Roller mills are mills that use cylindrical rollers, either in opposing pairs or against flat plates, , Roller mills for rock complement other types of mills, such as ball mills and , The moistened grain is first passed through the series of break rollers, then sieved to separate out the fine particles that make up white flour.
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Detail of flint used in a building in Wiltshire, England Striped flint Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety , Flint was used in the manufacture of tools during the Stone Age as it splits into , Flint pebbles are used as the media in ball mills to grind glazes and other raw.