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高铁型铝土矿和高铁赤泥资源丰富,储量巨大,仅我国就有约15亿t的高铁型铝土矿资源,而全球的高铁赤泥库存量达27亿t以上,并以1.2亿t/a的速度增长。高铁铝土矿和高铁赤泥中的Al2O3和Fe2O3的含量在50%左右,而且还含有丰富有价金属资源,采用传统的处理方式不仅造成了严重的环境污染,而且还造成了大量的资源浪费。采用直接还原熔分制备粒铁和C12A7渣系,并对C12A7渣系进行氧化铝浸出的方法是可行的。只有当混合物处在C2S到C12A7的渣线附近时(即C/S=2.0,C/A=1.7),冷却析晶的平衡相中才会出现C2S和C12A7。实验结果表明,当渣系碱度为3.85时,渣铁的分离效果良好,粒铁收得率在90%以上,还原熔分后熔分渣系的组成主要为C2S和C12A7,二者含量在85%左右,C3AS3(石榴石)和C2AS(钙铝黄长石)的含量很少,在10%左右,实验结果和理论分析基本一致。
High-speed railway bauxite and high-speed railway red mud is abundant in resources and reserves are huge. In China alone, there are about 1.5 billion t of high-speed railway bauxite resources. The world’s high-speed railway red mud stocks have reached more than 2.7 billion tons, / a speed increase. High-iron bauxite and high-speed railway red mud in the Al2O3 and Fe2O3 content of about 50%, but also rich in valuable metal resources, the use of traditional methods not only caused serious environmental pollution, but also caused a lot of waste of resources . It is feasible to prepare PM12 and C12A7 slag system by direct reduction melting and alumina leaching of C12A7 slag system. Only when the mixture is near the slag line of C2S to C12A7 (C / S = 2.0, C / A = 1.7), C2S and C12A7 appear only in the equilibrium phase of cooling crystallization. The experimental results show that when the alkalinity of slag system is 3.85, the separation effect of slag iron is good and the yield of iron particles is above 90%. The composition of the slag system after reduction reduction is mainly C2S and C12A7, The content of C3AS3 (Garnet) and C2AS (Calcium Aluminum Yellow feldspar) is very low at about 85%. The experimental results are basically consistent with the theoretical analysis.