Conversion of Waste Incineration Fly Ash into Calcium Phosphates

概要

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In order to convert waste incineration fly ash (Fa) into calcium phosphates, Fa was treated with Na3PO4 solutions at 85°C for 24h and the resulting materials were characterized by various means. Powder X-ray diffraction, X-ray fluorescence and thermal analysis indicated that the Fa contains large amounts of CaCO3 and Ca(OH)2. By treating the Fa in Na3PO4 solution, CaCO3 and Ca(OH)3in the Fa were dissolved to form calcium hydroxyapatite (Ca10(PO4)6(OH)2: Hap). Adding NHO3 solution in the treating solution accelerated the dissolution of CaCO3 and Ca(OH)2 in the Fa, leading to an increase in the adsorbed amount of PO3-4 and the formation of dicalcium phosphate unhydrate (CaHPO4) and Hap. These results indicated that the calcium compounds in Fa are available for calcium source to synthesize the calcium phosphates.
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