# 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)
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.