Effect of TiO2 on viscosity and thermodynamic properties of chlorine-containing blast furnace slag
In order to investigate the effect of changes in TiO2 content on the viscosity characteristics of chlorine containing blast furnace slag,the CaO-SiO2-Al2 O3-MgO-CaCl2-TiO2 slag system was used as the research object.The variation law of viscosity in chlorine-containing blast furnace slag was studied by using the rotating cylinder method,and the thermal stability of chlorine-containing blast furnace slag was quantitatively analyzed based on the magnitude of slag maximum extreme heat release(EHRS).At the same time,combining the results of Fourier transform infrared spectroscopy(FTIR)and Raman spectroscopy(RS)analysis,the influence mechanism of TiO2 on the microstructure evolution of chlorine containing blast furnace slag was revealed.The results show that as the TiO2 content increases,the slag viscosity decreases;the specific heat capacity and enthalpy change of slag show a decreasing trend,but the change pattern of EHRS is opposite.When the TiO2 mass fraction increases to 5％,EHRS increases from 13.413 kJ to 15.172 kJ,indicating an improvement in the thermal stability of the slag.Meanwhile,the content of simple structure units Q0 and Q1 increase,while the content of complex structure units Q2 and Q3 gradually decrease.TiO2 disrupts the complex silicate tetrahedral structure inside the slag,thereby reducing the degree of silicate network polymerization.
chlorine-containing blast furnace slagviscosityextreme heat release of slagslag structure
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