explain froth floatation process?

Answer 1

Froth Flotation is a selective process for separating minerals from gangue by using surfactants and wetting agents. The selective separation of the minerals makes processing complex (that is, mixed) orebodies economically feasible. The flotation process is used for the separation of a large range of sulfides, carbonates and oxides prior to further refinement. Phosphate and coal are also processed by flotation technology.

Froth flotation commences by comminution, which is used to increase the surface area of the ore for subsequent processing and break the rocks into the desired mineral and gangue (which then has to be separated from the desired mineral); the ore is ground into a fine powder. The desired mineral is rendered hydrophobic by the addition of a surfactant or collector chemical; the particular chemical depends on the mineral is being refined - as an example, pine oil is used to extract copper (see copper extraction). This slurry (more properly called the pulp) of hydrophobic mineral-bearing ore and hydrophilic gangue is then introduced to a water bath which is aerated, creating bubbles. The hydrophobic grains of mineral-bearing ore escape the water by attaching to the air bubbles, which rises to the surface, forming a foam (more properly called a froth). The froth is removed and the concentrated mineral is further refined.

Answer 2

Froth Flotation

Answer 3

Understand Froth Floatation Process. Click on the link to Watch the VIDEO explanation:
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This is a method of concentration of ores used exclusively for Sulphide ores. Principle involved is the difference in the wetting properties of the ore and the gangue particles. The sulphide ore particles are preferentially wetted by oil while gangue particles are preferentially wetted by water. A mixture of water and pine oil is taken in the tank. The powdered Sulphide ore is dropped in. Compressed air is blown in through the agitator. The agitator is rotated several times. Froth containing ore starts rising up. The impurities settle down and are let out through the outlet down at the bottom. Froth is dropped into a settling tank where the pure ore sinks to the . Thus the concentrated ore is ready for the further processing.

Answer 4

Som has it right, although in terrible specialist's language. I'll try to avoid or at least explain those terms.

A slurry of solid material -in case of mineral crushed and ground to particle sizes less than a millimeter, mixed with water - is treated with surface active chemicals (surfactants, in principle the same as detergents or soaps - one end capable of forming a weak bond to the surface, the rest presenting a hydrophobe (water repellant) rest to interact with excess surfactant, forming a lighter blob that will remain in solution).

By frothing the surfactants (blowing air into the slurry), the hydrophobe side of the particles which have surfactants attached to them will stick to the walls of the bubbles rather than remain in slurry/solution, and with all that light air they are attached to will be carried up into the froth.

Through the right choice of surfactants and surface activating agents, a selection may be made between desired minerals (which should not react with the surfactant) and undesired ones (which ought to end up in the froth).

Rarely, the process takes the product over with the froth and leaves the undesired minerals (the gangart or gang) in the main slurry, e.g. when separating quartzite (the product) from feldspar. This requires larger amounts of surfactants.

Answer 5

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Minerals have surface charges related to the makeup of the compound. Froth flotation takes advanatage of this by the addition of organic molecules with ionic functional groups that attach to the surfaces of the minerals. the type of additive depends on the nature of the target mineral. When the mineral gets coated by the organic molecule, the compound takes on a non-ionic character, and thus will tend to separate out into a non-ionic solution (following the very general idea that oil and water don't mix). A frothing agent is added to the treated slurry (the mixture of water and minerals which ahs been treated by the additive); the frothing agent has a chemistry that causes the additive-coated minerals to migrate into the froth phase, and the froth is simply skimmed off the top of the slurry to yield a product that is highly enriched in the target minerals. One can also do the inverse and add things that will make non-desirable minerals stay in the main watery phase. Basically, froth flotation is a mixture of chemical and physical separation that leads to two distinct products, one highly enriched in the target minerals and the other highly depleted in the target minerals. In practice, it is a fairly complicated process to determine which of the many possible additives, and in what amount, will give the best yields, but the actual processing is fairly simple: you crush and screen and otherwise separate minerals into a similar size class and then treat with the additive, then send this slurry into agitated vats with air injected into them to make the froth phase at the surface. Rotating paddles on the sides of the vat brush the surface froth off into gutters that collect the concentrate.

Answer 6

froth floatation procees is for purification of ores it is mainly used for sulphide . first powdered ore is taken in beaker with water and pine oil which is foaming agent . then compreesed air is passed then the ore come to surface as foam while impurities are settle at bottom of beaker.

Answer 7

Refer Chemistry text book from Deepa Publications....

Answer 8

this is related to the topic surfactants please check this out in surfactant if you not get it any other topics.