Which substance is used as a flux to remove a | vedclass

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(B) In metallurgy,a flux is added to remove gangue (impurities) from the ore. If the impurity is acidic (e.g.,$SiO_2$),a basic flux is used. If the im

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Limestone

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(B) In metallurgy,a flux is added to remove gangue (impurities) from the ore. If the impurity is acidic (e.g.,$SiO_2$),a basic flux is used. If the impurity is basic (e.g.,$FeO$),an acidic flux is used. Limestone $(CaCO_3)$ acts as a basic flux because it decomposes to form calcium oxide $(CaO)$,which reacts with acidic silica $(SiO_2)$ to form slag $(CaSiO_3)$: $CaCO_3 \rightarrow CaO + CO_2$ $CaO + SiO_2 \rightarrow CaSiO_3$ (slag). Therefore,limestone is used to remove acidic impurities.

Which substance is used as a flux to remove acidic impurities in metallurgy?

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