C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/45
C02F 1/00 (2006.01) B01D 11/04 (2006.01) C01B 7/07 (2006.01) C01G 33/00 (2006.01) C01G 37/00 (2006.01) C01G 49/06 (2006.01) C22B 34/12 (2006.01) C23G 1/36 (2006.01)
Patent
CA 1073566
ABSTRACT OF THE DISCLOSURE A process for treating an acid waste liquid containing Fe ions which has been used for acid washing of metallic materials or articles, comprising the first stage where an organic solvent (A) is added to the acid waste liquid to extract Fe ions, the second stage where an acid is added to the resulting acid waste liquid to convert chemical species of remaining metal salts and increase the hydrogen ion concentration followed by addition of an organic solvent (B) to recover the mineral acid of concern by extraction, the third stage where an organic solvent (C) is added to the resulting acid waste liquid to extract and recover other required mineral acids, and regener- ating each of the organic solvents (A), (B) and (C) in respective stages.
247168
Nishimura Sanji
Watanabe Morio
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