Sepor FC BOND MILL, Руководство по эксплуатации и техническому обслуживанию, Страница: 4 / 19

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FC BOND LAB TEST PROCEDURES
1. Crush ore to be tested to -6 mesh. Eighty per cent (80%) of the ore to be tested should pass 6
mesh but be retained on a 14 mesh screen (-6, +14). Ore to be tested is screened on a 6 mesh
sieve with a 14 mesh sieve, a 60 mesh and fines pan. The minus 14 mesh ore should be
screened and weighed to know the particle size distribution of the feed in the –14 mesh
material. The test volume is 700 ml or cc’s.
2. To determine the approximate weight of the 700 cc grinding test, take a 1000 cc graduated,
clear cylinder, and place the retained 14 mesh particles into the cylinder, shaking the cylinder to
compact the ore, and adding more until the ore compacts at 700 cc in volume. Weigh this
volume (@ 2.6 g/cc this would weigh 1,820 grams) and record the weight.
3. Sample splitters may be used to split numerous increments of the feed, and each increment
poured into the cylinder until the 700 cc volume is obtained.
4. The Ideal Period Product (IPP) is equal to the weight of the 700 cc sample in grams,
divided by 3.5.
5. Conduct a screen analysis and record the weights of each size fraction of the 700 cc feed test
sample.
6. Place the FC Bond Ball charge in the mill.
7. Place the feed sample in the mill.
8. Set the mill revolution counter for a specific number of revolutions for the first test. (Typically
50 for coarse or 100 for fine grinding). Push the mill start button. When the number of
revolutions has been reached, the mill will shut off.
9. Empty the mill, through a screen to retain the grinding balls. Return the balls to the mill.
Perform a screen analysis on the material and weigh each size fraction. Record the data.
10. Perform a screen analysis on the material and weigh each size fraction. Calculate the weight
of the under size (( -106 microns (140 mesh screen) or the size fraction being reduced to in
microns).
11. Determine the amount of undersize product present in test feed (if any).
12. Calculate the number of net grams produced per revolution, by dividing the undersize
weight (in grams) by the number of revolutions the mill rotated.