Method for directly recovering gold in thiosulfate system by using activated carbon

A technology of thiosulfate and activated carbon, which is applied in the field of precious metal recovery and hydrometallurgy, can solve the problems of limited activated carbon, long surface distance, difficult activated carbon adsorption, etc., and achieves environmental friendliness, high recovery rate, avoiding hazards and complicated processes The effect of craft

Active Publication Date: 2021-01-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Au(S 2 o 3 ) 2 3- Coordinating groups and molecular structure steric effects lead to a long distance between the gold atom and the carbon surface, making it difficult to directly adsorb with activated carbon, which limits the application of activated carbon in the recovery of gold from thiosulfate leaching solutions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present embodiment adopts dithiocyanomethane as an additive, and reclaims the gold in the thiosulfate system with activated carbon, comprising the following steps:

[0022] (1) Wash the activated carbon with deionized water to remove ash, filter and dry for later use.

[0023] (2) To a volume of 100 mL, Au(S 2 o 3 ) 2 3- Add 0.01g / L dithiocyanomethane to the gold immersion solution with a concentration of 5 mg / L to adjust the pH to 6.

[0024] (3) Add 0.5 g of activated carbon to the solution obtained in step (2) (at this time, the solid-to-liquid ratio is 1:200), and stir and adsorb gold for 0.1 h.

[0025] The concentration of gold was analyzed by sampling, and the calculated adsorption rate was 35%.

Embodiment 2

[0027] The present embodiment adopts benzene isothiocyanate as an additive, and reclaims the gold in the thiosulfate system with activated carbon, comprising the following steps:

[0028] (1) Wash the activated carbon with deionized water to remove ash, filter and dry for later use.

[0029] (2) To a volume of 100 mL, Au(S 2 o 3 ) 2 3- Add 0.1 g / L benzene isothiocyanate to the gold leaching solution with a concentration of 10 mg / L to adjust the pH to 7.

[0030] (3) 1.0 g of activated carbon was added to the solution obtained in step (2) (at this time, the solid-to-liquid ratio was 1:100), and the gold was stirred and adsorbed for 2 h.

[0031] Sampling was carried out to analyze the gold concentration, and the calculated adsorption rate was 37%.

Embodiment 3

[0033] Present embodiment adopts benzyl thiocyanate as additive, reclaims the gold in the thiosulfate system with gac, comprises the following steps:

[0034] (1) Wash the activated carbon with deionized water to remove ash, filter and dry for later use.

[0035] (2) To a volume of 100 mL, Au(S 2 o 3 ) 2 3- Add 5 g / L benzyl thiocyanate to the gold immersion solution with a concentration of 20 mg / L to adjust the pH to 8.

[0036] (3) 2.0 g of activated carbon was added to the solution obtained in step (2) (at this time, the solid-to-liquid ratio was 1:50), and the gold was stirred and adsorbed for 4 h.

[0037] The gold concentration was analyzed by sampling, and the calculated adsorption rate was 46%.

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Abstract

The invention discloses a method for directly recovering gold in a thiosulfate system by using activated carbon, and belongs to the technical fields of hydrometallurgy and precious metal recovery. According to the method, an organic matter containing a thiocyanogen (-S-C(triple bond)N) group or an isothiocyanogen (N=C=S) group is used as an additive of a thiosulfate system gold leaching solution,the environment of the solution can be changed by using the additive, and finally Au(S2O3)23- in the solution can be directly adsorbed and recovered by using unmodified activated carbon. According tothe method, the problems of environmental pollution, equipment corrosion and the like caused by modified activated carbon are effectively avoided, and the method is suitable for application in actualproduction; the operation process is simple and easy to control, the reagent dosage is low, and the cost investment is reasonable; and the gold can be efficiently recovered by the unmodified activatedcarbon in a short time under the condition of low additive dosage, and the progress of the thiosulfate gold extraction technology towards industrial development can be accelerated.

Description

technical field [0001] The invention relates to a method for directly using activated carbon to recover gold in a thiosulfate system, and belongs to the technical fields of hydrometallurgy and precious metal recovery. Background technique [0002] The carbon-in-pulp method (CIL) is currently the preferred gold recovery method in most cyanide gold extraction plants, but the highly toxic cyanide in this method is likely to cause environmental pollution and ecological damage, so many non-cyanide gold extraction methods have been studied. Researching widely. The thiosulfate method is the most promising gold extraction technology to replace the cyanide method. In recent years, the thiosulfate gold leaching process has been greatly developed. However, due to the Au(S 2 o 3 ) 2 3- Coordinating groups, steric effects of molecular structure, etc. lead to long distance between gold atoms and carbon surface, and difficult adsorption, so that the carbon slurry method cannot be wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/24
CPCC22B11/04C22B3/24Y02P10/20
Inventor 字富庭蒋云舒陈云龙胡显智杨朋
Owner KUNMING UNIV OF SCI & TECH
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