C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/65, 204/80
C25B 1/22 (2006.01) C01B 7/01 (2006.01) C01B 17/90 (2006.01) C01G 49/00 (2006.01) C01G 49/06 (2006.01) C23G 1/36 (2006.01) C25C 1/06 (2006.01) C25F 7/02 (2006.01) C01B 7/00 (2006.01)
Patent
CA 1123373
ABSTRACT OF THE DISCLOSURE This invention relates to a process for recovery of waste H2S04 and HCl which are used for pickling metallic materials and articles and contain large quantities of Fe ions. Furthermore, it offers a process for recovery of H2S04 and HCl from waste H2S04 which contains large amounts of Fe ions after removal of Ti ions by hydrolysis process in the production of Ti02 and also high-purity electrolytic iron or iron hydroxide. In an oxidation reduction cell, Fe2+ ions in the waste, the waste constituting the anolyte, are converted to Fe3+ ions which are extracted from the anolyte with an organic solvent to recover HCl and H2S04. The solvent is then stripped with an HCl stripping solution to be regenerated, leaving an HCl stripping solution containing Fe3+ ions. The Fe3+ ions are then recovered by liquid-liquid extraction with another organic solvent to form an FeC13 complex. The second solvent is then regenerated, iron values are recovered and the HCl strip solu- tion is also regenerated.
273290
Nishimura Sanji
Watanabe Morio
Solex Research Corporation Of Japan
Swabey Ogilvy Renault
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