生产球形纳米碳酸钙新型碳化反应器开发研究

New carbonation reactor for the preparation of sphere-like nano-calcium carbonate

已经工业化的纳米碳酸钙生产方法所生产的产品多为立方形和纺锤形,目前还没有生产球形纳米碳酸钙的工业方法。给出了一种生产球形纳米碳酸钙的喷射—乳化新型组合式碳化反应器,并进行了小试和中试实验研究。在小型实验装置上,采用正交试验的方法,确定出粒度分布窄的球形纳米碳酸钙的最佳反应条件为:温度15℃,氢氧化钙浆液质量浓度65 g/L,气液体积比51∶。在完成小试的基础上,建成了年产60 t纳米碳酸钙的中试实验装置,并成功制备出平均粒径80 nm球形纳米碳酸钙。

There are cubic form and spindle form of nano -CaCO3 in current industrial production and no sphere form of the nano- CaCO3 produced. A new carbonation reactor,which is combined in spryer and emulsor,was developed to prepare sphere - like nano - calcium carbonate, and the experiments were made both in bench - scale and pilot - scale with 60 t/a. The optimal operation conditions were given based on orthogonal experiments. The optimal temperature of nano - calcium carbonate with narrow size distribution is 15℃ ,Ca（OH）2 slurry concentration 65 g/L and the volume ratio of gas/liquid 5： 1. The average diameter of sphere - like nano - CaCO3 from pilot - scale is 80 nm.