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Treatment method for extracting gold from high-impurity silver anode slime

A technology of silver anode slime and treatment method, which is applied in the fields of non-ferrous metallurgy and precious metal hydrometallurgy, can solve the problems of unattainable gold purity, complicated treatment process, long treatment time, etc., and achieves high reaction efficiency, reliable process and impurity removal rate. high effect

Active Publication Date: 2017-05-31
CHENZHOU CITY JINGUI SILVER IND CO LTD
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Problems solved by technology

[0005] On December 2, 2015, China Invention Patent Application Publication No. CN 105112669 A, in the comprehensive recovery method of platinum and palladium in silver anode slime proposed by Yunnan Tin Industry Group (Holdings) Co., Ltd. Lead Industry Branch, the silver anode slime Silver is leached with nitric acid, the leaching residue is chlorinated to separate gold, and bismuth is removed from the gold separation solution, and then gold is reduced. In order to obtain high-purity gold, the chlorination gold separation solution needs to be cleaned of impurities. The process is cumbersome and the processing time is long.
[0006] On November 16, 2016, China Invention Patent Application Publication No. CN 106119554 A was proposed by Zijin Mining Group Co., Ltd.; in the method for preparing high-purity gold from silver anode slime and enriching silver, platinum and palladium, the silver anode slime The silver is leached and separated with nitric acid, and the silver-separated slag is gold-separated with aqua regia to obtain a gold-separated solution and a gold-separated slag, and sodium bisulfite is added to the gold-separated solution for reduction to obtain a reduced gold powder, which is then washed, dried, and cast to obtain a gold ingot. Although the obtained gold ingots are of high purity, the processing procedure is complicated and the processing scale tends to be miniaturized
[0007] In actual production, some silver anode slimes often have low gold content due to various reasons, usually less than 10%, and relatively high impurities. Usually, only acid leaching is used to remove impurities, which leads to further removal of impurities in subsequent processes, and obtains The purity of gold often does not reach the IC-Au99.99 standard

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  • Treatment method for extracting gold from high-impurity silver anode slime

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Embodiment 1

[0025] The treatment method for gold extraction from high-impurity silver anode slime, the specific steps are as follows:

[0026] (1) First wash 3kg of high-impurity silver anode slime produced by silver electrolysis, including Au10.7%, Ag, 5.54%, Cu1.13%, Fe2.01%, Pb1.97%, Sb1.96% , Si2.17%, liquid-solid ratio 3:1, temperature 90°C, stirring time 0.3h, and then filter to obtain washing slag, and the washing liquid is returned to silver electrolysis;

[0027] (2) Add 68% nitric acid to the washing slag obtained in step (1) for leaching, the liquid-solid ratio is 2:1, the temperature is 100°C, the reaction time is 0.2h, and then filtered to obtain the nitric acid leaching slag, and the nitric acid leaching solution is returned to the silver system to recover silver and other valuable metals;

[0028] (3) The nitric acid leaching residue obtained in step (2) was added to 98% concentrated sulfuric acid for leaching, the liquid-solid ratio was 2:1, the temperature was 100°C, the...

Embodiment 2

[0033] The treatment method for gold extraction from high-impurity silver anode slime, the specific steps are as follows:

[0034] (1) First wash 1kg of high-impurity silver anode slime produced by silver electrolysis, including Au11.3%, Ag, 6.12%, Cu1.98%, Fe1.96%, Pb1.55%, Sb2.64% , Si2.02%, liquid-solid ratio 2:1, temperature 95°C, stirring time 0.3h, and then filter to obtain washing slag, and the washing liquid is returned to silver electrolysis;

[0035] (2) Add 65% nitric acid to the washing slag obtained in step (1) for leaching, the liquid-solid ratio is 3:1, the temperature is 98°C, the reaction time is 0.4h, and then filtered to obtain the nitric acid leaching slag, and the nitric acid leaching solution is returned to the silver system to recover silver and other valuable metals;

[0036] (3) Add the nitric acid leaching residue obtained in step (2) to 98% concentrated sulfuric acid for leaching, the liquid-solid ratio is 2:1, the temperature is 100°C, the reaction...

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Abstract

The invention discloses a treatment method for extracting gold from high-impurity silver anode slime. The treatment method mainly comprises the following steps: high-impurity silver anode slime is washed to remove soluble compounds; then base metals are removed through acid digestion; and after that, alkaline oxidation leaching, gold dissolution, reduction and washing are performed to obtain 99.99% gold dust. The treatment method is high in impurity removal rate, can comprehensively recover valuable metals and is reliable in process.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, relates to the field of precious metal hydrometallurgy, in particular to a treatment method for gold extraction from silver anode slime with high impurities. Background technique [0002] In the process of electrolytic refining of crude silver, the metal whose electrode potential is positive than silver is not dissolved and enters the anode slime. At the same time, part of the base metal impurities whose electrode potential is negative than silver will also precipitate and enter the anode due to the formation of oxides or basic salts. mud. This kind of silver anode slime usually contains relatively high gold and silver, and a small amount of impurities. It is the main raw material for extracting gold and other valuable metals. [0003] The traditional methods for extracting gold from silver anode slime mainly include: concentrated sulfuric acid leaching method, nitric acid oxidation method, ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/007C22B11/042Y02P10/20
Inventor 粟明辉杨跃新李环
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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