounting for 95%, adjust the mass concentration of the pulp to 40% with water, and add sodium thiosulfate to the pulp to 0.3mol / dm in terms of water volume 3 , then add ethylenediamine to 0.03mol / dm 3 and CuCl 2 Up to 0.015mol / dm of copper (II) ions 3 , form ethylenediamine copper complex ion additive, adjust the pH to 10 according to the routine, and stir and leach for 12 hours to obtain a gold-containing leachate, and recover the gold in the leachate according to the routine. The gold leaching rate reaches 87.3%, and the consumption of sodium thiosulfate is 4.75kg / t of ore (when cuproammonia is used as an additive, the consumption of sodium thiosulfate is 27.3kg / t of ore).

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Abstract

The invention relates to a method for extracting gold from thiosulfate adopting ethanediamine as an additive. The method comprises the following steps that: the ethanediamineas is adopted as ligand and forms ethanediamine copper (II) complex ion with copper (II) ion, the formed ethanediamine copper (II) complex ion is used as the additive, and the thiosulfate is used as a leaching agent and is used for extracting the gold from ore pulp; and calculated by water amount, the adding amount of the thiosulfate is 0.03-3mol/dm<3>, the adding amount of the ethanediamine is 0.0015-0.09mol/dm<3>, and the adding amount of copper (II) ion is 0.0015-0.03mol/dm<3>. The leachate is used for extracting the gold from the ore, the leaching rate of the gold is high, the technique operation is simple, the control is easy, the consumption amount of the thiosulfate is extremely low, and the ingredients of the gold leachate are simple and are beneficial to recovery of the gold therein. The method has wide application range, has good leaching effect when the pH is between 10 and 12, also has fast leaching speed of gold ores which contain copper, carbon and the like and are difficult to treat, can maintain quite high gold leaching rate, and the whole gold extracting process does not use toxic substances of sodium cyanide and the like, also does not discharge toxic waste, and is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for extracting gold from thiosulfate with ethylenediamine as an additive. Background technique [0002] Cyanide is currently the most important method of gold extraction. However, sodium cyanide is a highly toxic chemical. Not only is it itself toxic, but some toxic cyanide will eventually remain in the tailings dam during the gold leaching process, which can cause serious environmental problems. In recent years, some countries and regions have banned the use of Cyanide is used in gold extraction. 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, when there is only thiosulfate in the gold leaching solution, the di...

Claims

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Application Information

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