Effect of MnO on the Fluidity and Thermodynamic Behavior s of Low Magnesium Titaniferous Slag

In order to analyze the effect of MnO on viscosity of slags under the conditions of titanium ore retaining furnace and manganese ore washing furnace,the low magnesium titaniferous slags had been used as basic slag system.The relationship between MnO content and slags viscosity,melting temperature,activity and so on under different temperatures were studied through experiments and Factsage calculations,respectively.The results show that viscosity,initial melting temperature and complete melting temperature decrease with the increase of MnO content under the experimental conditions.When the content of MnO is more than 1.5%,its effect of reducing viscosity of slags is weakened.In the process of slags cooling,the melilite is the main precipitated phase and the first precipitation from slags.Increasing MnO content helps to increase the fraction of liquid phase and inhibit the formation of phase having a relatively high melting point,thereby improving slags fluidity.At the same time,the enthalpy of slags increases with the increase of MnO content.The fraction of solid phase and specific heat capacity as well as the structure of liquid slags are the main factors affecting the enthalpy changing.In addition,the activity of MnO and TiO₂ in liquid slags showed the opposite trend with the increase of MnO content.The increase of MnO activity and the decrease of TiO₂ activity further reflect that MnO can simplify the structure of the slags.