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008170809s1968    onc     ob   f000 0 eng d
040 |aCaOODSP|beng
041 |aeng|bfre
043 |an-cn---
0861 |aM34-20/103E-PDF|zM34-20/103
1001 |aVezina, J. A.
24510|aImprovement of a continuous process for the production of tungstic trioxide from scheelite |h[electronic resource] : |bprecipitation and removal of iron with ammonium and magnesium chlorides / |cJ.A. Vezina and W.A. Gow, Extraction Metallurgy Division.
260 |aOttawa : |bQueen's Printer, |c1968.
300 |aiv, 13 p.
4901 |aTechnical bulletin ; |vTB 103
500 |aCover title.
500 |a"November 1968."
500 |aDigitized edition from print [produced by Natural Resources Canada].
504 |aIncludes bibliographical references.
5203 |a“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.
546 |aIncludes abstract in French.
69207|2gccst|aChemicals
69207|2gccst|aProcessing
7001 |aGow, W. A.
7101 |aCanada. |bNatural Resources Canada.
7101 |aCanada. |bMines Branch.
830#0|aTechnical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch)|vTB 103|w(CaOODSP)9.834857
85640|qPDF|s1.57 MB|uhttps://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-103-eng.pdf