A stock of 300 pounds of 1 5/8-inch sillimanite balls was donated by the Champion Spark Plug Co. for grinding tests. They were true spheres,

Selection of Volume of Ball Loads in Continuous Dry Open Circuit Grinding: The tests reported in tables 19 and 20 were made in cooperation with a

Table of ContentsCritical Speed & Power Speed CurvesEffect of Particle Size and Mill Power The study of grinding is a study of cause and effect.

In table 3 of a recent publication a report was made on the use of pipes (instead of rods) stuffed with different materials to give

Table of ContentsBatch Mill Grinding of OreOpen Circuit Grinding Batch Mill Grinding of Ore Batch grinding affords the best opportunity for first studies of pulp consistency. Table

Table of ContentsEffect of Rod Mills Ore Charges & SpeedsEffect of Rods Sizes & Speeds  In a study of rod-mill discharge openings of different sizes,

Table of ContentsSelective and Non-Selective GrindingLarge Balls & Small Rods Compared When the mill is rotated without feed or with very fine feed, the rods

Table of ContentsBatch Ball Mill GrindingWet and Dry Open Circuit Ball MillingType of Grind with Different Amounts of Ore Charges in Wet and Dry Ball

Table of ContentsDry-Batch Ball Milling with Various Ore ChargesDry-Batch Ball Milling with Equal Ore Charges and at Various Speeds Chert, which is very hard, and

When the amount of ore in the mills was the same, no appreciable difference between batch and continuous open-circuit ball-mill grinding was found. This should