Which of the following cannot be concentrated by electromagnetic separation?

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Chromite

Magnetite

Pyrolusite

Zinc blende

answer is D.

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Detailed Solution

When the ore's particles or its impurities have magnetic properties, electromagnetic separation is employed to concentrate the ore. This technique is used to separate the magnetic chromite, magnetite, and pyrolusite minerals from the non-magnetic gangue particles. Either froth flotation or electrostatic separation are used to concentrate zinc blende.

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