HYDROXYAPATITE IS REGARDED AS ATTRACTIVE BIOMEDICAL MATERIALS FOR BONE IMPLANT APPLICATIONS DUE TO THEIR EXCELLENT BIOACTIVITIES. IN THIS INVENTION WE HAVE SUCCEEDED IN PRODUCING HYDROXYAPATITE POWDER BY USING EGGSHELL WASTE AS THE RAW MATERIAL. THE PROCESS INVOLVED DRYING AND THERMAL DECOMPOSITION OF EGGSHELL INTO CALCIUM OXIDE FOLLOWED BY HYDROTHERMAL REACTION AT A TEMPERATURE OF AS LOW AS 900C, WITH DI- AMMONIUM HYDROGEN PHOSPHATE AND WATER. THE PRODUCED HYDROXYAPATITE POWDER IS EXTRAORDINARILY FINE WITH NANO SIZE PRIMARY PARTICLES. ITS HIGH PURITY PROVED THAT THE PRODUCT FULFILLS MEDICAL REQUIREMENT. THE PRESENT INVENTION PROVIDES AN ENVIRONMENTALLY BENEFICIAL AND COST EFFECTIVE METHOD OF PRODUCING MEDICAL GRADE HYDROXYAPATITE MATERIALS UTILIZING EGGSHELL WASTE.
