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evaluation of hpgr and vrm for dry comminution of ... the mining industry is searching for more energy efficient and dry comminution equipment as an alternative to ... type of vrm) than a ball mill circuit for a similar degree of comminution. key words: comminution; hpgr; vrm; energy efficiency; air classification; ball mill. 1. ... (from about -40 mm down to about 50 µm) in.
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