The cement production process is mainly divided into three stages: raw material preparation, clinker calcination, and cement grinding, that is, “two grinding and one burning”.
Generally speaking, the cement industry produces Portland cement, which is a fine, gray powder, It consists of calcium (from limestone), silicates, aluminates (clay) and ferrite. In a silicate cement plant, cement production has the following main stages:
Raw material preparation
The clinker is taken out of the clinker silo and sent to the feed bin for mixing with gypsum and additives before entering the clinker mill.
During the clinker grinding process, the clinker and other materials are ground together into a fine powder. Up to 5% of the gypsum or additional anhydrite is added to control the setting time of the cement, and other compounds are added. Many plants use a roller crusher to obtain clinker and gypsum that can be reduced to a predetermined size, which are then sent to a ball mill for the remaining grinding process.
Grinding process in a closed system, the system is equipped with an air separator for separating the cement particles by size, not completely milled material is re-sent through the system.
Storage and shipping
Finished cement is stored in a huge concrete silo.
The cement can be shipped to the customer in bulk or in the wagon, or it can be bagged and sent in a standard truck.