| CaO--TiO2--Fe2O3三元系中Ca3TiFe2O8的生成机理 |
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| 作者姓名： | 项南 郭玉峰 郭兴敏 |
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| 作者单位： | 北京科技大学钢铁冶金新技术国家重点实验室,北京100083;北京科技大学冶金与生态工程学院,北京100083;北京科技大学钢铁冶金新技术国家重点实验室,北京100083;北京科技大学冶金与生态工程学院,北京100083;北京科技大学钢铁冶金新技术国家重点实验室,北京100083;北京科技大学冶金与生态工程学院,北京100083 |
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| 基金项目： | 国家自然科学基金资助项目(U1460201,51374017) |
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| 摘 要： | 钒钛磁铁矿是烧结矿重要的原料之一,Ca3TiFe2O8作为钒钛烧结矿中矿物被发现之后,其生成机理尚不明确.本文采用X射线衍射分析、元素能谱分析和TG-DSC分析相结合的方法,研究了Ca3TiFe2O8的生成机理以及不同温度、CaO与TiO2含量下Ca3TiFe2O8的生成规律.实验结果表明,Ca3TiFe2O8由Ca2 Fe2O5和CaTiO3反应生成,即CaO和Fe2O3反应生成Ca2 Fe2O5;其后,与CaTiO3反应生成Ca3TiFe2O8.反应时间越长,Ca3TiFe2O8的生成量越大,但反应温度对Ca3TiFe2O8生成的影响并不明显.另外,还发现CaO含量越高,Ca3TiFe2O8越易于生成,而且等摩尔Fe2O3和CaO下只要存在TiO2,就会有Ca3TiFe2O8生成.
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| 关 键 词： | 钒钛磁铁矿 烧结 Ca3TiFe2O8 生成机理 生成规律 |
| 收稿时间： | 2016-12-01 |
Formation mechanism of Ca3TiFe2O8 in a CaO-TiO2 -Fe2O3 system |
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| Affiliation: | 1) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China2) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Vanadium-titanium magnetite is one of the important raw materials for iron making in a blast furnace. Ca3TiFe2O8, which is a mineral of vanadium-titanium sinter, was discovered to form during the process; however, its formation mechanism is not clear. In this work, an X-ray diffraction analysis, an elemental spectroscopy, and a TG-DSC were employed to investigate the formation mechanism of Ca3TiFe2O8 and the formation law at different temperatures and at CaO and TiO2 contents in the CaO-TiO2 -Fe2O3 system. The formation mechanism of Ca3TiFe2O8 is clarified:CaO reacts with Fe2O3 to form Ca2 Fe2O5, and then continues to react with the CaTiO3 to form Ca3TiFe2O8. The longer the reaction time, the greater is the amount of Ca3TiFe2O8 formed. However, the effect of temperature on the formation of Ca3TiFe2O8 is not obvious. It is found that high CaO content contributes to the formation of Ca3TiFe2O8. Further, so long as TiO2 is present, Ca3TiFe2O8 is formed under the condition of equal molar concentration Fe2O3 and CaO. |
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