A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many processes. There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand (e.g., via a hand crank), working .. SAG mills are primarily used at gold, copper and platinum mines with.
A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing . Ball mills are also used in pyrotechnics and the manufacture of black powder, but cannot be . Some media, such as iron, may react with corrosive materials. . In situ leaching · Gold chlorination · Gold cyanidation · Bayer process.