Method for extracting refined gold from palladium-silver-containing anode mud

An anode slime and palladium-silver technology is applied in the field of purifying gold from high-palladium-silver anode slime, which can solve the problems of increased material return, low gold direct yield, and reduced gold reduction rate, and achieves short process structure and fast reaction. Efficient and responsive environment

Inactive Publication Date: 2015-03-25
JINCHUAN GROUP LIMITED
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  • Claims
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Problems solved by technology

If the content of palladium in the silver anode slime is too high, the concentration of palladium in the gold separation solution will be high, and the oxidation-reduction potential of palladium is closer to that of gold, which will easily cause palladium to precipitate during the reduction process. Generally, the method of increasing the reduction terminal potential is used in production. method to control the palladium content in the gold powder, but this will reduce the gold reduction rate, the gold direct recovery rate is low, and the return material will increase, which will greatly increase the gold refining cost

Method used

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  • Method for extracting refined gold from palladium-silver-containing anode mud

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Experimental program
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Effect test

Embodiment 1

[0019] (1) First put 200kg of palladium-containing 4% silver anode slime into a 1000L glass-lined reactor for hydrochloric acid pre-soaking to remove impurities. The liquid-solid ratio is 3:1, the concentration of hydrochloric acid is 2.5mol / L, the temperature is 75°C, and the reaction time is 3h , filter after completion of the reaction, the filtrate is discharged, and the filter cake is prepreg, weighing 180kg.

[0020] (2) Dissolve the prepreg slag in aqueous solution by chlorination, the liquid-solid ratio is 5:1, the concentration of hydrochloric acid is 2.8mol / L, the temperature is 85°C, the dissolution time is 8h, after the reaction is completed, filter, and the filtrate contains 8.2g / L palladium The gold separation solution, the filter cake is silver chloride slag, and the silver chloride slag is reduced by iron powder and returned to the previous process for processing.

[0021] (3) Raise the temperature of the gold separation solution to 80°C to catch chlorine, react...

Embodiment 2

[0025] (1) First put 250kg of palladium-containing 4.2% silver anode slime into a 1000L glass-lined reactor for hydrochloric acid pre-soaking to remove impurities. The liquid-solid ratio is 3:1, the concentration of hydrochloric acid is 2.5mol / L, the temperature is 75°C, and the reaction time is 4h , filter after completion of the reaction, the filtrate is discharged, and the filter cake is prepreg, weighing 220kg.

[0026] (2) Dissolve the prepreg slag in an aqueous solution with a liquid-to-solid ratio of 4:1, a hydrochloric acid concentration of 2.9mol / L, a temperature of 85°C, and a dissolution time of 10 hours. After the reaction is completed, filter and the filtrate contains palladium at a rate of 10.6g / L. The gold separation solution, the filter cake is silver chloride slag, and the silver chloride slag is reduced by iron powder and returned to the previous process for processing.

[0027] (3) Raise the temperature of the gold separation solution to 85°C to catch chlori...

Embodiment 3

[0031] (1) First put 150kg of palladium-containing 3.5% silver anode sludge into a 1000L glass-lined reactor for hydrochloric acid pre-soaking to remove impurities. The liquid-solid ratio is 4:1, the concentration of hydrochloric acid is 2mol / L, the temperature is 80°C, and the reaction time is 5h. After the reaction is completed, filter, and the filtrate is discharged, and the filter cake is prepreg, weighing 130kg.

[0032] (2) Dissolve the prepreg slag in an aqueous solution with a liquid-solid ratio of 6:1, a hydrochloric acid concentration of 2.9mol / L, a temperature of 90°C, and a dissolution time of 10 hours. After the reaction is completed, filter and the filtrate contains 6.6g / L of palladium. Gold separation liquid, the filter cake is silver chloride slag, and the silver chloride slag is reduced by iron powder and returned to the previous process for processing.

[0033] (3) Warm up the gold separation solution to 90°C for chlorine removal, react for 1 hour, then add d...

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Abstract

The invention provides a method for extracting refined gold from palladium-silver-containing anode mud, relates to the field of noble metal wet metallurgy, and particularly relates to a method for purifying the gold from the palladium-silver-containing anode mud. The method mainly comprises the following steps: adding the palladium-silver-containing anode mud into hydrochloric acid and carrying out chlorination dissolving; carrying out temperature rising type chlorine removing on filtered parting liquid; then adding dimethylglyoxime to carry out palladium sedimentation and impurity removal; after reaction is finished, carrying out precision filtering, wherein filtrate is gold raw liquid; introducing choline into the gold raw liquid and increasing electric potential; when the electric potential is up to more than 1000mV, stopping the introducing of the choline; adding a saturated sodium hydrogen sulfite solution into the gold raw liquid and reducing; when the electric potential is up to 620mV-630mV, stopping the reducing; and filtering after cooling, and further recycling valuable metal from the filtrate, wherein a filter cake is reduced gold powder. According to the process, the impurity palladium removing rate is high, the valuable metal can be comprehensively recycled, a flow structure is simple and the cost is low. When dimethylglyoxime is used for carrying out palladium sedimentation operation, the reaction is environmentally-friendly; and toxic and harmful gas is not generated and the reaction is rapid and efficient.

Description

technical field [0001] A method for extracting refined gold from palladium-containing silver anode slime relates to the field of precious metal hydrometallurgy, in particular a method for purifying gold from high palladium-containing silver anode slime. Background technique [0002] At present, the more advanced process of wet gold extraction from silver anode slime is the process of presoaking silver anode slime—chlorination of aqueous solution to separate gold—gold reduction—qualified gold powder ingot casting. The reducing agent used for gold reduction is generally any one of sodium sulfite, sodium bisulfite, oxalic acid, and sulfur dioxide, and the reduction end point is controlled by potential. If the content of palladium in the silver anode slime is too high, the concentration of palladium in the gold separation solution will be high, and the oxidation-reduction potential of palladium is closer to that of gold, which will easily cause palladium to precipitate during th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/06C22B7/00
CPCY02P10/20
Inventor 马玉天陈大林黄虎军刘益民代建军刘世和
Owner JINCHUAN GROUP LIMITED
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