硅酸盐学报Issue(7)：966-971,6.DOI:10.7521/j.issn.0454-5648.2013.07.14
还原铁法重构钢渣及其矿物组成
Steel Slag Reconstruction Experiment by Reduction FeOx and Its Mineral Composition
摘要
Abstract
Two steel slags from Liuzhou and Baoshan were reconstructed via reduction of FeOx. The experiments for direct reduction and melting reduction were carried out, respectively. The mineral composition of modified slag was analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The activity index of modified slag was determinated by a mortar strength testing method. The results show that iron oxide of the steel slag can be reduced into iron shot in the size range from 1 to 50μm when direct reduction is used, and the metallic iron particles are evenly distributed between minerals. The calcium ferrite phase, the manganolite, tricalcium silicate (C3S) of steel slag from Liuzhou, dicalcium silicate (C2S) of steel slag from Baoshan decompose in the modifica-tion process. The composition of calcium silicate phase after modification depends on the molar ratio of Ca/Si in the steel slag from Liuzhou. The RO phase is reduced into metallic iron and MgO. The higher the percentage of iron element in the steel slag from Liuzhou, the greater the reduction ratio will be. Moreover, the iron oxide in the steel slag can be reduced into Fe by melting reduction as Fe separates with slag by gravity, and the degree of reduction can reach 100%. Gehlenite, akermanite and dicalcium silicate are the constituents of modified slag by furnace cooling, which is similar to the hard slag. The content of vitreum in modified slag by wa-ter-granulating of the both steel slags is 97%and 73%, respectively, which is similar to the water-granulated slag. The activity index of modified slag increases significantly due to the reduction.关键词
钢渣重构/铁还原/矿物组成/胶凝活性Key words
steel slag reconstruction/iron reduction/mineral composition/cementitious activity分类
化学化工引用本文复制引用
殷素红,郭辉,余其俊,韦江雄..还原铁法重构钢渣及其矿物组成[J].硅酸盐学报,2013,(7):966-971,6.基金项目
中央级公益性科研院所基本科研业务费(CKSF2013042/JC)；国家“十一五”科技支撑计划(2006BAF02A24)后续研究。 （CKSF2013042/JC）
