Recovery of Scheelite and Byproduct Sphalerite from Western U.S. Tactite Ores.
Gomes JM; Raddatz AE; Wong MM
MISSING :9 pages
Bench-scale flotation tests were conducted on two western tactite ores to study the recovery of tungsten and zinc minerals. The investigation, which is part of the Bureau of Mines ongoing program to develop methods for beneficiating minerals and metals from domestic low-grade ores, demonstrated the feasibility of producing scheelite, sphalerite, and their bulk concentrates. Sphalerite concentrates containing 51 to 53 pct zn and less than 0.11 pct wo3 were selectively recovered prior to scheelite flotation. Zinc recovery ranged from 85 to 91 pct. Scheelite concentrates containing 17 to 25 pct wo3 were then recovered from the ore; tungsten recoveries ranged from 88 to 94 pct. Bulk flotation concentrates containing 84 to 91 pct of the wo3 and 87 to 95 pct of the zinc also were prepared. More than 98 pct of the wo3 in a bulk concentrate containing 9 pct wo3 was extracted by autoclave leaching with a soda solution. The zinc remained in the leached residue.
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