A ball mill is to grind 250 tons/day of calcite having a specific surface of 90.34 cm/g. No recrushing of materialis to be done. Overall energy effectiveness of the ball mill is 7.5%. Rittinger's number of calcite is 1053 cm?/ft-Ibf.Assuming the calcite have densities=2 g/cm³ and are perfect spheres, find required energy.MassFractionMesh SizeDiameter(cm)10/140.02514/200.07420/280.18328/350.252.535/480.14248/650.11165/1000.080.5100/1500.050.5150/2000.040.1200/2700.03250.2270/4000.02750.1

To find: The required energy σf, Given : The specific surface of feed σi=90.34 cm2g The overall…

A ball mill is to grind 250 tons/day of calcite having a specific surface of 90.34 cm²/g. No recrushing of material is to be done. Overall energy effectiveness of the ball mill is 7.5%. Rittinger's number of calcite is 1053 cm²/ft-lbf. Assuming the calcite have densities=2 g/cm³ and are perfect spheres, find required energy. Mesh Size Mass Fraction 0.02 0.07 0.18 0.25 0.14 0.11 65/100 0.08 100/150 0.05 150/200 0.04 200/270 0.0325 270/400 0.0275 10/14 14/20 20/28 28/35 35/48 48/65 Diameter (cm) PS43NN 5 2.5 2 1 ööööö 5512- 0.5 0.5 0.1 0.2 0.1

A ball mill is to grind 250 tons/day of calcite having a specific surface of 90.34 cm²/g. No recrushing of material is to be done. Overall energy effectiveness of the ball mill is 7.5%. Rittinger's number of calcite is 1053 cm²/ft-lbf. Assuming the calcite have densities=2 g/cm³ and are perfect spheres, find required energy. Mesh Size Mass Fraction 0.02 0.07 0.18 0.25 0.14 0.11 65/100 0.08 100/150 0.05 150/200 0.04 200/270 0.0325 270/400 0.0275 10/14 14/20 20/28 28/35 35/48 48/65 Diameter (cm) PS43NN 5 2.5 2 1 ööööö 5512- 0.5 0.5 0.1 0.2 0.1

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.34P

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