Numerical Simulation And Experimental Study On Flow Field Of Cyclone Centrifugal Separator

Gravity separation is a clean and effective mineral processing methods.The difference of the mineral density was converted to difference of the settling velocity in the centrifugal force field in order to mineral processing.Fluidized hydrocyclone is a novelty centrifugal concentrator,which is based on the theory of centrifugal separation of fluidization bed and hydrocyclone.With the combined action of centrifugal force and resistance of recoil water,Fluidized hydrocyclone could separate different density minerals.In this paper,the method of computational fluid dynamics and experiment were taken to calculate and analyze the velocity of fluid in the novelty machine.The results of research indicated that fluid velocity of tangential,axial and radial in the machine was reasonable,and the fluid field was steady,fluid state caused by cyclone had a decisive role in the establishment of centrifugal filed.Secondly,according to the CFD calculation results,Ideas which design of separation column should increase the centrifugal strength have been proposed.Different separation column were designed.A separation column with a single sorting structure,a shorter overflow tube,and a bottom 45°cone was selected.Flow field calculations show that the structure is more favorable to Increase the tangential speed and centrifugal strength of the equipment.The CFD-dem method was used to analyze the behavior of the mineral grains at different feed rates and cut diameter.Thirdly,parameters such as the flow ratio of the equipment,the feed pressure,the recoil water pressure and the adjustment range of the underflow were measured.In the hematite grading experiment,the best operating conditions was the feed pressure 50kPa,recoil water pressure 10kPa,bottom pressure 27kPa,and overflow pressure 27kPa.-60?+100,-100?+200,-200 mesh mineral classification efficiency were 80.00%,31.50%,10.00%under the best operating conditions.In the hematite sorting experiment,The results show that the best conditions were feed pressure 50kPa.recoil water pressure 20kPa?underflow pressure 27kPa for-100?+200 mesh hematite and quartz stone(1:1).The raw is iron grade 30%.Concentrate grade and recovery were 45.90%and 79.00%under the best conditions.The results show that the best conditions were feed pressure 50kPa?recoil water pressure 20kPa,?underflow pressure 27kPa for-60?+100 mesh hematite and-200 mesh quartz(1:1).The raw was iron grade 30%.Concentrate grade and recovery were 54.50%and 80.00%under the best conditions.Feed pressure?recoil water pressure and underflow pressure were sorted by orthogonal test.Experiments show that the importance of factors were feed pressure>recoil water pressure>underflow pressure>recoil water pressure and underflow pressure interaction.The research results of this paper provided a theoretical basis and guidance for new machine apply to mineral separation.