Effect of MgO/Al[sub.2]O[sub.3] on Viscosity and Thermodynamic Properties of High-Titanium Slag Containing Chlorine

In order to study the effect of the change of MgO/Al[sub.2]O[sub.3] on the viscosity and thermodynamic properties of the chlorinated blast-furnace slag, the CaO-SiO[sub.2]-MgO-Al[sub.2]O[sub.3]-TiO[sub.2]-CaCl[sub.2] slag system was taken as the research object, and the viscosity change rule of the chlorinated high-titanium slag was studied by using the rotating cylinder method. The thermal stability of the chlorinated high-titanium slag was quantitatively analyzed by calculating the extreme heat release rate (EHRS) of the chlorinated high-titanium slag. At the same time, the qualitative and quantitative analysis of the high-titanium slag containing chlorine was carried out by combining FTIR and Raman spectroscopy, and the mechanism of the influence of MgO/Al[sub.2]O[sub.3] on the viscous flow characteristics of the high-titanium slag containing chlorine was revealed. The results show that when the alkalinity (R[sub.2]) of the fixed slag is 1.15, when MgO/Al[sub.2]O[sub.3] is in the range of 0.40-0.66, the viscosity of the high-titanium slag containing chlorine presents a significant decreasing trend with the gradual increase of MgO/Al[sub.2]O[sub.3], and the viscous flow activation energy of the slag decreases from 98.75kJ · mol[sup.−1] to 95.21kJ · mol[sup.−1]. The heat capacity and enthalpy change of slag decrease with the increase of MgO/Al[sub.2]O[sub.3], but the change rule of slag extreme heat release is opposite to that of heat capacity and enthalpy change. When MgO/Al[sub.2]O[sub.3] increases, the slag extreme heat release increases from 13.413 kJ to 15.172 kJ. The content of simple structural units Q[sup.0] and Q[sup.1] of silicate tetrahedron in the slag gradually increases, the content of complex structural units Q[sup.2] and Q[sup.3] gradually decreases, and the average amount of non-bridging oxygen decreases from 1.94 to 1.79, indicating that Al[sub.2]O[sub.3] acts as a network maker in the internal network structure of the slag. The increase of MgO/Al[sub.2]O[sub.3] destroys the complex silicate tetrahedron structure in the slag, reducing the degree of polymerization of the slag silicate network. In addition, the transmissivity of [SiO[sub.4]][sup.4−] tetrahedron, [AlO[sub.4]][sup.4−] tetrahedron and T-O-T bond bending vibration band in the slag shows a decreasing trend. Within the scope of the experiment, the increase of MgO/Al[sub.2]O[sub.3] can effectively improve the fluidity of the chlorine-containing blast-furnace slag and improve the