摘要
方镁石–铁铝尖晶石耐火材料在水泥回转窑烧成带取得良好使用效果,这与其高温下同水泥熟料之间的反应行为密不可分。利用扫描电子显微镜、X射线衍射仪与Factsage模拟等手段研究了镁砂和铁铝尖晶石颗粒以及方镁石–铁铝尖晶石砖高温下与水泥熟料的作用行为。结果表明:镁砂具有优异的抗水泥熟料侵蚀性能,铁铝尖晶石与水泥熟料高温反应生成大量高温液相,并逐渐被蚕蚀。对于方镁石–铁铝尖晶石砖,方镁石物相和铁铝尖晶石颗粒高温下抵抗水泥熟料侵蚀表现出协同作用。以方镁石为主晶相的基质与水泥物料反应生成高熔点物相,在晶界相内形成骨架结构,提高了晶界相的高温粘度,促进了水泥熟料与耐火材料的结合。同时,铁铝尖晶石与方镁石之间的离子交换促进了铁铝尖晶石颗粒与方镁石基质的结合,抑制了高温下与水泥物料反应时长石类低熔点相的产生,提高了铁铝尖晶石的高温稳定性,有利于该类耐火砖在烧成带使用时窑皮的稳定。
Periclase–hercynite refractories are used in the firing zone of the cement rotary kiln,which is inextricably linked to their reaction behavior with cement clinker at high temperatures.In this paper,the corrosion behavior of magnesia aggregate and hercynite aggregate as well as periclase–hercynite refractory with cement clinker at high temperatures was investigated by scanning electron microscopy,X-ray diffraction,and Factsage simulation,respectively.The results show that magnesia particles have a superior corrosion-resistance to cement clinker,and the reaction of hercynite with cement clinker produces massive high-temperature liquid phase,which is gradually corroded.The periclase phase and hercynite particles have a synergistic effect on resisting the cement clinker corrosion in periclase–hercynite bricks at high temperatures.The periclase matrix as a major crystalline phase reacts with cement to generate a high melting point phase,forming a skeletal structure in the grain boundary phase,improving the grain boundary phase’s high-temperature viscosity,and promoting the combination of clinker and refractory.Also,ion exchange between hercynite and magnesia promotes the combination of hercynite and matrix,while inhibiting the formation of low melting point feldspar phases at high temperatures.Furthermore,the high-temperature stability of hercynite is improved,which benefits the kiln coating stability when using the refractory in the firing zone.
作者
刘宇驰
尹洪峰
辛亚楼
汤云
左斌
袁蝴蝶
LIU Yuchi;YIN Hongfeng;XIN Yalou;TANG Yun;ZUO Bin;YUAN Hudie(College of Materials Science and Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2023年第3期641-648,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51572213)。
