NIOSHTIC-2 Publications Search
Recovery of Tungsten from a Hydrothermally Altered Deposit.
Raddatz-AE; Gomes-JM; Sjoberg-JJ; Wong-MM
MISSING :14 pages
The Bureau of Mines is investigating methods for recovering tungsten from domestic resources. A calcine-quench-leach (cql) technique was developed for the extraction of tungsten from the Golconda, Nevada, hot springs ores. The deposit contains disseminated tungsten that cannot be beneficiated by conventional techniques and must be treated by hydrometallurgical methods. The cql procedure consists of calcining the ore at 900 deg c for 3 hours, quenching in a solution containing 1.5 Parts of na2co3 and 1.5 Parts of naoh per part of wo3 in the ore and at a solution-to-ore ratio of 3 to 1, leaching at 200 deg and at 250 psig for 3 hours, and filtering and washing the residue. A series of closed-circuit batch tests showed that 92 pct of the tungsten was extracted from a sample containing 2.32 wt-pct wo3. The pregnant solution contained 11 g/l wo3.
IH; Report of Investigations
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division