MINERAL AND ENERGY RESOURCES IN INDIA
MINERALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gypsum and lead
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Cobalt and limestone
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Dolomite and limestone
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Zinc and bronze
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Detailed explanation-1: -Dolomite and limestone provide raw materials for cement industry.
Detailed explanation-2: -Limestone is one of the key minerals used in cement making. Limestone is a sedimentary rock composed mostly of the calcium carbonate (CaCO3) and, according to the Mineral Education Coalition, comprises about 15% of the Earth’s sedimentary crust.
Detailed explanation-3: -Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. Common materials used to manufacture cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore.
Detailed explanation-4: -Limestone is used as a raw material in cement industry. It is the main ingredient for the production of cement. About 1.5 tonnes of limestone is used in the manufacture of 1 tonne of cement.
Detailed explanation-5: -Incorporating superfluous fine limestone powder or coarse limestone powder increases the porosity of cement-based materials due to dilution effect. The chemical effect of limestone powder generates carboaluminate, stabilizes the ettringite and thus reduces the porosity of cement-based materials.