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研究了MgO含量变化对CaO-Al_2O_3-MgO-Fe_xO-SiO_2-K_2O系熔体黏度和熔化特性的影响,结合X射线衍射和扫描电镜分析熔渣冷却过程中的物相析出,并通过Fact Sage软件计算了该体系的黏度、熔点和冷却过程中析出相的含量与温度的关系,并与实验结果进行了对比和分析.结果表明,MgO含量的增多会造成熔渣熔化温度的升高,黏度随温度变化时会出现黏度骤增的转折点,高于转折点温度时,熔渣黏度随MgO含量变化不大,同时该转折点温度随MgO含量的增加而升高.在熔渣冷却过程中析出相主要为固溶的橄榄石相和Fe3O4尖晶石相,MgO含量的增大可以促进橄榄石相的析出,熔体黏度骤增主要由于橄榄石相的析出造成的.
The influence of the content of MgO on the melt viscosity and melting characteristics of CaO-Al_2O_3-MgO-Fe_xO-SiO_2-K_2O system was studied. The phase precipitation during slag cooling was analyzed by X-ray diffraction and scanning electron microscopy. The relationship between viscosity and melting point and the content of precipitated phase in the cooling process was calculated and compared with the experimental results.The results show that the increase of MgO content will lead to the increase of the melting temperature of the slag, When the temperature changes, there will be a turning point of the sudden increase in viscosity. When the temperature is above the turning point, the viscosity of the slag changes little with the content of MgO, and the temperature at the turning point increases with the increase of MgO content. The solution of olivine phase and Fe3O4 spinel phase, MgO content increases can promote the olivine phase precipitation, melt viscosity increase is mainly due to the olivine precipitation.