Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1981-01-19
1982-01-19
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 53, 423 54, 423 61, C01G 4100
Patent
active
043116795
ABSTRACT:
Basic sodium tungstate leach liquor is treated to reduce the concentration dissolved therein of silica, phosphorus and fluorine impurities in a process which comprises providing a small but effective amount of magnesium in the liquor to maximize removal of silica and phosphorus from solution in the liquor while maintaining the liquor temperature between about 60.degree. C. and about 100.degree. C. and the liquor pH between about 9 and about 11, filtering the liquor, adjusting the liquor pH to between about 6 and about 8 and the liquor temperature to between about 20.degree. C. and about 60.degree. C., and then providing a small but effective amount of aluminum hydroxide in the filtered liquor to maximize removal of fluorine from solution in the liquor while maintaining the liquor temperature between about 20.degree. C. and about 60.degree. C. and the liquor pH between about 6 and about 8.
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Beckstead Leo W.
Huggins Dale K.
Queneau Paul B.
Amax Inc.
Black Donald T.
Carter Herbert T.
Ciomek Michael A.
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