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has been cited by the following article:

• TITLE: Preparation of Calcium Phosphate with Oyster Shells

  AUTHORS: Hiroaki Onoda, Hironari Nakanishi

  KEYWORDS: Calcium Phosphate; Oyster Shells; Calcium Carbonate; Yield; Powder Properties

  JOURNAL NAME: Natural Resources, Vol.3 No.2, June 25, 2012

  ABSTRACT: Oyster shells have received attention for use as a calcium resource. For this study, calcium phosphate was prepared from phosphoric acid and oyster shells. The influences of the concentration of phosphoric acid and pH in the preparation conditions were studied from the yields of calcium phosphate and unreacted carbonate, and the Ca/P ratios in precipitates. The yield of calcium phosphate and carbonate was low in the preparation condition with 0.1 mol/l of phosphoric acid. The obtained precipitates were the mixture of calcium hydrogen phosphate dihydrate and the unreacted calcium carbonate. The reactivity of the oyster shells with phosphoric acid was discussed from the yields and Ca/P ratios in precipitates.