Silver anode mud treatment process

A silver anode slime and treatment process technology, which is applied in the field of silver anode slime treatment process, can solve the problems of economic loss, difficulty in miniaturization, low recovery rate, etc., achieve high comprehensive recovery degree, obvious economic benefits, and realize open-circuit recovery Effect

Inactive Publication Date: 2011-05-04
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has problems such as difficult control of leaching conditions, high price of leaching reagents, difficult separation of precious metals and base metals, difficult separation of platinum and palladium, and low recovery rate.
And this method is difficult to miniatu

Method used

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Embodiment 1

[0013] A treatment process for silver anode slime, leaching silver anode slime with 20% nitric acid solution (liquid-solid ratio 2:1) with mechanical stirring at 50°C, silver, palladium and base metals enter the solution, while gold and platinum remain in the slag middle. After the leaching slag is roasted to remove impurities, the gold anode plate is cast for electrolysis to obtain 1# gold, and the electrolyte can recover platinum. Adjust the pH of the leaching solution to 0.5, add a mixed precipitant A solution of 1 times the theoretical amount to selectively precipitate palladium at 70°C, and obtain a precipitated palladium residue; the liquid after the palladium precipitation is mainly AgNO 3 solution, back to silver electrolysis. The precipitated palladium residue is completely dissolved in aqua regia and then filtered. The filter residue is mainly AgCl precipitate, which is reduced with hydrazine hydrate to obtain coarse silver powder, which is then cast back into the s...

Embodiment 2

[0015] A treatment process for silver anode slime, leaching silver anode slime with 25% nitric acid solution (liquid-solid ratio 3:1) at 60°C with mechanical stirring, silver, palladium and base metals enter the solution, while gold and platinum remain in the slag middle. After the leaching slag is roasted to remove impurities, the gold anode plate is cast for electrolysis to obtain 1# gold, and the electrolyte can recover platinum. Adjust the pH of the leaching solution to 1.5, add a mixed precipitant A solution 1.2 times the theoretical amount to selectively precipitate palladium at 80°C, and obtain a precipitated palladium residue; the solution after the precipitated palladium is mainly AgNO 3 solution, back to silver electrolysis. The precipitated palladium residue is completely dissolved in aqua regia and then filtered. The filter residue is mainly AgCl precipitate, which is reduced with hydrazine hydrate to obtain coarse silver powder, which is then cast back into the s...

Embodiment 3

[0017] A treatment process for silver anode slime, leaching silver anode slime with 30% nitric acid solution (liquid-solid ratio 4:1) with mechanical stirring at 70°C, silver, palladium and base metals enter the solution, while gold and platinum remain in the slag middle. After the leaching slag is roasted to remove impurities, the gold anode plate is cast for electrolysis to obtain 1# gold, and the electrolyte can recover platinum. Adjust the pH of the leaching solution to 2.5, add a mixed precipitant A solution 1.4 times the theoretical amount to selectively precipitate palladium at 90°C, and obtain a precipitated palladium residue; the solution after the precipitated palladium is mainly AgNO 3 solution, back to silver electrolysis. The precipitated palladium residue is completely dissolved in aqua regia and then filtered. The filter residue is mainly AgCl precipitate, which is reduced with hydrazine hydrate to obtain coarse silver powder, which is then cast back into the s...

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Abstract

The invention relates to a silver anode mud treatment process. The process is characterized by leaching silver anode mud with nitric acid, wherein silver, palladium and base metals enter into solution while gold and platinum remain in residue; after roasting the leaching residue and removing impurities, using a cast gold anode plate to electrolyze the leaching residue to obtain gold No. 1 and using electrolyte for recycling platinum; regulating the pH value of leachate and adding mixed precipitator A solution to selectively precipitate palladium to obtain palladium precipitate residues; solution after palladium precipitation mainly being AgNO3 solution and returning the AgNO3 solution to undergo silver electrolysis; dissolving the palladium precipitate residues with aqua regia and filtering the dissolved solution to obtain the filter residue which is mainly AgCl, reducing the filter residue with hydrazine hydrate to obtain crude silver powder and returning the crude silver powder to a cast silver anode plate; and concentrating and carrying out ammonium on the solution after dissolution to obtain (NH4)2PdCl6 precipitate, dissolving the (NH4)2PdCl6 precipitate with ammonia and acidizing the (NH4)2PdCl6 precipitate with hydrochloric acid to obtain Pd(NH3)2Cl2 precipitate, then reducing the Pd(NH3)2Cl2 precipitate with hydrazine hydrate and then drying the reduction product to obtain spongy palladium, wherein the produced filtrate is returned to the concentration process. The invention has the advantages of less precious metal loss, low cost, strong practicability, high comprehensive recoverability and obvious economic benefit.

Description

technical field [0001] The invention relates to a treatment process of silver anode slime, which belongs to the field of nonferrous metal hydrometallurgy. Background technique [0002] Electrolytic refining is a common method for preparing high-purity metals. For example, the electrolytic refining process of silver uses crude silver as the anode, titanium plate as the cathode, and silver nitrate aqueous solution as the electrolyte, with a DC voltage of 1.5-3.5V and a current of 250-300A / m 2 Refining under certain conditions can obtain 99.99% silver. [0003] Before electrolysis, crude silver generally contains various impurities such as Au, Pt, Pd and base metals Pb, Cu, Bi. During the electrolysis process, most of the gold and platinum group metals whose electrode potential is higher than that of silver will not dissolve and precipitate, and some base metal impurities with a lower electrode potential than silver will form oxides or basic salts and also precipitate. The m...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06C25C1/20C22B11/00
CPCY02P10/20
Inventor 谢兆凤张圣南马辉曹永贵
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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