Fineness is the operating index of the grinding and classification process of the ball mill, and the fineness of the discharge and classifier overflow and coarse sand return should be measured frequently in the ore dressing plant or froth flotation plant in order to adjust the operation in time.

The rapid sieve analysis method commonly used in the mineral concentration plant is more convenient for measurement of Ore Grinding Fineness.

The method is to fill the pulp density pot with a volume of Ⅴ (ml) and a weight of P (G), first fill the slurry to be measured, weigh out the total weight of the slurry and the pot is G (g), gradually and slowly pour the slurry into the inspection sieve which is half submerged in the water (the sieve hole of the inspection sieve is generally 200 mesh or the size of the grading particle size you expect), and constantly shake the screen and change the water until the sieve water is clean.

Testing Sieves

Then wash all the solid material on sieve properly into the original pulp density pot, and add water to the same scale of the original pulp, and then weighing its total weight G1 (g).

Setting the percentage of the material on the sieve is X, the percentage of the material under sieve is Y,
then:
X = [(G1-P-Ⅴ)/(G-P-Ⅴ)] x 100%

Y = {1-[(G1-P-Ⅴ)/(G-P-Ⅴ)]}×100%

If the grinding fineness does not meet the requirements, the following parameters should be adjusted in time: ball mill speed,  ore feed capacity grinding concentration, classification concentration, grinding ball size ratio in the ball mill, etc