采用煤基直接还原熔分技术和FactSage热力学分析软件以及XRD分析手段,研究了渣系碱度wCaO/wSiO2对高铁铝土矿含碳球团渣相组成和渣铁分离效果的影响.实验结果表明,渣系碱度对含碳球团的渣系组成和渣铁分离效果有重要影响.当碱度为1.0和1.5时,粒铁尺寸最大,渣铁的分离效果最好,粒铁收得率分别为91.55％和91.86％;当碱度为0.5时,粒铁尺寸较小,渣铁分离效果较差,粒铁收得率为65.43％.当碱度为2.0时;粒铁尺寸最小,渣铁分离效果最差,粒铁收得率只有44.53％.XRD分析结果表明,当渣系碱度分别为0.5、1.0、1.5和2.0时,熔分渣的主要组成分别为α-Al2O3-CaAl2Si2O8、α-Al203-CaO·6Al2 O3-Ca2Al2SiO7、CaO·6Al2O3-Ca2SiO4-Ca2Al2SiO7、Ca2Al2SiO7-Fe2SiO4.FeAl4O7、CaAl4O7以及金属铁在熔分渣中的含量较少.
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