Report of Investigations 7344: Electrolytic Preparation of Tungsten Metal and Tungsten Carbide from Wolframite

Details

• Personal Author:
  Gomes, John M. ; Uchida, Kenji ; Wong, Morton M.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  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). [Description provided by NIOSH]
• Subjects:
  Metals Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RERC - Reno Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  12 pdf pages
• NIOSHTIC Number:
  nn:10008928
• NTIS Accession Number:
  PB-190035
• Citation:
  NTIS: PB 190 035 :8 pages
• Federal Fiscal Year:
  1970
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB 190 035
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9467458bbed56316d7241f775a725ed14e10e95e0874b6d715fdceda84afb4387c7ede64a220134ed8d8cdb6daad73c928634633fbc2118fce06218c483e5fd2
• Download URL:
  https://stacks.cdc.gov/view/cdc/201935/cdc_201935_DS1.pdf
• File Type:
  [PDF - 5.39 MB ]