Electrolytic filter for electrolytically filtering and recovering metals from colloidal suspensions

摘要

An electrolytic filter, consisting of perforated conductive electrodes isolated by a separator, is adapted to filter at the first electrode or cathode suspended materials, including colloidal metal particles such a silver or gold made colloidal by borohydride, zinc, iron, etc., reduction or sulfide, etc., precipitation of metallic ion- containing solutions. The method of recovery involves use of the electrolytic filter and a composition including the finely divided metal containing waste solution in combination with floc forming compounds such as alkaline earth metal hydroxide, and negative charge imparting additives such as soluble phosphates and anionic resin flocculating agents. Preferably, the filter includes a floc circulating chamber in which the incoming liquid assumes a vertical toroidal flow pattern.