Method for preparing high-purity silver from silver-containing waste liquid

A waste liquid and high-purity technology, applied in chemical instruments and methods, improvement of process efficiency, water/sludge/sewage treatment, etc., can solve the problem of low purity of the final product, achieve high silver recovery rate and good product quality , the effect of simple operation

Active Publication Date: 2011-05-25
惠州TCL环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned scheme is mainly suitable for processing silver-containing waste liquid produced in a single field, and is used for processing silver-containing waste liquid produced in multiple fields after being mixed containing cyanide, metal impurity ions Cu, Ni, Fe, Zn, thio The main disadvantage of sulfate, sulfite, silver-containing waste liquid with high COD and high ammonia nitrogen is that the purity of the final product is not high

Method used

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  • Method for preparing high-purity silver from silver-containing waste liquid
  • Method for preparing high-purity silver from silver-containing waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 1.3L of silver-containing waste liquid, add 2 times the amount of theoretically required silver sinking agent, stir for 30 minutes and then filter. The obtained silver-containing solid is first washed and filtered twice with 1:1 alcohol, and then replaced with hot water at 70°C Washing and filtering are carried out 3 times, and the waste water generated in the process is sent to the waste water treatment system for treatment and discharged after reaching the standard.

[0024] Put it into the reaction kettle after two stages of washing, then use 98% sulfuric acid, and then oxidize it for 30min at a temperature of 120°C, L / S=15:1, and the amount of surfactant added is 1.5% of the silver mud weight. , After the reaction is finished, filter and wash. During the reaction, the reaction kettle maintains negative pressure. The waste gas generated is absorbed and treated by the waste gas purification tower. The filter residue generated is discarded, and the silver-containin...

Embodiment 2

[0028] Take 1.5L of silver-containing waste liquid, add 3 times the amount of theoretically required silver sinking agent, stir for 30 minutes and then filter. The obtained silver-containing solid is first washed and filtered twice with 1:1 alcohol, and then hot water at 70°C is used. Washing and filtering are carried out 3 times, and the waste water generated in the process is sent to the waste water treatment system for treatment and discharged after reaching the standard.

[0029] Put it into the reaction kettle after two stages of washing, then use 60% nitric acid, and then oxidize it for 20min at a temperature of 100°C, L / S=25:1, and the amount of surfactant added is 5% of the silver mud weight. , After the reaction is finished, filter and wash. During the reaction, the reaction kettle maintains negative pressure. The waste gas generated is absorbed and treated by the waste gas purification tower. The filter residue generated is discarded, and the silver-containing solutio...

Embodiment 3

[0033] Take 1.0L of silver-containing waste liquid, add 2.5 times the amount of theoretically required silver sinking agent, stir for 30 minutes and then filter. The obtained silver-containing solid is first washed twice with 1:1 alcohol and filtered, and then replaced with hot water at 70°C Washing and filtering are carried out 3 times, and the waste water generated in the process is sent to the waste water treatment system for treatment and discharged after reaching the standard.

[0034] Put it into the reaction kettle after two stages of washing, then use 25% nitric acid, and then oxidize it for 60min at a temperature of 80°C, L / S=50:1, and the amount of surfactant added is 2.0% of the silver mud weight , After the reaction is finished, filter and wash. During the reaction, the reaction kettle maintains negative pressure. The waste gas generated is absorbed and treated by the waste gas purification tower. The filter residue generated is discarded, and the silver-containing ...

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Abstract

The invention relates to a method for preparing high-purity silver from silver-containing waste liquid. The method comprises the following steps of: adding a silver participating agent into the silver-containing waste liquid, and filtering and washing to obtain silver slime with high sliver content; adding acid and surfactant into the obtained silver slime for oxidation; adding sodium chloride solution into the obtained filtrate to participate the silver again; filtering and washing to obtain high-purity silver chloride solid; dissolving the silver chloride solid in any one of aqueous solution of ammonia and solution of ammonium carbonate; adding any one of hydrazine hydrate, ascorbic acid, and glucose into the obtained silver-containing solution for reduction; filtering and washing to obtain high-purity silver powder; and drying the pure silver powder and casting ingot to obtain a high-purity silver ingot. Equipment is simple, the method is easy to operate, investment is small, production cost is low, silver yield is high, a product has high quality, and the method can be easily industrially implemented.

Description

technical field [0001] The invention relates to a method for recycling waste liquid, in particular to a method for producing high-purity silver by utilizing silver-containing waste liquid. Background technique [0002] There are many varieties of silver-containing waste liquid, mainly from many fields such as silver electroplating industry, photographic industry, chemical analysis and laboratory. According to reports, the silver content in waste fixer solution alone reaches more than 3,000 tons every year in the world. Therefore, the recovery of silver from silver-containing waste liquid has been paid more and more attention at home and abroad. At present, representative methods in this field include metal replacement method, sodium borohydride method, sodium dithionite method, electrolysis method and sodium sulfide precipitation method. Among them, the metal replacement method, sodium borohydride, sodium dithionite method, and electrolysis method are suitable for processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/46C02F1/62C22B11/00
CPCY02P10/20
Inventor 王治军谭希发覃骏
Owner 惠州TCL环境科技有限公司
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