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Generally the Iron ore contains Silica as main gangue material. To remove silica in the form of Slag, we add CaO or MgO as flux material. But if the ore itself have the higher content of CaO or MgO along with Silica, the ore will be SELF FLUXED and no need to add external Flux. So, the self fluxing is an advantage in the case of iron ores having CaO or MgO in gangue.

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