Question

Cassiterite is concentrated by:
(A) Froth Flotation Process
(B) Magnetic Separation
(C) Distillation method
(D) Calcination method

Answer 1

Hint : In order to this question, to know the exact method of removing impurities or the method to concentrate the Cassiterite, we should go through the type of impurities it contains, and on the basis of impurities, we can choose the correct method.

Complete Step By Step Answer:
Cassiterite is concentrated by magnetic separation method or we can say electro-magnetic separation method.
Magnetic separation is the process of separating components of mixtures by using magnets to attract magnetic materials. Non-magnetic material is separated from magnetic material using a magnetic separation technique. This technique works for a few minerals, such as ferromagnetism/ferromagnetic (materials that are strongly affected by magnetic fields) and paramagnetic (materials that are less affected but still have an effect). Not all metals are magnetic; gold, silver and aluminium are some examples.
Magnetic materials are separated using a wide range of mechanical methods. Magnets are placed inside two separator drums that contain liquids during magnetic separation. Magnetic particles are drifted by the movement of the drums due to the magnets. This may result in the formation of a magnetic focus (e.g. an ore concentrate).
Hence, the correct option is (B).

Note :
Gravity separation and magnetic separation can also be used to benefit Cassiterite (tinstone). When most of the lighter gangue particles are removed, the ore is crushed to a fine powder and concentrated by gravity separation by washing with a current of water. Gravity isolation does not exclude wolfram, which has the same density as tinstone.