Which one of the following processes makes the ore porous?

Froth floatation

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Calcination

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Smelting

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Distillation

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Solution

The correct option is B
Calcination

Calcination is a process in which concentrated ore is heated in a suitable furnace, generally much below its melting point in the limited supply of air or oxygen, which makes the ore porous and hydrated salts lose their water of crystallization. During which impurities of Sulphur and arsenic are volatilized away as oxides and thus pores are formed in ores.

In general, the output of smelting is in the molten state.

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Calcination or Roasting will be done for the products of the smelting process to remove impurities.

In the extraction of Iron from Haematite Fe₂O₃, the ore is calcinated before smelting – True or False?

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