C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/148
C22B 34/36 (2006.01) C01G 41/00 (2006.01)
Patent
CA 1181240
TREATMENT OF SODIUM TUNGSTATE LEACH LIQUOR CONTAINING DISSOLVED SILICA, PHOSPHORUS, AND FLUORINE IMPURITIES ABSTRACT OF THE DISCLOSURE 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°C and about 100°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°C and about 60°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°C and about 60°C and the liquor pH between about 6 and about 8.
393846
Beckstead Leo W.
Huggins Dale K.
Queneau Paul B.
Amax Inc.
Gowling Lafleur Henderson Llp
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