钢渣矿相组成及其显微形貌分析  

Analysis of mineralogical composition in steel slag and its microstructure

作　　者：张玉柱[1] 雷云波[1] 李俊国[1] 邢宏伟[1] 韩志杰[2] 龙跃[1] 

机构地区：[1]河北联合大学冶金与能源学院,河北唐山063009 [2]河北钢铁股份有限公司唐山分公司,河北唐山063016

出　　处：《冶金分析》2011年第9期11-17,共7页Metallurgical Analysis

基　　金：973专项资助项目(2008CB617602);国家科技支撑计划资助项目(2008BAE67B00)

摘　　要：利用X射线衍射法分析了钢渣(缓冷渣、气淬渣、热焖渣)中主要矿物组成,采用金相光学显微镜观察了其各自的显微形貌,并且采用平行截线法分析了具有相同形貌特征相的晶粒度。结果表明,由于化学组成相近,缓冷渣、气淬渣和热焖渣的主要物相均为硅酸二钙、RO相和铁酸钙,以及少量硅酸三钙、f-CaO和f-MgO;在三类钢渣中,C3S为黑色板状晶体,C2S为黑色圆粒状与枝状晶,铁酸钙相多为灰色无定形状,并以连续的形式填充于其他物相中;铁镁相多数呈现白色无定形状,连续延伸于黑色相与灰色相中;高温段冷却强度对钢渣中各类典型矿物晶粒度的影响较大,呈现出冷却强度越高,矿相晶粒度越小的趋势,因此热焖渣矿物晶粒度最大、气淬渣矿物晶粒度最小、缓冷渣矿物晶粒度居中。Major mineralogical composition in steel slag including slow cooling slag,gas quenching slag and hot stew slag were analyzed respectively by X-ray diffraction.The microstructure of mineralogical phase in these three kinds of steel slag was observed through metallographic optical microscope,and their grain sizes with the same morphological characteristic phase were analyzed by parallel intercept method.The results showed that the main phases in these slags were all dicalcium silicate,RO phase and calcium ferrite,and a little tricalcium silicate,f-CaO and f-MgO because of their similar chemical composition.In these three steel slags,tricalcium silicate was black tabular crystal,dicalcium silicate was black round granular and dendritic crystal,calcium ferrite was gray amorphous state and continuously filled in other phases.The iron and magnesium phase mostly appeared white amorphous state and was continuously spread in blank phase and gray phase.The cooling intensity in high temperature segment had great influence on the grain size of typical minerals.The tendency was as follows： higher cooling intensity,smaller grain size.Therefore,the grain size was the largest in hot stew slag,the smallest in gas quenching slag,and moderate in slow cooling slag.

关 键 词：缓冷渣 气淬渣 热焖渣 显微结构 矿物组成 晶粒度 

分 类 号：X756[环境科学与工程—环境工程]