Question

In iron extraction, the roasting is adopted though there is no having any sulfide because.
A) Hematite is to be decomposed.
B) All $FeO$ is to be converted into $F{e_2}{O_3}$.
C) All $F{e_2}{O_3}$ is to be converted into $FeO$.
D) Slag formation is encouraged.

Answer 1

Hint: We know that the most common ore of iron is hematite. Roasting may be a preliminary operation to chlorination. Sulphur, arsenic and other volatile substances existing within the ore are removed by roasting. Some basic sulphates always remain decomposed. Hence, roasting of iron ore is completed to decompose hematite.

Complete step by step answer:
Roasting is the method in which the concentrated ore is heated in a blast of air and ore gets converted into oxide and impurities like sulphur, arsenic also are oxidized to their oxides and removed, is named roasting. It requires very heat and specialized furnaces like Bessemer or reverberatory furnaces. In case of Fe, roasting is required to convert $FeO$ into $F{e_2}{O_3}$ and formation of slag is prevented by this as only $FeO$ forms slag not $F{e_2}{O_3}$.
Therefore, the option A is correct.
Extraction of iron:
Extraction of iron from its ore is the third and thus the penultimate process within the Metallurgy. The extraction of metals and its isolation occurs over a few of major steps,
Concentration of Ore
Extraction of metal from concentrated Ore
Purification of the metal
It’s an extended process which begins with concentration through calcination roasting. Concentration removes the water and other volatile impurities like sulphur and carbonates. Limestone and Coke is mixed with concentration ore and fed into the furnace from the top. It’s within the furnace that extraction of iron occurs. The extraction of iron from its ore could also be an extended and subdued process that helps in separating the useful components from the waste materials like slag.
In the smelting step, the haematite ore is mixed with coke and limestone approximately within the ratio of $8:4:1$. This mixture is named a charge. It’s fed into the furnace from the highest and a blast of temperature as high as is given.

So, the correct answer is Option A.

Note:
We must remember that the purest kind of iron is wrought iron and it is commercially available and is prepared from cast iron by heating cast iron during a furnace lined with Haematite. Impurities pass into the slag and thus the slag later are often easily separated to yield pure iron.