[w(TiO2)]对烧结矿矿相结构及软熔滴落性能的影响

 为了深入研究w(TiO2)]对烧结矿冶金性能的影响，通过SEM-EDS和荷重软化熔滴试验研究了不同TiO2质量分数对烧结矿矿相结构与软熔滴落性能影响。试验结果表明，随着烧结料中w(TiO2)]从1.40%增加到3.02%，烧结过程液相生成量先增加后减少，烧结矿中的赤铁矿、钙钛矿和硅酸盐等都有不同程度的升高，赤铁矿质量分数从20.69%增加到26.05%，其形态由原生赤铁矿逐步变为二次赤铁矿，磁铁矿和复合铁酸钙质量分数逐步减少，因此，适当增加烧结矿中w(TiO2)]（＜2%）有利于改善烧结矿的液相生成量，减少燃料消耗，提高烧结矿的转鼓强度；烧结矿中的钛主要以钙钛矿的形式存在，极少部分的钛固溶于复合铁酸钙和二次赤铁矿中；随着烧结矿中TiO2质量分数的增加，开始软化温度逐渐升高，试样软化开始温度t10]和试样软化终了温度t40]均在1 130 ℃以上，低钛烧结矿的软化温度区间ΔtA]为195 ℃，其余含钛烧结矿烧结矿的软化温度区间ΔtA]均在200 ℃以上。

Effects of[w(TiO2)]on mineral structure and softening-melting property of sinter

In order to investigate the effect ofw(TiO2)]on the metallurgical properties of sinter，influences ofw(TiO2)]on mineral structure and softening-melting property were investigated through SEM-EDS and drop test. The results indicated that with the increase ofw(TiO2)]from 1.40% to 3.02% in sinter， the contents of hematite， perovskite， and silicate in sinter increased， while mass of magnetite and complex calcium ferrite gradually reduced. The hematite content increased from 20.69% to 26.05% with crystal phase changing from native hematite to secondary hematite， which had a negative effect on the tumbler strength and low temperature reduction degradation of sinter. Therefore， increase ofw(TiO2)]in sinter （＜2%） contributed to the development of liquid phase， the reduction of fuel consumption，and the increase of the sinter drum strength. Ti in sinter was mainly distributed in perovskite， but less in SFCA and secondary hematite. With the increase ofw(TiO2)]in the sinter， the soften temperature（t10 and t40）]increased， which was above 1 130 ℃. The soften intervalΔtA]of sinter containing 1.4%w(TiO2)]is 195 ℃， whileΔtA]are more than 200 ℃.