Question

why is limestone added to the blast furnance in the extraction of iron from haematite​

Answer 1

Iron is extracted from its ore, haematite, in a blast furnace. The ore is fed into the top of the furnace along with coke and limestone. ... The limestone decomposes in the hot furnace, forming calcium oxide. This reacts with the sandy impurities (silicon dioxide) to form a slag.....

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Answer 2

Iron is extracted from its ore, haematite, in a blast furnace. The ore is fed into the top of the furnace along with coke and limestone.The limestone decomposes in the hot furnace, forming calcium oxide. This reacts with the sandy impurities (silicon dioxide) to form a slag like calcium silicates (CaSiO ), which float to the top or sink to the bottom of the molten iron. Thus, CaCO3 is used to remove the impurities.

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