Effects of MgO, Na2O, and B2O3 on the Viscosity and Structure of Cr2O3-bearing CaO-SiO2-Al2O3 Slags
Effects of MgO, Na2O, and B2O3 on the Viscosity and Structure of Cr2O3-bearing CaO-SiO2-Al2O3 Slags
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DOI：
10.2355/isijinternational.isijint-2016-569
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发表时间：
2017-04
影响因子：
1.8
通讯作者：
Qiuhan Li;Shu-feng Yang;Yan-ling Zhang;Zhuoqing An;Zhancheng Guo
中科院分区：
文献类型：
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作者：
Qiuhan Li;Shu-feng Yang;Yan-ling Zhang;Zhuoqing An;Zhancheng Guo
采用旋转圆筒法研究了MgO、Na 2 O和B 2 O3对含Cr2 O3的CaO-SiO 2 -Al 2 O3渣系粘度的影响。利用拉曼光谱获得了不同MgO、Na 2 O和B 2 O3含量炉渣的结构信息.含Cr2 O3的CaO-SiO2-Al 2 O3- MgO渣系的粘度随Cr2 O3的加入而增加。含Cr2 O3的CaO-SiO2-Al 2 O3渣系的粘度和活化能（E μ）随MgO、Na 2 O和B 2 O3含量的增加而降低. MgO和B 2 O3对含Cr2 O3的CaO-SiO2-Al 2 O3渣系的粘度和活化能（E μ）的影响大于Na 2 O。这可能是由于这些添加剂改变炉渣网络结构的方式不同。拉曼光谱分析表明，MgO和Na 2 O起着网络改性剂的作用，MgO和Na 2 O的加入使熔渣的聚合度（DOP）增加。MgO比Na 2 O更能有效地改变结构，因为Na 2 O更容易形成网状结构[AlO 4 ]单元。在本研究中，发现Cr 2 O 3和B 2 O 3具有网络形成剂的作用，并能提高DOP.其特征在于NBO/Si（每个Si原子的非桥接氧的数目）值的降低。B 2 O 3的加入导致低熔点共晶的形成和较弱的聚合强度，有助于降低炉渣粘度。
The influence of MgO, Na 2 O, and B 2 O 3 on the viscosity of Cr 2 O 3 bearing CaO–SiO 2 –Al 2 O 3 slags was investigated using the rotating cylinder method. Structural information of slags with different MgO, Na 2 O, and B 2 O 3 content was obtained via Raman spectroscopy. The viscosity of Cr 2 O 3 bearing CaO–SiO 2 –Al 2 O 3 – MgO slags increases with Cr 2 O 3 addition. The viscosity and activation energy (E μ ) of Cr 2 O 3 bearing CaO– SiO 2 –Al 2 O 3 slags decreases with increased MgO, Na 2 O, and B 2 O 3 content. The effect of MgO and B 2 O 3 on viscosity and activation energy (E μ ) of Cr 2 O 3 bearing CaO–SiO 2 –Al 2 O 3 slags was greater than that of Na 2 O. This could be due to the different ways in which these additives modify the slag network structure. Raman spectroscopy analysis revealed that MgO and Na 2 O work as network modifiers, and the degree of polymerization (DOP) of slags increases with the addition of MgO and Na 2 O. MgO is more effective at modifying the structure than Na 2 O, because Na 2 O may be more likely to produce network former [AlO 4 ] units. In this study, Cr 2 O 3 and B 2 O 3 are found to behave as network formers and increase the DOP. This is characterized by the decrease in NBO/Si (the number of non-bridging oxygen per Si atom) value. B 2 O 3 addition leads to the formation of low melting point eutectics and weaker polymerization strength, which contribute to the decrease in slag viscosity.