采用不同石灰原料制备纳米碳酸钙的研究

采用自制高活性度石灰和传统工业立窑煅烧石灰两种原料来合成纳米碳酸钙,对碳化过程中悬浮体系的pH值和粘度的变化规律及碳酸钙产品的质量进行了比较分析。结果表明:同采用传统工业立窑煅烧石灰为原料相比,以高活性度石灰为原料时碳化体系具有相对更短的碳化反应后期,碳化过程中悬浮体系的峰值粘度相对较大,且峰值粘度出现的时间提前了约3min;采用高活性度石灰为原料所制得碳酸钙粒子粒度细小(15～30nm),白度高(98.5),分散性好。

Study on synthesis of nano calcium carbonate via different lime

The nano calcium carbonate was synthesized by using the lime with high activity and the lime calcining from traditional industrial kiln as primary materials. The change of pH value and viscosity in carbonization process of suspension were compared and analyzed. It was shown that, compared with the lump lime calcining from traditional industrial kiln, the carbonization system with shorter carbonization reaction anaphase and higher peak value of viscosity, and the appearing time of peak value of viscosity were advanced about 3 min by using the lime with high activity as primary materials. Nano-CaCO_3 particles with smaller particle size (15～30 nm) and high whiteness (98.5) and better dispersivity could be synthesized via the lime with high activity under the same carbonization conditions.