Abstract: It summarized the iron element occurrence state in kaolin,introduced the fundamental and research progress of deironing and whitening methods,and indicated that the iron element occurrence state in kaolin is the intrinsic factor of deciding whitening methods.Only adopting polytechnic deironing combination methods,the better deironing effects can be obtained.

Key words: Kaolin, Deironing and whitening, Physical method, Chemical method, Microbiological method