Study On Rheological Characteristics And Foaming Behavior Of Blast Furnace Slag Bearing Titania

In the process of iron making with pure V-Ti magnetite ores in Panzhihua Iron& Steel (Group) Co.(Pan-steel), the mass percent of TiO₂ can reach 27³0%, and the subsequent problems are coming. Actually, via the control of composition of BF slag to make sure the TiO₂ in 23²4%, and higher the oxygen potential in high temperature to prevent the over-reduced of TiO₂, and smooth the iron making process. Although the Pan-steel iron making is in a high level now, there is still a problem of low recovery rate of V resources. In lab-scale, the primary research on rheological characteristics and foaming behaviors of high-titanium BF slag has been studied in this paper, which is also a theroy basis for an excellent technical and economic target with pure V-Ti magnetite ores.On the basis of Pan-steel slag, 16 kinds of slag samples are designed with orthogonal design table L₁₆(4⁴) in the consideration of five factors affecting on slag properites, CaO, SiO₂, MgO, TiO₂ and MnO are included. There are two group experiments. The first group is to measure the viscosity of slag samples at 8 r/min, 12 r/min, 16 r/min, 20r/min and 1500℃with gear-viscosimeter. According to different rotational speed, different rate of shear is obtained, then, using formulaη_a =Ï„_i/D_i andη_a,Ï„_i is gained. Based on D andÏ„values,Ï„-D curves of slag samples are plotted, and constitutive equations of slag samples are achieved. On the basis of n, the rheological characteristic of slag can be known, and the effect of slag composition on the rheological characteristic can be got by the way of intuitionistic analysis. On the corner of constitutive equations of the slag samples in the experiment, n is lower than 1, and slag belongs to pseudoplastic non-Newton fluid, so the former measurement which took the high-Ti slag as Newton fluid is wrong, and the corresponding results can't stand for the non-Newton fluid. Among the factors which affect on rheological characteristics of slag, with the value of n, binary basicity is the first one, MgO and TiO₂ are the second, and MnO is the last one. The second group experiment is to make sure the rotative speed 12r/min, and measure the viscosity of slag at the temperature of 1450℃, 1475℃, 1500℃and 1525℃. The viscosity-temperature curves can be got and the viscous flow activition energy can be calculated by Arrhenius equation. After the...