Separation Engineering
Removal Behavior of Phosphate from Solution Using Calcination Products of CaCO3–Al(OH)3 Mixture
2014 Volume 47 Issue 3 Pages 248-253
Details
2014 Volume 47 Issue 3 Pages 248-253
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.
