The electrical properties of minerals are the basis for electrification. The electrical properties of the two minerals are different and it is possible to conduct electrical selection. The parameters indicating the electrical properties of the mineral mainly include the dielectric constant, electrical conductivity and relative electrical resistance, electrothermal property, specific conductivity and rectification of the mineral.
The dielectric constant is represented by the symbol ε, and the larger ε indicates the better conductivity of the mineral, and vice versa. Under normal circumstances, ε > 10 ~ 12 or more belong to the conductor, can be separated by the usual high-voltage electrification, and those below this value are difficult to use conventional electrification sorting.
Generally, the mineral resistance referred to in the electric selection is the resistance when the mineral particle size is d = 1 mm, that is, the ohmic value. When the mineral resistance is less than 10 6 Ω, it indicates that the conductivity is better. If the resistance is greater than 10 6 Ω and less than 10 7 Ω, the conductivity is medium, and the resistance is greater than 10 7 Ω. The conductivity is poor and cannot be separated by conventional electric separation.
The specific conductivity of minerals is the amount of electrons flowing into or out of the ore. It is usually expressed by the ratio of the lowest voltage of the electron flow on the ore to the lowest voltage of the electrons flowing out on the graphite . The larger the value, the more electrons flow out on the mineral. The higher the voltage, the worse the conductivity.
Some minerals are only used as conductors when the high-voltage electrodes are negatively charged, while others are only used as conductors when the high-voltage electrodes are positively charged. Some minerals can be used as conductors regardless of the positive and negative of the high-voltage electrodes. Separation, this property of minerals is called rectification. The minerals that only get negative electricity are called negative rectification, such as quartz and zircon ; the minerals that only get positive charge are called positive rectification, such as calcite ; whether the electrode is positive or negative, the mineral can obtain electric charge, called full rectification. properties, such as cassiterite, magnetic iron ore.
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