为提高热闷钢渣的资源化利用水平，利用X射线荧光光谱仪、X射线衍射仪、扫描电镜和能谱分析仪对3家钢厂热闷钢渣的矿物学特征进行研究，并用热力学软件FactSage对其冷却过程中硅酸钙相的析出情况进行研究。结果表明，热闷钢渣的主要物相组成为硅酸钙相、RO相及铁酸钙相。热闷钢渣物相的晶体发育较好，晶体尺寸较大，硅酸钙相晶体的形状也较为规则。在平衡冷却的过程中，硅酸钙依次以α-C2S、α,-C2S、C3MS2固溶体以及γ-C2S的形式析出，α-C2S在1510~1520℃析出，α,-C2S在1440℃析出，C3MS2固溶体在1200~1300℃析出，而γ-C2S的析出温度则随C3MS2固溶体析出量的不同变化较大。
To improve the resource recycling level of pyrolytic slag, X-ray ifnorence, X-ray diffraction, SEM and EDS were used to study mineralogy characteristics of pyrolytic slags of three steel plants, and FactSage was used to study precipitation regularities of calcium silicate phase of pyrolytic slags. The results show that the main phases of pyrolytic slag are calcium silicon phase, RO phase and calcium ferrite phase. Crystal of each phase in pyrolytic slag grows well, and the crystal size is big, and crystal shape of calcium silicon phase is regular. In the equilibrium cooling process of pyrolytic slag, calcium silicon phase in turn precipitates in forms ofα-C2S,α’-C2S, C3MS2 solid solution andγ-C2S.α-C2S precipitates at 1 510—1 520℃,α’-C2S precipitates at about 1 440℃, C3MS2 solid solution precipitates at 1 200—1 300℃, the precipitating temperature ofγ-C2S changes depending on the precipitation amount of C3MS2 solid solution.
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