摘要
钒钛磁铁矿是烧结矿重要的原料之一,Ca_3TiFe_2O_8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Ca_3TiFe_2O_8的生成机理以及不同温度、CaO与TiO_2含量下Ca_3TiFe_2O_8的生成规律.实验结果表明,Ca_3TiFe_2O_8由Ca2Fe2O5和Ca Ti O3反应生成,即CaO和Fe2O3反应生成Ca2Fe2O5;其后,与Ca Ti O3反应生成Ca_3TiFe_2O_8.反应时间越长,Ca_3TiFe_2O_8的生成量越大,但反应温度对Ca_3TiFe_2O_8生成的影响并不明显.另外,还发现CaO含量越高,Ca_3TiFe_2O_8越易于生成,而且等摩尔Fe2O3和CaO下只要存在TiO_2,就会有Ca_3TiFe_2O_8生成.
Vanadium-titanium magnetite is one of the important raw materials for iron making in a blast furnace. Ca_3TiFe_2O_8,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 Ca_3TiFe_2O_8 and the formation law at different temperatures and at CaO and TiO_2 contents in the CaO-TiO_2-Fe_2O_3 system. The formation mechanism of Ca_3TiFe_2O_8 is clarified： CaO reacts with Fe_2O_3 to form Ca2 Fe2 O5,and then continues to react with the Ca Ti O3 to form Ca_3TiFe_2O_8. The longer the reaction time,the greater is the amount of Ca_3TiFe_2O_8 formed. However,the effect of temperature on the formation of Ca_3TiFe_2O_8 is not obvious. It is found that high CaO content contributes to the formation of Ca_3TiFe_2O_8. Further,so long as TiO_2 is present,Ca_3TiFe_2O_8 is formed under the condition of equal molar concentration Fe_2O_3 and CaO.
作者
项南
郭玉峰
郭兴敏
X;GUO Yu-feng;GUO Xing-min(State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijlng 100083, China)
出处
《工程科学学报》
EI
CSCD
北大核心
2017年第11期1669-1673,共5页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(U1460201
51374017)
