Cement ball mill, also names cement mill, cement clinker mill, is the key equipment for grinding cement clinker, gypsum, limestone, clay, coal after crushing process. This is essentially a large rotating drum containing grinding media - normally steel balls. As the drum rotates, the motion of the balls crushes the clinker. The drum rotates approximately once every couple of seconds.
Grinding systems are either 'open circuit' or 'closed circuit.' In an open circuit system, the feed rate of incoming clinker is adjusted to achieve the desired fineness of the product. In a closed circuit system, coarse particles are separated from the finer product and returned for further grinding. Systems have been installed on Cement clinker, blast furnace slag, calcined alumina, calcium carbonate. Dry ball mills are effective grinding systems in the general range of 500 microns down to 5 microns.
Cement ball mill structure
Cement Mill is composed of feeding part, discharging part, turning part and driving part (reducer, small driving gear, electric motor and electric control). The quill shaft adopts cast steel part and the liner is detachable. The turning gearwheel adopts casting hobbling process and the drum is equipped with wear-resistant liner, which can increase mill productivity, reduce mill power consumption. The machine is with stable and reliable working condition. Moreover, according to different materials and discharging methods, there are dry ball mills and wet ball mills for choice.
Cement production line
Limestone of differing chemical composition is the major resource to produce cement. Limestone is carefully blended before being crushed to provide consistent chemical composition. Once these materials have been crushed, this raw material will be transferred to the raw material grinding mills. To continue Portland cement clinker is a dark grey nodular material made by heating ground limestone and clay at a temperature of about 1400 C-1500 C. The nodules are ground up to a fine powder to produce cement, with a small amount of gypsum added to control the setting properties.
Transport belt conveyor transfers the blended raw materials to hammer and ball mills where it is ground. Then the raw materials go through rotary kiln, and cement clinker will be produced.
The dry process kiln is shorter than the wet process kiln and is the most fuel-efficient method of cement production available.
In the cooler unit, the cement clinker will be transported to closed storage areas.
Different types of cement are produced by mixing and weighing proportionally the following constituents: Clinker, Gypsum, Limestone, Blast Furnace Slag. These materials are ground in cement mill and then stored in large silos. Careful quality control ensures consistent high performance of the product produced.
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