搅拌型式对球形Ni(OH)2物理性质的影响

Influence of Stirring Pattern on Physical Quality of Spherical Ni(OH)_2

在不同搅拌方式下用控制结晶方法制备了球形Ni(OH)2,用扫描电镜、BET比表面分析及激光粒度分析方法对制得的Ni(OH)2进行了表征。研究表明:下叶轮为透平桨的搅拌系统使产品的振实密度随搅拌强度呈稳定的近线性的正相关,得到粒度呈正态分布和堆积密度大的产品,比表面积及平均粒度随输入能量的改变而稳定地变化;而推进式桨则使振实密度、比表面积及平均粒度对搅拌强度的变化敏感而不规律,制备的产品粒度呈非正态分布,堆积密度小。可见下叶轮应用透平桨使流体对流方式更加平稳可控,在同样的能耗条件下得到的产品性能比推进式桨更好。

Under different stirring systems, controlled crystallization method was applied to prepare spherical Ni（OH）2 characterized with scanning electronic microscopy, BET specific surface area and laser size analyses. It is resulted that the stirring system using turbine oar as the low impeller makes the tap density stably and linearly increases with the increase of the stirring strength and leads to the products with normal distribution sizes and high tap density, the specific surface area and the average size alter stably with the change of the input energy as well. Otherwise, the stirring system using push oar as the low impeller makes the tap density, the specific surface area and the average size alter acutely and unexpectedly when the stirring strength changes and leads to the products with abnormal distribution sizes and low tap density. So turbine oar as low impeller makes the convection of the fluid stable and easily controlled and leads to the products with better performances than push oar at the same energy consumption.