BLAST FURNACE

Question 0

What are the raw materials used in the blast furnace?

Answer 0

Hematite (iron ore)
Coke (carbon)
Limestone

Question 1

What is the purpose of the blast furnace?

Answer 1

Extraction of iron

Question 2

What is the word formula of hematite?

Answer 2

Iron (III) oxide

Question 3

What is the purpose of the coke?

Answer 3

Reducing iron oxide to iron metal

Question 4

What is the purpose of the limestone?

Answer 4

Take away impurities in the form of slag

Question 5

What is the temperature in the blast furnace?

Answer 5

1500 degrees

Question 6

What is the first reaction to take place in the blast furnace in the reduction of iron involving coke?

Answer 6

C + O2 –> CO2

Question 7

What is the second reaction to take place in the blast furnace in the reduction of iron involving the CO2 from the first reaction?

Answer 7

CO2 + C –> 2CO

Question 8

What is the second reaction to take place in the blast furnace involving the CO2 from the first reaction?

Answer 8

CO2 + C –> 2CO

Question 9

What is the third reaction to take place in the blast furnace in the reduction of iron involving carbon monoxide from the second reaction?

Answer 9

3CO + Fe2O3 –> 2Fe + 3CO2

Question 10

What is the useful component of hematite?

Answer 10

Iron (III) oxide

Question 11

What type of reaction is the first reaction in the blast furnace?
(C + O2 –> CO2)

Answer 11

Combustion reaction

Question 12

What type of reaction is the third reaction in the blast furnace?
(3CO + Fe2O3 –> 2Fe + 3CO2)

Answer 12

Redox reaction

Question 13

What is the main impurity in hematite?

Answer 13

Silicon dioxide (sand)

Question 14

What is the chemical formula of silicon dioxide?

Answer 14

SiO2

Question 15

What is the chemical formula of limestone?

Answer 15

CaCO3

Question 16

What is the first reaction in the blast furnace involved in the removal of impurities?

Answer 16

CaCO3 –> CaO + CO2

Question 17

What is the second reaction in the blast furnace involved in the removal of impurities, involving the CaO from first reaction?

Answer 17

CaO + SiO2 –> CaSiO3

Question 18

What type of reaction is the second reaction in the removal of impurities from the blast furnace?

Answer 18

Neutralisation reaction

Question 19

What is the term we use for CaSiO3?

Answer 19

Molten slag

Question 20

How do we get rid of the molten slag from the blast furnace?

Answer 20

We tap it off

Question 21

Why can we tap off the molten slag?

Answer 21

Because it is less dense than the molten iron so will form the top layer.

Question 22

Why do we need to remove the silicon dioxide from the iron?

Answer 22

Iron with silicon dioxide in it is brittle.