肯尼亚天然金红石矿流化床氯化率的研究

Fluidized-Bed Chlorination Rates of Kenya Rutile Ore

摘要:

对肯尼亚金红石矿加碳氯化体系的热力学和动力学进行了研究，分析表明，C在固相中过量，体系处于平衡态时，TiCl4和CO是仅有的2个稳定的产物，增加C/TiO2比对产物组成影响不大；高温时，TiO2与C和Cl2生成CO的方程是占主导地位的。本实验提出了一个反应速率模型，得到金红石氯化率的公式，与实验数据吻合较好。反应速率与颗粒初始半径和天然金红石密度有关，在900 ℃到1000 ℃温度范围内，表观活化能为10.569 kJ/mol，扩散是反应的主要控制步骤。得到了C-Cl2体系中氯气反应率表达式，氯气反应率取决于反应程度、氯气浓度和焦炭粒径。

Abstract:

The thermodynamics and kinetics of natural rutile carbochlorination have been investigated in a fluidized-bed. Thermodynamic analysis of this system reveals that when C is excess in the solid phase, TiCl4 and CO are the only two stable products in the chemical equilibrium compositions system, and the increase of the ratio of C to TiO2 has little effect on the product composition. At high temperature, the reaction with CO as the product is the dominant reaction. This paper proposed a reaction rate model, and got a rutile chlorination rate formula, which is more consistent with experimental data. For the TiO2-C-Cl2 system, the reaction rate is dependent on both size and density of natural rutile. From 900 to 1000 oC, the apparent activation energy is 10.569 kJ/mol. In this temperature range, mass diffusion is the main reaction controlling step. The expression of the chlorine reaction rate in the C-Cl2 system was obtained, and it depends on the degree of reaction, Cl2 concentration and the size of coke.