Abstract: In order to study mixing performance of a new-style impeller, improved Intermig impeller, in an unbaffled stirred tank of alumina seed precipitator, the profiles of local solid concentration in a liquid-solid system of water-glass bead particles were measured using a PC6D fiber optic reflection probe and analyzed at different conditions. The results showed that the high agitation speed and viscosity of the system are more conducive to uniform distribution. When m=3.50′10-3 Pa·s and n=172 r/min, the multiple relationship of average values of the practice and theory is 1.011 times. It shows that the experimental concentration is closer to theoretical one under this condition, resulting in more even mixing.

Key words: Intermig impeller, seed precipitator, mixing, concentration distribution, rotation speed, viscosity

摘要： 为了研究改进的Intermig桨的搅拌性能，在无挡板的氧化铝种分搅拌槽内，采用PC6D颗粒浓度测量仪对水-玻璃珠液-固体系在不同条件下的颗粒轴向和径向局部浓度进行了测量与分析. 结果表明，较高的搅拌转速和体系粘度更有利于固体颗粒的悬浮. 粘度m=3.50′10-3 Pa·s、转速n=172 r/min时，实验浓度平均值是理论浓度平均值的1.011倍，可见该条件下实验浓度值与理论浓度值更接近，混合更均匀.

关键词: Intermig桨, 种分槽, 混合, 浓度分布, 转速, 粘度