将凹凸棒石与Ca(OH)2-H_2O-CO_2系统相结合,采用非均相成核法制备了碳酸钙修饰凹凸棒石复合粉体.并对复合粉体的白度、粒度、物相、微观形貌进行了测试和分析,结果表明:凹凸棒石粉体白度由71.13提高到93.37, 平均粒度D90由244.620 μm减小到22.091 μm,复合粉体中碳酸钙粒径为30～40 nm.对复合粉体的形成机理进行了探讨.
Incorporate the attapulgite and the system of Ca(OH)_2-H_2O-CO_2, the composite powder of attapulgite modified by calcium carbonate used the method of heterogeneous nucleation were prepared. The whiteness, distribution of particle size, the phase constitution and the microscopic pattern were tested and analysed.The results show that the whiteness of attapulgite has raised from 71.13 to 93.37, the average particle size D90 decreases rapidly from 244.620 μm to 22.091 μm and the size of calcium carbonate particle is 30-40 nm. The formation mechanics of composite powder were discussed.
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