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Method for recovering silver from silver-contained waste material

A technology of waste and waste residue, which is applied in the field of silver recovery from silver-containing waste, to achieve the effects of fast reduction, high purity and cost saving

Active Publication Date: 2013-03-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, so far, there is no more environmentally friendly green process in the method of recovering silver from silver-containing waste, that is, a green process in which the precipitant can be recycled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 200g of spent silver catalyst with a silver content of 14wt%, add 90ml of nitric acid with a molar concentration of 3.5M, react at a temperature of 50°C for 30min, filter and wash, collect the filtrate in a 250ml three-necked reaction flask, and introduce 0.15 mol of acetylene gas; separate the precipitation of silver acetylene, slowly add 0.52mol of dimethylhydrazine to the precipitate, and stir thoroughly until the end of the reaction; simultaneously introduce the gas generated by the reaction into another solution containing silver ions, and absorb the acetylene gas generated by the reaction . After the reaction was finished, the silver powder generated by the reaction was filtered and washed, and dried to obtain 27.2 g of the silver powder.

Embodiment 2

[0034] Get 100g of spent silver catalysts with a silver content of 28wt%, add 95ml of 3.5M nitric acid, react at room temperature for 50min, filter and wash, collect the filtrate in a 250ml three-necked reaction flask, and introduce 0.52mol of acetylene gas through a flow meter; separate For silver acetylene precipitation, slowly add 0.52 mol of dimethylhydrazine to the precipitation, stir well until the reaction is over; simultaneously introduce the gas generated by the reaction into another solution containing silver ions, and absorb the acetylene gas generated by the reaction. After the reaction was finished, the silver powder generated by the reaction was filtered and washed, and dried to obtain 27.3 g of the silver powder.

Embodiment 3

[0036] Take 1000g of silver-containing waste residue (other components are mainly inert alumina) with a silver content of 1wt%, add 92.5ml of 1M dilute nitric acid and react at room temperature for 50min, filter and wash, collect the filtrate in a 250ml three-necked reaction bottle, and pass through the flow Introduce 0.05 mol of acetylene gas; separate the silver acetylene precipitate, slowly add 0.19 mol of dimethylhydrazine to the precipitate, stir well until the reaction is over; simultaneously introduce the gas generated by the reaction into another solution containing silver ions, and absorb the reaction to form of acetylene gas. After the reaction was finished, the silver powder generated by the reaction was filtered and washed, and dried to obtain 9.7 g of silver powder.

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PUM

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Abstract

The invention discloses a method for recovering silver from a silver-contained waste material. The method comprises the following steps: (1) contacting the silver-contained waste material with an acid solution capable of dissolving silver, thereby dissolving silver out of the silver-contained waste material and filtering to obtain a silver ion-contained solution; (2) contacting acetylene with the silver ion-contained solution, thereby forming an acetylene silver precipitate; and (3) contacting the acetylene silver precipitate formed in step (2) with dimethylhydrazine, thereby forming metallic silver and acetylene. With the application of the method provided by the invention, a precipitator and the acetylene can be recycled, so that the environmental protection is enhanced and the cost is saved.

Description

technical field [0001] The invention relates to a method for recovering silver, in particular to a method for recovering silver from silver-containing waste. Background technique [0002] Recovery of metallic silver from silver-containing waste has very good economic value. At present, the methods of recovering silver from silver-containing waste mainly include fire method and wet method. Because the fire method consumes a lot of energy, produces pollution and the recovery rate is not high, so the wet method is currently used more. The wet method generally uses an appropriate method to dissolve the silver first, and then transfers the solid silver to the solution before extracting it. Dissolution methods include concentrated sulfuric acid dissolution method, nitric acid dissolution method, strong alkali dissolution method, thiourea dissolution method, etc. [0003] Whether it is silver compound precipitation or silver (coordination) ions in the solution, it is more conven...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 史建公张敏宏赵桂良张毅刘志坚张新军史建新罗道威钟健李卫红赵立红苑志伟殷喜平杜宏斌蒋绍洋伊红亮
Owner CHINA PETROLEUM & CHEM CORP
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