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在磷酸系晶型控制剂的作用下 ,通过氢氧化钙悬浊液的非均相沉淀法合成了文石型晶须 ,研究了在此方法中晶型控制剂、温度以及初始 p H值等工艺因素对文石生长的影响规律。利用粉末 X射线衍射分析了所合成样品中文石的含量 ,同时用扫描电镜 (SEM)观察了合成晶须的形貌状态。经过实验发现 ,当在氢氧化钙悬浊液中添加磷酸系晶型控制剂后 ,体系具有类似的碳酸化过程 ,但是当采用磷酸或酸性的磷酸盐作为控制剂时 ,作用要优于碱性磷酸盐 ,所获得的样品中文石的含量明显较高。适合于文石生长的温度范围为 2 98K～ 348K,初始酸度值范围为 8.6～ 12 .4。通过研究镁离子与磷酸根离子对文石生长的协同作用后发现 ,镁离子对文石晶体的生长作用明显优于磷酸根 ,当它们同时存在于溶液中时 ,镁离子的作用可以掩盖磷酸根离子的作用。
Aragonite whiskers were synthesized by heterogeneous precipitation of calcium hydroxide suspension under the action of phosphoric acid crystal form controlling agent. The crystal form controlling agent, temperature and initial p H value in this method were studied The Influence of Technological Factors on Aragonite Growth. The content of aragonite in the synthesized samples was analyzed by powder X-ray diffraction. The morphology of whiskers was observed by scanning electron microscopy (SEM). It has been found experimentally that the system has a similar carbonation process when the phosphate type crystal form control agent is added to the calcium hydroxide suspension but the effect is better than that when the phosphoric acid or the acidic phosphate is used as a control agent Phosphate, the sample obtained in the Chinese stone content was significantly higher. Suitable for the growth of aragonite temperature range of 2 98K ~ 348K, the initial acidity range of 8.6 ~ 12 .4. By studying the synergistic effect of magnesium ions and phosphate ions on the growth of aragonite, it was found that the growth of aragonite crystals was significantly better than that of phosphate by magnesium ions. When they were present in solution, the effect of magnesium ions could cover phosphate The role of ions.