What is the equation of the exothermic reaction in a blast furnace?

In a blast furnace a mixture of iron oxide (Fe2O3), coke
(carbon derived from coal), and limestone are heated to produce elemental iron (Fe) plus
residual slag.

External heat is used to preheat the air
introduced into the bottom of the blast furnace but the main source of heat in the
furnace is the burning of the coke with oxygen.

C + O2
--> CO2 + heat

In addition, the CO2 reacts with some
of the coke to produce carbon monoxide (CO).  The carbon monoxide then reacts with the
iron ore to reduce it to iron.

C + CO2 -->  2
CO

Fe2O3 + 3CO --> 2 Fe + 3
CO2