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对钒钛磁铁精矿制成的球团矿用热天秤和显微镜研究其气体还原的动力学规律和还原的机理。钒钛磁铁矿球团矿的气相还原,在温度为1050℃以下时以扩散控制为主,而在1050℃以上时以界面化学反应控制为主。可用二元线性方程来表示。并由此求得其速率方程为B_1和B_2可由实验求得。计算了界面反应速度常数K_B和扩散速度常数K_d的值与相应的活化能。钒钛磁铁矿的界面化学反应在温度为1000℃以下时是含钦铁矿物还原为钦铁矿的化学反应。而在1000℃以上时则为钦铁矿还原成金属铁的化学反应。球团矿的粒度和孔隙度不影响还原的动力学规律和机理。铁矿石的还原机理和动力学过程,已作过了大量的和详细的研究了(1)。并为阐明高炉冶炼过程和高炉或竖炉数学模型提供了可靠的理论基础。钒钛磁铁矿中含的二氧化钛是与铁的氧化物结合成各种化合物的。同时,钛又是一个变价的元素,故钛磁铁矿的还原过程比之一般的铁矿石就复杂得多了。本工作只是就这个课题做一些初步的探讨。
The kinetics of gas reduction and the mechanism of reduction were studied by thermogravimetry and microscopy on pellets made from vanadium-titanium magnetite concentrate. Vapor-phase reduction of vanadium-titanium magnetite pellets dominated diffusion control at temperatures below 1050 ° C, with interfacial chemical reaction dominated above 1050 ° C. Available binary linear equations to represent. And thus obtained the rate equation B_1 and B_2 can be obtained experimentally. The interfacial reaction rate constant K_B and diffusion rate constant K_d were calculated and the corresponding activation energy was calculated. Vanadium-titanium magnetite interface chemical reaction at a temperature below 1000 ℃ is the chemical reaction with the reduction of iron ore to gold ore. While above 1000 ℃, it is the chemical reaction that the iron ore is reduced to metallic iron. The particle size and porosity of pellets do not affect the kinetics and mechanism of reduction. Iron ore reduction mechanism and kinetic processes have been studied extensively and in detail (1). And provide a reliable theoretical basis for clarifying the blast furnace smelting process and the mathematical model of blast furnace or shaft furnace. Titanium dioxide contained in vanadium titanomagnetite is combined with iron oxide into various compounds. At the same time, titanium is a variable element, so the reduction process of titanium magnetite is much more complicated than the average iron ore. This work is to do some preliminary discussions on this topic.