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Why magnesium oxide is used for the lini...

Why magnesium oxide is used for the lining in steel making furnace?

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The role of magnesium oxide is to act as flux (basic) and it removes certain acidic impurities in the form of slag.
` MgO + SiO_(2) to underset("Megnesium silicate ") (MgSiO_(3))`
`3MgO + P_(2)O_(5) to underset("Magensium phosphate")(Mg_(3)(PO_(4))_(2))`
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