The present work was investigated about the removal conditions of protein and powder property of low crystalline hydroxyapataite (HAp) obtained by removing protein in NaOH solution for purpose of resources recycling on HAp and protein in bovine bone. The product was characterized by means of X-ray diffraction, thermal analysis (TG-DTA), measurement of BET specific surface area, scanning electron microscopic observation, ultraviolet absorptiometry and chemical analysis.
The removal of protein in bovine bone was carried out suspension concentration of 0.5-10.0 wt% by adding the crushed bone with particle size of below 2mm in 0.1-5.0 wt% NaOH solution at 25°C and 90°C. The removal ratio of protein had a maximum amount under conditions of suspension concentration of below 3.0 wt% by adding the crushed bone in 3.0 wt% NaOH solution at 90°C for 3 hours. The pore volume of low crystalline HAp obtained by removing protein in 5.0 wt% NaOH solution at 25°C, was increased and the HAp was superior to crushability. On the other hand, the Ca/P atomic ratio in reclaimed HAp was increased by removing protein in 5.0 wt% NaOH solution at 90°C. The low crystalline HAp had a very high ion exchange capacity.

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