Mineral Processing

Separation Equipment

The flotation method is based on the difference in the physical and chemical properties of the mineral surface, processed by the flotation agent, and the mineral is selectively attached to the bubbles to achieve the purpose of separation. Non-ferrous metal ores, such as copper, lead, zinc, sulfur, and molybdenum, are mainly treated by flotation. Some ferrous metals, rare metals, and some non-metallic ores, such as graphite ore and apatite, are also selected by flotation.
In the flotation process, flotation agents are added to the ore pulp to improve and adjust the floatability of the minerals. Many minerals without natural floatability are changed from non-floatable to floatable after the action of flotation agent, or vice versa. In order to artificially control the floatability of minerals. So some people say that flotation reagents are the mainstay of flotation technology, which makes sense. The development of flotation agent is inseparable from the development of flotation process.

Magnetic separation is widely used in the selection of ferrous metal ores, the selection of non-ferrous and rare metal ores, the recovery of media in heavy media beneficiation, the removal of iron-containing impurities from non-metallic mineral raw materials, the discharge of iron objects to protect the crusher, and the smelting The steel slag produced recovers scrap steel and removes pollutants from production and domestic sewage.

Types of magnetic separator
At present, there are many types of magnetic separators used at home and abroad, and the classification methods are different. According to different characteristics, there are the following classification methods.

(1) According to the magnetic source of magnetic separator, it can be divided into permanent magnetic separator and electromagnetic magnetic separator.
(2) According to the strength of the magnetic field, it can be divided into:
① Weak magnetic field magnetic separator, the magnetic field intensity on the surface of the magnetic pole Ho = 72 ~ 136 kA/m, and the magnetic field force HgradH = (2. 5 ~ 5.0) × 1011 A2/m3;
②Medium magnetic separator, the magnetic field intensity on the surface of the magnetic pole Ho =160~480 kA/m;
③ Magnetic separator with strong magnetic field, the magnetic field intensity on the surface of the magnetic pole Ho = 480~1600 kA/m, and the magnetic field force HgradH=(1.5~6.0) × 1013 A2/m3.
(3) According to the selection process, the medium can be divided into dry magnetic separator and wet magnetic separator.
(4) According to the type of magnetic field, it can be divided into constant magnetic field, pulsating magnetic field and alternating magnetic field magnetic separator.
(5) According to the shape and structure of the machine body, it is divided into belt magnetic separator, drum magnetic separator, roller magnetic separator, disc magnetic separator, ring magnetic separator, cage magnetic separator and pulley magnetic separator .

Among them, it is mainly distinguished by the strength of the magnetic field and the structure type of the selected medium:

  • The weak magnetic separator is mainly used to sort strong magnetic minerals, such as magnetite, titanomagnetite, ferrosilicon. In the past, most of the industries were electromagnetic magnetic systems, and the shape of the body was mostly cylindrical and belt. At present, most of them are permanent magnetic systems and cylindrical shapes, and the wet type is widely used.
  • In the past, in the field of strong magnetic separators at home and abroad, dry magnetic separators with coarser particle size were mainly used to select non-ferrous metals and rare metal minerals. In the past ten years, in order to select low-grade, fine-grained weak magnetic For minerals, various types of wet strong magnetic separators have been developed, such as ring type, cage type, and disc type.
  • The medium magnetic separator is mainly used to sort the locally oxidized strong magnetic ore.

According to the different conductivity of ore minerals and gangue mineral particles, the method of sorting in high voltage electric field.

The electrical properties of minerals are the basis for electrical separation. The electrical properties of the two minerals are different, so that electrical separation is possible. The parameters representing the electrical properties of minerals mainly include the dielectric constant, electrical conductivity and relative resistance, electrothermal property, specific conductivity and rectification of minerals.

The specific electrical conductivity of a mineral is the amount of electrons flowing out of or flowing out of the ore particles. It is often expressed by the ratio of the lowest voltage of the electron flow on the ore particles to the lowest voltage of the electron flow on the graphite. The higher the outgoing voltage, the worse the conductivity.

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