摘要
以煤系高岭土为主要原料,在400℃条件下,经NaOH碱熔活化2 h后,高岭土生成可溶性的硅铝酸盐及活性偏高岭石,再水热晶化得到了4A分子筛产品,并运用XRD,TDA,SEM等对原矿、预处理产物和4A沸石分子筛产品进行了检测,采用正交实验对合成工艺进行了优化。结果表明:该法能有效活化高岭土,大幅度降低煅烧活化的温度、提高原料的活性,产品为纯净的4A沸石分子筛,粒径小于2μm,Ca2+交换量大于295 mg CaCO3/g干沸石。
The coal series kaolin was used as the main material to synthesize 4A molecular sieves by hydrothermal crystallization after the kaolin turned into soluble aluminosilicate and activity metakaolin under the conditions of NaOH alkali melting at 400 ℃ for 2 h.Then the ore,the pretreated material and the 4A molecular sieves products were characterized by XRD,TDA and SEM.The technological conditions were optimized by orthogonal tests.The results showed that the methods can effectively activate the kaolin,greatly decrease the baking temperature and improve the activity of the material.The products were pure 4A molecular sieves,the particle size was less than 2 μm and the Ca2＋ exchange capacity of dry products was more than 295 mg CaCO3/g.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第2期336-340,共5页
Bulletin of the Chinese Ceramic Society
基金
贵州省六盘水市科技计划资助项目(52020-2009-01-03)
六盘水师范学院科研资助项目(LPSSY201010)
关键词
煤系高岭土
碱熔
水热晶化
4A沸石分子筛
coal series kaolin
alkali melting
hydrothermal crystallization
4A molecular sieve
