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Method for separating silver and copper in silver electrolysis waste liquid

A technology for electrolytic waste liquid and silver-copper, applied in chemical instruments and methods, copper sulfate, silver compounds, etc., can solve the problems of frequent liquid production, low reactivity of silver oxide powder, and high silver content, so as to reduce the frequency of liquid production and The amount of liquid production, the reduction of yellow smoke, and the excellent recovery effect

Active Publication Date: 2020-05-05
JINLONG COPPER +2
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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 l

Method used

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  • Method for separating silver and copper in silver electrolysis waste liquid
  • Method for separating silver and copper in silver electrolysis waste liquid
  • Method for separating silver and copper in silver electrolysis waste liquid

Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] 1. Preparation and detection of silver nitrate crystals and concentrated mother liquor:

[0028] The silver electrolysis waste liquid is placed in a closed heating container for vacuum distillation and concentration, then heating is stopped (75-80° C.), after natural cooling, silver nitrate crystals and concentrated mother liquor are obtained, and the distillation product is collected and condensed to obtain a distillate, The specific preparation parameters and detection parameters are shown in Table 1.

[0029] Table 1 vacuum distillation, filtration step specific process parameters and detection results.

[0030]

[0031] As can be clearly seen from the above table, in the process of preparing silver nitrate crystals and concentrated mother liquor, the optimal volume ratio of silver electrolytic waste liquid and obtained concentrated mother liquor after vacuum distillation is 5:1 (i.e., the concentration ratio is 5 times).

[0032] 2. Preparati...

Example Embodiment

[0043] Example 2

[0044] Adopt the same method as Example 1 to separate silver and copper in the silver electrolysis waste liquid, wherein, the relative vacuum degree is controlled at -0.06MPa, the concentration ratio of vacuum distillation is 5 times, and after heating is stopped, it is cooled to room temperature and filtered to obtain a crystalline product And concentrated mother liquor mother liquor, then replace according to the content of 0.7g copper powder added per liter of concentrated mother liquor, filter to obtain silver slag and replacement mother liquor after reaction for 30min, then add concentrated sulfuric acid in the amount of 700mL of concentrated sulfuric acid added to each liter of replacement mother liquor, After stirring and cooling to room temperature, filter to obtain copper sulfate filter residue and copper precipitation waste liquid. Repeated the test for many times, the test results showed that the silver ion concentration in the replacement mother ...

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Abstract

The invention belongs to the field of metal smelting, and particularly relates to a method for separating silver and copper in silver electrolysis waste liquid, which comprises the following steps: concentrating, crystallizing and filtering the silver electrolysis waste liquid, adding copper powder into the obtained filtrate for replacement, and filtering again to obtain filtrate, namely silver-recovered waste liquid. By the adoption of the scheme, the silver electrolysis waste liquid is concentrated firstly, due to the fact that the solubility of silver nitrate is relatively low and the ion content in the waste liquid is high, silver nitrate crystals are separated out after concentration and filtered, and silver nitrate crystals are obtained; and then silver slag is replaced with copper powder by utilizing the activity difference of silver and copper, so that silver recovery is realized, namely, silver and copper separation is realized. The scheme is simple and efficient, and the silver recovery rate can reach 99% or above.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a method for separating silver and copper from silver electrolysis waste liquid. Background technique [0002] The anode crude silver obtained by fire smelting is generally purified by electrolytic refining. The mass fraction of silver in anode silver is generally above 97%, and the types and contents of impurity elements vary with different smelting raw materials and processes. During the electrolytic refining process, impurity elements such as copper, lead, bismuth and antimony in the anode silver are anodically dissolved and enter the electrolyte. Since its potential is negative than silver, it is easy to be enriched in the electrolyte. When the concentration of impurity ions is relatively high When it is high, not only the current efficiency of cathode silver deposition is significantly reduced, but also the quality of cathode silver is difficult to meet the standar...

Claims

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Application Information

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IPC IPC(8): C01G5/00C01G3/10
CPCC01G5/00C01G3/10Y02P10/20
Inventor 文燕郑国渠黄辉荣李春侠曹华珍王海荣甘秀江张惠斌崔平汪永红
Owner JINLONG COPPER
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