Mechanochemically extracting tungsten through caustic processing of scheelite by controlling calcium dissolution

Min Chen, Zhao Li, Xuewei Li, Jun Qu, Qiwu Zhang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A novel process to extract tungsten from scheelite (CaWO4) was developed by dry grinding with sodium hydroxide (NaOH) and controlling the calcium dissolution based on two methods. One was to wash the ground product composed of sodium tungstate (Na2WO4) and calcium hydroxide (Ca(OH)2) in the solution of sodium salts instead of water. For example, W recovery was increased from 30% in water washing to 96% in a 0.1 M soda (Na2CO3) solution due to the formation of calcium carbonate (CaCO3). Another was to add Al(OH)3 further to the cogrinding of CaWO4 and NaOH to produce Na2WO4 and katoite (Ca3Al2(OH)12). Over 98% W recovery was simply obtained by only water washing the product due to the existence of insoluble Ca3Al2(OH)12. Grinding time and Al(OH)3 dosage were found to be key factors in affecting W recovery.

Original languageEnglish
Pages (from-to)211-215
Number of pages5
JournalInternational Journal of Refractory Metals and Hard Materials
Volume58
DOIs
Publication statusPublished - 2016 Aug 1

Keywords

  • Aluminum hydroxide
  • CaAl(OH)
  • Mechanochemical
  • Scheelite
  • Sodium hydroxide

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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