Limestone is added to a blast furnace toAproduce carbon dioxideBproduce carbon monoxide Cremove slag from the iron ore Dremove silicon dioxide from the iron ore
Question
Limestone is added to a blast furnace toAproduce carbon dioxideBproduce carbon monoxide Cremove slag from the iron ore Dremove silicon dioxide from the iron ore
Solution
The correct answer is D. remove silicon dioxide from the iron ore.
Explanation:
In a blast furnace, limestone (calcium carbonate) is added to act as a flux. A flux is a substance that is used to remove impurities from the iron ore, which are mainly composed of silicon dioxide (also known as silica or sand).
When the limestone is heated, it decomposes to form calcium oxide (also known as quicklime) and carbon dioxide. The calcium oxide then reacts with the silicon dioxide to form calcium silicate, also known as slag. This slag is less dense than the molten iron and so it floats on top of the iron, where it can be easily removed.
So, the main purpose of adding limestone to the blast furnace is to remove silicon dioxide from the iron ore.
Similar Questions
The limestone used in the blast furnace during the extraction of iron I produces carbon dioxide II produces carbon monoxide III removes silica as a slagAI, II and IIIBI and III onlyCII and III onlyDIII only
What is the purpose of feeding a mixture of iron oxides with limestone into the blast furnace?1 mark To reduce the temperatureTo remove acidic impuritiesTo supply heatTo increase efficiency
What substance is decomposed into CO2 and CaO in the blast furnace?1 markCokeLime stoneCarbonCarbon dioxide
Explain the calcination of limestone.
describe the essential reactions in the blast furnace where each of the four raw materials (iron ore which is hematite, limestone which is calcium carbonate, carbon in the form of coke, air)
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