Method for directly purifying gold from silver anode slime through wet method comprehensive recovery

A silver anode slime, direct technology, applied in the field of wet comprehensive recovery of silver anode slime to directly purify gold, can solve the problems of capital backlog in the production cycle, etc., and achieve the effect of short process time.

Active Publication Date: 2016-11-02
CHENZHOU CITY JINGUI SILVER IND CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for directly purifying gold from silver anode slime by wet comprehensive recovery, which has high direct recovery rate and thorough separation, an

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  • Method for directly purifying gold from silver anode slime through wet method comprehensive recovery

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[0023] Example 1

[0024] Material composition: gold: 31.33%, silver: 36.04%, palladium: 0.26%;

[0025] The implementation of this material adopts the production process such as figure 1 , take 100g of material in nitric acid solution with a mass concentration of 40%, in a 2L laboratory acid-resistant reactor, the liquid-solid volume mass ratio is 5:1 mL / g, the temperature is 70°C, the reaction time is 5h, and after the reaction is completed, cool and filter , slowly add 15g of hydrazine hydrate to the reaction solution, the temperature is 35°C, react for 2 hours, and filter to obtain silver powder. Take the above leaching residue at a liquid-solid volume mass ratio of 6:1 mL / g, hydrochloric acid concentration of 120g / L, sodium chlorate addition of 15g / L, temperature 80°C, and filter after 4 hours of reaction to obtain the chlorinated leaching residue Silver powder was obtained through sodium sulfite leaching and formaldehyde reduction, and 30% lye was slowly added to the c...

Example Embodiment

[0028] Example 2

[0029] Material composition: gold: 37.56%, silver: 41.28%, palladium: 1.37%;

[0030] The implementation of this material adopts the production process such as figure 1 , take 100g of material in nitric acid solution with a mass concentration of 45%, in a 2L laboratory acid-resistant reactor, the liquid-solid volume mass ratio is 5:1 mL / g, the temperature is 75°C, the reaction time is 6h, and after the reaction is completed, cool and filter , slowly add 20g of hydrazine hydrate to the reaction solution, the temperature is 40°C, react for 2 hours, and filter to obtain silver powder. Take the above leaching residue at a liquid-solid volume mass ratio of 5:1 mL / g, hydrochloric acid concentration of 130g / L, sodium chlorate addition of 17g / L, temperature 85°C, and filter after 5 hours of reaction to obtain the chlorinated leaching residue Silver powder was obtained through sodium sulfite leaching and formaldehyde reduction, and 30% lye was slowly added to the c...

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Abstract

The invention relates to a method for directly purifying gold from silver anode slime through wet method comprehensive recovery. After an outer layer silver chloride wrappage of the silver anode slime is leached out through nitric acid, gold and palladium are leached out through chlorination, silver is leached out from leaching residues through sodium nitrite, and the silver and a former nitrate leachate are subjected to formaldehyde reduction together to obtain silver powder. A chlorination leachate is subjected to reduction to obtain 99.99% gold powder, and after-reduction liquid can be cycled to chlorination leaching or dissolution reduction after replacement to obtain palladium powder. The direct recovery rates reach 99% and 98% or above. The method is suitable for directly purifying the gold from the silver anode slime rich in gold and silver, the silver and palladium precious metals in the silver anode slime are recycled, and the problem of accumulation of a large number of funds due to an overlong production cycle in the recovery process of the silver anode slime of the gold and silver smelting industry is solved well.

Description

technical field [0001] The invention relates to a method for directly purifying gold by comprehensively recovering silver anode slime by wet method, which belongs to the field of nonferrous metal hydrometallurgy and secondary resource recovery. technical background [0002] At present, the treatment of silver anode slime at home and abroad is still treated by the chlorination method, leaching with hydrochloric acid and sodium chlorate, the silver enters the gold separation slag with AgCl, and the gold separation liquid uses oxalic acid or SO 2 Coarse gold powder is obtained by reduction, and then gold electrolysis is carried out, and platinum and palladium are replaced by liquid after reduction. But this method has the following two important problems: 1) Since part of the gold in the silver anode slime is wrapped in silver chloride, when the chloride system is directly leached, this part of the gold wrapped in silver chloride cannot be leached, seriously Affect the leachi...

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B3/10C22B3/06C22B3/12C22B3/44
CPCC22B3/06C22B3/10C22B3/12C22B3/44C22B7/007C22B7/008C22B11/044Y02P10/20
Inventor 覃小龙杨跃新李环张声龙
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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