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Limestone is used in the preparation of ...

Limestone is used in the preparation of pig iron from haematite - why?

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`CaO` obtained on thermal decomposition of limestone `(CaCO_(3))` acts as a basic flux and reacts with the acidic gangue `(SiO_(2))` present in haematite to from the slag, calcium silicate `(CaSiO_(3))`.
`CaCO_(3)overset(Delta)rarr CaO+CO_(2)uarr ,CaO +SiO_(2)rarr CaSiO_(3)`
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE )
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