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通过测定熔渣升温过程中的DSC曲线,观察升温过程中发生的熔化相变温度以及熔化热焓,研究了CaO和SiO2含量对CaO-SiO2-Al2O3-MgO熔渣熔化性能的影响.结果表明,随着SiO2含量的增加,熔化过程的吸热峰向高温端偏移;在1120~1160℃范围内,存在一个由于Ca2SiO4的晶型转变而产生的明显的放热峰;相同SiO2含量下,随着CaO含量的增加,熔化温度降低,熔化温度和熔化热焓增大;相同CaO含量下,随着SiO2含量的增加,熔渣熔化温度升高,熔化区间增大.建立了熔渣熔化温度与熔渣碱度(X1),MgO含量(X2)和Al2O3含量(X3)的关系式:Τonset=1412.84-286.423X1+47.732X2+7.107X3+1.390X1X2+4.028X1X3-1.060X2X3+17.110X12+0.290X22-0.135X32,Τend=1459.212-299.011X1+44.968X2+3.647X3+3.264X1X2+5.621X1X3-0.243X2X3+9.338X12+0.522X22-0.275X32.
The effects of CaO and SiO2 content on the melting properties of CaO-SiO2-Al2O3-MgO slag were investigated by measuring the DSC curve of the slag during the heating process and observing the melting phase transition temperature and the enthalpy of fusion during the heating process. With the increase of SiO2 content, the endothermic peak of the melting process shifts to the high temperature end. In the range of 1120-1160 ℃, there is a significant exothermic peak due to the crystal transition of Ca2SiO4. With the same SiO2 content, With the increase of CaO content, the melting temperature decreases and the melting temperature and enthalpy of fusion increase. With the increase of SiO2 content, the melting temperature increases and the melting range increases with the increase of CaO content. Slag basicity (X1), MgO content (X2) and Al2O3 content (X3): Tonset = 1412.84-286.423X1 + 47.732X2 + 7.107X3 + 1.390X1X2 + 4.028X1X3-1.060X2X3 + 17.110X12 + 0.290X22 -0.135X32, and End = 1459.212-299.011X1 + 44.968X2 + 3.647X3 + 3.264X1X2 + 5.621X1X3-0.243X2X3 + 9.338X12 + 0.522X22-0.275X32.