机械搅拌脱硫过程铁水包喷溅机理

 KR采用机械搅拌方式脱硫，不仅脱硫效率高、脱硫剂消耗少，而且处理过程无外来气体吹入，很少发生喷溅 。介绍了一种由内生CO引起的KR过程铁水喷溅现象，研究并论证了喷溅过程的发生机理。研究认为，铁水包内剩余铁或铁氧化物，经过长时间高温烘烤、保温，转化为FeO； FeO熔化或与铁水中硅反应成低密度的液态铁橄榄石；生成物上浮过程中，在铁水包内一定深度又与铁水中碳反应生成CO。当搅拌发生时，铁水运动加剧CO的生成速度，进而引起铁水喷溅。高碳、低硅、高温铁水容易发生喷溅。为防止喷溅，应制定铁水包烘烤时间的规范上限。如果铁水包出现“冒火”、“液面涌动”等信号，应谨慎处理或停止处理。

Theoretical Analysis for Splashing in Iron Ladle of Mechanical Stirring Desulphurization Process

KR processes desulphurization more efficiently and less consumptivey with mechanical stirring. Hot metal splashes from KR ladle without blow-in gases. An example of CO splashing in KR process is involved, trying to find out why and how it happens. It is revealed that the residual iron and ferrite will turn into ferrous oxide after long-term hot baking. Ferrous oxide would be melt or turn into liquid fayalite after reacting with silicon in hot metal. The drops would float up and react with carbon in hot metal at some depth, generating carbon oxide. These reactions would be fastened after stirring, resulting in splashing. Higher temperature, more carbon and less silicon in hot iron, more heavily it splashes. To preventing splashing, time upper limit should be carried out when baking. “Belch” or “surface rolling” is a significant signal before splashing, pay more attention or stop operation.