Abstract: In order to study the sintering mechanism and kinetics of buildings ceramics prepared from basic oxygen furnace (BOF) slag, the BOF slag with different grain sizes as the main materials were mixed with some additives to improve the properties of sintering, and ceramic tiles with good performance were made. Sintering mechanism was studied with respect to ceramic tiles samples deformation and changes of density before and after sintering, and sintering activation energy of the BOF slag ceramic tiles was calculated. Crystallization kinetics of the BOF slag ceramic tiles was studied with differential thermal analysis and scanning electron microscopy. The smaller the grain size of raw material, the easier the sintering and the lower the sintering temperature. The broad crystallization peak in the differential thermal analysis indicated surface crystallization, whereas the sharp peak indicated bulk crystallization. The current work is useful for harmless processing and recycling of the BOF slag on a large scale.

Key words: BOF slag, sintering mechanism, kinetics, waste treatment, Cr⁶⁺, environment

摘要： 为了研究转炉钢渣制备建筑陶瓷的烧结机理及动力学，以不同粒径转炉渣为主要原料，加入改善坯料烧结及制备性能的添加剂，成功地制备了高性能的陶瓷墙地砖。根据样品烧结前后变形及烧结密度的变化，初步探讨了转炉钢渣质墙地砖的烧结机理，并且计算了烧结激活能。利用差热分析和高倍电镜对样品进行了分析，研究了转炉钢渣质墙地砖结晶过程中的动力学。结果发现，原料粉末粒径越小，样品越易烧结，相应的烧结温度也越低。样品差热分析中的尖峰和宽峰分别代表了表面结晶和内部体结晶。研究表明，本工作为转炉铬渣无害化处理及大规模资源化综合利用奠定了基础。

关键词: 转炉钢渣, 烧结机理, 动力学, 废物处理, Cr⁶⁺, 环境