Production method for separating silver from silver waste liquid
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A production method and technology of waste liquid, applied in the production field of separating silver, achieving the effect of low cost, high efficiency and simple operation
Inactive Publication Date: 2017-08-18
JINCHUAN GROUP LIMITED
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[0008] The purpose of the present invention is to solve the technical problems in the prior art, provide a low-cost, simple operation, high efficiency,
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Embodiment 1
[0019] Such as figure 1 Shown, a kind of production method of separating silver from silver-containing waste liquid, the method may further comprise the steps:
[0020] a) In the silver-containing waste liquid, add ammonia water with a mass concentration of 25% and analytically pure grade, adjust the pH value of the silver-containing waste liquid to 9, and hydrolyze the inert metal ions in the silver-containing waste liquid into hydroxide precipitates, silver The ions generate silver ammonium complex ions, and the hydroxide precipitates of inert metal ions are removed by filtration to obtain silver ammonium solution;
[0021] b) Add excess mass concentration of 80% hydrazine hydrate of analytically pure grade to the silver ammonium solution until no bubbles are produced in the solution, and the silver ions are completely reduced to silver powder;
[0022] c) Separate the supernatant, and wash the silver powder with pure water several times until the pH value of the washing so...
Embodiment 2
[0024] Such as figure 1 Shown, a kind of production method of separating silver from silver-containing waste liquid, the method may further comprise the steps:
[0025] a) In the silver-containing waste liquid, add ammonia water with a mass concentration of 28% and analytically pure grade, adjust the pH value of the silver-containing waste liquid to 10, and hydrolyze the inert metal ions in the silver-containing waste liquid into hydroxide precipitates, silver The ions generate silver ammonium complex ions, and the hydroxide precipitates of inert metal ions are removed by filtration to obtain silver ammonium solution;
[0026] b) Add excess mass concentration of 80% hydrazine hydrate of analytically pure grade to the silver ammonium solution until no bubbles are produced in the solution, and the silver ions are completely reduced to silver powder;
[0027] c) Separate the supernatant, and wash the silver powder with pure water several times until the pH value of the washing s...
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Abstract
The invention discloses a production method for separating silver from silver-containing waste liquid. In the method, firstly, the silver-containing waste liquid is complexed with ammonia water and then filtered, and the hydroxide of inert metal ions is precipitated and removed to obtain silver ammonium solution, and then Use hydrazine hydrate to reduce the silver ammonium solution to obtain silver powder, and finally separate the supernatant, wash the silver powder with pure water several times, filter and dry to obtain silver powder with a purity greater than 98%. The invention only needs a small amount of plastic containers and filter cloth, does not need to invest in complicated equipment, only needs two reagents of ammonia water and hydrazine hydrate, does not need to introduce other base metals, and does not use halides to precipitate silver, and can complete the removal of silver and other metal impurities. Separation, the excess reducing agent added can be removed by washing to obtain higher purity silver powder. The invention has the advantages of low cost, simple operation and high efficiency, and is suitable for recovering and purifying silver in silver-containing waste liquid with a silver concentration greater than 0.1 g/ml, and the separated silver has high purity.
Description
technical field [0001] The invention belongs to the technical field of silver recovery and purification, in particular to a production method for separating silver from silver-containing waste liquid. Background technique [0002] With the development of science and technology, silver has become an indispensable important metal material in modern science and technology and cultural life. However, the natural resources of silver are decreasing day by day, while the waste containing silver is increasing day by day, and its silver grade is higher than that of raw ore, easy to recycle, and economical. At present, the methods for recovering silver from silver-containing waste liquid mainly include precipitation method, electrolysis method, reduction substitution method, ion exchange method and adsorption method. [0003] (1) Precipitation method: The precipitation method to recover silver in silver-containing waste liquid is to add appropriate anions to the silver-containing was...
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