高纯度铝酸三钙的制备

摘要

以碳酸钙、氢氧化钙和氧化铝为原材料,选用不同煅烧温度、保温时间及煅烧次数,确定制备高纯度铝酸三钙(C3A)的方法.经X射线衍射(XRD)和扫描电镜(SEM)分析,结果表明:最佳制备方法为以氢氧化钙为钙质原料、氧化铝为铝质原料,煅烧温度为1 320℃,保温时间为3h,经3次煅烧研磨得w(f-CaO)为0.45％的高纯度C3A；水化10 min的C3A具有较高的水化活性.%Using calcium carbonate, calcium hydroxide and alumina as raw materials and choosing different sintering temperature, soaking time and burning times,we confirm the preparation method of high purity C3A. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses show that high purity C3A is synthesized with calcium hydroxide as calcium material, alumina as aluminum material and by sintering at 1 320 X, , holding for 3 h, grinding and sintering for 3 times. And the f-CaO content in C3 A is 0.45 %. The C3A hydrated for 10 min has high hydration activity.