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.degree. C. and 1100.degree. C. for about 5 to 30 minutes to form a crystalline hydroxylapatite.
本发明涉及通过溶液法制备
羟基磷灰石的方法,其中单碱基
磷酸钙与
氢氧化钙溶液发生反应。在一种优选实施例中,首先在第一阶段中通过高剪切搅拌反应
磷酸和
氢氧化钙形成酸性预混料,然后在第二阶段中通过高剪切搅拌反应酸性预混料和饱和
氢氧化钙溶液。第二阶段反应在碱性溶液中进行,通过仔细地将酸性预混料滴入
氢氧化钙溶液中,使溶液的pH值保持在11以上,直到反应接近完成。在反应中特别优选使用
化学计量量的
氢氧化钙。在沉淀出
羟基磷灰石后,可以将其烧结在700℃至1100℃的温度下,持续5至30分钟,形成晶体
羟基磷灰石。