PROCESS FOR THE RECOVERY OF ZINC AND PRODUCTION OF HEMATITE FROM ZINC PLANT RESIDUES

摘要

- 25 -ABSTRACT OF THE DISCLOSURE:A process for the extraction of zinc from zincferrite residues by pressure leaching with sulphuricacid in an autoclave system is disclosed. The processcomprises subjecting a slurry of the zinc ferriteresidue to pressure leaching at elevated temperatureand low acid concentration under slightly reducinginitial conditions followed by pressure leaching atelevated temperature under oxidizing conditions, suchas to form a precipitate essentially consisting ofhematite, and separating such hematite from theresulting zinc containing solution.