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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 sinter.With the discovery of Ca_3TiFe_2O_8 as a mineral in vanadium-titanium sinter, its formation mechanism is not yet clear.In this paper, X-ray diffraction, elemental energy spectrum and TG-DSC The formation mechanism of Ca_3TiFe_2O_8 and the formation regularity of Ca_3TiFe_2O_8 under different temperatures and CaO and TiO_2 were studied.The results show that Ca_3TiFe_2O_8 is formed by the reaction of Ca_2Fe_2O_5 and Ca_ Ti_O_3, that is, CaO and Fe_2O_3 react to form Ca_2Fe_2O_5. CaTiFe_2O_8 reacted with CaTiO3 to form Ca_3TiFe_2O_8.The longer the reaction time, the larger the formation of Ca_3TiFe_2O_8, but the effect of reaction temperature on the formation of Ca_3TiFe_2O_8 was not obvious.In addition, the higher the CaO content, the easier Ca_3TiFe_2O_8 is generated, and the equimolar Fe2O3 and As long as there is TiO 2 under CaO, Ca_3TiFe_2O_8 will be formed.