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发明公开
CN102372300A 针状纳米碳酸钙的制备方法 无效 - 驳回

针状纳米碳酸钙的制备方法
摘要：
本发明提供了一种针状纳米碳酸钙的制备方法，包括如下步骤：(1)将复合晶形控制剂添加至氢氧化钙悬浮液中；所述的复合晶形控制剂为有机酸和水溶性的氯化物或硫酸盐；(2)上述悬浮液通入含二氧化碳的气体进行碳化反应；(3)当悬浮液的pH值降至6.5～7.0时，继续通气15～30分钟，碳化反应结束。本发明的方法制备的针状纳米碳酸钙已有技术方案相比较，产物具有更合适的平均粒径，且粒径可控、分散性良好，产物在通常的研磨强度下不会断裂，产物具有良好的分散性；生产工艺调节控制容易。
摘要（英）：

The invention provides a preparation method of needle-like nano calcium carbonate. The method comprises the following steps: (1) adding a composite crystal form control agent in a calcium hydroxide suspension, wherein the composite crystal form control agent comprises an organic acid and water-soluble chloride or sulfate; (2) introducing a gas containing carbon dioxide in the suspension for carbonization reaction; (3) when the pH value of the suspension is reduced to 6.5-7.0, further introducing gas for 15-30 minutes, and then finishing the carbonization reaction. Compared with the existing technical scheme, the needle-like nano calcium carbonate product obtained by the preparation method has more appropriate average particle diameter, controllable particle diameter and good dispersibility; and the product dose not break under the ordinary grinding strength; and the production process is easy to regulate and control.

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