A copper concentrator has been designed provisionally with a 3 stage crushing circuit. The final stage is
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Question:
A copper concentrator has been designed provisionally with a 3 stage crushing circuit. The final stage is in closed circuit with a screening system. For production of feed suitable for flotation, a rod mill/ ball mill combination has been selected.
- Draw the complete comminution circuit for this mineral processing plant. Use correct symbols for the equipment.
- Using the information listed below, estimate the size of mills required. State any assumptions made. Also sketch the complete comminution circuit for this mineral processing plant.
Data Available
- Overall plant throughput = 12,000t/day
- Estimated grinding circuit availability = 93%
Sizing Data
- Feed from crushing plant = 80% passing 17 mm
- Suggested rod mill discharge size = 80% passing 1.2 mm
- Flotation feed sizing = 80% passing 75µm
Bond Grindability Data:
- Rod mill work index = 13.5 kWh/t
- Bond mill work index = 12.5 kWh/t
Mills Operating Data:
- Both mills operate at 75% of their critical speeds
- Aspect ratio (L/D) of the ball mill is 1
- Aspect ratio (L/D) of the rod mill is 2
- Mill fill factor (J) for both mills is 0.4
- K(J) for the ball mill is K(J) = J(J-1)2
- K(J) for the ball mill is K(J) = J(1-J)
- Assume the Bond Power model for ball mill also applies to the rod mill
- Assume a toe angle of 30˚ for both mills
Related Book For
Fundamentals of Physics
ISBN: 978-0471758013
8th Extended edition
Authors: Jearl Walker, Halliday Resnick
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