What are the raw materials used in manufacture of Portland cement? How

1.	What are the raw materials used in manufacture of Portland cement? How is it manufactured?
Answer» Limestone and clay are raw materials used in manufacture of cement. It is prepared by heating powdery mixture of limestone and clay in dry process. In wet process, fine – powdered mixture is converted into slurry by adding water and then it is heated at a temperature 1500°C to 1600°C, the product formed is called clinkers. It is cooled down and mixed with gypsum (CaSO₄, 2H₂O) and then it is powdered.

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