| 摘要 |
PURPOSE:To obtain the titled compound having a desired Ca/P ratio in a short time in good reproducibility, by adding CaO and/or Ca(OH)2 to slurry of CaHPO4.2H2O and water to give a solid reaction product, and heating it. CONSTITUTION:CaO And/or Ca(OH)2 is gradually added to and reacted with slurry of CaHPO4.2H2O and water while keeping pH<=10, temperature at 5-70 deg.C optionally in an inert gas atmosphere such as N2, etc. until it reaches 80wt% theoretical amount added, and the rest of CaO and/or Ca(OH)2 is added to the reaction mixture, a solid reaction product is filtered and separated. The separated solid product is heated at >=100 deg.C until water content becomes <=5wt%, to give easily high-purity hydroxy apatite having 1.48-1.67 Ca/P ratio.
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