NOUFERROUS METALLURGICAL EQUIPMENT

As one of critical steps in alumina production, seed precipitation adopts the core equipment, seed precipitation tanks inside which flow field distribution is a key factor influencing sedimentation, scaling and stirring power. This paper has used Fluent, Realizable κ-ε model of RANS, Eulerian multi-phase model and multi-reference frame (MRF) method to conduct numerical simulation of flow field inside seed precipitation tanks and study the influence of stirring speed, distance between blade and the bottom as well as blade diameter on solid particle distribution pattern of aluminum hydroxide. The analysis of concentration field and velocity field shows that on the premise of a fixed stirring power, blades with higher speed and larger diameter are beneficial to suspension of particles, while blades with a too small or too large distance to the bottom can affect suspension of particles.