In froth flotation,are added to prevent metal sulphides from being wetted by water whileare added to maintain a stable froth layer.

fluxes

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stabilisers

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depressants

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collectors

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Solution

The correct options are
B stabilisers
D collectors
Froth flotation method involves the property of preferential wetting of ore and gangue particles. Collectors like pine oil when added make the surface of the ore particles water repellent.
While the stabilizers like aniline generate a sufficiently stable foam layer on the top so that the ore particles could be skimmed off easily.

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In the froth flotation process, froth stabilizers and depressants must be added

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