关键词: 铝土矿, Fluent, 搅拌器

Abstract: According to the properties of bauxite, a new gravity separator for silicates removal from bauxite has been designed for the pre-separation of bauxite. Based on the determination of optimal process parameters, the agitator, the key component of the gravity separator, was optimized. The software of GAMBIT was used to establish the three-dimensional entity model and grid generation. Based on standard turbulence model   and FVM (Finite Volume Method), combined with three-dimensional incompressible reynolds-averaged navier-stokes equations, MRF (Multiple Reference Frame), the flow field inside the equipment were simulated with CFD(computational fluid dynamics) numerical software Fluent for different agitators. The results show that the increase of arm incline angle of agitator can not improve the distribution difference of alumina and silica. With the increase of horizontal agitator tooth depth, the turbulence intensity change gradient on the surface reduced gradually and the turbulence intensity tended to be even, and the ratio of Al/Si of underflow was improved greatly. but there was only a small decline of the yield ratio and Al2O3 recovery. Actual ore separation experiments verified the feasibility that Fluent numerical simulation can be used to design agitators.

Key words: Bauxite, Fluent, Agitator