Preparation of calcium phosphate with corbicula shells

Abstract

Corbicula shells have received attention for use as a calcium resource. For this study, calcium phosphate was prepared from phosphoric acid and corbicula shells. The obtained precipitates were a mixture of calcium hydrogen phosphate dihydrate and unreacted calcium carbonate. When heated corbicula shells were used as a calcium resource, as high a yield of CaHPO₄ × H₂O was obtained as when commercially produced calcium carbonate was used as a calcium resource. The phosphoric acid concentration influences the Ca/P ratio of precipitates. The obtained phosphate materials functioned well as an adsorbent for basic malodorous gas. Corbicula shells are not garbage. They present the possibility of use as a calcium resource.