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Electrolytic Preparation of Tungsten Metal and Tungsten Carbide from Wolframite.

Authors
Gomes-JM; Uchida-J; Wong-MM
Source
NTIS: PB 190 035 :8 pages
Link
NIOSHTIC No.
10008928
Abstract
Two methods for electrowinning tungsten from wolframite [(fe,mn) wo4] were investigated. The first method, direct electrowinning from wolframite concentrate dissolved in molten salt mixtures composed essentially of various combinations of sodium phosphates, sodium borates, and sodium halides, yeilded impure products. The second method was electrowinning from a halide-tungstate melt that was obtained from a high-temperature, two-phase extraction of tungstic oxide (wo3) from wolframite. Electrolysis in electrolytes prepared from addition of sodium metaphosphate (napo3) and boric oxide (b2o3) to the halide-tungstate melt produced tungsten metal of 99.9 percent purity. Tungsten carbide (wc) was electrodeposited from the halide-tungstate melt when the melt was adjusted to contain 82 mole-percent nacl and 6.0 Mole-percent each of wo3, sodium metaborate (na2b2o4), and caustic soda (naoh).
Publication Date
19700101
Document Type
IH; Report of Investigation;
Fiscal Year
1970
NTIS Accession No.
PB-190035
NTIS Price
A02
Identifying No.
RI 7344
NIOSH Division
RERC;
Source Name
NTIS: PB 190 035
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