CaO－SiO_2－Al_2O_3－FeO熔渣起泡行为的研究

FOAMING BEHAVIOUR OF CaO-SiO_2-Al_2O_3-FeO SLAGS

在１５００℃下，用Ｘ射线透视装置研究了ＣａＯ－ＳｉＯ_２－Ａｌ_２Ｏ_３－ＦｅＯ熔渣被石墨还原过程中渣的起泡行为，测定了熔渣的起泡指数和起泡率等参数．结果表明，随熔渣碱度上升，其起泡率增大而起泡指数却下降．同时考察了ＭｇＯ，ＣａＦ_２，Ｎａ_２Ｏ等添加物对熔渣起泡行为的影响．通过对熔渣起泡指数的因次分析得到，熔渣起泡指数与熔渣粘度，密度，表面张力及重力加速度ｇ有如下关系：

The foaming behaviour of CaO-SiO_2-Al_2O_3-FeO slag system reduced by graphite at 1500℃ was quantitatively studied with the help of X-ray apparatus. Foaming parameters such as foaming ratio and foaming index were determined. It was found that with increase of the basicity of slags, the foaming ratio increased, however, the foaming index was opposite. In addition, the effects of additives like MgO, Na_2O and CaF_2 on the foaming behaviour were also investigated. The result of dimensional analysis showed that the foaming index(∑) of molten slag was determined by where μ is the viscosity of the slag,σis the surface tension, ρis the density of the slag and g is the acceleration of gravity.