基于粉末煅烧技术合成FeTiO3和FeTiO3-Fe2 O3固溶体体系,在热力学分析的基础上,选取1150℃,以固溶体合成物为原料研究FeTiO3-Fe2 O3固溶体体系等温碳热还原过程,并采用X射线衍射仪和扫描电镜-能谱仪对还原产物进行系统分析。研究结果表明：合成产物内部成分均匀。钛铁矿的摩尔分数x越小,xFeTiO3-(1-x)Fe2O3固溶体碳热还原反应越易进行,并且反应速率最大值越大。在反应初期,假板钛矿相( FeTi2 O5-Fe2 TiO5( Fe3 Ti3 O10))作为过渡相一直存在,至金属Fe和钛铁晶石Fe2 TiO4生成后逐渐消失。
FeTiO3 and FeTiO3-Fe2 O3 solid solution systems were synthesized based on the ceramic method. The synthetic FeTiO3-Fe2 O3 solid solutions were subjected to isothermal carbothermal reduction experiments at 1150℃ combining with thermodynamic anal-ysis. The synthetic products were systematically studied by X-ray diffraction and scanning electron microscopy-energy dispersive spec-troscopy. The results show that the synthetic products are all ideal with homogeneous components. From the view of reduction, the smaller the value of x, the molar fraction of FeTiO3, the earlier the carbothermal reduction of xFeTiO3-(1-x)Fe2O3 solid solutions start, and the higher the maximum reduction rate is. As an intermediate phase, pseudobrookite ( FeTi2 O5-Fe2 TiO5 ( Fe3 Ti3 O10 ) ) does not disappear during the whole initial reduction stage until the formation of metal iron ( Fe) and ulv?spinel ( Fe2 TiO4 ) .