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为明确TiO_2对京唐炉渣性能的影响机理,基于京唐高炉渣的实际成分,通过黏度试验研究了TiO_2对炉渣黏度及熔化性温度的影响;同时利用FactSage热力学软件,计算了不同TiO_2质量分数炉渣的活度、熔化温度,液相区以及炉渣从1500冷却到1000℃时的物相变化。试验结果表明,炉渣的黏度和熔化性温度随着渣中TiO_2质量分数的增加而降低。FactSage计算表明,炉渣中TiO_2活度增大,炉渣的黏度随之减小;TiO_2增多有利于降低炉渣的熔化温度和扩大液相区,但当w(TiO_2)由4.2%变化到5.6%时,炉渣的液相区反而在CaO区域缩小;炉渣结晶相的变化表明渣中TiO_2不宜过多,否则在高温时就容易生成钙钛矿相,从而增大炉渣的黏度,不利于高炉顺行。为满足京唐高炉冶炼对炉渣性能的要求及护炉的需要,炉渣中w(TiO_2)应控制在5.0%以内。
In order to clarify the mechanism of the effect of TiO_2 on the properties of Jingtang slag, the influence of TiO_2 on the viscosity and melting temperature of slag was studied by viscosity test based on the actual composition of Jingtang blast furnace slag. Meanwhile, with the help of FactSage thermodynamic software, , The melting temperature, the liquid zone, and the phase change of slag when cooled from 1500 to 1000 ° C. The experimental results show that the viscosity and melting temperature of the slag decrease with the increase of the mass fraction of TiO_2 in the slag. FactSage calculation shows that the activity of TiO_2 in slag increases and the viscosity of slag decreases. The increase of TiO_2 is helpful to reduce the melting temperature of slag and expand the liquid region. However, when w (TiO_2) is changed from 4.2% to 5.6% However, the liquid phase of the slag is reduced in the CaO region. The change of the crystalline phase of the slag shows that the TiO_2 in the slag should not be too high, otherwise the perovskite phase is easily formed at high temperature, which increases the viscosity of the slag and is not conducive to blast furnace operation. In order to meet the requirements of Jingtang blast furnace smelting on slag performance and the need of protecting the furnace, w (TiO_2) should be controlled within 5.0%.