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Kinetics of Zn Removal from ZnO–Fe2O3–CaCl2 System

机译：ZnO–Fe 2 O 3 –CaCl 2 系统中锌的去除动力学

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摘要

The chlorination and evaporation behaviors of Zn in the ZnO–Fe_(2)O_(3)–CaCl_(2) system was studied by gravimetry from 1173 to 1323 K and the effects of carrier gas flow rate, temperature and the initial Zn content of specimen on the chlorination rate were investigated. Moreover, thermodynamic calculation was carried out. Fe and Zn were separated because Zn was selectively chlorinated by CaCl_(2) from ZnO–Fe_(2)O_(3) system and volatilized as ZnCl_(2) while Fe remained as oxide in chlorinated residue. From the chemical analyses, it was clarified that the volatilization of ZnCl_(2) mainly cause the weight loss of specimen. Based on these results, the chlorination mechanism and kinetic model were discussed. The weight change of specimen was expressed as a function of reaction time reasonably well by assuming the first order reaction with respect to presumed ZnCl_(2). Apparent activation energy of chlorination reaction, calculated from obtained reaction rate constants for various initial Zn contents, was in the range between 107 and 172 kJ/mol. It is considered the rate determining step of chlorination is chemical reaction, such as the reaction between ZnO and CaCl_(2), or the interfacial evaporation of ZnCl_(2) from the specimen.
机译：用1173〜1323 K的重量法研究了ZnO–Fe_（2）O_（3）–CaCl_（2）体系中Zn的氯化和蒸发行为，以及载气流量，温度和初始Zn含量的影响。对试样的氯化率进行了调查。此外，进行了热力学计算。 Fe和Zn分离是因为Zn是通过CaCl_（2）从ZnO–Fe_（2）O_（3）体系中选择性氯化而挥发成ZnCl_（2），而Fe仍以氧化物形式保留在氯化残留物中。从化学分析可以看出，ZnCl_（2）的挥发主要是造成样品失重的原因。基于这些结果，讨论了氯化机理和动力学模型。通过假设相对于假定的ZnCl_（2）的一级反应，将样品的重量变化较好地表示为反应时间的函数。由获得的各种初始Zn含量的反应速率常数计算得出的氯化反应的表观活化能在107和172kJ / mol之间。认为氯化的速率决定步骤是化学反应，例如ZnO与CaCl_（2）之间的反应，或ZnCl_（2）从样品中的界面蒸发。

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