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Method for extracting silver from silver sulfide copper

A silver sulfide and copper thiosulfate technology, applied in the field of silver extraction, can solve the problems of high cost of harmless treatment, unfriendly environment, high cost, etc., and achieve high recovery rate, high silver dissolution rate, and high application value.

Inactive Publication Date: 2019-07-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cyanide is a highly toxic compound, which is difficult to transport, high in cost, and unfriendly to the environment. The residual residue of silver-containing materials treated by cyanide has been classified as hazardous waste, and the cost of harmless treatment is huge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: measure 100mL concentration and be the copper thiosulfate Cu(S) of 0.05mol / L 2 o 3 ) n -2n+1 Solution, the solution is vacuumed, and then the dissolved oxygen of the solution is measured to be 0.2mg / L. Under the condition of 1°C, 0.1g silver copper sulfide (CuAgS) is added to the copper thiosulfate Cu(S 2 o 3 ) n -2n+1 In the solution reactor, adjust the pH of the solution to 2, rotate at 200r / min, start the stirring reaction, stop stirring after 10 minutes, filter and remove the copper sulfide precipitate and unreacted silver copper sulfide, and obtain a clear and transparent solution, that is, thiosulfate Silver sulfate solution, the filter residue was washed three times with a small amount of distilled water, then the cleaning solution was combined with the filtrate, and the volume was adjusted to 250mL. The silver concentration in the assay filtrate was 204mg / L, and the calculated silver solubility was 96.81%. The pH of the solution was adjusted t...

Embodiment 2

[0027] Embodiment 2: measure 500mL concentration and be 0.25mol / L copper thiosulfate Cu(S 2 o 3 ) n -2n+1 solution, fill it with nitrogen for 30min, measure the dissolved oxygen of the solution as 1mg / L, and slowly add copper thiosulfate Cu(S 2 o 3 ) n -2n+1 Add 7.69 g of silver copper sulfide (CuAgS) to the reactor of the solution, adjust the pH of the solution to 7, and start the stirring reaction at 200 r / min, stop stirring after 6 hours of reaction, filter and remove a small amount of insoluble matter to obtain a clear and transparent filtrate, and filter the residue with distilled water After cleaning for three times, the cleaning solution was combined with the filtrate, and the volume was adjusted to 1000mL. The silver concentration in the filtrate was tested to be 3920mg / L, and the calculated silver solubility was 96.29%. The pH of the solution was adjusted to 7, and 1.2×10 -5 mol / L dilute sulfuric acid activated zinc powder 9.44g, at room temperature, stirred and...

Embodiment 3

[0028] Embodiment 3: measure 100mL concentration and be 0.5mol / L copper thiosulfate Cu(S 2 o 3 ) n -2n+1 solution, fill it with nitrogen for 10min, measure the dissolved oxygen of the solution as 2mg / L, and slowly add copper thiosulfate Cu(S 2 o 3 ) n -2n+1 Add 5g of silver-copper sulfide (CuAgS) to the reactor of the solution, adjust the pH of the solution to 12, rotate at 200r / min, start the stirring reaction, stop stirring after 12 hours of reaction, filter and remove a small amount of insoluble matter to obtain a clear and transparent filtrate, and wash the filter residue with distilled water After three times, the cleaning solution was combined with the filtrate, and the volume was fixed to 250mL. The silver concentration in the filtrate was tested to be 10120mg / L, and the silver solubility was calculated to be 95.67%. The pH of the solution was adjusted to be 12, and 4×10 -5 mol / L dilute sulfuric acid activated zinc powder 9.136g, at room temperature, with magnetic...

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PUM

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Abstract

The invention discloses a method for extracting silver from silver sulfide copper, and belongs to the field of chemistry and chemical industry. Firstly, a cupric thiosulfate solution is vacuumed or filled with nitrogen to remove dissolved oxygen, the silver sulfide copper and the cupric thiosulfate solution are mixed and react for a certain time to obtain a solution containing silver thiosulfate,and then zinc powder activated by dilute sulfuric acid is used for replacing a silver element from the solution containing the silver thiosulfate. The method is simple in operation, high in silver dissolution rate (larger than 95%) and high in recovery rate (larger than 99%); and the method overcomes the problem that a conventional extraction method pollutes the environment and is not high in efficiency, and the method is environment-friendly, low in cost and high in application value.

Description

technical field [0001] The invention relates to a method for extracting silver from silver-copper sulfide, which belongs to the technical field of chemistry and chemical engineering. Background technique [0002] The conductivity and thermal conductivity of silver are the highest among all metals. At the same time, it has excellent ductility and plasticity. It is often used to make highly sensitive physical instrument components. And other industries have been widely used, has become an indispensable important material in industry and national defense construction. [0003] The conventional method for extracting silver is to use an aqueous solution of alkali metal cyanide as a solvent to extract silver from silver-containing materials, and then recover silver from the silver-containing solution. The methods for recovering silver from cyanide leachate are relatively mature, including metal replacement method, activated carbon adsorption method, ion exchange resin method, and...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCC22B11/04C22B7/006Y02P10/20
Inventor 崔毅琦董鹏蔡鑫
Owner KUNMING UNIV OF SCI & TECH
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