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Investigation on Ilmenite Reduction Strengthening Technology and Mechanism

Author: LiuHeMei
Tutor: GuoYuFeng
School: Central South University
Course: Iron and steel metallurgy
Keywords: Ilmenite High - pressure roller mill Reduction Additive
CLC: TF041
Type: Master's thesis
Year: 2010
Downloads: 161
Quote: 1
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Abstract


Rich reserves of Panxi ilmenite resources, high pressure roller mill pretreatment and additives Panxi ilmenite reduction system, the use of kinetic analysis and X-ray diffraction (XRD), optical microscopy and scanning electron microscopy and other modern means of microscopic tests of the high-pressure roll mill pretreatment and additives to strengthen the mechanism of the of ilmenite ball original in-depth study made the following conclusions: (1) high-pressure roller mill can significantly improve the metallization of ilmenite reduction product the controllability of the link of the reduction reaction rate, but does not change. 1000 ℃ -1150 ℃ range, the high-pressure roll mill pretreatment ilmenite reduction reaction process is still under control of the chemical reaction of the interface, but not pretreatment, and the apparent activation energy of reduce the 18.751kJ/mol of. The mechanism of action of high pressure roller mill, high pressure roller mill pretreatment of the fine fraction content increased significantly, a substantial increase in the specific surface area, improve the kinetics of the reduction reaction process conditions. (2) additives can further enhance the metallization ratio of the reduction product of the high-pressure roller mill pretreated ilmenite, but different kinds of additives to improve the amplitude varies. Add Na2B4O7 level of increase, the reduction product metallization rate than the ore improve by 3.73%, followed by Na2CO3, increased 3.31%, once again NaF, NaOH, Na2SO4 and NaCl. (3) the study of the impact of the additive on the high-pressure roll mill pretreatment ilmenite non-isothermal kinetics of the reduction reaction show that borax outside, other additives non-isothermal reduction curves have a similar law, in 1000 ℃ ago, the impact of the reduction reaction rate after impact on the reduction reaction rate is reduced, the reduction reaction rate is close to the non-additive. Borax on the reaction rate on the contrary, when the temperature higher than 1100 ° C, the reduction reaction rate is greater than the no additive. (4) borax isothermal kinetics of the reduction reaction of the high-pressure roll mill pretreatment ilmenite 1000 ℃ -1150 ℃, add borax restore process interface is still subject to the control of chemical reactions, and without borax high pressure roller mill compared to pretreatment ilmenite apparent reaction activation energy decreased 8.687kJ/mol. (5) borax microscopic mechanism of enhanced ilmenite restore borate with the reaction the ilmenite of MgO and MnO, block Mg and Mn the unreacted core migration enrichment effect, improving the ilmenite reduction process The Central Asian Sizzling perovskite restore. The thesis studied for the first time the effect and mechanism of high-pressure roller mill ilmenite restore. On this basis, the in-depth study of the additives to strengthen the mechanism of ilmenite reduction, developed a high-pressure roller mill additives Cooperative Reinforcement ilmenite restore new technology. In this study, ilmenite as the main means to restore law system to take rich state material process innovations provide new theoretical and technical support.

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CLC: > Industrial Technology > Metallurgical Industry > General issues > Smelting of raw materials and ore pretreatment > Ore
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