... non-flammable and non-explosive. Examples of the materials are: quartz, feldspar, barite, fluorite, dolomite, garnet, carborundum, bauxite, zircon, marble ... spring and centrifugal force, rolls close up to grinding ring, its rolling pressure is 1.2 times higher than ... keep the constant grinding pressure between grinding roller and grinding ring, stable output and fineness are guaranteed. III. High ...