1.

Themainreactionsoccuringinblastfurnaceduringextractionofironfromhaematiteare ..........

Answer»

` Fe_ 2 O_3+COto2Fe+3CO _2 `
` FE O+Si O _2toFeSiO _ 2`
`Fe _2 O_3+3C to2Fe +3CO`
`CaO+Si O_ 2 toCaSiO_ 3`

SOLUTION : ` Fe_2 O_3+3 C to2 Fe+3CO`reactiondoesoccurin theblastfurnace attemperaturesabove1123 Kwhen almostall the`Fe _ 2 O _ 3` has alreadybeen reducedto Fe.Therefore,it is notthe mainreaction. Further,` CaCO_3`decomposesaround1123 K TOGIVE CaO. Since,belowthistemperature, FeOhasalreadybeen reducedtoFe,therefore ,`SiO_2`doesnotcombinewithFeOtoform` FeSiO _ 3`SLAG. Thus,themainreactionswhichoccur inthe blastfurnaceare(a) and(d).


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