Research Of Ultra-fine Powder With Using Turbo Air Classifier

As a third generation classifier the turbo air classifier because of itssuperior performance has been extension and application, and is currentlythe most main dry classifier. Its work is in depth study, and its technologyhas reached a mature stage. Using the traditional parameters can'tcharacterize the dispersion of the powder, so it's necessary to developsome measure to characterize the dispersion.By researching the relationship between the particle size of quartzpowder and the angle of repose, obtaining linear relationship betweencoefficient of friction and average particle size (d50), dfwhich is related tofriction is defined. A new agglomeration parameter F(50) defined as theratio of dfto d50is proposed. The result of the experiment as quartzpowder is known that the smaller the particle size, the bigger F(50),which conforms to the fact that the smaller the particle size, the bigger theagglomeration parameter. So F(50) can measure the agglomeration parameter well.According to fractal theory, the fractal dimensions of the quartzsand and alumina powder were determined with the round nested method.It was proved that the particle of quartz sand and alumina has fractalstructure. It also shows that the round nested method to measure thepowder fractal dimension can characterize the degree of theagglomeration.The spreading plate experimental results proved that there wasrelative motion between the materials and the spreading plate, and theparticles would get different speed according of the different frictionbetween the particles and the spreading plate.