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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

  • Tungsten
  • Ores(Metal sources)
  • Refining(Metallurgy)
  • Electrochemistry
  • Electrolysis
  • Electrolytes
  • Carbides
  • Wolframite
  • Electrowinning
  • Extractive metallurgy
  • Molten salt electrolytes
  • 71J - Iron & Iron Alloys
  • 94G - Manufacturing Processes & Materials Handling
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