Which one of the following processes makes the ore porous-Froth floatation-Calcination-Roasting-Gravity separation

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Extraction of Moderately Reactive Metals

Which one of ...

Question

Which one of the following processes makes the ore porous?

Froth floatation

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Calcination

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Roasting

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Gravity separation

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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. This makes the ore porous and hydrated salts lose their water of crystallization. During this process the impurities of sulphur and arsenic are volatilized away as oxides and thus pores are formed in ores.

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Similar questions

State the principle for each of the following processes which are used in metallurgy in general.
(i) Roasting
(ii) Gravity separation
(iii) Froth flotation
(iv) Aluminothermy
(v) Calcination
(vi) Electromagnetic separation.

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

Q. Assertion :Roasting is a process in which the ore is heated strongly in absence of air. Reason: Concentration of sulphide ore is done by calcination.

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

Q. Compare the process of calcination and roasting.

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