Method for preparing high pure gold and enriching silver, platinum and palladium from silver anode mud

A silver anode slime and pure gold technology, applied in the direction of improving process efficiency, can solve the problems of low recovery rate, many equipment, long process flow, etc., and achieve the effect of increased gold content, high removal rate and simple operation

Active Publication Date: 2016-11-16
ZIJIN MINING GROUP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing high-purity gold from silver anode slime and efficiently enriching silver, platinum and palladium, aiming to solve the problem of difficult control of silver anode slime leaching conditions, high price of leaching reagents, many equipment involved, Disadvantages of long process flow, low recovery rate, and difficult miniaturization of the method

Method used

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  • Method for preparing high pure gold and enriching silver, platinum and palladium from silver anode mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, Au62%, Ag27.4%, Pt0.09%, and Pd0.64% in copper-silver anode slime are treated, and the treatment process and treatment effect are as follows:

[0032] (1) Put the silver anode slime in the reaction kettle for nitric acid leaching to separate silver, control the mass concentration of nitric acid solution to 25%, the liquid-solid ratio according to the volume and mass ratio L:Kg is 5:1, the temperature is 90°C, the time is 7h, leaching After filtration, obtain silver-separating liquid and silver-separating slag, Au95.8%, Ag2.4%, Pt0.04%, Pd0.03% in the silver-separating slag;

[0033] (2) Add sodium chloride to the silver separation solution obtained in step (1) for silver precipitation, the temperature is 50-65°C, the time is 0.3-1h, no white precipitate is the reaction end point, and silver chloride precipitation and precipitation are obtained after filtration. Silver liquid;

[0034] (3) Add iron powder to the silver chloride precipitate obtained in s...

Embodiment 2

[0040] Au55.1%, Ag29.8%, Pt0.13%, Pd1.0% in the copper-silver anode slime treated in this example, the treatment process and effect are as follows:

[0041] (1) Put the silver anode slime in the reaction kettle for nitric acid leaching and silver separation, control the mass concentration of nitric acid solution to 25%, the liquid-solid ratio according to the volume and mass ratio L:Kg is 4:1, the temperature is 85°C, the time is 6h, and the leaching After filtration, obtain the silver separation liquid and the silver separation slag, in the silver separation slag, Au90.5%, Ag4.3%, Pt0.05%, Pd0.13%;

[0042] (2) Add sodium chloride to the silver separation solution obtained in step (1) for silver precipitation, the temperature is 50-65°C, the time is 0.3-1h, no white precipitate is the reaction end point, and silver chloride precipitation and precipitation are obtained after filtration. silver liquid;

[0043] (3), the silver chloride precipitate obtained in step (2) is repla...

Embodiment 3

[0049] Au59.3%, Ag29.1%, Pt0.09%, Pd0.69% in the copper-silver anode slime treated in this example, the treatment process and effect are as follows:

[0050] (1) Put the silver anode slime in the reaction kettle for nitric acid leaching to separate silver, control the mass concentration of nitric acid solution to 25%, the liquid-solid ratio according to the volume and mass ratio L:Kg is 3:1, the temperature is 85°C, the time is 6h, and the leaching After filtration, obtain silver-separating liquid and silver-separating slag, Au90.8%, Ag4.3%, Pt0.08%, Pd0.17% in the silver-separating slag;

[0051] (2) Add sodium chloride to the silver separation solution obtained in step (1) for silver precipitation, the temperature is 50-65°C, the time is 0.3-1h, no white precipitate is the reaction end point, and silver chloride precipitation and precipitation are obtained after filtration. silver liquid;

[0052] (3) The silver chloride precipitate obtained in step (2) is replaced by addin...

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Abstract

The invention discloses a method for preparing high pure gold and enriching silver, platinum and palladium from silver anode mud. The process of separating silver with nitric acid, recycling silver, platinum and palladium with silver-enriched liquid, decomposing silver separating slag with aqua regia and preparing high pure gold with a one-time unsaturation reduction method is adopted and comprises the steps: leaching the silver anode mud with nitric acid to obtain separated silver, adding sodium chloride into the silver separating liquid to deposit the silver to obtain silver chloride sediment and silver depositing liquid, adding iron powder into the silver chloride sediment for replacement, returning the crude silver back to a Kaldo furnace for melting, and adding sodium hydrogen sulfite into the silver depositing liquid to reduce, deposit and recycle platinum and palladium; performing gold separating on the silver separating slag with aqua regia to obtain gold separating liquid and gold separating slag, performing the iron powder replacement step on the gold separating slag, adding the sodium hydrogen sulfite into the gold separating liquid to perform unsaturation reduction to obtain gold powder and gold depositing liquid, washing, drying and ingotting the gold powder to obtain a product gold ingot, and adding the sodium hydrogen sulfite into the gold depositing liquid to reduce and recycle the platinum and palladium for the second time to obtain the crude gold powder, and returning back to the previous steps. The method solves the problems of long leaching flow, high agent cost, complex operation, more devices and low recycle rate of the silver anode mud.

Description

technical field [0001] The present invention relates to a noble metal electrolytic refining method, in particular to a method for preparing high-purity gold from silver anode slime and enriching silver, platinum and palladium, in particular to a method for recovering silver, platinum and palladium from silver nitric acid separation-silver-enriched liquid A method for preparing high-purity gold from silver slag. Background technique [0002] Electrorefining is a common method for producing high-purity metals. During the electrolytic refining process of crude silver, the gold and platinum group metals whose electrode potential is positive compared with silver are not dissolved and enter into the anode slime, meanwhile some base metal impurities whose electrode potential is negative than silver will also precipitate and enter into the anode slime due to the formation of oxides or basic salts. Anode slime, usually the main chemical components of silver anode slime are Au55-66%,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/007C22B11/042Y02P10/20
Inventor 衷水平苏秀珠吴健辉王俊娥林泓富张焕然熊家春张永锋刘建强张宏宪陈杭
Owner ZIJIN MINING GROUP
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