1)What is the role of the hot air blasts in the blast furnace
2)Why is it possible to separate the iron from slag
3)Write an equation for the reaction that takes place to produce iron
4)Explain why iron produced in the blast furnace has to be given further treatment before it is used for building of bridges
5)What is meant by galvanising of iron
6)Why is it necessary to galvanize iron
7)Give two uses of each of the following types of iron:
a)Cast iron
b)Wrought iron
c)Steel
1) The hot air blasts in the blast furnace help to raise the temperature inside the furnace to extreme levels, allowing the iron ore to be reduced to iron metal through the process of smelting.
2) The iron can be separated from the slag because iron has a higher density and sinks to the bottom of the furnace, while the slag, which is the impurities from the iron ore, floats on top and can be easily removed.
3) The reaction that takes place to produce iron in a blast furnace is:
Fe2O3 + 3CO → 2Fe + 3CO2
4) Iron produced in the blast furnace has to undergo further treatment, such as refining and alloying, to improve its strength, ductility, and other mechanical properties before it can be used for building bridges.
5) Galvanising of iron is the process of coating iron or steel with a protective layer of zinc to prevent rusting and corrosion.
6) It is necessary to galvanize iron to protect it from rusting and corrosion when exposed to moisture and other corrosive elements in the environment.
7)
a) Cast iron is used for making cookware, pipes, and engine blocks.
b) Wrought iron is used for making fences, gates, and decorative items.
c) Steel is used for making buildings, bridges, cars, ships, and machinery.