Question

In which of the following industries, limestone is not used?
A) Cement Industry
B) Iron and Steel Industry
C) Oil Refinery Industry
D) None of the above

Answer 1

Hint: Limestone is a sedimentary rock that makes up roughly 15% of the Earth's sedimentary crust and is primarily formed of the mineral calcite. It is a primary material used to make aggregate, cement, lime, and building stone, as well as a basic building block in the construction industry (dimension stone).

Complete answer:
Let us analyze the given options:
Option A) Cement Industry: This is not the correct option because in concrete made using Portland limestone cement, adding limestone improves grind ability, reduces water use, increases strength, and reduces bleeding. Limestone provides nucleation sites for clinker hydration products and decreases hydration heat because of its reactive nature.
Option B) Iron and Steel industry: This is not the correct option because the primary applications of limestone in the iron and steel industry are I as a fluxing material, and (ii) as a desulphurizing agent, coating of pig casting machine moulds, neutralising acidic water, water treatment, wastewater(effluent) treatment, flue gas treatment, and sludge and sewage treatment.
Option C) Oil refinery industry: This is the correct option because an oil refinery, also known as a petroleum refinery, is a manufacturing facility that converts crude oil into products including petroleum naphtha, gasoline, diesel fuel, asphalt base, heating oil, kerosene, liquefied petroleum gas, jet fuel, and fuel oils. There is not any use of limestone in this type of industry.

Therefore the correct answer is option ‘C’. In the Oil Refinery Industry, limestone is not used.

Note: Oil refineries are often vast, sprawling industrial facilities with extensive infrastructure running through them, transporting fluid streams between large chemical processing equipment like distillation columns. Oil refineries are similar to chemical plants in that they use a lot of the same technology.