It can be seen from this study that avoiding a hardened and impervious lump formed in calcination can accelerate Al extraction from coarse metakaolin pellets,and a high leaching rate can be reached within a batch process.

• 该研究结果表明，避免高岭土球粒在煅烧时被“烧死”，能使粗粒煅烧高岭土的酸溶反应易于进行。