Global Fitting Functions for Kinetics of Fe-Selective Chlorination in Ilmenite and Successive Chlorination of Beneficiated TiO<sub>2</sub>

정동규; 원용선; 김용하; 정은진; 송덕용

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자료유형: 학술저널

저자정보: 정동규 (부경대학교 청정생산기술연구소) 원용선 (부경대학교 화학공학과) 김용하 (부경대학교 화학공학과) 정은진 (포항산업과학연구원 금속재료연구그룹) 송덕용 (한국금속재료연구조합)

저널정보: 한국재료학회 한국재료학회지 한국재료학회지 제29권 제7호

발행연도: 2019.1

수록면: 412 - 424 (13page)

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Global fitting functions for Fe-selective chlorination in ilmenite($FeTiO_2$) and successive chlorination of beneficiated $TiO_2$ are proposed and validated based on a comparison with experimental data collected from the literature. The Fe-selective chlorination reaction is expressed by the unreacted shrinking core model, which covers the diffusion-controlling step of chlorinated Fe gas that escapes through porous materials of beneficiated $TiO_2$ formed by Fe-selective chlorination, and the chemical reaction-controlling step of the surface reaction of unreacted solid ilmenite. The fitting function is applied for both chemical controlling steps of the unreacted shrinking core model. The validation shows that our fitting function is quite effective to fit with experimental data by minimum and maximum values of determination coefficients of $R^2$ as low as 0.9698 and 0.9988, respectively, for operating parameters such as temperature, $Cl_2$ pressure, carbon ratio and particle size that change comprehensively. The global fitting functions proposed in this study are expressed simply as exponential functions of chlorination rate(X) vs. time(t), and each of them are validated by a single equation for various reaction conditions. There is therefore a certain practical merit for the optimal process design and performance analysis for field engineers of chlorination reactions of ilmenite and $TiO_2$.

#ilmenite #Fe-selective chlorination #Ti-chlorination #kinetics #global fitting function

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