Process for the purification of solutions containing alkali meta

Details Process for the purification of solutions containing alkali meta Process for the purification of solutions containing alkali meta

1981-03-23

1983-12-27

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 11, 423 58, 423 65, C01G 3900, C01G 5600, C11G 3100

Patent

active

044230133

ABSTRACT:
Process for extracting molybdenum from aqueous solutions containing alkali metal carbonate, sulphate, 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, in the form of a concentrate, wherein said solutions are caustified by the addition of a suitable amount of lime, converting the carbonate present into alkali metal hydroxide, a first precipitate is separated from the alkali metal hydroxide-rich liquor, said liquor is concentrated until the alkali metal hydroxide content is at most equal to 50%, to cause the production of a second precipitate formed by alkali metal sulphate and molybdate, which is solubilized in an aqueous recycle liquor, said re-dissolution liquor then being treated with sulphide ions and then acidified to give a pH-value of lower than 4.5, in order quantitatively to precipitate the molybdenum which is separated from the mother liquor, washed and dried for use as a source of molybdenum.

REFERENCES:
patent: 2949339 (1960-08-01), Marvin
patent: 3151932 (1964-10-01), Reusser et al.
patent: 4321235 (1982-03-01), Mouret et al.

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