Coal crushing machine and iron crushing machine in India
Clinker Grinding Introduction
Clinker grinding refers the process that material is grinded into fine powder under external force, impact, extrusion, and grinding effect.
On the one hand, clinker grinding is the last step during the cement production process. So the cement grinding system control is directly related to the cement product quality, yield, and cost. On the other hand, cement grinding is the step consuming the most energy. So choosing high quality clinker grinding mill is very important to increase companys economic benefits.
Clinker grinding process
1. Open type clinker grinding process
Materials delivered through clinker mill are the products. The simple process requires fewer equipments, less investment, but could easily cause heavily milled powder
2. Closed type clinker grinding process
The grinded materials are selected by classifier system. The coarse one returns to grinding mill again, in order to reduce heavily milled powder. The closed type clinker grinding process can increase yield, reduce power consumption, and product fineness is easy to control. But the system requires large investment, and complicated operation and maintenance.
Factors which influence the cement output
1. Hardness of raw materials
Gypsum can increase grinding possibility of whole system, improving the output every machine. Limestone is easy to be grinded, which can greatly improve the production of machine. Slag itself is difficult to be grinded, but if you add a certain volume of slag, you can improve the output. Fly ash itself is not easy to be grinded. However, since itself is fine powder, it can greatly make the raw mixture easy to be grinded.
2. Granularity of raw materials
Raw mixture of fine particular size does not require large steel ball. The smaller the particular size is, the easier the raw mixture is for ball mill.
3. Quality of cement mill
Large scale cement ball mill can improve grinding efficiency, save power, and increase economic benefit.
4. Production control system
Input raw materials uniformity Input raw materials temperature Grinding material moisture Effect of raw mixture Grinding AIDS agent influence
5. Type of cement grinding process
There are two kinds of cement production process: open cement grinding process and closed type of cement grinding production. Usually, more cement plants adopt closed grinding process because it has higher output than open grinding process.
Cement ball mill
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.
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