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1 Polish Journal of Chemical Technology

1 2005

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Jet pump crystallizers in the reaction crystallization processes of sparingly soluble salts

Matynia A., Koralewska J., Wierzbowska B., Piotrowski K.

Polish Journal of Chemical Technology

2005

Vol. 7, nr 3

56-63

The research results concerning the reaction crystallization processes of hydroxyapatite (HAP) and struvite (MAP) in the two flow jet pump DTM crystallizers with the internal circulation of the suspension are presented. Calcium or/and magnesium ions precipitation from the diluted water solutions was taken into effect by the addition of ammonium dihydrogenphosphate NH4H2PO4 solution in the alkali environment (T = 298 K, pH = 9, t = 900 s). The influence of calcium (0.1 - 1.5 mass %) and magnesium (0.1 - 2.0 mass %) ions concentration in the feeding stream on the resulting product crystal size distribution was investigated. The test results can be utilized in the improvement of the jet pump DTM crystallizers design. This construction is especially recommended for the precipitation of the calcium or/and magnesium ions, as well as the phosphate(V) ions from the diluted solutions or the liquid wastes.