中性气氛下高铝中钛型高炉渣黏度的试验研究

Experimental Study on Viscosity of Blast Furnace Slag With Medium Titania and High Alumina Content Under Neutral Atmosphere

采用RTW熔体物性测定仪研究了中性气氛条件下高铝中钛型高炉渣的黏度和熔化性温度,得到了碱度和化学成分等因素对其黏度和熔化性温度的影响规律。结果表明:在中性气氛条件下,当炉渣碱度从0.92提高到1.12时,炉渣的黏度降低、熔化性温度升高;随着渣中MgO含量的升高,炉渣的黏度先降低再升高;增加渣中Al2O3含量,炉渣的黏度显著提高。当Al2O3的质量分数大于14.75%后对炉渣黏度的影响不明显;当TiO2的质量分数在10.57%～14.57%范围内增加时,高铝中钛渣的黏度随之降低,即在理想条件下,TiO2含量和温度的增加对炉渣黏度影响均不大。但当高炉冶炼钒钛磁铁矿时,炉渣中的Ti(C,N)等高熔点物质随原料中TiO2含量的增加和炉温的上升而增加,将对炉渣黏度产生很大的影响,故冶炼时应控制高炉内TiO2的还原以少生成高熔点钛化合物,并且严格控制铁水温度以使高炉接受矿石钛含量。

The viscosity and smelting temperature of blast furnce slag with medium titania and high alumina content were studied under neutral atmoshphere using RTW type of melt physical determinator. The influence of basicity and chemical compositions on slag viscosity and melting temperature were obtained. The results show under neutral atmosphere, the viscosity reduces and the melting temperature rises with the increase of the basicity of slag from 0.92 to 1.12. When the MgO content in slag is increased, the viscosity of slag decreases firstly and then increases. The viscosity of slag rises significantly with increasing the Al2O3 content in slag. When the A1203 content is more than 14.75%, the effect of Al2O3 content on the slag viscosity is not obvious. The viscosity reduces with increasing the TiO2 content from 10.57%-14. 57%. Namely, the increase of TiO2 content and temperature insignificantly influ ences the slag viscosity. But when the vanadium-titanium iron ore is smelted in the BF, the Ti（C,N） content rises with increasing TiO2 content of the raw materials and temperature of liquid iron, which effects the slag viscosity sig nificantly. Therefore, it should control the reduction of TiO2 in blast furnace in order to reduce the formation of titanium compound with high melting point, and the liquid iron temperature should be controlled strictly to make the BF smelt iron ore with high titanium content.