The main raw materials used in the cement manufacturing process are limestone, clay, sand, shale and iron ore. Limestone is usually mined on site while the other minor materials may be mined either on site or in nearby quarries. Another source of raw materials is industrial by-products. The use of by-product materials to replace natural raw materials is a key element in achieving sustainable development.

Cement Clinker’s Wet Process:
In the wet process, each raw material is proportioned to meet a desired chemical composition and fed to a rotating ball mill with water. The raw materials are ground to a size where the majority of the materials are less than 75 microns. Materials exiting the mill are called “slurry” and have flowability characteristics. This slurry is pumped to blending tanks and homogenized to insure the chemical composition of the slurry is correct. Following the homogenization process, the slurry is stored in tanks until required.

Cement Clinker’s Dry Process:
In the dry process, each raw material is proportioned to meet a desired chemical composition and fed to either a rotating ball mill or vertical roller mill. The raw materials are dried with waste process gases and ground to a size where the majority of the materials are less than 75 microns. The dry materials exiting either type of mill are called “kiln feed”. The kiln feed is pneumatically blended to insure the chemical composition of the kiln feed is well homogenized and then stored in silos until required.

In the cement manufacturing process, limestone, sand, shale, clay, and iron ore are used as main raw materials. The whole cement process in clued four stage: raw material crushing, calcination, cement grinding, packaging and distribution.

Raw material are complete preheating and precalcining in the cyclone preheater, next procedure is into the rotary kiln in the firing of clinker. In rotary kiln, carbonate further quickly decomposes and start a series of solid reaction, then form the important material in cement clinker. As the material temperature close, mineral will become liquid, dissolved in the liquid phase reactions and form a (clinker). Clinker firing, temperature began to drop. Finally, cement clinker cooling machine will cool the rotary kiln of high temperature clinker to a temperature which downstream conveying, storage tanks and cement machine could bear. At the same time, recovery afterheat of the high temperature clinker, so as to improve the system of the thermal efficiency and quality of materials.

After calcination, the cement clinker need to regrind to final cement products. Fineness of the final products, amount of gypsum added, and the amount of process additions added are all varied to develop a desired performance in each of the final cement products. If you need more information about cement clinker crusher and mill, cement clinker processing technology, cement clinker processing line  design, please contact for more support.