| 摘要 |
<p>PURPOSE:To reutilize a precipitate as a copper refining stock material and a filtrate as a copper electrolyte by a method wherein an elecrolyte subjected to copper electrolytic refining is subjected to copper removing treatment and, after warmed to a specific temp. or more, hydrogen sulfide is blown until a predetermined electric potential is reached to precipitate a metal component as a sulfide. CONSTITUTION:An electrolyte which is subjected to copper removing treatment by copper removing electrolytic treatment or the like and to copper electrolytic refining is introduced into a reaction tank and warmed to a temp. of 40 deg.C or more. Subsequently, hydrogen sulfide is blown until predetermined electric potential, especially, about 280mV is attained by a platinum electrode to precipitate most of a metal such as Cu, Bi, As, Ag or the like in the liquid. The resulting precipitate is filtered and the precipitate is recirculated as a copper refining stock material and the filtrate as a copper electrolyte.</p> |
