in the blast furance reducation of iron oxides take place at different temperature reanges as shown below.
at 500-800 k
`3Fe_(2)O_(3)+Coto 2Fe_93)O_(4)+CO_(2)`
`Fe_(3)O_(4) +4 CO to 3 Fe+4 CO_(2)`
`Fe_(2) O_(3) +Co to 2FeO+CO_(2)`
At 900-1500 K
`C+CO_(2) to 2CO`
`FeO+CO to Fe+CO_(2)`
`C+O_(2) to CO_(2)`
Above 1570 K
FeO+ to Fe+Co
`CaCO overset(Delta)to Cao +CO_(2)`
`CaO _SIO_(2) to caAIO_(3) (slag) `
the following reactions occur in the blast furnace :
(a) In zone of combustion ,
`C+O_(2)to CO_(2)ltDeltaH=- 393.3 kj `
(b) In zone of heat absorpition ,
`CO_(2)+Cto 2CO,Delta H =+ 163 .2 kj`
(c ) in zone of slag formation ,
`CaCO_(3) to CaO+CO_(2) `
`CaO+Sio_(2) tounderset(("slag"))underset( "Calcium silicate") CaSiO_(3) `
(d) in zone of reducation ,
`Fe_(2)O_(3) +CO overset(823 K)to 2FeO+CO_(2)`
`Fe_(3)O_(4) overset(823 K) 3FeO+cO_(2)`
`Fe_(2)O_(3) overset( gt1123 K) to Fe+3Co`
