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Novel leaching process of extracting precious metals such as gold, silver and the like from silver separating residues

A precious metal and silver slag separation technology, which is applied in the field of precious metal leaching and extraction technology, can solve the problems of difficulty in recycling, inability to effectively comprehensively recover precious metals and valuable metals, and increase the burden of anode slime treatment procedures.

Inactive Publication Date: 2013-10-02
工信华鑫科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Silver separation slag is a kind of industrial waste obtained from copper anode slime through low-temperature oxidation roasting-sulfuric acid solution leaching copper, selenium, tellurium-leaching slag chlorination gold-leaching gold slag ammonia leaching silver process, which still contains a small amount of silver, Precious metals such as gold, platinum, and palladium have certain comprehensive utilization value, but due to the complex composition of the silver-separated slag, low precious metal content, and difficulty in recycling, some smelters directly return the silver-separated slag to the anode slime treatment process or directly return Pyrochemical extraction of lead and antimony in lead and antimony smelters, these treatment methods not only cannot effectively recover the precious metals and valuable metals, but also increase the burden on the anode slime treatment process

Method used

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  • Novel leaching process of extracting precious metals such as gold, silver and the like from silver separating residues

Examples

Experimental program
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Effect test

example 1

[0017] Put 140g of chlorinated silver slag into 800ml of 3mol / L hydrochloric acid, add 10g of sodium chloride, heat for 2h, and most of the gold in the silver slag is transferred to the solution. Cool and filter to obtain about 100g of leaching residue and 800ml of leaching solution. The gold leaching rate is about 98.5%. Add 1g of pure copper powder to the leaching solution, react for 4 hours, and filter to obtain 1.45g of precious metal powder. The leached residue was added to 1000ml of 0.2mol / L sodium carbonate solution, and the conversion reaction was carried out at 40°C for 3h. After cooling and filtering, the filtrate is converted and reused next time, and the leached residue is added to 500ml of 2mol / L sodium sulfite solution, heated and stirred for 3 hours. Cool and filter to obtain about 96.5g of filter residue that can be used for lead-antimony smelting, add 5g of pure copper powder to 500ml of silver leaching solution, react for 4h, and filter to obtain 6.3g of mixe...

example 2

[0019] Put 140g of chlorinated silver slag into 800ml of 6mol / L hydrochloric acid, add 10g of sodium chloride, heat for 2h, and most of the gold in the silver slag is transferred to the solution. Cool and filter to obtain about 95g of leaching residue and 800ml of leaching solution. The gold leaching rate is about 98.5%. Add 1g of pure copper powder to the leaching solution, react for 4 hours, and filter to obtain 1.52g of precious metal powder. The leached residue was added to 1000ml of 0.2mol / L sodium carbonate solution, and the conversion reaction was carried out at 40°C for 3h. After cooling and filtering, the filtrate is converted and reused next time, and the leached residue is added to 500ml of 2mol / L sodium sulfite solution, heated and stirred for 3 hours. Cool and filter to obtain about 96.5g of filter residue that can be used for lead-antimony smelting, add 5g of pure copper powder to 500ml of silver immersion solution, react for 4h, and filter to obtain 6.15g of mix...

example 3

[0021] Put 140g of chlorinated silver slag into 800ml of 2.5mol / L sulfuric acid, add 30g of sodium chloride, heat for 4h, and most of the gold in the silver slag is transferred to the solution. Cool and filter to obtain about 106g of leaching residue and 800ml of leaching solution. The gold leaching rate is about 98.1%. Add 1g of pure copper powder to the leaching solution, react for 4 hours, and filter to obtain 1.45g of precious metal powder. The leached residue was added to 1000ml of 0.2mol / L sodium carbonate solution, and the conversion reaction was carried out at 40°C for 3h. After cooling and filtering, the filtrate is converted and reused next time, and the leached residue is added to 500ml of 2mol / L sodium sulfite solution, heated and stirred for 3 hours. Cool and filter to obtain about 96.5g of filter residue that can be used for lead-antimony smelting, add 5g of pure copper powder to 500ml of silver leaching solution, react for 4 hours, and filter to obtain 6.35g of ...

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Abstract

The invention discloses a method for extracting precious metals such as gold, silver and the like from silver separating residues and relates to a method for recovering the precious metals such as gold, silver and the like from solid residues obtained after metals such as Se, Cu, Te, Au, Ag and the like are separated and extracted from copper anode slime. The method is characterized by comprising the following steps of: firstly adding sodium chloride into industrial inorganic acid to leach anode slime, directly adding copper powder into the filtrate to reduce the precious metals such as gold, silver and the like, adding a sodium carbonate solution into the filter residue to convert the slightly soluble silver in the filter residue into silver carbonate, adding a sodium sulfite solution to leach, and adding the copper powder into the obtained filtrate to reduce the precious metals such as silver and the like. The method disclosed by the invention is capable of comprehensively recovering and concentrating the precious metals such as gold, silver, platinum, palladium and the like from the anode slime and is high in gold and silver recovery rate and simple in equipment at the same time, so that the method is suitable for large-scale industrial production.

Description

Technical field: [0001] The invention relates to a process for leaching and extracting precious metals such as gold, silver, platinum, and palladium from chlorinated silver-separating slag. Background technique: [0002] Silver separation slag is a kind of industrial waste obtained from copper anode slime through low-temperature oxidation roasting-sulfuric acid solution leaching copper, selenium, tellurium-leaching slag chlorination gold-leaching gold slag ammonia leaching silver process, which still contains a small amount of silver, Precious metals such as gold, platinum, and palladium have certain comprehensive utilization value, but due to the complex composition of the silver-separated slag, low precious metal content, and difficulty in recycling, some smelters directly return the silver-separated slag to the anode slime treatment process or directly return Pyrochemical extraction of lead and antimony in lead and antimony smelters, these treatment methods not only canno...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/04C22B3/46C22B11/00
CPCY02P10/20
Inventor 邱建宁徐纯理刘军飞
Owner 工信华鑫科技有限公司
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