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Question

Which of the following methods are used for concentration of ores?
  1. Gravity seperation
  2. Froth floatation
  3. Roasting
  4. Calcination


Solution

The correct options are
A Gravity seperation
B Froth floatation
Concentration of ore is the process of removing unwanted impurities such as soil or clay from the ore.

Following methods are used for the concentration of ores:

Froth floatation process is used to concentrate sulphide ores. It depends on the wetting property of both ore and gangue particles. 

  Gravity separation is used for separating ore and gangue particles based on their difference in specific gravities. 

Roasting and calcination are methods used for the extraction of metals from their ore.

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