Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1981-03-09
1982-03-02
Hearn, Brian E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
423140, 423150, 423DIG14, 210634, 210638, 210639, 210912, C01G 4902
Patent
active
043178049
ABSTRACT:
A process for treating an aqueous acidic solution containing a large amount of ferric ion and other metal ions such as a hydrochloric acid solution of manganese nodules, which includes contacting the aqueous solution with an organic extractant to selectively extract the ferric ion therefrom. The extractant is comprised of a dialkylphosphoric acid having 6-12 carbon atoms and a hydrocarbon solvent such as kerosene. The aqueous phase obtained after the extraction is then added with a pH-controlling agent to increase the pH thereof to a value so that unextracted ferric ion remaining therein may precipitate as ferric hydroxide while the other metal ions may be prevented from precipitating. Solid-liquid separation of the resulting mixture gives a solution having a ferric ion concentration of about 0.1 g/l or less. The pH-controlling agent is preferably an industrial waste containing a metal oxide or hydroxide such as a sludge from plating industries. By repeating the above procedure, a substantially ferric ion-free solution may be obtained.
REFERENCES:
patent: 3586477 (1971-06-01), Flood
patent: 3876748 (1975-04-01), Roorda
patent: 3966569 (1976-06-01), Reinhardt
patent: 4029733 (1977-06-01), Faugeras
Fletcher et al., in Bulletin of the Institution of Mining and Metallury, No. 693, Aug. 1964, pp. 765-777.
Director--General of Agency of Industrial Science and Technology
Hearn Brian E.
Yee Stephen F. K.
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