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Thermodynamic simulation on mineralogical composition of CaO–SiO2–Al2O3–MgO quaternary slag system

机译：CaO–SiO2–Al2O3–MgO季渣系统矿物组成的热力学模拟

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摘要

It is necessary to elucidate the crystallization thermodynamic of mineralogical phases during the cooling process of the molten BFS with different chemical composition, because the high-melting point mineral phase maybe crystallized during the fiber forming and thereafter cooling process. Thermodynamic calculation software FactSage6.4 and the hot remelting experiments were performed to explore the influence of basicity, Al2O3 content and MgO content on the crystallization of mineralogical components and their transformation. The results showed that the main mineralography of the CaO–SiO2–Al2O3–MgO quaternary slag system was melilite, and a certain amount of anorthite and calcium metasilicate. The crystallographic temperature of melilite is increased with the increasing of basicity, MgO and Al2O3 content, which has a significant impact on the utilization performance of the mineral wool prepared with the hot blast furnace slag directly. With the increasing of basicity, there was a tendency that crystallographic amount of melilite increased to the summit and then declined, while the amount of anorthite and calcium metasilicate decreased consistently. Finally, these two mineralogical components could be replaced by magnesium rhodonite and spinel with the increasing of basicity. When the basicity and MgO content were 1.0 and 9 %, the crystallographic mass ratio of melilite and anorthite increased, while that of calcium silicate declined, and replaced by spinel finally with the increasing of Al2O3 content. When the basicity and Al2O3 content were 1.0 and 13 %, the crystallographic mass ratio of melilite increased, while that of anorthite and calcium silicate declined, and replaced by pyroxene and spinel with the increasing of MgO content. To decline fiberization temperature of the melt BFS, the basicity, MgO and Al2O3 content should be decreased during the modification process of chemical composition, because the crystallization temperature of the primary crystalline phase in the slag system without modification.
机译：有必要阐明在化学成分不同的熔融BFS的冷却过程中矿物相的结晶热力学，因为高熔点矿物相可能在纤维形成和随后的冷却过程中结晶。进行了热力学计算软件FactSage6.4和热重熔实验，以探讨碱度，Al2O3含量和MgO含量对矿物组分结晶及其转化的影响。结果表明，CaO–SiO2–Al2O3–MgO季渣系统的主要矿物学为硅镁石，一定量的钙长石和偏硅酸钙。碱度，MgO，Al2O3含量的增加，均绿沸石的结晶温度升高，这对直接由热风炉渣制备的矿棉的利用性能有重要影响。随着碱度的增加，硅镁石的结晶量呈上升至顶峰然后下降的趋势，而钙长石和偏硅酸钙的含量一致下降。最后，随着碱度的提高，这两种矿物学成分可以被镁镁合金和尖晶石代替。当碱度和MgO含量分别为1.0和9％时，陨石和钙长石的结晶质量比增加，而硅酸钙的结晶质量比下降，随着Al2O3含量的增加最终被尖晶石代替。当碱度和Al2O3含量分别为1.0和13％时，陨石的晶体学质量比增加，钙长石和硅酸钙的晶体学质量比下降，随着MgO含量的增加被辉石和尖晶石代替。为了降低熔体BFS的纤维化温度，在化学成分的改性过程中应降低碱度，MgO和Al2O3含量，因为炉渣系统中初晶相的结晶温度未经改性。

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