EXTRACTION WITH SOLVENT OF IMPURITIES FROM DISCUSSIONS CONCENTRATED OF METAL SULFATES.

摘要

Method for removing metallic impurities from a valuable impure concentrated stream of metal sulfates in a solvent extraction circuit, which method involves contacting the impure valuable concentrated stream of metal sulfates with a cationic solvent extraction agent in the extraction circuit with solvent operating at a relatively high temperature, greater than 60 ° C, which is effective for increasing the solubility of the valuable metal in the concentrated sulfate stream containing ammonium sulfate, said extraction circuit being also operated so that one or more of The metal impurities are loaded into the cationic solvent extraction agent that uses ammonia to control the pH, while a refining of the solvent extraction circuit, which contains the valuable metal, is enriched in ammonium sulfate.