cement, in general, adhesive substances of all kinds, but, in a narrower sense, the binding materials used in building and civil engineering construction. Cements of this kind are finely ground powders that, when mixed with water, set to a hard mass. Setting and hardening result from hydration, which is a chemical combination of the cement compounds with water that yields submicroscopic crystals or a gel-like material with a high surface area. Because of their hydrating properties, constructional cements, which will even set and harden under water, are often called hydraulic cements. The most important of these is Portland cement.
There are four stages in the manufacture of Portland cement:
(1) crushing and grinding the raw materials,
(2) blending the materials in the correct proportions,
(3) burning the prepared mix in a kiln,
(4) grinding the burned product, )clinker(
together with some 5 percent of gypsum (to control the time of set of the cement). The three processes of manufacture are known as the wet, dry, and semidry processes and are so termed when the raw materials are ground wet and fed to the kiln as a slurry, ground dry and fed as a dry powder, or ground dry and then moistened to form nodules that are fed to the kiln.
Cement Plant Equipment
- Crusher
- Apron Feeder
- Wobbler Feeder
- Stacker/ Reclaimer
- Vertical Roller Mill
- Ball Mill
- Rotary Kiln
- Grate Cooler
- Hydraulic Roller Press (HRP)
- Al electrical & Electronic components
- All utility units equipment and spare parts