Extraction of tungsten component from the scheelite concentrate by the chlorination

회중석 정광의 염소화에 의한 텅스텐 성분의 추출

  • Um, Myeong-Heon (Dept. of Ind. Chem., Cheon An Nat'l Junior Tech. College) ;
  • Lee, Chul-Tae (Dept. of Chem. Eng., College of Eng., Dankook Univ.)
  • 엄명헌 (천안공업전문대학 공업화학과) ;
  • 이철태 (단국대학교 공과대학 화학공학과)
  • Received : 1992.08.29
  • Accepted : 1992.12.28
  • Published : 1993.03.01

Abstract

To extract the tungsten component from the scheelite by the chlorination process, effects of major variables such as the reducing agent, reaction temperature, reaction time, flow rate of the $Cl_2$ gas, and the particle size of the sample, were examined in the batch-boat system. The optimum conditions for this chlorination process were as follows ; reaction temperature above $700^{\circ}C$, carbon weight ratio to the scheelite 0.08, reaction time 20 min, flow rate of the $Cl_2$ gas $0.6{\ell}/min$, particle size of scheelite ore -200 mesh. Under the above conditions, 99% of tungsten component was extracted from scheelite ore. The diffusion step and chemical reaction step were the rate-determining steps at high and low temperature, respectively. Activation energy was 7.98kcal/mol at high temperature region and 31.2kcal/mol at low temperature one.

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