The castables for hot metal ladle edge were prepared using recycled bauxite castables( w( Al2O3 ) ≥65％ ) used in desulphurization lance and grade three bauxite clinker powder as main starting materials,recycled steel fiber as reinforcement and flexibilizer, bauxite cement, SiO2 micropowder, and α-Al2O3 micropowder as complex binders, disthene as high temperature expanding agent, recycled aluminium silicate fiber (length 3-8 mm) as anti-explosion agent. Formulations with 70％ recycled castables and different particle size compositions were designed and optimized according to the anti-explosion ability of castables after rapid demoulding and drying. The results of physical properties and petrographic analysis show that the prepared castables has the moderate density, relatively high strength, and proper microstructure,strengthening the compatibility of castables to rapid drying,enhancing the insulating properties and anti-failure ability. The production application shows the castables can not only decrease the repairing cost of the desulphurization hot metal ladle, but also prolong the average one-time-casting-service life of working lining for bauxite brick hot metal ladle edge from 300 to 845 times.%采用w(Al2O3)≥65%的铁水脱硫喷枪用高铝质浇注料的再生料和三级高铝矾土熟料粉为主要原料,再生钢纤维为增强增韧材料,矾土水泥、SiO2微粉和α-Al2O3微粉为复合结合剂,蓝晶石为高温膨胀剂,用后硅酸铝纤维再生料(纤维长度3～8 mm)为防爆剂,设计了再生料加入质量分数约70%,粒度级配不同的铁水罐罐沿浇注料配方,并根据浇注料试样脱模后快速烘烤的抗爆裂性对配方进行了优化,然后进行了实际应用试验.理化性能检测和岩相分析结果表明:所研制的浇注料致密度适中,强度较高,微观结构合理,增强了浇注料对快速烘烤的适应性,提高了工作衬的保温隔热性能和抗破损能力;实际生产应用表明,该浇注料不仅降低了脱硫铁水罐的维护成本,而且使高铝砖脱硫铁水罐罐沿工作衬1次浇注平均使用寿命由300罐次延长到845罐次.
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