Introduction to Cement Mill
A cement mill is the gear utilized to grind the tough, nodular clinker from the cement kiln into the fine grey powder that is cement. Most cement is currently ground in ball mills.
Higher pressure roll presses
These consist of a pair of rollers set eight-30 mm apart and counter-rotating with surface speed around .9 – 1.8 m.s-1. The bearings of the rollers are created to deliver a stress of 50 MPa or a lot more. The bed of material drawn between the rollers emerges as a slab-like agglomeration of very-fractured particles. The power efficiency of this procedure is comparatively higher. Systems have been created, like a de-agglomerator and separator, that will deliver material of cement fineness. Even so, particle size distribution is again a problem, and roll presses are now increasingly well-liked as a “pre-grind” method, with the cement finished in a single chamber ball mill. This offers good cement performance, and reduces power consumption by 20-40% compared with a standard ball mill technique.
Capacity of cement mills
The cement mill on a cement plant are typically sized for a clinker consumption significantly higher than the output of the plant’s kilns. This is for two causes:
The mills are sized to cope with peaks in market demand for cement. In temperate nations, the summer season demand for cement is generally much higher than that in winter. Excess clinker developed in winter goes into storage in readiness for summer season demand peaks. For this explanation, plants with highly seasonal demand normally have quite huge clinker stores.
Cement milling is the biggest user of electric power on a cement plant, and due to the fact they can effortlessly be started and stopped, it usually pays to operate cement mills only in the course of “off-peak” periods when more affordable power is available. This is also favourable for electricity producers, who can negotiate energy prices with major users in order to balance their generating capacity more than 24 hours. Far more sophisticated arrangements such as “energy shedding” are often employed. This consists of the cement manufacturer shutting down the plant at brief notice when the energy supplier expects a crucial demand peak, in return for favourable prices. Clearly, a lot of excess cement milling capacity is needed in order to “catch up” after such interruptions.
Cement Mill clinker is normally ground using a ball mill. 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 around when every couple of seconds.
The drum is usually divided into two or 3 chambers, with different size grinding media. As the clinker particles are ground down, smaller media are a lot more effective at decreasing the particle size nonetheless additional.
Grinding systems are either ‘open circuit’ or ‘closed circuit.’ In an open circuit technique, the feed price of incoming clinker is adjusted to obtain the preferred fineness of the solution. In a closed circuit technique, coarse particles are separated from the finer item and returned for additional grinding.
Gypsum is interground with the clinker in order to manage the setting properties of the cement. Clinker grinding uses a lot of energy and the cement becomes hot – this can result in the gypsum becoming dehydrated, with potentially undesirable results – see the link at the bottom of this web page for far more data.
cement mill
cement mill
cement mill
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