For a given size of particles contained in the mill discharge (40% passing 45 microns), the simulation results also indicated that reducing the percent solids in the industrial mill from the currently used 83% to a value between 76% and 80% would result in an increase in mill capacity of about 10%, and consequently decrease the specific energy
discharge ball mill converts about 20% more energy than an overflow discharge mill with the same shell dimensions. Ball mill shells are often furnish ed with two manholes. Ball mills - with small balls or cylpebs - can produce the finest product of all tumbling mills. 80% minus 74 microns is a normal require ment from the concentrators
These tests were done with a ∅0.82 x 1 m grate discharge mill with a 30 mm graded ball charge and a 30% filling degree. The mill discharge pulp density was increased from 68.8% to 75.9% solids. The data is summarized in Table III. The example in Table III illustrates that the density has a large influence on the grinding efficiency. In this
40 60 80 100 120 140 0 1020 304050 607080 90 100 110 Grind Product P80 microns Net Energy kWh/t Ball Mill IsaMill. the particle. But for a 9 micron particle
We recently converted a grate discharge type ball mill (size 5.7X8.6m) to an Overflow type. Before conversion, the ball level was 26%, and we were able to obtain a grind of 90%+ passing 75mic at a throughput of 350t/h. After conversion it’s a nightmare to obtain 90%+ passing 75mic at the same thro
2. From the ball mill discharge size distribution calculate the %+75 μ as: 100 – 26.5% = 73.5% +75 μ. 3. Calculate the CSE as the average: (80.7 + 73.5) 2 = 77.1% + 75 μ. In this example the ball mill circuit classification system efficiency is 77.1 per cent at 75 μs. This means that
The final products had top sizes of 40, 20 and 10 microns. The air-swept mill configuration provided the best results both on energy and capacity basis. During production of material with top size of 40 microns, it was possible to increase the grinding capacity up to 28% when compared to
(24.8 lb) of ball mill feed sample from plant survey. Sample is reconstituted with water to be the same percent solids as the plant ball mill discharge. Mill speed: 35.2 rpm (65 percent of critical speed) Length of time of test: 363 seconds Average torque reading: 1,056 in-lbs Mill HP = (1,056 in-lbs /
Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 – 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns.; The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges
Since for the ball mill design we are using 80% passing, the required value of C2 for the ball mill will be equal to1.20. C3 is the correction factor for mill diameter and is given as;
A Turkish company produces 20,000 tons of 4-40 micron calcium carbonate classifying and ball mill production line A Greek company has three classifying and ball mill production lines with an annual output of 120,000 tons of 4-100 micron calcium carbonate, 20,000 tons of 4mm bentonite and 5,000 tons of 6-63 micron talc
The ball mill was tested as a grate discharge mill and as an air-swept mill. ... The final products had top sizes of 40, 20 and 10 microns. The air-swept mill configuration provided the best
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