EFFECT OF BINARY ALKALINITY ON VISCOSITY TEMPERATURE CHARACTERISTICS AND CRYSTALLIZATION PROCESS OF HIGH TITANIUM SLAG
In order to solve a series of problems such as slag viscosity and iron strip in slag caused by blast furnace smelting of vanadium titanomagnetite in our nation,the influence of the change of binary alkalinity of high-titanium blast furnace slag on the viscosity temperature characteristics and crystallization process of high-titanium blast furnace slag was calculated and analyzed by using the thermodynamic software Factsage,and the accuracy of the theoretical calculation was verified by the basic viscosity experiment of RTW melt physical properties determination system.The results show that the viscosity of high-titanium blast furnace slag is relatively small in the high temperature range above 1 500 ℃,about 0.2 Pa·s,and the viscosity of high-titanium blast furnace slag is less affected by alkalinity and temperature in this temperature range,and the viscosity of high-titanium blast furnace slag increases with the increase of alkalinity when it is in the low temperature range.Thermodynamic calculations show that the mineral phases precipitated by high-titanium blast furnace slag during the cooling process are mainly perovskite,titanium spinel,pyroxene,gross feldspar and olivine,and the binary alkalinity mainly affects the crystallization process of perovskite and titanium spinel.In order to ensure that the viscosity of high-titanium blast furnace slag in the smelting production process meets the production demand,the smelting temperature should be controlled above 1 400 ℃ in the actual smelting process,and when the mass fraction of TiO2 in the slag is 23％and MgO/Al2O3 is 0.6,the binary alkalinity of high-titanium blast furnace slag should be controlled to be 1.0 to 1.1.
high titanium slagviscositycrystallizationFactsage
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