vertical roller mill operation
Stone crusher is suitable for the soft or hard and extremely hard materials crushing, plastic, vertical roller mill are widely used in all kinds of ores, cement, refractories, aluminum every soil clinker, carborundum, glass raw materials, mechanisms, building sand, stone and a variety of metallurgical slag, especially for silicon carbide, corundum, sintered bauxite, the sand hard,Stone production line equipment maintenance tips hard and abrasive wear resistance materials is higher than other types of crusher production effect.
Application of vertical roller mill
vertical roller mill is used for grinding of cement, lime, glass, as well as a number of chemical and metallurgical materials. With its data base and test equipment forecasts operating results of many more materials of other industries where coarse, fine or very fine grinding is required. The mills are air swept and suitable for drying, when this air is heated. The type is designed for coal grinding.
Operating principle
The coarse material is fed to the center of a round table rotated by an electric motor with gearbox. The material spreads down the slope of the central pile and further by centrifugal force. Conical grinding runners are pressed on the rotating material bed by means of hydraulic or pneumatic and occasionally also by spring force. The ground material passes a retainer ring at the periphery of the table, where it is picked up by a swirled air stream drawn from the lower part of the vertical roller mill and lifted completely to the inlet of an internal separator. The coarse fraction is returned to the center of the table. From the separator outlet the final product reaches cyclones or filters for separation from the air, which is fully or partially recirculated to the mill. The entire circuit is under negative pressure for dust free operation.
Advantages No contact between runners and casing Quick adjustment of grinding pressure by adjustment hydraulic-pneumatic pressures Easy access for replacement of runners, casing and segments of the rotating table without dismantling of the grinding chamber and separator Reduced foundation requirement due to reduced external forces Electric power saving by narrowed mill body for lift of ground material without recirculation Responsive and continuous regulation of product fineness Suitable for drying of free flowing raw materials at high air temperature vertical roller mill is used for grinding of coal, petroleum coke, anthracite and other explosive fuels. The equipment meets the safety and operation requirements, e.g. instantaneous release of overpressure caused by an explosion of the material. The mill releases exploded material out of the area of the grinding plant. Basalt crushing process solutions Fire is extinguished by water inside the mill and/or by sealing of all flexible parts against access of ambient air with oxygen.Part of the mill is the dynamic air separator, which respects the same standards as the mill itself.