论文部分内容阅读
试验采用煤基直接还原熔分技术和热力学分析手段,对高铁铝土矿含碳球团在还原熔分过程中的渣相组成机理进行了研究。试验结果表明,渣系碱度对粒铁的收得率和粒铁尺寸以及渣系组成有重要影响。当碱度为1.00、2.00、3.85时,粒铁收得率分别为91.55%、44.53%和88.48%,粒铁尺寸分别为15.50、7.00和8.54 mm;熔分渣的相组成(质量分数)分别为55%A-34%CA6-6%C2AS-4%Fe、64%A-35%C2AS-2%Fe、24%C2S-62%C12A7-7%C2AS-4%C3AS3-3%Fe;当渣系碱度为3.85时,还原熔分渣系的组成主要为C2S和C12A7,两者质量分数约为85%;只有当混合物处在C2S到C12A7的渣线上或者渣线附近时(即R=3.85时),冷却析晶的平衡相中才会出现C2S和C12A7。
In the experiment, coal-based direct reduction melting and thermodynamic analysis were used to study the slag phase composition mechanism of high-speed bauxite carbon-containing pellets during reduction and melting process. The experimental results show that the basicity of slag system has an important influence on the yield of iron and iron, the size of iron and the composition of slag system. When the alkalinity was 1.00, 2.00 and 3.85, the recoveries of granular iron were 91.55%, 44.53% and 88.48%, respectively, and the grain sizes were 15.50, 7.00 and 8.54 mm respectively. The phase composition (mass fraction) Is 55% A-34% CA6-6% C2AS-4% Fe, 64% A-35% C2AS- 2% Fe, 24% C2S-62% C12A7-7% C2AS- 4% C3AS3-3% When the alkalinity of the slag system is 3.85, the composition of the reduction slag system is mainly C2S and C12A7, the mass fraction of the two is about 85%; only when the mixture is on the slag line of C2S to C12A7 or near the slag line = 3.85), C2S and C12A7 appear in the equilibrium phase of cooling crystallization.