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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-Al2O3-CaO·6Al2O3-Ca2Al2SiO7、CaO·6Al2O3-Ca2SiO4-Ca2Al2SiO7、Ca2Al2SiO7-Fe2SiO4。FeAl4O7、CaAl4O7以及金属铁在熔分渣中的含量较少。
The effects of slag basicity wCaO / wSiO2 on the slag phase composition and slag-iron separation of high-iron bauxite ore were studied by means of coal-based direct reduction melting technology, FactSage thermodynamic analysis software and XRD analysis. The experimental results show that the alkalinity of slag system has an important influence on the slag system and slag-iron separation of carbon-containing pellets. When the alkalinity is 1.0 and 1.5, the size of the grain iron is the largest, the separation effect of the slag iron is the best, and the yield of the grain iron is 91.55% and 91.86% respectively. When the basicity is 0.5, the grain iron size is small, Separation effect is poor, grain iron yield was 65.43%. When the alkalinity is 2.0, the grain size is the smallest, the slag and iron separation effect is the worst, and the yield of grain iron is only 44.53%. The results of XRD analysis show that the main components of slag are α-Al2O3-CaAl2Si2O8, α-Al2O3-CaO · 6Al2O3-Ca2Al2SiO7, CaO · 6Al2O3-Ca2SiO4 when the basicity of slag is 0.5, 1.0, 1.5 and 2.0 -Ca2Al2SiO7, Ca2Al2SiO7-Fe2SiO4. FeAl4O7, CaAl4O7 and metal iron slag in the slag content is less.