中间包镁质干式工作衬残衬分析

Corrosion mechanism of the magnesia-based dry vibration mix for tundish working lining

为了探讨中间包熔渣对中间包镁质干式振动料的侵蚀机理,采用化学分析、SEM、EDS、XRD等手段对现场使用40h后的中间包镁质干式工作衬残衬各层的化学组成、显微结构和相组成进行了分析。结果表明在中间包使用过程中,熔渣对中间包工作衬进行渗透;在渗透的同时,熔渣对干式料产生化学侵蚀,干式料对熔渣产生化学过滤作用,方镁石溶于熔渣,都提高了熔渣的熔点和粘度,在干式振动料-熔渣界面形成致密的结构,阻碍熔渣的进一步渗透;此后,熔渣对干式料侵蚀的主要途径是对界面致密层的溶蚀。

The corrosion mechanism of slag to the magnesia-based dry vibration mix for tundi/sh working lining was studied by chemical analysis,SEM, EDS,XRD methods,analyzing the chemical composition of the layers, microstructure and phase composition of the worn tundish working lining after using 40 h. The result showed that^while performing,the tundish working lining was penetrated by slags and meanwhile,corro- ded by the molten slag. The dry vibration mix exerted chemical filtration to the molten slag and the peri- clase dissolved into the slag to improve the melting point and viscosity of the molten slag,forming a dense structure at the interface of dry mix and slag, as a result,further penetration was retarded. Afterwards,the corrosion of molten slag affects mainly the dense layer at the interface.