Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Radioactive metal
Patent
1981-03-23
1983-12-27
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Radioactive metal
423 17, 423 55, 423 58, 423 65, C01G 5600, C01G 3100, C01G 3900
Patent
active
044230095
ABSTRACT:
Process for the purification of an aqueous solution containing alkali metal carbonate, sulphate, and hydroxide or hydrogen carbonate and primarily one at least of the metals belonging to the group formed by vanadium, uranium and molybdenum, in the form of alkali metal salts, and mineral and/or organic impurities, said solutions resulting from an ore attack cycle and being taken off after extraction of the metal being sought, which comprises treating said solutions by means of lime at a temperature which is at most equal to the boiling temperature, to convert the carbonate and hydrogen carbonate present into alkali metal hydroxide, then effecting separation and washing of a first precipitate of calcium carbonate and a liquor which is enriched in respect of alkali metal hydroxide, concentrating it by evaporation to cause production of a second precipitate which essentially comprises alkali metal sulphate, separating it from the hydroxide-rich liquid phase, re-dissolving it in an aqueous medium and treating the resulting alkali metal sulphate solution by means of barium aluminate and then carbon dioxide, and separating the resulting precipitate which is subjected to a heat treatment to regenerate the barium aluminate which is recycled.
REFERENCES:
patent: 2949339 (1960-08-01), Maruin
patent: 3151932 (1964-10-01), Reussir et al.
patent: 4321235 (1982-03-01), Monret et al.
Maurel Pierre
Nicolas Francois
Aluminium Pechiney
Carter Herbert T.
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