Application of Thermodynamics on Reaction of Carbochlorination of Titania-rich Slag in Molten Salt Chlorination
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摘要: 通过对高钛渣各组分氧化物加碳氯化反应的热力学计算与分析，发现循环氯气中的氧气与石油焦的燃烧反应是影响熔盐氯化炉温度的主要因素，而炉温的稳定控制是提高熔盐氯化炉运行效率的关键；在900~1 500 K时，高钛渣加碳氯化热力学趋势表明：所有氧化物在氯化过程中全部转变为氯化物，但实际反应中Al2O3、尤其是SiO2仅有很小一部分被氯化，同时确定了此温度区间各组分氧化物加碳氯化难易顺序；热力学条件对TiO2和SiO2氯化率的影响近于一致，所以从热力学角度不能进一步有效降低SiO2的氯化率而减少TiCl4中Si含量。Abstract: It is the major factor that combustion reaction of the return of oxygen in chlorine with petroleum coke affecting the temperature of molten salt chlorinator by calculation and analysis of carbochlorination thermodynamic of all oxides of titania-rich slag, temperature stability controlling is the key to further improve the operational efficiency of molten salt chlorinator;the thermodynamics trends of carbochlorination of titania-rich slag suggest that all of the oxides would be chlorinated into chloride during 900~1 500 K, while Al2O3 and SiO2 in particular are very limited in fact, the order of carbochlorination of all oxides is determined and the chlorination rate of TiO2 and SiO2 is the same.So in terms of thermodynamics it is so hard to low the rate of chlorination of SiO2 further to reduce the content of Si in TiCl4.
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