HYDROMETALLURGISKT FOERFARANDE FOER TILLVARATAGANDE AV SILVER UR ANODSLAMMET AV KOPPARELEKTROLYS OCH UR ANDRA MOTSVARANDE RAOMATERIAL.

摘要

Silver is recovered from an anode sludge by initially chlorinating the sludge in a slurry with nascent chlorine. The nascent chlorine is produced in situ by addition of sodium hypochlorite to the slurry in hydrochloric acid. Then the slurry is filtered and the silver containing solid phase extracted with ammonia to produce a solution from which lead is precipitated. The filtrate is then reacted with copper to precipitate silver.