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为了弄清白云石造渣的机理,根据CaO-SiO_2-FeOn,MgO-SiO_2-FeOn,MgO-CaO-SiO_2,MgO-CaO-FeOn四个三元系所形成的CaO-MgO-FeOn-SiO_2四元系统,采用MgO初次相容积界面设计了所谓四元空间“低熔点”MgO饱和相图,并且用多次平行四面体棱投影法绘制了平面相图。在这个相图中发现了一根K-L临界线的存在。在这个线以上的炉渣组成的液限温度是随MgO含量的增加而提高;在这个线以下的则相反。在实验室中进行试验也证明了这个临界线的真实性。讨论了相图与实际生产的关系。应用这个相图,可以在氧气顶吹转炉炼钢生产中,对白云石的加入量和加入时间以及炉渣的岩相检验具有重要的参考意义。
In order to clarify the mechanism of dolomite slagging, CaO-MgO-FeOn-SiO_2 quaternary based on four ternary systems CaO-SiO 2 -FeOn, MgO-SiO 2 -FeOn, MgO-CaO-SiO 2 and MgO-CaO-FeOn System, the so-called “low melting point” MgO saturated phase diagram of the so-called quaternary space is designed by using the initial phase volume interface of MgO, and the planar phase diagram is drawn by multiple parallel tetrahedron projection methods. A K-L critical line was found in this phase diagram. The liquidus temperature composition of the slag above this line increases with increasing MgO content; the opposite is true below this line. Experiments in the laboratory also proved the authenticity of this critical line. The relationship between phase diagram and actual production is discussed. Application of this phase diagram, oxygen top-blown converter steelmaking production, the dolomite addition and time and slag lithofacies inspection has important reference value.