Experimental Study on Flow Field Characteristics in Seed Precipitation Tank and Influence on Physical Properties of Al(OH)3 Products

Abstract

Compared with the traditional air-mixing seed precipitation tank, the mechanical stirring seed precipitation tank has the characteristics of low energy consumption, less knot at the bottom of the tank, and uniform slurry mixing. In this paper, a new type of HSG/HQG combination impeller is used to study the liquid–solid two-phase mixing system in the mechanical stirring seed precipitation tank. The combination of PIV software technology and experimental tank test is used to study the internal flow of the stirred tank. The properties of the field and various types of agitator are tested, and the physical properties of the seed decomposition products are tested under different impeller types and speeds. The results show that under the same physical parameters, using new HQG/HSG impeller structure, the crystal morphology of the seed products is better, the average particle size is more uniform, and the wear index and specific surface area are improved.