C - Chemistry – Metallurgy – 23 – G
Patent
C - Chemistry, Metallurgy
23
G
149/21
C23G 1/36 (2006.01) C01F 11/46 (2006.01) C01G 49/00 (2006.01) C01G 53/00 (2006.01)
Patent
CA 1237644
Abstract of the Disclosure A process for treating and recovering pickling waste liquids used for the pickling of stainless steel such as nitric-hydrofluoric acid, nitric acid, hydro- chloric acid and, sulfuric acid is disclosed, which comprises recovering the nitric-hydrofluoric acid and the iron oxide or metallic ion from the waste liquids of nitric-hydrofluoric acid and nitric acid by two solvent extraction processes and recovering the Cr and Ni containing ferrite from the waste liquids of sulfuric acid or hydrochloric acid by a ferrite formation process. When the waste acid is sulfuric acid, gypsum of a high purity can be obtained.
477472
Hoshino Minoru
Ishihara Noboru
Nakazato Yoshio
Uchino Kazuhiro
Watanabe Toshio
Kawasaki Steel Corporation
Smart & Biggar
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