METHOD FOR PROCESSING ZINC SILICATE-CONTAINING ZINC CRUDE MATERIAL

摘要

A method for processing a zinc silicate-containing zinc crude material, characterized by maintaining a sulfuric acid-acidified solution in the following condition s in extracting zinc from a zinc silicate-containing zinc crude material in a sulfuric acid- acidified leaching tank: liquid temperature (t) : t .gtoreq. 75.degree.C pH : 1.5 .ltoreq. pH .ltoreq. 3.0 Si0 2 concentration : Si0 2 .ltoreq. 5.0 g/l wherein said Si0 2 concentratio n is the concentration of ionic silica [Si(OH)4] and of colloidal silica [(Si0 2)n] in said solution.