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

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

研究成果: Article査読

9 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)211-215
ページ数5
ジャーナルInternational Journal of Refractory Metals and Hard Materials
58
DOI
出版ステータスPublished - 2016 8月 1

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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