Improvement of a continuous process for the production of tungstic trioxide from scheelite: M34-20/103E-PDF

precipitation and removal of iron with ammonium and magnesium chlorides /

“Test work was carried out to remove iron and other impurities from a sodium tungstate solution. This constituted an improvement to the process previously developed at the Mines Branch for refining Canadian scheelite concentrates of grades as low as 41 per cent WO3. In this test work, by making the intermediate sodium tungstate solution ammoniacal and adding specific quantities of magnesium chloride and ammonium chloride, the iron concentration was decreased from 0.33 to 0.007 gram Fe per litre. When the basic process was modified to include this iron-removal step, it was capable of producing ammonium paratungstate of a chemical purity suitable for the production of tungsten metal. The additional cost involved in the precipitation of the iron from the process circuit was $0.023 per pound of tungsten obtained"--Abstract, p. i.

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Department/Agency Natural Resources Canada. Mines Branch.
Title Improvement of a continuous process for the production of tungstic trioxide from scheelite
Subtitle precipitation and removal of iron with ammonium and magnesium chlorides /
Series Title Technical bulletin ;
Publication Type Series - View Master Record
Language [English]
Format Electronic
Electronic Document

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Note Cover title. "November 1968." Digitized edition from print [produced by Natural Resources Canada].
Date 1968.
Number of Pages iv, 13 p.
Catalogue Number
  • M34-20/103E-PDF
Departmental Catalogue Number 299989
Subject Terms Chemicals, Processing