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本文在分析研究有关二氧化锡还原动力学资料的基础上,提出了气体还原二氧化锡的反应机理,即2SnO_2(s)+2R=2SnO(s)+2RO2SnO(s)=Sn(L)+SnO_2(s)SnO_2(s)+2R=Sn(L)+2RO按照上述机理,建立了成核长大和界面反应的非等温过程动力学的数学模型。由模型所获得的气体还原二氧化锡的成核长大和界面反应的活化能分别为:217.1 KJ/mol,128.3KJ/mol(51.851和30.642Kcal/mol)(在 CO 气流中,温度为620°～840℃)和168.2KJ/mol,934.4KJ/mol(40.172和22.307Kcal/mol)(在 H_2气流中,温度为480°～700℃),实验结果表明这些活化能与文献报道的基本一致。
In this paper, the reaction mechanism of gas reduction of tin dioxide is proposed based on the analysis of the data on the reduction kinetics of tin dioxide, that is, 2SnO 2 (s) + 2R = 2SnO (s) + 2RO2SnO (s) = Sn (L) + SnO_2 (s) SnO 2 (s) + 2R = Sn (L) + 2RO According to the above mechanism, a mathematical model of non-isothermal kinetics of nucleation and growth and interfacial reaction was established. The nucleation-growth and interfacial activation energies of the gas-reduced tin dioxide obtained from the model are 217.1 KJ / mol and 128.3 KJ / mol respectively (51.851 and 30.642 Kcal / mol) (in a CO gas stream, the temperature is 620 ° C ~ 840 ℃) and 168.2KJ / mol, 934.4KJ / mol (40.172 and 22.307Kcal / mol) respectively. The experimental results show that these activation energies are consistent with those reported in the literature.