A method for separating silver and copper in silver electrolytic waste liquid

Abstract

The invention belongs to the field of metal smelting, and specifically relates to a method for separating silver and copper in silver electrolysis waste liquid. First, the silver electrolysis waste liquid is concentrated and crystallized, filtered, and then copper powder is added to the obtained filtrate for replacement, and the filtrate obtained after filtering again is It is the waste liquid after silver recovery. Using the above scheme, first concentrate the silver electrolysis waste liquid, because the solubility of silver nitrate is relatively small, and because of the high ion content in the waste liquid, silver nitrate crystallizes out after concentration, and silver nitrate crystals are obtained by filtration; then use silver and copper According to the difference in the activity of the two metals, copper powder is used to replace the silver slag, thereby realizing the recovery of silver, that is, the separation of silver and copper. The scheme of the present invention is simple and efficient, and the silver recovery rate can be as high as over 99%.

Description

A kind of method for separating silver and copper in silver electrolysis waste liquid technical field The invention belongs to the metal smelting field, be specifically related to a kind of method of silver-copper separation in silver electrolysis waste liquid. Background technique [0002] The anode crude silver obtained by pyro-smelting is generally purified by electrolytic refining. Mass fraction of silver in anode silver Generally above 97%, the type and content of impurity elements vary with different smelting raw materials and processes. in electrolysis During the refining process, the impurity elements such as copper, lead, bismuth, and antimony in the anode silver are dissolved in the anode and enter the electrolyte. The position is negative than that of silver, so it is easy to be enriched in the electrolyte. When the concentration of impurity ions is high, not only the current efficiency of cathode silver deposition is Significant decline, and the quality o...

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Problems solved by technology

[0004] For example, Liu Facun, Ma Yutian, Zhang Yan, et al. Study on the process of extracting 1# silver from silver electrolysis waste liquid by using swirl electrolysis technology [J]. Precious Metals, 2013 (s1). It is recorded in an article that using swirl electrolysis technology can Effectively recover silver with higher purity from silver electrolysis waste liquid, and the recovery efficiency of silver is better, but the efficiency of this technical scheme is low, and swirling flow electrolysis is difficult to apply to industrial production; another example is the new process of comprehensive recycling of silver electrolysis waste liquid [J]. World Nonferrous Metals, 2013 (11). This scheme uses sodium hydroxide to precipitate metal ions in electrolytic waste liquid to obtain silver oxide, and returns to neutralize electrolytic waste liquid to hydrolyze and precipitate impurity ions

This scheme can theoretically remove lead, antimony, bismuth, copper and other elements, but the hydrolysis acidity of copper and silver is close, and the reactivity of silver oxide powder is low, so the high silver content in the precipitate requires further silver recovery

[0005] Another example is Chinese patent "silver electrolytic waste liquid treatment method" (authorization publication number is CN102010036B), Chinese patent "a kind of method for reclaiming silver from silver-containing aqueous solution" (application publication number is CN108374095A) and other patent documents, most of which are The recovery of silver is achieved through special electrolysis and electrodeposition, but in fact the recovery efficiency is low, and it does not solve the problem of frequent liquid production

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