A watermill or water mill is a mill that uses hydropower It is a structure that uses a water wheel or water turbine to drive a mechanical process such as milling (grinding), rolling, or hammering , The waterwheel was found in China from 30 AD onwards, when it was used to power trip hammers, the bellows in smelting iron.

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Vertical roller mills (VRM) can replace ball mills or tube mills used for preparing , In China, as of use of VRMs for coal grinding had a market penetration of.

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