Exercise IV

In blast furnace, pure hematite  is reduced by . To ensure complete reduction, an excess  is used. CO is obtained by combustion of carbon with air.

The following chemical reaction occurs
 

Ratio of  in the exit gas mixture is 1.7:1 by volume; the furnace produces 2000 tons of iron per day.

Calculate:

1. Value of x in the equation.
2. Volume of  and  produced daily.
3. Consumption of coke per day when C of coke is 88%.
4. Blast of air for combustion of carbon in coke per day.
5. Revised ratio of  in the exit gas when pure   charged is 25% of the reduced. Assume that   decomposes to .

Solution:

 kg moles (a)

 
                                        (b)

Coke required     tone.                                                    (c)

Air for combustion of  | mole Fe             (d)

 Moles of   reduced kg moles

Limestone charged kg moles.