Removal Behavior of Phosphate from Solution Using Calcination Products of CaCO₃–Al(OH)₃ Mixture

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  • Hiraga Yuki
    Department of Chemical and Biological Technologies, Shikoku Research Institute, Inc.
  • Shigemoto Naoya
    Department of Chemical and Biological Technologies, Shikoku Research Institute, Inc.

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  • Removal Behavior of Phosphate from Solution Using Calcination Products of CaCO<sub>3</sub>–Al(OH)<sub>3</sub> Mixture

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CaCO3–Al(OH)3 mixtures were calcined at 1,273 K by varying the mixing ratio and the removal behavior of PO43− from solution was examined. The calcination products of CaCO3 mixed with a small amount of Al(OH)3 (Ca/(Ca+Al)=0.85–0.91), whose major crystalline component was lime (CaO), showed higher PO43− removal than the calcination products of other CaCO3–Al(OH)3 mixtures and of CaCO3: The maximum amount of PO4 removal and the lowest concentration of the remaining PO43− in solution were 10 mmol·g−1 and 0.002 mmol·dm−3, respectively. PO43− ions were removed by the precipitation of hydroxyapatite (Ca10(PO4)6(OH)2) and the related compound, Ca8(HPO4)6(OH)4·H2O.

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