摘要
通过热重分析方法研究了固态条件下高杂质钛铁矿的催化碳热还原机理。结果表明：杂质会阻碍钛铁矿还原，无催化剂时还原率较低，加入少量催化剂可以获得较高的还原率和较快的还原速度。催化剂不同的阴离子基团对反应有着不同的影响。在钠离子摩尔浓度相同的情况下，催化效果：四硼酸钠（Na2B4O7）〉氟化钠（NaF）〉氯化钠（NaCl）〉硅酸钠（Na2SiO3）。在温度860～1100℃范围内，钛铁矿碳热还原反应的主要控速环节是界面化学反应。无催化剂反应的表观活化能为260．976kJ／mol；添加四硼酸钠的一组表观活化能降低最多，为226．182kJ／mol。
In order to reduce the highly impure ilmenite by carbon at solid phase, the mechanism of the catalytic reduction of ilmenite by thermogravimetric analysis has been studied. The results show that im- purities hinder the process of ilmenite reduction. Low reduction rate occurs during the catalyst-free reduc- tion process while a higher reduction rate and a faster reduction velocity can be achieved by adding a small amount of catalyst. The different anionic groups of catalysts have different effects on the reaction. In the case of the same molar concentration of sodium ion, the catalyst having the best catalytic effect is Na2B4OT, successively followed by NaF, NaC1 and Na2SiO3. In the temperature range of 860 - 1 100 ℃, the main rate-controlling step for ilmenite reduction is the interfacial chemical reaction. The apparent activation energy of the Na2 B407 has the lowest catalyst-free reaction is 260. 976 kJ/mol; the reduction adding the catalyst of apparent activation energy of 226. 182 kJ/mol.
出处
《钢铁钒钛》
CAS
北大核心
2013年第6期1-5,共5页
Iron Steel Vanadium Titanium
基金
国家环保公益性行业科研专项课题(201209023)
国家十二五支撑课题(2012BAC20B1008)
关键词
钛铁矿
动力学
催化
热重分析
还原
ilmenite, kinetics, catalyzing, thermogravimetric analysis, reduction
