Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Hydrometallurgical Processes for the Recovery of Tungsten from Ores and Secondary Resources

원광석 및 2차 자원으로부터 텅스텐 습식 제련 기술

  • Ahn, Hyeong Hun (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Lee, Man Seung (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University)
  • 안형훈 (목포대학교 공과대학 신소재공학과) ;
  • 이만승 (목포대학교 공과대학 신소재공학과)
  • Received : 2018.10.01
  • Accepted : 2018.10.26
  • Published : 2018.12.28
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Abstract

Tungsten is a metal with high melting point and used as a raw material for the production of super alloys. Tungsten exists as $WO{_4}^{2-}$ in alkaline solution. As solution pH decreases, polymerization reaction of $WO{_4}^{2-}$ occurs to result in the precipitation of tungstic acid. The hydrometallurgical process for the recovery of tungsten from ores or secondary resources can be classified as acid and alkaline leaching. In selecting a process for the recovery of pure tungsten from secondary resources, the nature and concentration of impurities in the secondary resources and the manufactured tungsten materials should be considered.

텅스텐은 고융점금속으로 주로 초경합금으로 사용되고 있다. 알칼리용액에서 텅스텐은 $WO{_4}^{2-}$로 존재하는데 용액의 pH가 감소함에 따라 중합반응이 일어나며 텅스텐산으로 침전된다. 따라서 원광석 및 2차 자원으로부터 텅스텐 회수를 위한 습식 제련 기술은 산침출과 알칼리침출로 대별된다. 2차 자원에 함유된 금속의 종류와 함유량 및 텅스텐의 소재화를 고려해서 2차 자원으로부터 텅스텐을 고순도로 회수하기 위한 공정을 선택해야 한다.

Keywords

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Fig. 1. Generalized process flow sheet for the production of tungsten.

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Fig. 2. Scheme of the distribution of tungsten ions in aqueous solution.

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Fig. 3. Scheme for conventional recovery process of tungsten from WC-Co scrap by acid leaching.

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Fig. 4. Scheme for conventional recovery process of tungsten from WC-Co scrap by alkaline leaching.

Table 1. Properties of the tungsten minerals

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Table 2. Several processes for the extraction of tungsten from scheelite and wolframite

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