Thermodynamics of Tungsten Ores Decomposition Process Options

Leiting Shen, Xiaobin Li, Pekka Taskinen

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

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Abstract

The thermodynamics of tungsten ore decomposition in mineral acid and alkaline solutions were studied. The published thermodynamic data of tungsten minerals were collected and assessed. The Gibbs energies of CaWO4 (−1538.43 kJ/mol), FeWO4 (−1053.91 kJ/mol), MnWO4 (−1206.08 kJ/mol), H2WO4 (−1003.92 kJ/mol), and Na2WO4 (−1455.58 kJ/mol, aq) at 25 °C were adopted in the calculation using HSC software. The results show that CaWO4 is decomposed more readily in Na2CO3 solution than in NaOH, while FeWO4 and MnWO4 are more reactive in NaOH solutions. From a thermodynamic point of view, tungsten ore decomposes easily in acid solutions despite most ΔG o T ΔGTo increasing slightly with temperature. Oxidizing Fe2+ to Fe3+ in acidic solutions facilitates decomposition of FeWO4, and the reaction of CaWO4 in H2SO4 solution occurs more easily than in other mineral acids, due to the formation of sparsely soluble CaSO4. The results fit well with the experimental data and industrial experience previously reported in the literature.
Original languageEnglish
Title of host publicationExtraction 2018
Subtitle of host publicationProceedings of the First Global Conference on Extractive Metallurgy
EditorsBoyd Davis, M Moats, S Wang
Pages2441-2453
Number of pages13
ISBN (Electronic)978-3-319-95022-8
DOIs
Publication statusPublished - 2018
MoE publication typeA3 Part of a book or another research book
EventGlobal Conference on Extractive Metallurgy - Ottawa, Canada
Duration: 26 Aug 201829 Aug 2018
Conference number: 1
http://www.extractionmeeting.org/Extraction/Home/Extraction/Default.aspx?hkey=7b5c7a17-4f49-4312-a245-8178042aab43

Publication series

NameThe Minerals, Metals & Materials Series
PublisherThe Minerals, Metals & Materials Society
ISSN (Electronic)2367-1696

Conference

ConferenceGlobal Conference on Extractive Metallurgy
CountryCanada
CityOttawa
Period26/08/201829/08/2018
Internet address

Keywords

  • Scheelite
  • Wolframite
  • Mineral acid
  • Alkaline media
  • Gibbs energy

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