Experimental Study on the Viscosity of CaF_2-SiO_2-Al_2O_3-CaO-MgO Slag

To study the effects of CaF2-SiO2-Al2O3-CaO-MgO slag composition on viscosity,the slag samples was prepared by the method of quadratic orthogonal rotary regression.On the conditions of dropping in the temperature between 1 600 and 1 300℃,the slag viscosity was measured by the rotary cylinder method with RTW-10melt physical properties measuring apparatus.The regression calculation equation on viscosity was established according to the viscosity analysis using regression analysis method at 1 600℃,then the influence of oxide on CaF2-based refining slag viscosity was studied.The results show that the viscosity of slag declined dramatically with the increase of CaF2,and the viscosity of slag increased rapidly with the increase of SiO2,MgO and Al2O3 when the content range of CaF2is from 10%to 70%.However,with the increase of CaO,the changeable viscosity is attributed to the interaction of other components.When SiO2content is 10%,MgO content is 10%,and CaF2content is 50%,with the increase of CaO,the viscosity first increased,then decreased,and the viscosity is maxima when the CaO content is 10%.When Al2O3 content is 20%,MgO content is 10%,and CaF2content is 50%,with the increase of CaO,the viscosity first increased,then decreased at SiO2content of less 20%.On the contrary,the viscosity of slag containing more than 20% SiO2 decreased due to addition of CaO.