关键词: 磷酸镁水泥, 水化和缓凝机理, 磷酸镁铵

Abstract: Raw materials and processing technics for preparation of super rapid hardening magnesium phosphate cement （MPC） were reviewed.The mechanisms of hydration and retardation coagulation were also summarized in point of crystal chemistry and structure analysis of hydration product of MgNH4PO4·6H2O.The research progress and application prospect of MPC were put forward.It pointed out that since the advent of MPC，for many technologies involving commercial secrets，a lot of basic research did not go far enough，especially the hydration mechanism and the hydration products have been contradic- tory.Using chemical raw materials will cause more cost on the high side.The released of ammonia in the process of hydration reaction will cause air pollution.At the same time，China’s research reported less，and application fields were also limited.Those above factors restricted the development of production and application of MPC in large scale.Hence，in the basic theory research of MPC at the same time，it still needs to expand the application fields，especially seeking cheap mineral and rock materials or industrial waste as a substitute of chemical raw materials，（such as magnesite replace magnesium salts，like light magnesium carbonate，etc.） or industrial fillings，and this is the key to large scale production and application of MPC.

Key words: Magnesium phosphate cement；Hydration and retardation mechanism；MgNH4PO4·, 6H2O