二元碱度对含钛高炉渣结晶过程的影响研究

Effect of Binary Basicity on Precipitation Behavior of Titnaium Bearing BF Slag

在Factsage热力学计算基础上,借助高温共聚焦显微镜进行了二元碱度对含钛高炉渣结晶行为影响的研究。热力学计算表明:在低碱度的含钛渣中,钛组分以TiO_2的形式富集,TiO_2的结晶温度约为1 160℃;高碱度时富集于钙钛矿。CSLM实验结果表明:炉渣碱度对钛组分的富集路径有影响。当1 100℃等温冷却,碱度为0.6时,二氧化钛富集于钛铈钙矿,该物相晶体呈现细小的针状,不利于后续的分离处理;当碱度为0.8时,二氧化钛富集于扁平的榍石中,该物相平均尺寸为径长250μm,但是抛磨后成不规则条状,晶体尺寸仍然很小,与其他物相共生。

Based on thermaldynamics caculation,effect of binary basicity on precipitation behavior was accompolished by conforcal scanning laser microscope. The results of the thermaldynamic caclulation show that TiO2 precipitates firstly from the slag when binary basicity is low. The temperature of precipitation is about 1 160 ℃. Titania enters CaTiO3 when binary basicity is high.The results of CSLM experiments show that Titania enters CaTi（21）O（38）,which is fine acicular,when binary basicity is 0. 6 at 1 100 ℃. Titania enrichs in CaTiSiO5 about 250 μm associated with otherphases. When basicity is 0. 8,titanium dioxide gathers in tabular sphene which is usually has the path length of 250μm but becomes anomaly shape after being rubbed down,and still has very small crystal size and intergrowths with others.