Process for the recovery of zinc and production of hematite...

Details Process for the recovery of zinc and production of hematite... Process for the recovery of zinc and production of hematite...

C - Chemistry, Metallurgy

22

B

53/328

C22B 19/30 (2006.01)

Patent

CA 1212841

- 25 - ABSTRACT OF THE DISCLOSURE: A process for the extraction of zinc from zinc ferrite residues by pressure leaching with sulphuric acid in an autoclave system is disclosed. The process comprises subjecting a slurry of the zinc ferrite residue to pressure leaching at elevated temperature and low acid concentration under slightly reducing initial conditions followed by pressure leaching at elevated temperature under oxidizing conditions, such as to form a precipitate essentially consisting of hematite, and separating such hematite from the resulting zinc containing solution.

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