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Silver stripping agent for silver-containing copper-based waste materials and silver stripping technology

A technology for removing silver and scrap, applied in the field of alloy processing, can solve the problems of limitations in popularization and application, inappropriate use, application limitations, etc., and achieves the effects of short process flow, simple equipment and easy operation.

Inactive Publication Date: 2019-02-12
光洋新材料科技(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the cyanide produced by the cyanidation method has a series of problems such as high toxicity and environmental pollution, the application of the method is greatly restricted; the nitric acid dissolution method dissolves copper and silver into the solution, and copper cannot be effectively utilized. Therefore this method is also limited; the electrolytic method is troublesome due to the process itself and equipment problems, and its popularization and application is also limited; the molten lead desilvering method is to use lead as a silver collector to form a lead-silver alloy, and finally use the ash blowing method Separation of lead and silver
A large amount of toxic vapors are produced during the ash blowing process, and it is generally not suitable to use

Method used

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  • Silver stripping agent for silver-containing copper-based waste materials and silver stripping technology
  • Silver stripping agent for silver-containing copper-based waste materials and silver stripping technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0026] The treatment object is copper-based silver plating waste, the volume ratio of acid is concentrated sulfuric acid:concentrated nitric acid=19:1~3, the temperature is 20~50°C, and the silver stripping time is 5~10min.

[0027] Because the silver is located on the surface, it is easier to remove silver, so the formula of the silver remover is mainly concentrated sulfuric acid, the temperature requirement is low, and the silver removal time is relatively short.

Embodiment 4～6

[0029] The treatment object is copper-based silver-containing contacts, the volume ratio of acid is concentrated sulfuric acid:concentrated nitric acid=4:1~1.5, the temperature is 110~150°C, and the silver stripping time is 120min.

[0030] Because the silver will be located inside the object, it is more difficult to return the silver, so the proportion of concentrated nitric acid in the formula of the silver removal agent is relatively large, the temperature requirement is high, and the silver removal time is relatively long.

[0031] Parameter conditions and the silver return effect of each embodiment are as shown in table 1:

[0032] Table 1:

[0033]

[0034]

[0035] It can be seen from Table 1 that the silver element in the silver-containing copper-based waste can be extracted efficiently by using the silver stripping agent and the silver stripping process, the process is simple, and the extraction rate of silver is very high; the reaction will not emit a large amo...

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Abstract

The invention belongs to the technical field of alloy machining, and particularly relates to a silver stripping agent for silver-containing copper-based waste materials and a silver stripping technology. The silver stripping agent comprises concentrated sulfuric acid and concentrated nitric acid, and the volume ratio of the concentrated sulfuric acid to the concentrated nitric acid is 19:(1-3) or4:(1-1.5). The silver stripping technology comprises the steps that the concentrated sulfuric acid and the concentrated nitric acid are mixed in proportion; the silver-containing copper-based waste materials are put into silver stripping liquid for 5-120 min; after silver layers are completely dissolved out, the waste materials are taken out and washed; and new waste materials are put into the silver stripping liquid for silver stripping, and when silver sulfate in the silver stripping liquid is saturated, silver stripping is stopped. According to the silver stripping agent for the silver-containing copper-based waste materials and the silver stripping technology, the technological process is short, equipment is simple, operation is easy, little pollution is generated, acid can be cyclically used, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of alloy processing, and in particular relates to a silver-removing agent and a silver-removing process for copper-based waste containing silver. Background technique [0002] At present, all countries in the world regard precious metal renewable resources as equally important resources as mineral resources. Compared with refining from ore, recovery of precious metals from waste has the advantages of high grade, simple components, less investment, low cost, and good benefits. [0003] Silver is the most widely used metal among precious metals. During the production and use of silver-containing products, a large amount of waste will be generated. There are many types of silver-containing waste, and there are dozens of types of copper-based silver-plated waste and copper-based silver-containing waste contacts, and the silver content in these wastes varies greatly. [0004] There are many current silver remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCC22B7/007C22B11/042C22B15/0071C22B15/0073Y02P10/20
Inventor 高毅黄军浩陈茂军
Owner 光洋新材料科技(昆山)有限公司