碱度对包钢高炉渣物理性能的影响

Influence of binary basicity on physical properties of blast furnace slag of Baogang Group

为探明二元碱度对包钢高炉渣物理性能的影响机理,基于包钢7号高炉渣化学组成,添加纯试剂CaO、SiO2调整炉渣的二元碱度。通过实验研究二元碱度对包钢7号高炉渣熔化温度、黏度和熔化性温度的影响规律;同时采用Factsage7.0热力学软件,计算了不同碱度下炉渣的液相线温度和热焓值。结果表明:随着碱度升高,炉渣熔化温度不断升高,黏度和熔化性温度先降低后升高,碱度在1.1~1.3之间,碱度每提高0.1,炉渣半球温度提高4.67℃,软熔区间为3.33~4.60℃;碱度在1.1~1.4之间,1 450℃以上炉渣黏度均低于0.5 Pa·s,流动性良好;Factsage7.0计算结果表明:随着碱度的升高,炉渣的液相线温度不断升高,热焓值不断降低。综合考虑碱度对包钢炉渣熔化温度、熔化性温度、热焓和黏度的影响规律,建议包钢高炉渣的碱度应控制在1.1~1.3之间。

In order to identify influence mechanism of binary basicity on the physical properties of blast furnace slag of Baogang Group,pure reagents as CaO and SiO2 were added to adjust binary basicity of blast furnace slag based on chemical composition of No.7 blast furnace slag.The effect of binary basicity on the melting temperature,viscosity and free running temperature of No.7 blast furnace slag was studied experimentally.Meanwhile,the liquidus line temperature and enthalpy of slag under different basicity were calculated by using Factsage 7.0 thermodynamic software.The results show that with the increasing of basicity,the melting temperature of slag increase continuously,the viscosity and free running temperature first decrease and then increase,for every 0.1 increase in basicity,the hemispheric temperature of slag increases by 4.67℃and the melting range is 3.33-4.60℃;with the increasing of basicity from 1.1 to 1.3,the viscosity of slag above 1 450℃is lower than 0.5 Pa·s,and the fluidity of slag is favorable.The calculation results of Factsage 7.0 show that the liquidus temperature of slag increases and the enthalpy decreases with the increasing of basicity.Considering the influence of binary basicity on melting temperature,free running temperature,enthalpy and viscosity of Baogang Group’s blast furnace slag,it is proposed that binary basicity should be controlled between 1.1 and 1.3.