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。
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-Cl system, the reaction rate is dependent on both size and density of natural rutile. From 900 to 1000 ℃, 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-C12 system was obtained, and it depends on the degree of reaction, Cl2 concentration and the size of coke.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第6期1377-1380,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51374064
51004033
51074044
57304043)
关键词
天然金红石
气-固反应
流化床
加碳氯化
颗粒
natural rutile
gas-solid reaction
fluidized bed
carbochlorination
particle