利用铁尾矿高温改性钢渣的性能  

Modifying the properties of steel slag by iron tailings at high temperature

作　　者：张作顺[1] 连芳[1] 廖洪强 杨淇[1] 曹文斌[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]首钢总公司能源环保产业事业部,北京100041

出　　处：《北京科技大学学报》2012年第12期1379-1384,共6页Journal of University of Science and Technology Beijing

基　　金：国家科技支撑计划资助项目(2011BAB03B05)

摘　　要：研究了铁尾矿高温改性处理对钢渣体积稳定性和胶凝性能的影响,结合X射线衍射分析、扫描电镜观察和能谱分析等测试方法,对改性钢渣的矿物组成和微观形貌进行了分析.发现铁尾矿的高温改性显著降低了钢渣中游离氧化钙(f--CaO)的含量,提高了钢渣胶凝性能.铁尾矿掺加质量分数为20%和处理温度为1250℃时,钢渣中f--CaO的质量分数由4.84%降低至1.82%,降幅达到62.4%,28d活性指数比原始钢渣体系提高5.6%.铁尾矿掺量由10%增加至30%时,改性钢渣中相继出现镁蔷薇辉石、镁黄长石和钙镁辉石等硅酸盐矿相.高温改性过程促使RO相分解,RO相中的FeO转化为磁铁矿相(Fe3O4).High-temperature modification by iron tailings was performed to study its influence on the volume stability and cementitious properties of steel slag. The mineral constituents and microstructure of steel slag after the high-temperature modification were analyzed via X-ray diffraction （XRD）, scanning electronic microscopy （SEM） and energy dispersive spectrometry （EDS）. It is found that the content of f-CaO obviously decreases and the cementitious properties of steel slag improve through the high-temperature modification. Compared with raw steel slag, the mass fraction of f-CaO in steel slag decreases from 4.84% to 1.82% after modification with 20% iron railings at 1250 ℃ and the activity index increases up to 5.6% after 28 d. With an increase in the mass fraction of iron tailings from 10% to 30% , silicate mineral phases such as manganolite, akermanite and calcium magnesium pyroxene form in the modified steel slag. The high-temperature modification promotes the decomposition of RO phase, in which FeO transforms to magnetite （ Fe3O4 ） simultaneously.

关 键 词：钢渣水泥 尾矿 改性 胶凝性能 

分 类 号：TQ172.9[化学工程—水泥工业]