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Electrostatic Beneficiation

The electrostatic beneficiation is a dry separation process which is in the high-voltage electric field, with the role of other force fields, selecting minerals by using their different electrical properties. It can be used for non-ferrous metals, iron ore, non-metallic ores and other materials sorting. This method include the process of electrostatic separation, electrical classification, friction charged sorting, high-gradient separation, dielectric separation, electrostatic precipitation and so on.
To achieve power selected, the first problem is related to mineral properties and high-voltage electric field, mineral can serve as the conductors are magnetite, ilmenite, cassiterite, native gold, etc.non-conductive minerals are quartz, zircon, feldspar, calcite, scheelite and silicate minerals, and so on. The problem of high-voltage electric field is related to the selection of electrostatic separation equipment, there are many types of electrostatic separation equipments, and we should select different gravity separation process according to the nature of the ore and requirements of the product.

Electrostatic Separation Sorting Process:

(1) As the high voltage power (negative) supply corona and electrostatic pole, due to the diameter of corona electrode is small, when the voltage rises to a certain extent, the corona will release a large number of electrons.
(2) These electrons will ionize air molecules, positive ions fly to the negative pole, and negative ions fly to the ground electrode, all of the space near the roller side with a negative charge. Mineral particles come into the field with the drum, the conductor and the non-conductor are all given negative charge. Conductors' charge is transferred rapidly by the drum, while impacted by the induction role of the electrostatic field. Nearing by the drum, the mineral particles are inducing the negative charge, and then pass it away, leaving only a positive charge.
(3) As opposites attract, mineral particles are attracted to the steering electrode, combined with gravity and centrifugal force, resulting in conductor mineral particles falling from the front roller, become the concentrate.
(4) As non-conductor interface resistance, received negative charge is adsorbed on the surface of the drum and difficult to pass away, it was taken to the rear of drum and brushed down to become tailings.
(5) Minerals whose conductivity between conductors and non-conductor fall into the medium mine.

Other Beneficiation Methods

Cyanidation
Flotation Beneficiation
Gravity Separation Beneficiation
Magnetic Separation
Roasting
Wet Separation