The re-election method separates minerals based on their relative density (usually called specific gravity). Mineral particles of different densities are subjected to hydrodynamic forces and various mechanical forces in the moving medium (water, air and heavy liquids), resulting in suitable loose stratification and separation conditions, so that different density of ore particles are separated.
2. Flotation
The flotation method is based on the difference in the physical and chemical properties of the mineral surface, and is treated with a flotation agent so that useful minerals are selectively attached to the air bubbles to achieve separation.
Non-ferrous metal ore beneficiation, such as copper, lead, zinc, sulfur, molybdenum, etc., is mainly treated by flotation; some ferrous metals, rare metals, and some non-metallic ores, such as graphite ore, apatite, etc. are also used for flotation. Method selection.
3. Magnetic separation
The magnetic separation method is based on the difference in mineral magnetic properties. Different minerals receive different forces in the magnetic field of the magnetic separator and are thus classified. It is mainly used for the selection of ferrous metal ores (iron, manganese, chromium); it is also used for the selection of self-lubricating bearings for colored and rare metal ores.
4. Electric method
The electoral method is based on the difference in the conductivity of the minerals. When the minerals pass through the high-voltage electric field of the electric separator, due to the different conductivity of the minerals, the electrostatic force acting on the minerals is also different, so that the minerals can be separated. Electric selection method is used for the selection of rare metals, non-ferrous metals and non-metallic ores. At present, it is mainly used for the separation and selection of mixed coarse ore concentrates, such as the separation of scheelite and cassiterite, the selection of zircon and the selection of niobium ore.
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