煤系高岭土高温煅烧单晶相莫来石产品的工艺条件

摘要

研究了煤系高岭土高温煅烧生成单晶相莫来石产品的工艺条件-煅烧温度、保温时间和物料粒度.结果表明:煤系高岭土经1 530℃保温8 h或者1 550℃保温0.5～3 h煅烧后均可以获得单晶相莫来石产品,且粒度对单晶相产品的获得没有大的影响;在1 550℃煅烧时,随保温时间的延长,莫来石晶粒长大,玻璃相从连续的网络结构变成不连续的网络结构.%High temperature calcining process of coal series kaolin preparing single crystal mullite was researched,such as calcining temperature, soaking time, and particle size of starting material. The results show that single crystal mullite can be obtained after calcining coal series kaolin at 1 530 ℃ for 8 h or 1 550 ℃ for 0.53 h,and the particle size of kaolin has no obviously influence on the product;when calcining at 1 550 ℃,as soaking time prolongs, the crystal grain grows, glass phase turns from continuous network to discrete network.