GRINDING AND PARTICLE SIZE ANALYSIS

PRACTICAL 1
TITLE: GRINDING AND PARTICLE SIZE ANALYSIS
AIM: TO DETERMINE THE EFFICIENCY OF A BALL MILL
APPARATUS AND THEIR USES:
500g of crushed limestone.
A ball mill with steel balls: it is a powered machine used for grinding the crushed mineral. It reduces the limestone to about 10-300 micron.
A generator: it powers the ball mill and the weighing machine.
Analytical weighing machine: used for taking the mass of the particles from sieves of different size.
Laboratory sieve: it is used for classifying the particles into different sizes. We have sieves with screen size 2000,1180, 600, 425, 300, 212, 63, 38, pan.
A hand brush for clearing the ground particles on the inner walls of the ball mill.

PROCEDURE FOR THE EXPERIMENT:
The already crushed limestone is fed into the ball mill for further liberation. The ball mill grinds it for 10minutes, powered by a standby generator.
After 10 minutes, the ground limestone is poured out and the walls of the ball mill, is cleared with the aid of the hand brush.
The ground limestone is placed on the weighing machine where a mass of 420g which is our feed size is obtained.
The ground limestone of mass 420g is fed into the sieves with sizes arranged in the order of 2000,1180,600,425,300,212,63,38,pan. The pan is shaking so that the particles will move gradually down to the pan; duration about 20-30 minutes.
The particles left on each sieve (over size), is poured out and weighed so as to obtain the weight retained.

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                              OCCUPATION IN NIGERIA
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ADVERTISING
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