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PLANT FLOTATION MACHINES IN BANKS

In the mechanical flotation cells the feed can be introduced directly to the impeller zone from the side as in a Denver-style Sub A sub-aeration machine.

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A centrally located paddle-wheel type impeller generates a rotating pulp vortex which extends between two stationary elements: the sand-pipe located at the top of the cell, and the draft tube located at the bottom of the cell. The hydraulic action of this rotating vortex is to develop an internal cavity vacuum while simultaneously circulating the pulp from the bottom of the cell through the. draft tube into the rotor region. The suction developed in the vortex core draws air into the central region of the rotor which is mixed with the pulp circulated from the bottom to the cell.

Mineral flotation starts with grinding of the ore, with water and reagent, down to a chosen average grain size to secure “liberation of the discrete mineral particles. This step raises a difficult mineralogical question; as perfect liberation is rarely achievable without excessive over-grinding, what defines the economic compromise?

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