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quartz grinder mill hardness 9 in moh s scale

Mar 14, 2019 To determine the hardness of the test material any improvised means such as a fingernail (2.5), a knife (5.5) or glass (5.5) can be applied. It makes this method simple and affordable. In most cases, the hardness coefficient of the material crushing in ball mills is in the range from 6 to 9 on the Mohs scale.

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