Method for recovering silver from silver-containing waste liquid

A technology of waste liquid and elemental silver, applied in the direction of improving process efficiency, can solve the problems of high energy consumption, low silver recovery rate, environmental pollution, etc., and achieve the effects of no environmental pollution, short processing time and simple process

Inactive Publication Date: 2012-05-23
陆生杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is not difficult to see in the above method of recovering silver from silver-containing waste liquid that the electrolysis method consumes a lot of energy and the silver recovery rate is low; while in the chemical method, higher temperature is required, energy consumption is relatively large, and the environment is harmful. more serious pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: A method for recovering silver from silver-containing waste liquid, wherein the silver-containing waste liquid is the waste liquid after use of the fixer. Under room temperature, sodium sulfide is configured into a sodium sulfide solution with a concentration of 20%, and the above-mentioned Na 2 Add the S solution to the waste fixer, stir while adding, and generate the silver-containing compound Ag 2 S precipitation; after the precipitation is complete, let it stand for 24 hours, and then add 1 to 2 drops of 20% Na to the supernatant. 2 S solution, test Ag + Whether it has been fully restored; to be Ag + After complete reduction, filter the Ag with vacuum suction filtration 2 S, dilute HNO with 0.1mol / l 3 Wash 2 to 3 times to remove impurities, and then wash 2 to 3 times with deionized water to remove residual HNO 3 , and the resulting Ag 2 The S precipitate was dried at 100°C into granules.

[0014] Grind the dried granular silver sulfide into fine...

Embodiment 2

[0015] Embodiment 2: A method for recovering silver from silver-containing waste liquid, wherein the silver-containing waste liquid is used silver-containing electroplating waste liquid. Under room temperature, NaCl is configured into a sodium chloride solution with a concentration of 30%, and the above-mentioned NaCl solution is added to the waste electroplating solution, and stirred while adding, to generate a silver-containing compound AgCl precipitation; after the precipitation is complete, let it stand for 24 hours, and then Add 1-2 drops of 30% NaCl solution dropwise to the supernatant to test for Ag + Whether it has been fully restored; to be Ag + After complete reduction, filter AgCl with reduced pressure suction filtration, dilute with 0.1mol / l HNO 3 Wash 2 to 3 times to remove impurities, and then wash 2 to 3 times with deionized water to remove residual HNO 3 , and the obtained AgCl precipitate was dried at 100° C. into granular form.

[0016] Put the dried granu...

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PUM

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Abstract

The invention discloses a method for recovering silver from silver-containing waste liquid. The method is advantaged in low processing temperature, simple technology, low production cost, short processing time, high production efficiency, no environmental pollution, and the like.

Description

technical field [0001] The invention relates to a method for recovering precious metals, in particular to a method for recovering silver from silver-containing waste liquid by using low-temperature plasma treatment technology. Background technique [0002] As we all know, silver is a precious metal with very high application value. In industrial production or some other chemical reaction processes, a large amount of silver-containing waste liquid will be produced, and the silver dissolved in the waste liquid will be discarded, which not only causes waste, but also causes environmental pollution. Therefore, it is undoubtedly a positive and meaningful thing to recover silver from silver-containing waste liquid, turn waste into treasure, and turn harm into profit. [0003] At present, the methods for recovering silver from silver-containing waste liquid can generally be divided into two categories: electrolytic method and chemical method. The electrolysis method uses silver-c...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 陆生杰
Owner 陆生杰
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