The diameter of a ball mill is 3 m and the diameter of the balls in the ball mill is 50 cm. What is the critical speed of the ball mill?
A. 26.76 rev/min
B. 53.52 rev/min
C. 25.81 rev/min
D. 30.45 rev/min
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A concentrator pilot plant is fed with 1 tonne of copper ore at ROM grade of 1.5% Cu. Metal recovery in the concentrator pilot plant is 90% and the grade of copper in concentrate is 20%. The amount of copper in concentrate in kg is
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Set of a Jaw crusher dictates on
A. feed size
B. resistance time
C. flocculation time
D. discharge size
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Hydrocyclones are used in ore treatment plant to separate
A. Coarse and fine particle
B. Mineral and gangue
C. Concrete and tailings
D. None of the above
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Which of the following statement regarding Stokes law is true?
A. Stokes law is only valid for the region of non-viscous flow
B. Stokes law is hold good for all particles below 40 μm
C. Stokes law is hold good for all particles above 40 μm
D. Stokes law is only valid for non-spherical particles
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Froth flotation is used in ore treatment plant to separate
A. Two minerals in one
B. Mineral and gangue material
C. None of the above
D. Both A and B
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Magnetic separation is
A. A dry method
B. An wet method
C. Combination of two
D. None of the above
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A concentrator pilot plant is fed with 1 tonne of copper ore at ROM grade of 1.5 % Cu. Metal recovery in the concentrator pilot plant is 90% and the grade of copper in concentrate is 20%. The amount of concentrate produced from 1 tonne of ore in kg is
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What will be the value of d50 for the specified overflow of 60% passing 74 m when the value of the multiplier is 2.08?
A. 62.08 μm
B. 35.52 μm
C. 124.8 μm
D. 154.0 μm
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To separate two finely divided solids from one another, the process to be selected is
A. Flotation
B. Washing
C. Jigging
D. None of the above
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