结晶器保护渣渣膜结构的模拟研究

Study on Microstructure of Slag Film for Mold Fluxes

通过获得现场不同位置及由结晶器渣膜热流模拟仪获得不同时刻的渣膜,对比分析了渣膜的厚度、结晶率、晶体的分布、大小、类型.结果表明,结晶器渣膜热流模拟仪铜探头浸入45s时获得的实验室渣膜与现场弯月面附近45s的现场渣膜厚度和结晶率相当;现场渣膜随位置在晶体分布上演变规律与实验室渣膜随时间的演变类似;现场渣膜与实验室渣膜的晶体的类型相同,但是晶体大小还存在差异.因此,可以通过结晶器渣膜热流模拟仪方便、有效的模拟实际结晶器内保护渣渣膜的结晶行为.

Slag films obtained from a plant and heat flux simulator of mold slag film in different times were analyzed on the properties such as thickness,type and distribution of crystals,and particle size of crystals.The results show that the thickness and crystallization rate of slag film obtained from the heat flux simulator of mold slag film in 45 s immerse time of copper probe are similar to those obtained in the plant near meniscus.Crystal distribution of slag film obtained from the plant evolving with position is similar to that from laboratory evolving with time.Solid slag film obtained from the plant and laboratory has coincidental type of crystals,but the crystal size is different.Therefore,we can through the heat flux simulator of mold slag film simulate the practical crystallization behavior of slag film in the mould conveniently and efficiently.