OBTAINING OF SILVER FROM SATURATED SILVER ELECTROLYTE

摘要

In the silver electrolytical refining process, acid silver nitrate solution is used as electrolyte. If copper content in electrolyte is over limit concentration, it is necessary to carry out the electrolyte regeneration. The scope of work was an investigation of the most efficient method for regeneration of silver electrolyte, that is silver and copper separation from saturated silver electrolyte. Upon detailed investigations in laboratory conditions in Copper Institute Bor and industrial conditions in the Anode Slime Treatment Plant in Bor, a method of selective silver deposition was developed from saturated silver electrolyte by the use of sodium sulphite and its complete separation from present copper ions in electrolyte. The advantages of selected method are: recovery of silver in powder in one-stage of reaction, high degree of reagent selectivity, high deposition degree of silver, obtained silver in powder is of commercial quality.