Lead zinc ore treatment method

Because of wide variations in nature of ore,associated gangue minerals and  finess and distribution of ore particle in ores from different localities,there is no standard method of treament,flow sheets must be worked our for one particular ore.

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Generally,method of treatment maybe classified roughtly as following:

1. Jigging:

(a) Concentration of sized material.

(b) Concentration by roughing and cleaning.

2. Table concentration:

(а) Concentration of different classifier sand products on separate tables.

(b) Concentration by roughing and retreatment of concentrate and middling products.

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3. Flotation:

(a) Following gravity concentration; flotation of primary slimes, of screen undersize from sizing ahead of gravity concentration, or of reground middlings or tailings from gravity concentration.

(b) Straight bulk flotation producing a combined lead-zinc concentrate (when either lead or zinc occurs in very small proportion to the other).

(c) Differential or selective flotation by which the ground mill feed is first treated in a lead circuit by roughing and cleaning in one or more stages and producing finished lead concentrate, followed by reconditioning and flotation of the lead-circuit tailing to recover the zinc in one or more stages of roughing and cleaning, the zinc-circuit tailing being final tailing.

(d) Flotation of oxidized lead and zinc minerals by the use of special reagents for sulphidizing or otherwise conditioning the pulp and for stage-addition in the process, usually involving a high reagent cost.

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Floation is widely used in treating lead-zinc ores for production of high grade lead zinc concentrate.As the beneficiation cost of floation,gravity concentration also still retains a place in the flow sheet of some mills where it is employed mainly on the coarse product from primary or secondary crushing before fine grinding, either to recover quickly coarse ore particles or to make a quick reject of gangue minerals, thus reducing the amount of material that must pass to expensive fine grinding.

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Various combinations of these methods of concentration are employed to suit different ores.