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Method for recycling gold and silver from silver separating residues of copper anode slime

A technology for copper anode slime and silver-separating slag, which is applied in the direction of improving process efficiency, can solve the problems of not considering environmental protection, environmental pollution, waste of valuable metals, etc. Effect

Active Publication Date: 2013-02-27
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A small number of manufacturers sell it to some specialized precious metal recycling companies for processing and recycling, and extract some precious metal elements (patent applications 90103200.X, 97105925.X, 200710303815.7). This extensive recycling wastes some valuable metals in the slag , and environmental protection is not considered in the process, which not only wastes resources but also causes new environmental pollution
[0006] As a mature gold leaching process, the cyanidation method has been used by people for a long time, but because the traditional cyanidation method produces a large amount of cyanide-containing wastewater, it causes great harm to the staff and the environment, and the gold dissolution rate is relatively low. Slow, long production cycle

Method used

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  • Method for recycling gold and silver from silver separating residues of copper anode slime

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Experimental program
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Effect test

Embodiment 1

[0020] The silver slag and sodium thiosulfate of the copper anode slime are mixed and ball milled, wherein the mass ratio of the silver slag and sodium thiosulfate of the copper anode slime is 10:1, and the ball milling time is 1 hour to obtain a ball mill; The material and the reaction solvent are loaded into the hydrothermal reaction kettle, wherein the mass ratio of the ball mill material and the reaction solvent is 1:1, the total volume of the ball mill material and the reaction solvent accounts for 20% of the volume of the hydrothermal reaction kettle, and the hydrothermal reaction temperature is 140°C , the reaction time is 1 hour, wherein the reaction solvent is composed of copper sulfate and aqueous ammonia solution, the concentration of copper sulfate is 3g / L, and the concentration of 20% ammonia water is 50mL / L (20% ammonia water); the hydrothermal product is filtered to obtain hydrothermal slag and Hydrothermal liquid, hydrothermal slag centralized treatment; add thi...

Embodiment 2

[0022] The silver slag of copper anode slime and sodium thiosulfate are mixed and ball milled, wherein the mass ratio of silver slag and sodium thiosulfate of copper anode slime is 10:3, and the ball milling time is 2 hours to obtain ball mill; ball mill The material and the reaction solvent are loaded into the hydrothermal reaction kettle, wherein the mass ratio of the ball mill material and the reaction solvent is 1:1.5, the total volume of the ball mill material and the reaction solvent accounts for 25% of the volume of the hydrothermal reaction kettle, and the hydrothermal reaction temperature is 180°C , the reaction time is 4 hours, wherein the reaction solvent is composed of copper sulfate and aqueous ammonia solution, the concentration of copper sulfate is 8g / L, and the concentration of 20% ammonia water is 100mL / L (20% ammonia water); the hydrothermal product is filtered to obtain hydrothermal slag and Hydrothermal liquid, hydrothermal slag centralized treatment; add th...

Embodiment 3

[0024] The silver slag and sodium thiosulfate of the copper anode slime are mixed and ball milled, wherein the mass ratio of the silver slag and sodium thiosulfate of the copper anode slime is 10:2, and the ball milling time is 1.5 hours to obtain a ball mill; The material and the reaction solvent are loaded into the hydrothermal reaction kettle, wherein the mass ratio of the ball mill and the reaction solvent is 1:3, the total volume of the ball mill and the reaction solvent accounts for 40% of the volume of the hydrothermal reaction kettle, and the hydrothermal reaction temperature is 160°C , the reaction time is 2 hours, wherein the reaction solvent is composed of copper sulfate and aqueous ammonia solution, the concentration of copper sulfate is 5g / L, and the concentration of 20% ammonia water is 70mL / L (20% ammonia water); the hydrothermal product is filtered to obtain hydrothermal slag and Hydrothermal liquid, hydrothermal slag centralized treatment; Add thiourea dioxide ...

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Abstract

The invention relates to a method for recycling gold and silver from waste residues and particularly relates to a method for recycling gold and silver from silver separating residues of copper anode slime. The method specifically includes that the silver separating residues of the copper anode slime and sodium thiosulfate are subjected to mixing and ball-milling to obtain a ball-milling material; the ball-milling material and a reaction solvent are filled in a hydrothermal reaction still for hydrothermal reaction; and thiourea dioxide is added into a hydrothermal solution obtained by filtering a hydrothermal product for reduction reaction to obtain coarse gold and silver powders. Compared with methods in prior art, the method has the advantages that by means of the ball-milling and the hydrothermal reaction, leaching rates of the gold and the silver are greatly improved, the process is simple and easy to achieve, and raw materials are common, cheap and pollution-free.

Description

[0001] technical field [0002] The invention relates to a method for recovering gold and silver in waste slag, in particular to a method for wet recovery of gold and silver from copper anode slime and silver slag. [0003] Background technique [0004] Silver separation slag is the residue after extracting precious metals such as gold, silver, platinum, palladium and copper, selenium, tellurium and other valuable elements from copper anode slime. Copper anode slime is composed of elements with higher potential than copper and various substances insoluble in electrolyte during the electrolytic refining process. Its composition mainly depends on the composition of copper anode, casting quality and electrolysis technical conditions, and its yield is generally 0.2~0.8%; it usually contains Au, Ag, Cu, Pb, Se, Te, As, Sb, Bi, Ni, Fe, S, Sn, SiO 2 、A1 2 o 3 , platinum group metals and moisture. Anode slime derived from copper sulfide concentrate contains more Cu, Se, Ag, Pb,...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/14C22B3/44C22B11/00
CPCY02P10/20
Inventor 潘德安张深根李彬田建军郭斌
Owner UNIV OF SCI & TECH BEIJING
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