Froth flotation is for separating minerals by their surface properties, like a copper sulphide from gangue, using chemicals and air bubbles. Magnetic separation uses magnets to pull out magnetic minerals like magnetite from non-magnetic ones. You choose based on the ore’s properties: flotation for hydrophobic minerals, magnetic for magnetic ones. In our lab at college in Rajasthan, we tested local iron ore—seeing the black sand stick to the drum magnet settled it better than any book explanation.
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