Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of recovering silver for silver-containing waste liquid

A waste liquid and elemental silver technology, which is applied in the field of silver recovery from silver-containing waste liquid by plasma treatment technology, can solve the problems of high energy consumption, low silver recovery rate, environmental pollution, etc., and achieve no environmental pollution and short processing time , The effect of simple process

Inactive Publication Date: 2008-06-11
SUZHOU UNIV
View PDF6 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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 waste liquid after use of the fixing solution. At room temperature, configure sodium sulfide into a sodium sulfide solution with a concentration of 20%. 2 The S solution is added to the waste fixing solution and stirred while adding it to generate 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 in the upper clear night 2 S solution, test Ag + Whether it has been fully restored; waiting for Ag + After complete reduction, filter Ag with vacuum filtration 2 S, use 0.1mol / l dilute HNO 3 Wash 2~3 times to remove impurities, and then wash 2~3 times with deionized water to wash away residual HNO 3 , And the resulting Ag 2 The S precipitate is dried into granules at 100°C.

[0014] Grind the dried granular silver sulfide into fine powder and place it in a p...

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. Prepare NaCl into a sodium chloride solution with a concentration of 30% at room temperature. Add the above NaCl solution to the waste electroplating solution and stir while adding to produce a silver-containing compound AgCl precipitate; after the precipitation is complete, let it stand for 24 hours, and then Add 1 to 2 drops of 30% NaCl solution in the upper clear night to test Ag + Whether it has been fully restored; waiting for Ag + After complete reduction, filter AgCl with vacuum filtration method, use 0.1mol / l dilute HNO 3 Wash 2~3 times to remove impurities, and then wash 2~3 times with deionized water to wash away residual HNO 3 , And the resulting AgCl precipitate is dried into granules at 100°C.

[0016] The dried granular silver chloride is placed in a plasma processor. The plasma proc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The silver recovering process from silver containing waste liquid includes adding soluble metal salt to silver containing waste liquid to produce silver containing compound precipitate, drying the silver containing compound precipitate to form grains, and reduction in plasma machine at low temperature and with hydrogen as work gas to convert silver compound into silver simple substance. The said process features low processing temperature, simple procedure, low production cost, short processing time, high production efficiency and no environmental pollution. The said process may be also used in recovering Au, Ni, Co, Pt, Mo and other noble metals.

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 kind of precious metal with very high application value. During 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, methods for recovering silver from silver-containing waste liquid can generally be divided into two categories: electrolysis and chemical methods. The electrolysis method uses silver-contai...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00
Inventor 王红卫蒋耀兴夏永林
Owner SUZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com