Roll crusher is widely used for fine or superfine crushing in the industries of mining, construction materials, metallurgy, chemical industries and so on. It can crush all kinds of materials under middle hardness, such as ore, rock, coke, coal, clinker, ceramic raw materials, slag, refractory materials, chemical materials and so on. For example, to make silica sand from quartz or silica stone; crush iron ore into fine powder for iron ore beneficiation ; to make machine-made sand from cobblestone or building waste; to do fine crushing of potash feldspar and soda feldspar for ceramic industry; to do fine crushing of limestone for desulfurization in heat and electricity industry; to do precrushing of the cement raw materials before feeding into the mill etc.