Treatment of impurities in silver electrolyte
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Treatment of impurities in silver electrolyte: In the later stages of electrolysis, impurities such as Cu (50–60 g/l), Sb, Pb (0.3%), and Te gradually accumulate in the silver electrolyte, which affects the quality of electroplated silver powder as well as that of silver ingots. I would like to ask those with experience: what methods do you usually use to deal with this issue without having to replace the silver electrolyte?
How about using their properties to dissolve accumulated sulfur precipitates?
Sulfidation precipitation still causes silver to settle at the bottom of the tank; it’s faster to use iron or copper for displacement instead. Do any of my colleagues have any other good methods? Please explain in detail
By settling the silver at the bottom of the tank for melting and impurity removal, significant losses of silver will occur. . .
Dear experts in precious metals: I would appreciate your advice. When the silver electrolyte contains 50 g/l of copper, the silver powder obtained through electrolysis, when cast into silver ingots, will certainly have an excessive copper content. What are some effective ways to remove copper ions from the electrolyte? ?
First, antimony and bismuth are hydrolyzed and filtered; the filtrate is then treated with sulfuric acid to precipitate lead, which is subsequently filtered. The filtrate is used to displace crude silver powder with copper sheets in order to recover pure silver, followed by filtration. Sodium carbonate is added to the filtrate to hydrolyze basic copper carbonate, and flocculants are used to deposit and recover copper. Acid is added to adjust the pH, allowing the waste liquid to be discharged; this can generate additional profits!
I only know how to remove lead using sulfuric acid; there is no filtration, and the solution is directly returned to the electrolyzer
Why doesn’t anyone have any better ideas? ? Gentlemen, please help me. .
Copper electrolysis could be considered first; copper should be easy to electrolyze. Copper can be electrolyzed to very low concentrations, and then silver can be electrolyzed
Using DEX-CU copper-removing resin, the copper content can be reduced to ppm levels without affecting the quality of the electrolyte. sepdex@sina.com