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Magnesium oxide is often used as the lining in steel making furnace, Explain.

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Magnesium oxide is often used as the lining in steel making furnace, Explain.

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MgO acts as a basic flux and removes certain acidic impurities present in steel in the form of slag. 

MgO + SiO2  →  MgSiO3 ; 3MgO + P2O5 → Mg3(PO4)2

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