Method for recovering gold from gold-loaded carbon in thiosulfate system

A technology of thiosulfate and recovery method, which is applied in the field of recovery of gold on gold-loaded carbon in thiosulfate system, to achieve the effects of easy re-modification, good desorption effect, and simple and easy operation

Active Publication Date: 2020-07-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for recovering gold on gold-loaded carbon in a thiosulfate system, which uses non-toxic and cheap thiosulfate solution to separate the gold on gold-loaded carbon, and solves the problem of live gold-loaded carbon. The recovery of gold and the reuse of activated carbon specifically include the following steps:

Method used

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  • Method for recovering gold from gold-loaded carbon in thiosulfate system

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Take 2.0g of the first granular activated carbon with a gold loading capacity of 2.0kg / t, wash it with deionized water, remove powder dust, filter, and heat in an oven at 100°C for 48h (the first granular Activated carbon is: first modified by 2-mercaptobenzothiazole, and then obtained from Au(S 2 o 3 ) 2 3- activated carbon after adsorption of gold in the solution).

[0022] (2) According to the liquid-solid ratio (mL:g) of 100, put 2.0g of the gold-loaded carbon dried in step (1) into 200ml of 0.3mol / L sodium thiosulfate solution, stir and desorb for 12h The concentration of gold in the solution was measured by atomic absorption, the activated carbon was taken out, and dried; the calculated desorption rate was 61%.

[0023]

[0024] (3) Re-modify the desorbed activated carbon, analyze and calculate the gold adsorption capacity of the re-modified activated carbon, the specific method is:

[0025] Take 2g of desorbed activated carbon, wash with deionized w...

Embodiment 2

[0030] (1) Take 2.0g of the first granular activated carbon with a gold loading capacity of 2.0kg / t, wash with deionized water, remove powder dust, filter, and bake at 250°C for 24h (the first granular activated carbon is: first Modified by 1-methyl-5-mercaptotetrazolium, and then obtained from Au(S 2 o 3 ) 2 3- activated carbon after adsorption of gold in the solution).

[0031] (2) According to the ratio of liquid to solid (mL:g) of 5, put 2.0g of the gold-loaded carbon dried in step (1) into 0.05mol / L sodium thiosulfate solution for 1h and then use atomic absorption to determine Gold concentration in the solution, remove the activated carbon, and dry it. The calculated desorption rate is 100% (the calculation method is the same as in Example 1).

[0032] (3) Re-modify the desorbed activated carbon, analyze and calculate the gold adsorption capacity of the re-modified activated carbon, the specific method is:

[0033] Take 5.0 g of desorbed granular activated carbon,...

Embodiment 3

[0038] (1) Take 2.0g of the third granular activated carbon with a gold loading capacity of 2.0kg / t, wash with deionized water, remove powder dust, filter, and heat at 400°C for 1h (the third granular activated carbon is: First modified by 2-mercaptobenzoxazole, and then obtained from Au(S 2 o 3 ) 2 3- activated carbon after adsorption of gold in the solution).

[0039] (2) According to the liquid-solid ratio (mL:g) of 40, put 2.0g of gold-loaded carbon dried in step (1) into 0.25mol / L sodium thiosulfate solution for desorption for 24h, take out the activated carbon and use The concentration of gold in the solution was determined by atomic absorption and dried. The calculated desorption rate is 74% (the calculation method is the same as in Example 1).

[0040] (3) Re-modify the desorbed activated carbon, analyze and calculate the gold adsorption capacity of the re-modified activated carbon, the specific method is:

[0041] Take 2.0 g of desorbed activated carbon, wash ...

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Abstract

The invention discloses a method for recovering gold from gold-loaded carbon in a thiosulfate system, and belongs to the field of wet metallurgy and precious metal recovery. The method comprises the steps that the gold-loaded carbon is washed with ionized water to remove ash, and is then filtered and heated to be activated; and then, the heated gold-loaded carbon is placed in a thiosulfate solution for desorption. The method has the advantages that the cost is low and a desorption reagent is safe and non-toxic; gold on the gold-loaded carbon can be effectively desorbed without destroying active carbon; and the purpose of cyclic utilization of active carbon can be achieved through re-modification of activated carbon.

Description

technical field [0001] The invention relates to a method for recovering gold on gold-loaded carbon in a thiosulfate system, belonging to the fields of hydrometallurgy and precious metal recovery. Background technique [0002] With the continuous and rapid development of the society, the awareness of environmental protection has become popular, and the research on green gold extraction technology has become the mission of the times. Compared with traditional gold extraction techniques such as cyanide method, halogen method, halide salt method, amalgamation method and lime sulfur method, the use of thiosulfate for gold leaching has the advantages of non-toxicity, environmental protection, safety, etc., and is easy to handle Copper, arsenic, antimony, carbon and other refractory gold ores by cyanidation. Therefore, thiosulfate gold extraction is a green gold extraction technology with unique prospects and in line with the theme of the times. With the progress of a lot of work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/24
CPCC22B3/24C22B11/04Y02P10/20
Inventor 字富庭陈云龙胡显智杜欢欢杨朋秦雪聪刘洋陈树梁林玥成会玲
Owner KUNMING UNIV OF SCI & TECH
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