Abstract: STUDIES OF BEHAVIOR OF FORMING INTERFACIAL CRUD OF ZIRCONIUM WITH HDBPZHANG CHONGHAI；LIN CANSHENG；GUO JINGRU；WANG XIAOYING；YANG ENBO（China Institute of Atomic Energy，P.O.Box 275（26），Beijing 102413）ABSTRACT The behavior of interfacial crud formed by zirconium and HDBP in the system of 30％TBP／n-dodecane-HNO_3 is reported．The conditions in which the interfacial crud is formed with zirco-nium and HDBP are investigated．The major components of the solid residue of interfacial crudare analyzed and the abnormal phenomenon which occurs in forming interfacial crud is explored.The possible mechanism for this phenomenon is proposed.Key words Interfacial crud Zirconium HDBP