At what stage of cement manufacturing we add gypsum and why

At what stage of cement manufacturing we add gypsum and why? Also, discuss the effect of adding a lot of gypsum to the cement

Solution

In cement manufacturing, after cooling of the clinkers a small amount of zypsum is added to the mixture. Then clinkers are grinded off.

Gypsum is added to the cement because it controls the setting time of the cement and it also controls the rate of hardening of the cement.