钇基稀土处理钢对Al-C质耐材水口结瘤的工业实验研究

Industrial experimental study of nozzle clogging caused by A1-C refractory in smelting yttrium-based rare earth steel

针对某钢厂冶炼钇基稀土处理钢时采用Al-C质水口耐材导致的水口结瘤问题,用SEM和XRD对水口结瘤物成分进行了分析,在结瘤层及耐材与结瘤物交界处进行了扫描观察.结果表明,水口结瘤物的来源主要是钢液中稀土铝酸盐、硅酸盐等高熔点化合物的析出,和稀土钢液与耐材内衬反应的生成物,同时结合相图客观分析了Al-C质耐材在钇基稀土处理钢应用中的水口结瘤机理.

In order to deal with a steel plant＇s nozzle clogging caused by Al-C refractory in smelting yttrium- based steel with rare earth elements, the compositions of clogging materials were analyzed by SEM and XRD, and the clogging layers as well as the junction of the refractory and the clogging were scanned. The results showed that the main source of the clogging was the precipitation of high melting point compounds such as rare earth aluminates and silicates in molten steel, and the erosion of the refractory liner by mohen rare earth steel. Besides, the phase diagram was used to objectively analyze the clogging mechanism of the Al-C refractory used in yttrium-based rare earth steel.