Report of Investigations 9165: Preparation of Ammonium Paratungstate from a Sodium Tungstate-Sodium Chloride Phase

Details

• Journal Article:
  MISSING
• Personal Author:
  Carnahan, Thomas G. ; Gomes, John M. ; Raddatz, Andrea E.
• Description:
  Previous Bureau of Mines research has shown that tungsten ores containing as little as 40 pct (wo3)2- can be processed by a high- temperature molten-salt extraction technique to produce a tungstate- bearing sodium chloride phase with 99 pct w recovery and little impurity contamination. The objective of this work was to demonstrate that the tungstate-bearing sodium chloride phase can be a suitable feed material for preparing ammonium paratungstate (apt) by a modification to the present industrial solvent extraction process. A combined crossflow-countercurrent flow solvent extraction technique to extract tungsten is presented. Apt produced by this new technique contained 88.6 pct (wo3)2- and the following impurities, in percent: mNO2, 0.0007; Moo2, 0.017; P2o5, <0.010; and sio2, 0.012. Implementation of this processing technique would improve tungsten recovery from concentrates and simplify processing operations. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Source:
  MISSING :10 pages
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  United States
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RERC - Reno Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  15 pdf pages
• NIOSHTIC Number:
  nn:10006039
• Federal Fiscal Year:
  1988
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:00c02c89b3289541db1e7b62f90c3f505f4a529876696bd2d8b07964b3c916ddfe5f5050c6232972ef7f8a08f23edc4d660f7ecfdf4e1900adfa38290da48e92
• Download URL:
  https://stacks.cdc.gov/view/cdc/10634/cdc_10634_DS1.pdf
• File Type:
  [PDF - 643.66 KB ]