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_____________ is a flux used in iron smelting.

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_____________ is a flux used in iron smelting.

(a) Silica

(b) Caesium

(c) Dolomite

(d) Mica

This question was addressed to me in an online quiz.

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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