Method of Grinding a Mineral Containing Ore
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United States of America Patent
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Issued Date -
Oct 14, 2010
app pub date -
Dec 10, 2008
filing date -
Dec 14, 2007
priority date (Note) -
Abandoned
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Abstract
A method of grinding a mineral-containing ore, which includes grinding the mineral-containing ore in a primary milling process and thereafter fine grinding the mineral-containing ore in a secondary ball-mill. A composite grinding medium comprising a mixture of steel balls and pebbles is used in the secondary ball-mill. The pebbles have an average size which is relatively smaller than the average size of the balls. The grinding medium includes an optimum mixture of approximately 25% pebbles and 75% steel balls by volume. The pebbles have a hardness which is substantially equivalent to or relatively harder than the hardness of the mineral-containing ore. The use of the composite grinding medium including the optimum mixture of steel balls and pebbles results in significant savings in energy consumption together with a reduction in ball consumption.
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