w(TiO_2)对烧结矿矿相结构及软熔滴落性能的影响  

Effects of w(TiO_2) on mineral structure and softening-melting property of sinter

作　　者：王耀祖[1] 张建良[1] 刘征建[1] 张亚鹏[1] 刘东辉[1] 杜诚波 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁》2017年第10期20-28,共9页Iron and Steel

基　　金：国家自然科学基金资助项目(51504216)

摘　　要：为了深入研究w(TiO_2)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TiO_2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(TiO_2)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(TiO_2)(<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TiO_2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t_(10)和试样软化终了温度t_(40)均在1 130℃以上,低钛烧结矿的软化温度区间Δt_A为195℃,其余含钛烧结矿的软化温度区间Δt_A均在200℃以上。In order to investigate the effect of w（TiO2） on the metallurgical properties of sinter, influences of w（TiO2） on mineral structure and softening-melting property were investigated through SEM-EDS and drop test. The results indicat- ed that with the increase of w（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 in- creased 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 of w（TiO2） in sinter （ 〈 2%） contributed to the development of liquid phase, the reduction of fuel consumption, and the in- crease of the sinter drum strength. Ti in sinter was mainly distributed in perovskite, but less in SFCA and secondary he- matite. With the increase ofw（TiO：） in the sinter, the soften temperature （t,0 and t4o） increased, which was above 1 130 ~C. The soften interval AtA of sinter containing 1.4% w（TiO2） is 195 ~C, while AtA are more than 200 ~C.

关 键 词：钒钛磁铁矿 矿相结构 液相生成量 荷重软化熔滴性能 

分 类 号：TF046.4[冶金工程—冶金物理化学]