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w słowach kluczowych: hydroxyapatite (HAP)

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Pilotażowe badania kliniczne nad efektywnością elastycznego kompozytu opartego na HAp dla wypełniania ubytków kostnych

Belcarz A., Ginalska G., Polkowska I., Przekora A., Ślósarczyk A., Zima A., Paszkiewicz Z.

Engineering of Biomaterials

2010

Vol. 13, no. 99-101

16--18

The influence of the process parameters on the hydroxyapatite continuous crystallization kinetics

Matynia A., Koralewska J., Piotrowski K.

Polish Journal of Chemical Technology

2005

Vol. 7, nr 1

44-53

The results of the mass crystallization kinetics of the process of calcium ions precipitation with the use of ammonium dihydrogenphosphate NH4H2PO4 in water under alkaline conditions (pH = 9) are presented. The experiments were carried out in the continuous laboratory DTB MSMPR (Draft Tube Baffle, Mixed Suspension Mixed Product Removal) crystallizer with the internal circulation of the suspension. The influence of calcium ions concentration in the feed stream, the temperature and the residence time on the nucleation and the growth rates of hydroxyapatite crystals formed, was established. The kinetic parameters were evaluated from the crystal size distributions employing selected SDG (Size Dependent Growth) models.

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.