When the ore haematite is burnt in the air with coke around $2000 K$ along with lime, the process not only produces steel but also produces a silicate slag that is useful in making building materials such as cement.

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Solution

Haematite ore has the chemical formula $F e_{2} O 3$ .
By calcination and roasting, the ferrous oxide is oxidized to ferric oxide, Then, in blast furnace, smelting is done, where it is reduced to get iron.
$F e_{2} O_{3} + C O \to 2 F e_{3} O_{4} + C O_{2}$
$F e_{2} O_{3} + C O \to F e O + C O_{2}$
$F e O + C O \to F e + C O_{2}$
In the basic Bessemer process for the manufacture of steel, the lining of the converter is made up of lime. The slag formed consists of $C a_{3} (P O_{4})_{2}$ . Phosphorous is oxidized to $P_{4} O_{10}$ which reacts with lime to form slag.
$P_{4} + O_{2} \to P_{4} O_{10}$
$6 C a O + P_{4} O_{10} \to 2 C a_{3} (P O_{4})_{2}$
(Thomas slag)

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