report 4 - d d dd50 50 Yc50c dd50 EXM 301 MINERAL...

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d 50 d 50c dd50 dd50 Yc EXM 301 MINERAL PROCESSING LAB REPORT 4 A REPORT ON FINE PARTICLE CLASSIFICATION KYLIE NETTLETON 30262427 L CONTENTS 1.00AIM 2.00INTRODUCTION 3.00PROCEDURE 4.00RESULTS 5.00DISCUSSION 6.00CONCLUSION 7.00REFERENCES 8.00APPENDIX Page 1
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1.00AIM This experiment aims to evaluate the effectiveness of the Warman cyclone and Teeter column as classifiers. 2.00INTRODUCTION “The hydrocyclone is continuously operating classifying device that utilised centrifugal force to accelerate the settling rate of particles” 1 Hydrocyclones are important devices with in the minerals industry and are extremely efficient for fine particle classification. Other hydrocyclone applications include desliming, degritting and thickening. Essentially, particles with in a fluid entre the system through the feed inlet and are subjected to an outward centrifugal force and an inward acting drag force. Particles are separated according to size, shape and density as the heavier and larger particles move to the sides of the cylindrical section and migrate toward the apex, exiting to the Underflow, while the lighter and smaller particles are carried upward through the vortex finder and exit the system to the overflow. Teeter columns provide are a method of obtaining a cleaner separation through the exploitation of particle density. A water current is introduced at the bottom of the column, flowing against the natural fall of particles under gravitational force. The velocity of the water is greatest at the introduction point and dissipates further up the column. A particle will fall until its falling velocity equals that of the upward current. Once this point is reached, this particle will remain suspended until it is disturbed. The impending disturbance arrives as more and more particles settle at the same height as each other, constricting the flow of other more dense particles. Particles begin to move upwards in between the more dense particles being pushed down. They follow the upward path of least resistance which is often towards the centre of the column mass. The particle will rise through the constricting mass until it reaches a point with little upward resistance and again falls under the gravitational force. The cycle will continue as particles scour each other, in effect cleaning the slimes off of each other as they rub past the in the rising and falling motions (referred to as teetering). Slimes are reduced through this method as they are liberated from the particle, they rise and are released from the system and proceed to the
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report 4 - d d dd50 50 Yc50c dd50 EXM 301 MINERAL...

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