What are the major raw materials used in the manufacture of cement?

[amp_mcq option1=”Limestone and clay” option2=”Al₂O₃ and limestone” option3=”Fe₃O₄ and clay” option4=”Clay and MgO” correct=”option1″]

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UPSC Geoscientist – 2022

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The correct answer is Limestone and clay.

Cement is manufactured by heating a mixture of calcareous materials (primarily calcium carbonate from limestone) and argillaceous materials (clay or shale containing silica, alumina, and iron oxide).

Limestone (providing CaO) and clay (providing SiO₂, Al₂O₃, Fe₂O₃) are the two main raw materials used in the production of Portland cement. They are mixed in specific proportions and heated in a kiln to produce cement clinker, which is then ground into the final product.

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