Define bessemerisation?

Answer:

Bessemerisation is a method in which the air is blown into the molten copper mat that is deposited in a Bessemer converter. In the final stage of smelting, the other products that remain, including FeS, are oxidized and removed as slag(FeSiO₃).

Cu₂S (Copper sulfide) is partially converted into Cu₂O (copper oxide) by the air blast, that reacts to the remaining molten copper. The chemical equation can be expressed as

2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

2Cu₂O + Cu₂S → 6Cu + SO₂