Blast Furnace

Question 1

1. Near bottom of furnace, oxygen in hot air reacts with carbon in coke in highly exothermic process

Answer 1

C + O2 –> CO2 + heat

Question 2

2. The CO2 reacts with more coke and is reduced to CO

Answer 2

CO2 + C –> 2CO

Question 3

3. In the upper furnace, hematite Fe2O3 is reduced to Fe by CO

Answer 3

Fe2O3+ 3CO –> 2Fe + 3CO2

Question 4

4. Fe moves to the _____ of the furnace and melts. CO2 moves to the ___ and is removed

Answer 4

bottom; top

Question 5

5. In the middle of the furnace, limestone CaCO3 endothermically decomposes

Answer 5

CaCO3 –> CaO + CO2

Question 6

CaO reacts with SiO2 in the gangue to form form CaSiO3/slag that moves down the furnace

Answer 6

CaO + SiO2 –> CaSiO3

Question 7

What kind of iron is produced in a blast furnace? What impurities does it contain?

Answer 7

pig iron; Si, O, S, P