1.

What is flux ? Nameanacidflux.

Answer»

Solution :FLUX is asubstancethat combineswithgangue (earthlyimpurities) which may still be presentintheroastedor thecalcinedore to forman easilyfusiblematerialcalledtheslag. Forexample,
(i) Intheblastfurnace in themetallurgyof iron, CaO actsas THEBASIC flux. It removesthe acitic IMPURITY of`SiO_2 ` presentin theore toform fusiblecalciumsilicate slag
` underset ("Basic flux")(CaO(s))+underset ("Acidic impurity")(SiO_2(s)) overset (1123 K)toCaSiO_3(slag) `
(ii) Copperisextractedfromcopperpyrites. Roastingof COPPER pyrites mainlygives ` Cu_2 S and FeO`. Toremovebasic FeO, silica`(SiO_2) `is usedas theacidicflux whichcombines withFeO to formfusicles ferrous silicateslag.
`underset ("Basic impurity")(FeO) +underset ("Acidic flux")(SiO_2) tounderset ("Ferrous silicate (slag)")(FeSiO_3) `


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