the bogue compound formed first in the kiln above 900 deg celcius
Answers
The bogue compound formed first in the kiln during manufacture of Portland cement is known as Alite.
Alite is a tricalcium silicate (Ca3SiO5) formed in the kiln at a temperature of about 1300 degree Centigrade, as a result of reactions.
During manufacture of Portland cement, the blended raw materials are kept in silos from where they go to the kiln. Decomposition of raw materials and reactions take place when the temperature reaches about 1300 degree Centigrade inside the kiln. Alite is formed as a result and then the Clinker is cooled. Clinker is the fine powder, used as a binding agent in many cement products.
The quality and density of calcium silicate hydrate formed out of C3S is slightly inferior to that formed by C2S. A cement with C3S getsattacked by sulphate easily whereas C2S isoffering better resistance against chemical attacks.