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News, 2019-8-27 · Roll Crusher 260 Time Composite crusher 191 Time Wheel Sand Washer 139 Time VSI Sand Maker 105 Time Sand recycling machine 88 Time Super Ultra-fine Mill 176 Time Power Concentrator 131 Time Belt Conveyor 200 Time Sand Washer 83 Time ...P&Q University Lesson 7, 2019-9-2 · Double roll crushers offer up to a 3-to-1 reduction ratio in some applications depending on the characteristics of the material. Triple roll crushers offer up to a 6-to-1 reduction. As a compressive crusher, the roll crusher is well suited for extremely hard and abrasive materials..

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