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drill and blasting powerpoint

Apr 21 2012 · ABRASION DRILLS DEFINITION Grind rock into small particles through abrasive effect of bit that rotates in hole TYPES hole drills drills d drills Blast hole drills Rotary drill consisting of steel pipe drill stem on bottom of which is roller bit that disintegrates the rock as it rotates over it 9...As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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