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本文运用电化学反应机理的观点和多相反应动力学理论研究了人造金红石(下文称金红石)熔盐氯化反应动力学。实验结果表明,氯化反应对还原剂而言符合收缩未反应核模型。熔体中的可变价组份(如铁)对氯化反应有催化作用。当铁浓度较低时,导出的动力学方程为1-(1-x)~(1/3)=pt~2+qt。氯化反应对氯气的表观反应级数为0.5。变价离子催化反应和氯原子直接放电反应的表观活化能分别为46和96kJ/mol。反应初期,氯化反应受化学反应控制,到了反应后期,逐渐转入混合控制区。
In this paper, the kinetics of molten salt chlorination of synthetic rutile (hereinafter referred to as rutile) has been studied using the electrochemical reaction mechanism and the theory of heterogeneous reaction kinetics. The experimental results show that the chlorination reaction accords with the shrinkage unreacted core model for the reductant. Variable components in the melt (such as iron) have a catalytic effect on the chlorination reaction. When iron concentration is low, the kinetic equation is derived as 1- (1-x) ~ (1/3) = pt ~ 2 + qt. The apparent reaction order of chlorination to chlorine is 0.5. The apparent activation energies of variable-valent ionic reaction and direct chlorine atom discharge were 46 and 96 kJ / mol, respectively. The initial reaction, the chlorination reaction controlled by the chemical reaction, to the late reaction, gradually transferred to the mixed control zone.