Process of preparing hydroxylapatite

Details Process of preparing hydroxylapatite Process of preparing hydroxylapatite

C - Chemistry, Metallurgy

01

B

23/68

C01B 25/32 (2006.01)

Patent

CA 1297656

PROCESS OF PREPARING HYDROXYLAPATITE Abstract of the Disclosure This invention relates to the manufacture of hydroxylapatite in a through-solution process wherein monobasic calcium phosphate is reacted with a calcium hydroxide solution. In a preferred embodiment, an acidic premix is formed by reacting phosphoric acid and calcium hydroxide with high shear agitation in a first stage, and thereafter reacting the acidic premix with a saturated solution of calcium hydroxide also under high shear agitation in a second stage. The second stage reaction is carried out in an alkaline solution by carefully metering the acid premix into the calcium hydroxide solution whereby the pH of the solution is maintained above 11 until the reaction is near completion. It is particularly preferred to use a stoichiometric portion of calcium hydroxide in carrying out the reactions. After the hydroxylapatite precipitate is recovered, it may be sintered at a temperature between about 700°C. and 1100°C. for about 5 to 30 minutes to form a crystalline hydroxylapatite.

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