【摘要】 本文借助于光学显微镜、电子扫描显微镜等研究方法及烧结杯解剖等试验手段,研究了攀钢烧结矿的固结机理及钛在烧结过程中的行为。研究表明,攀枝花含钛铁精矿在烧结过程中首先生成铁酸钙,之后随温度升高铁酸钙和硅质物料反应生成硅酸盐熔体。最后成品矿由玻璃相,铁酸钙固结,钛赤铁矿的连晶也起一定的固结作用。烧结前92.42%的 TiO₂固溶于钛磁铁矿中,烧结后 TiO₂则赋存于钙钛矿,钛磁铁矿和钛赤铁矿中。随着烧结矿中 TiO₂含量增加,钙钛矿增加,铁酸钙减少。人工合成了块状钙钛矿,它的抗压强度只有83.3N/mm²。烧结过程中,钙钛矿主要在1200℃以上从熔体中析出。在现有原料条件下,减少钙钛矿的有效措施是采用低温氧化气氛烧结。更多还原

【Abstract】 The agglomeration mechanism of the sinter and the behaviour of titanium in the sinteringprocess have been studied by means of optical microscope observation,SEM analysis and dissectionof sinter pot.It was found that,during the agglomeration,calcium ferrite formed first which reacted withsiliceous metarials as the temperature increased,then silicate melt formed,and finally,the sinterwas agglomerated by glass phase and cacium ferrite.Titanohematite connection was one of theagglomeration formsTiO₂ was 92.42 wt.% in titanomagnetite as solid solution before sintering.But TiO₂ was dis-persed in perovskite,titanomagnetite and titanohematite in the sinter,The content of perovskitewas increasing and the content of calcium ferrite was decreasing with the increase of TiO₂ consti-tuent in the sinter.Block perovskite has been synthesised.Its stress strength was 83.3N/mm².Most of perovskite in the sinter crystallized from the melt when temperature was over 1200℃.Thebest way to decrease perovskite was to operate at low temperature with high oxygen potential.更多还原