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Method for enriching and recovering gold (Au (S2O3) 23-) in thiosulfate solution

A thiosulfate and thiosulfate-containing technology, which is applied in the field of hydrometallurgy and precious metal recovery, can solve the problems of no application, low gold concentration, and difficulty in finding extraction agents, etc., achieving high recovery rate, simple operation, and applicable The effect of sex and flexibility

Active Publication Date: 2021-12-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main reasons is that the solvent extraction method is generally used in clarified liquids with higher concentrations of gold, but the thiosulfate system (Au(S 2 o 3 ) 2 3- ) The concentration of gold in the actual gold leaching solution is generally very low, and it is difficult to find a suitable extraction agent, so the solvent extraction method reclaims (Au(S 2 o 3 ) 2 3- ) in gold (Ⅰ) has almost no practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In this embodiment, polyether trihydric alcohol is used as the extractant to enrich and recover the thiosulfate solution (Au(S 2 o 3 ) 2 3- ) in gold (Ⅰ), comprising the following steps:

[0015] (1) The preparation volume is 100mL, the gold(I) ion concentration is 50mg / L, S 2 o 3 2- Au(S) with an ion concentration of 0.1mol / L 2 o 3 ) 2 3- The simulated solution was placed in a separatory funnel to keep the pH at 7.

[0016] (2) Add 1 mL of polyether triol to the solution in step (1) to carry out extraction reaction for 5 minutes. After the reaction is completed, stand still to separate the liquids to obtain a raffinate.

[0017] After the extraction experiment was completed, take two portions of 5mL raffinate, add 3mL 30% H 2 o 2 Oxidize for more than 15 minutes, then add 2 mL of 1:3 HCl to heat on the electric heating plate, add 3 drops of 10% KCl to dry after the solution becomes clear; dilute the dried sample to 25 mL with 5% aqua regia, and analyze the ...

Embodiment 2

[0019] In this embodiment, polyether trihydric alcohol is used as the extractant to enrich and recover the thiosulfate solution (Au(S 2 o 3 ) 2 3- ) in gold (Ⅰ), comprising the following steps:

[0020] (1) The preparation volume is 100mL, the gold(I) ion concentration is 50mg / L, S 2 o 3 2- Au(S) with an ion concentration of 0.1mol / L 2 o 3 ) 2 3- The simulated solution was placed in a separatory funnel to keep the pH at 9.

[0021] (2) Add 5 mL of polyether trihydric alcohol to the solution in step (1) to carry out extraction reaction for 10 minutes. After the reaction is completed, let it stand for liquid separation to obtain a raffinate, and keep the organic phase in the separatory funnel.

[0022] After the extraction experiment was completed, take two portions of 5mL raffinate, add 3mL 30% H 2 o 2 Oxidize for more than 15 minutes, then add 2 mL of 1:3 HCl to heat on the electric heating plate, add 3 drops of 10% KCl to dry the solution after it becomes clear; t...

Embodiment 3

[0024] In this embodiment, polyether trihydric alcohol is used as the extractant to enrich and recover the thiosulfate solution (Au(S 2 o 3 ) 2 3- ) in gold (Ⅰ), comprising the following steps:

[0025] (1) The preparation volume is 100mL, the gold(I) ion concentration is 50mg / L, S 2 o 3 2- Au(S) with an ion concentration of 0.1mol / L 2 o 3 ) 2 3- The simulated solution was placed in a separatory funnel to keep the pH at 11.

[0026] (2) Add 3 mL of polyether trihydric alcohol to the solution in step (1) for extraction reaction for 10 min. After the reaction is completed, stand still for liquid separation to obtain a raffinate.

[0027] After the extraction experiment was completed, take two portions of 5mL raffinate, add 3mL 30% H 2 o 2 Oxidize for more than 15 minutes, then add 2 mL of 1:3 HCl to heat on the electric heating plate, add 3 drops of 10% KCl to dry the solution after it becomes clear; the dried sample is diluted to 25 mL with 5% aqua regia, and the go...

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Abstract

The invention discloses a method for enriching and recycling gold (Au (S2O3) 23-) in a thiosulfate solution, and belongs to the technical field of precious metal recycling. According to the method, polyether triol is used as an extracting agent, and the polyether triol is added into the (Au (S2O3) 23-) solution, so that separation and enrichment of gold (I) ions in the (Au (S2O3) 23-) solution can be realized. According to the method, due to the use of the extracting agent, the gold (I) in the (Au (S2O3) 23-) solution is finally directly extracted from the system by polyether triol, and the enrichment recovery rate of the (Au (S2O3) 23-) is obviously improved; and the problems that in an adsorption method, activated carbon is low in affinity to gold, silica gel is small in particle size and difficult to separate are effectively solved. The operation process is simple and easy to control, the reagent is green and non-toxic, the cost is low, and the method is an efficient low-carbon recovery method of Au (S2O3) 23-) and has important significance on industrialization of a thiosulfate gold extraction technology.

Description

technical field [0001] The invention relates to a method for enriching and recovering gold (Au(S) in a thiosulfate solution 2 o 3 ) 2 3- ) method belongs to the technical field of hydrometallurgy and precious metal recovery. Background technique [0002] With the progress of the times and the development of the economy, the demand for gold is increasing year by year. However, at present, the leaching agent used in the mainstream gold extraction method - cyanidation method is cyanide, which is a highly toxic substance and seriously harmful to the environment and ecology. Therefore, non-cyanide gold extraction reagents and methods must be sought. In comparison, the thiosulfate method has many advantages such as environmental protection and fast leaching rate, and is considered to be an ideal non-cyanide gold extraction technology. However, the gold (Au(S 2 o 3 ) 2 3- ) is difficult to effectively recover, which limits the industrialization of thiosulfate gold extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B11/00
CPCC22B11/04Y02P10/20
Inventor 字富庭李烛娟胡显智陈云龙
Owner KUNMING UNIV OF SCI & TECH