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_____________ is a flux used in iron smelting.

(a) Silica

(b) Caesium

(c) Dolomite

(d) Mica

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Asked question is from Sintering and Compacting, Pig Iron and its Manufacture topic in division Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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The correct option is (c) Dolomite

For explanation I would say: Fluxes must form slags of low viscosity and low density so that the slag will settle freely down through the charge and float in a distinct layer of iron in the hearth. Limestone or dolomite usually acts are the flux in iron smelting. The slag also helps in control of chemical properties of iron.

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