Reductants for reducing metals in acid media

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

1980-05-07

1983-02-22

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 8, 423 20, 423 211, 423 53, 423 62, 423138, 423321R, C01G 4300

Patent

active

043748058

ABSTRACT:
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 are 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 extractant which is selective for tetravalent uranium such as a mixture of mono- and di-(alkylphenyl) esters of orthophosphoric acid.

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Baes, "J. Phys. Chem.", 60, 805-806, (1956).
Bailar et al, "Comprehensive Inorganic Chemistry", I, pp. 1328, 1337-1338 & 1360, Pergamon Press, (1973) Oxford.
Hawley, "The Condensed Chemical Dictionary", 8th Ed., pp. 386 & 784, Van Nostrand Reinhold Company, (1971), New York.

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