新型纳米增强铝质耐火浇注料及预制块在回转窑煅烧带的应用

Application of new nano reinforced aluminum refractory castables and prefabricated bricks in the calcining zone of rotary kiln

采用异丙醇铝和柠檬酸镁为制备镁铝尖晶石纳米粉的前驱体,将铝质浇注料的颗粒在镁铝尖晶石先驱体的溶胶中浸渍,浸渍处理后的颗粒经过热处理得到附着有纳米镁铝尖晶石粉的铝质浇注料颗粒原料。包覆有镁铝尖晶石的颗粒对制备高强度铝质浇注料及其预制块起着关键作用。同时,要根据材料的导热系数,合理地设计并砌筑石灰回转窑高温煅烧带窑衬。此种新型纳米增强浇注料及预制块,经现场使用,延长了石灰回转窑煅烧带窑衬的使用寿命,降低了窑体热损失。

Aluminum isopropoxide and magnesium citrate are used as precursors to prepare nano alumina-magnesia spinel powder.The aluminum castable particles are impregnated in the sol of alumina-magnesia spinel precursors.The impregnated particles are processed to obtain aluminum castable particles attached with nano alumina-magnesia spinel powder.The particles attached with alumina-magnesia spinel play a crucial role in the preparation of high-strength aluminum castable and its prefabricated blocks.Besides,the lining for high-temperature calcining zone of the lime rotary kiln should be reasonably designed and built according to the thermal conductivity of materials.After using such new nano reinforced castable and prefabricated bricks,the service life of lining for the calcining zone of the lime rotary kiln has been extended and the heat loss of the kiln body has been reduced.