以高活性度石灰为原料制备纳米碳酸钙的研究

Study on synthesis of nanometercalcium carbonate by using the lime with high activity

采用间歇鼓泡碳化法,通过对碳化反应温度、灰乳体积质量、搅拌转速、气体分布器开孔直径、消化浆液陈化时间等影响因素的控制,得到了用高活性度石灰为原料制备纳米碳酸钙的优化工艺条件,制得了平均粒径为15～40nm的纳米碳酸钙产品。

The lime with high activity was used to synthesize the nanometer calcium carbonate particles by introducing CO_2 to lime suspension. The calcium carbonate particles having the mean size of 15～40 nm were prepared. The influence of the operational conditions such as temperature, reactant concentration, stirring speed, orifice diameter of gas distributor, concentration of Ca(OH)_2, slaking slurry aging time etc. on the carbonization process were discussed. The optimum conditions of preparing nanometer calcium carbonate were obtained, which were reaction temperature:10～25 ℃, specific density of Ca(OH)_2:1.04～1.06, stirring speed:600r/min, orifice diameter of gas distributor:1.0 mm, slaking slurry aging time:1h.