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What is the role of limestone in the ext...

What is the role of limestone in the extraction of iron from red haematite?

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Lime acts as a flux. So in the removal of gangue forms fusible material, called slag.
`CaCO_3 rarr CaO` + CO_2`
`SiO_2 + CaO rarr CaSiO_3`
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MBD PUBLICATION-TRANSITION METALS (d-BLOCK ELEMENTS)-QUESTION BANK
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  2. Define the term tempering and nitriding.

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