Reductants for reducing metals in acid media

Details Reductants for reducing metals in acid media Reductants for reducing metals in acid media

C - Chemistry, Metallurgy

21

B

53/33, 23/76

C21B 15/00 (2006.01) C22B 60/02 (2006.01)

Patent

CA 1132350

ABSTRACT OF THE DISCLOSURE Metals such as iron, uranium, vanadium, molybdenum and rare earths are reduced to lower oxidation states in various acid media using silicon metal or an iron-silicon alloy. In particular, ferric iron and hexavalent uranium in wet-process phosphoric acid arc reduced to the ferrous and tetravalent states, respectively, using silicon metal or an iron-silicon alloy to provide a feed acid which is suitable for extraction with an extrac- tant which is selective for tetravalent uranium such as a mixture of mono- and di-(alkylphenyl) esters of ortbophosphoric acid.

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