低品位高岭土制备莫来石的研究  

Preparation of Mullite from Low-grade Kaolin

作　　者：周华梅[1] 乔秀臣[1] 于建国[2] 

机构地区：[1]华东理工大学资源与环境工程学院,上海200237 [2]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《武汉理工大学学报》2011年第3期121-125,共5页Journal of Wuhan University of Technology

基　　金：国家863项目(2007AA06Z128)

摘　　要：以苏州低品位高岭土为原料,分别研究了直接煅烧和添加氢氧化铝煅烧制备3∶2型莫来石。通过XRF、DTA、XRD、IR等测试手段,研究了样品分别经1 000~1 500℃煅烧1 h后的相转变过程。结果表明：高岭土直接煅烧在1 500℃可生成不含方石英的3∶2型莫来石产品。添加Al（OH）3可以降低3∶2型莫来石的合成温度至1 300℃,但结晶度较低,提高煅烧温度虽然可提高结晶度,但刚玉相的出现降低了莫来石的氧化铝含量。This research investigated the preparation of mullite with an Al2O3∶SiO2 ratio of 3∶2 from Suzhou low-grade kaolin by direct calcination and the calcination with the addition of Al（OH）3.The phase transformations of samples calcined between 1 000 ℃ and 1 500 ℃ for an hour were investigated using XRF,DTA,XRD and IR measurements.The results showed that a 3∶2 type mullite without the presence of cristobalite was formed in kaolin calcined at 1 500 ℃.The formation temperature of mullite was lowered down to 1 300 ℃ after adding Al（OH）3,however,the crystalline degree of mullite formed was lower.Although the increase in calcination temperature can increase the crystalline degree of mullite,the alumina content of mullite decreased due to the formation of corundum.

关 键 词：高岭土 氢氧化铝 莫来石 白云母 煅烧 

分 类 号：P574[天文地球—矿物学] P578[天文地球—地质学]