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Thiosulfate gold extracting method taking diethylenetriamine as additive

A technology of diethylenetriamine and thiosulfate, applied in the field of hydrometallurgy, can solve the problems of large consumption of reagents and complex leaching system, and achieve the effects of fast leaching speed, simple components and strong adaptability to mineral samples

Inactive Publication Date: 2012-10-31
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] To solve Cu 2+ -NH 3 -S 2 o 3 2- In order to solve the problems of high reagent consumption and complex leaching system in the gold leaching process of the mixed gold leaching solution, the present invention provides a method that uses diethylenetriamine and copper (II) ions to form diethylenetriamine-copper (II) complex ions instead of Cu 2+ -NH 3 -S 2 o 3 2- The method of leaching copper ammonia (II) complex ions in the leaching system, that is, using thiosulfate as the leaching agent, diethylene triamine and copper (II) ions to form diethylene triamine copper (II) complex ions as additives to form leaching gold liquid method

Method used

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  • Thiosulfate gold extracting method taking diethylenetriamine as additive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. 100kg of gold-bearing rock (the ore contains 2.78g / t gold and 0.18% copper) is crushed and wet-milled until the fineness of the ore is -200 mesh, which accounts for 90%, to form a slurry;

[0022] b. Adjust the mass concentration of the slurry to 40%, and add sodium thiosulfate to 0.03mol / dm based on the amount of water. 3 As a leaching agent, add diethylenetriamine to 0.003mol / dm 3 , CuSO 4 ·5H 2 O to copper(II) ion is 0.0015mol / dm 3 , Make diethylenetriamine and copper(II) ion form the additive of diethylenetriamine copper(II) complex ion, adjust the pH to 11 according to the routine, stir and leach for 6 hours to obtain the gold-containing leachate, and recover the leachate as usual Of gold. Among them, the leaching rate of gold reaches 86.3%, and the consumption of sodium thiosulfate is 3.3 kg / t of ore.

[0023] Compared with the consumption of sodium thiosulfate (21.5 kg / t ore) when copper ammonia is used as an additive in the prior art, the consumption of sodium thi...

Embodiment 2

[0025] a. Crush 50kg of a certain flotation gold concentrate ore (the ore contains 198.2g / t gold and 23.1% copper), and wet ground until the ore fineness is -200 mesh accounting for 90%, forming a slurry;

[0026] b. Adjust the mass concentration of the slurry to 40%, and add the leaching agent sodium thiosulfate to the slurry to 3mol / dm based on the amount of water 3 , Then add diethylene triamine to 0.03mol / dm 3 , CuCl 2 To copper(II) ion is 0.03mol / dm 3 , Make diethylene triamine and copper (II) ion form diethylene triamine copper (II) complex ion additive, adjust pH to 12, stir and leaching for 24 hours to obtain gold-containing leachate, and recover gold in leachate as usual . Then, the gold leaching rate reaches 88.5%, and the consumption of sodium thiosulfate is 4.65 kg / t ore.

[0027] Compared with the consumption of sodium thiosulfate (29.6 kg / t ore) when copper ammonia is used as an additive in the prior art, the consumption of sodium thiosulfate is greatly reduced.

Embodiment 3

[0029] a. Crush 80kg of a gold concentrate ore (the ore contains 49.4g / t gold and 2.4% copper), and wet ground until the ore fineness is -200 mesh, which accounts for 90%, to form a slurry;

[0030] b. Adjust the mass concentration of the slurry to 40%, and add the leaching agent sodium thiosulfate to the slurry to 0.3mol / dm based on the amount of water 3 , Then add diethylene triamine to 0.0015mol / dm 3 , CuSO 4 ·5H 2 O to copper(II) ion is 0.015mol / dm 3 , Make diethylene triamine and copper (II) ion form diethylene triamine copper (II) complex ion additive, adjust pH to 10, stir and leach for 12 hours to obtain gold-containing leachate, and recover gold in leachate as usual . Then, the leaching rate of gold reaches 90.3%, and the consumption of sodium thiosulfate is 4.55 kg / t ore.

[0031] Compared with the consumption of sodium thiosulfate when copper ammonia is used as an additive in the prior art (27.3 kg / t ore), the consumption of sodium thiosulfate is greatly reduced.

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Abstract

The invention provides a thiosulfate gold extracting method taking diethylenetriamine as an additive, which is characgerized by comprising the following steps of: adding 0.03-3 mol / dm<3> of thiosulfate leaching agents to ore pulp which is subjected to wet grinding and has the mass concentration of 40 percent by water volume; then adding a diethylenetriamine and copper (II) coordination ion additive formed by 0.0015-0.09 mol / dm<3> of the diethylenetriamine and 0.0015-0.03 mol / dm<3> of copper (II) ions; regulating pH to 10-12; stirring and leaching for 6-24 hours so as to obtain gold-containingleaching liquor; and conventionally recovering the gold contained in the leaching liquor. The invention extracts the gold from ores by using the leaching liquor and has high gold leaching rate, extremely low thiosulfate consumption amount, high leaching speed, simple process operation and easy control, the simple components of the gold leaching liquor is beneficial to recovering the gold contained in the leaching liquor, the change of the pH has little influence on gold leaching and the whole gold extracting process has no poisonous wastes and can not pollute the environment.

Description

Technical field [0001] The invention relates to a thiosulfate gold extraction method using diethylenetriamine as an additive, and belongs to the technical field of hydrometallurgy. Background technique [0002] At present, the most important method for gold extraction is cyanidation, which accounts for more than 80%. However, sodium cyanide is a highly toxic chemical. The residual sodium cyanide in the tailings dam and the toxic cyanide produced during the gold leaching process can cause serious environmental pollution. For this reason, some countries and regions have banned the extraction of gold. Cyanide is used in. In addition, the cyanidation method is also difficult to process complex gold mines containing copper and carbon. [0003] In recent years, in the research of alternative reagents for cyanide, the thiosulfate method is considered to be the most promising method for replacing the cyanide method due to its rapid and non-toxic characteristics. However, in order to inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/04
CPCY02P10/20
Inventor 字富庭胡显智白成庆段玲玲刘洋
Owner KUNMING UNIV OF SCI & TECH