Calcium Carbonate → Tricalcium Phosphate

Participants

Reaction Steps

204 g of KH2PO4 was introduced into a receptacle containing 0.750 l of water at an ambient temperature of 20° C. After gentle stirring, 250 g of CaCO3 having an average particle size of 200 μm were introduced into the receptacle. The assembly was then stirred for 30 minutes using an Ultra Turrax machine equipped with an S25 KV25F spindle. This spindle was equipped at its submerged end with a rotor having an outer diameter of 18 mm, inserted into a stator having an outer diameter of 25 mm. The “gap” between the rotor and the stator was 0.5 mm. The rotor rotated at a speed of 9500 rpm. During the stirring, the pH was stabilized at 7.5. At the end of the stirring, a calcium phosphate gel was obtained containing 33% of solids and whose viscosity was 300 centipoise.

Provenance & Evidence