Mineral Separation Method - Electrical Separation

The electro-optic separation method is separated according to the electrical properties of minerals, and is divided into electrostatic separation and high-frequency dielectric separation.

A electrostatic separation

Electrostatic separation is based on the electrical properties (conductivity and capacitance) of minerals, and the separation of minerals by the different electrostatic forces (attraction and repulsive forces) that minerals receive in electrostatic fields. The ability of a mineral to conduct electricity is called the conductivity of a mineral. The conductivity of minerals depends to a large extent on the type of chemical bonds. Mineral having a metallic bond, in the structure due to the presence of free electrons, the electrical conductivity and strong; ionic or covalent bonds mineral weakly conductive or non-conductive. Conductive mineral into three: a good conductor of minerals (natural gold, natural copper, graphite, etc.), a semiconductor minerals (pyrite, galena, arsenopyrite, chalcopyrite, sphalerite, etc.), mineral non-conductor ( Quartz , feldspar , mica , calcite , gypsum , asbestos, etc.).

B dielectric separation

Dielectric separation is a method of separating minerals based on differences in the dielectric constants of minerals. Place an appropriate amount of the sample in a suitable dielectric solution and insert it into the separation electrode. Under the electric field, the mineral particles with a dielectric constant greater than the dielectric liquid are adsorbed to the electrode, and the mineral particles with a dielectric constant smaller than the dielectric liquid are Repelling, thereby separating minerals having different dielectric constants from each other. The electric field can be a low frequency electric field or a high frequency electric field. With a high-frequency dielectric separator, conductive minerals may be present in the ore sample, and in the low-frequency dielectric separation, there may be no conductive minerals, which may cause a short circuit. Commonly used dielectric fluids include carbon tetrachloride, ethanol, distilled water, and the like. Mineral separation must be achieved when the separated minerals have a dielectric constant difference greater than 2 to achieve better separation.

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