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Electrolytic Preparation of Tungsten Metal and Tungsten Carbide from Wolframite.

PB190035

Publication Date	1970
Personal Author	Gomes, J. M.; Uchida, K.; Wong, M. M.
Page Count	12
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 of sodium phosphates, sodium borates, and sodium halides, yielded 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). (Author)
Keywords	Tungsten Ores(Metal sources) Refining(Metallurgy) Electrochemistry Electrolysis Electrolytes Carbides Wolframite Electrowinning Extractive metallurgy Molten salt electrolytes
NTIS Subject Category	71J - Iron & Iron Alloys 94G - Manufacturing Processes & Materials Handling
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Report of investigations.
NTIS Issue Number	197009

Electrolytic Preparation of Tungsten Metal and Tungsten Carbide from Wolframite.

Electrolytic Preparation of Tungsten Metal and Tungsten Carbide from Wolframite.
PB190035

Publication Date	1970
Personal Author	Gomes, J. M.; Uchida, K.; Wong, M. M.
Page Count	12
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 of sodium phosphates, sodium borates, and sodium halides, yielded 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). (Author)
Keywords	Tungsten Ores(Metal sources) Refining(Metallurgy) Electrochemistry Electrolysis Electrolytes Carbides Wolframite Electrowinning Extractive metallurgy Molten salt electrolytes
NTIS Subject Category	71J - Iron & Iron Alloys 94G - Manufacturing Processes & Materials Handling
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Report of investigations.
NTIS Issue Number	197009