Process for treating and recovering pickling waste liquids for s

Details Process for treating and recovering pickling waste liquids for s Process for treating and recovering pickling waste liquids for s

1985-03-20

1986-01-21

Garvin, Patrick P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423151, 423166, 423390, 423483, 423488, 423522, 423555, 423632, 423DIG1, 423DIG2, C01G 4902, C01G 5304, C01G 3702

Patent

active

045656754

ABSTRACT:
A process for treating and recovering pickling waste liquids used for the pickling of stainless steel such as nitric-hydrofluoric acid, nitric acid, hydrochloric 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.

REFERENCES:
patent: 3927173 (1975-12-01), Melzer
patent: 4166098 (1979-08-01), Watanabe et al.

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