CN102626671B - Magnetic field ore dressing method and ore dressing equipment - Google Patents

Abstract

The invention discloses a magnetic field mineral processing method and its mineral processing equipment. The device comprises a rotary screen cylinder, an upper screen cover and a lower screen cover are arranged at both ends of the rotary screen cylinder, the upper screen cover is connected with a motor, and a screen is provided on the upper part of the rotary screen cylinder. The side wall of the casing installed concentrically with the rotary screen cylinder is provided with a tailings discharge pipe and a concentrate discharge pipe. The lower cover, the upper cover, the upper screen cover and the feeding pipe are installed concentrically, the lower cover and the lower screen cover are installed concentrically, a coil is wound on the upper part of the shell, and the input terminal of the coil is connected with a pulsating unidirectional current. The invention realizes the effective separation of the magnetic substance and the nonmagnetic substance, and has a higher recovery rate of the magnetic substance while avoiding the inclusion of the nonmagnetic substance in the magnetic substance.

Description

Magnetic field beneficiation method and beneficiation equipment

technical field

The invention belongs to the field of mineral processing, and in particular relates to a magnetic mineral separation device and method. the

Background technique

Magnetic separation is a simple and effective method for separating magnetic and non-magnetic substances. Non-uniform magnetic field separation equipment, such as various magnetic separators, can separate different types of ores, but the magnetic substances separated are easy to be mixed with non-magnetic substances. the

The magnetic agglomeration re-separator and magnetic separation column invented according to the principle of magnetic agglomeration are sorted in an approximately uniform magnetic field environment. Its principle is to separate the agglomerated magnetic substances from the non-agglomerated non-magnetic substances by using backwash water for fluidized classification. In order to reduce inclusions, both devices design the magnetic system as discontinuous to achieve the effect of agglomeration-dispersion-agglomeration, and the non-magnetic substances can be separated by flushing water during dispersion. Although these two types of equipment can effectively reduce inclusions, fine-grained magnetic materials are easily lost under the action of recoil water. At the same time, the equipment requires a large amount of water for recoil during operation, which is not conducive to emission reduction. the

The magnetic field screening machine is another kind of magnetic separation equipment for sorting in an approximately uniform magnetic field environment invented by using the principle of the magnetic field screening method. The principle is to use a pair of symmetrically placed planar magnetic systems to form a uniform magnetic field, and the magnetic objects are magnetized in the magnetic field to form a chain, and the chain-shaped magnetic objects and loose non-magnetic objects are separated by sieving. The method and the device effectively solve the problems of large water consumption of a magnetic agglomeration re-separator and a magnetic separation column and weak recovery ability of fine-grained magnetic substances. However, when the magnetic field screening machine is used, some non-magnetic substances are mixed in the magnetic chain and cannot be separated. At the same time, the magnetic system of the magnetic field screening machine is a permanent magnetic system, and the field strength is not easy to adjust, which cannot meet various needs. the

Contents of the invention

The object of the present invention is to address the deficiencies of the above-mentioned prior art, to provide a magnetic field mineral processing method and its mineral processing equipment, to achieve effective separation of magnetic and non-magnetic materials, while avoiding the inclusion of non-magnetic materials in magnetic materials and having a higher Magnetic recovery rate. the

The technical scheme of the present invention is realized in the following manner: a magnetic field mineral processing equipment, including a rotary screen cylinder, an upper screen cover and a lower screen cover are arranged at both ends of the rotary screen cylinder, the upper screen cover is connected with a motor, and the upper part of the rotary screen cylinder is provided with a There is a screen, and the side wall of the shell installed concentrically with the rotary screen cylinder is provided with a tailings discharge pipe and a concentrate discharge pipe. The middle of the tailings discharge pipe and the concentrate discharge pipe is separated by a partition. The upper cover and the lower cover, the upper cover, the upper screen cover and the feeding pipe are installed concentrically, the lower cover and the lower screen cover are installed concentrically, a coil is wound on the upper part of the shell, and the coil input terminal is connected with a pulsating unidirectional current. the

The flushing pipe is connected with the concentrate discharge pipe. the

The input of the coil is a unidirectional current with pulsating changes

In the present invention, a coil is arranged outside the casing concentrically installed with the rotating screen cylinder, and a unidirectional current with pulsating changes is input to the coil, and the inside of the device is filled with water during operation. The pre-separated material enters the rotary screen cylinder through the feeding pipe. Under the action of the magnetic field generated by the coil, the magnetic minerals are magnetized to form a magnetic chain in the same direction as the magnetic force line and fall to the screen surface of the rotary screen cylinder. Under the action of sieving, the non-magnetic material passes through the screen and separates from the magnetic material, and the particle size of the magnetic chain formed by the magnetic material is larger than the pore size of the screen, and the material on the screen moves along the front of the screen under its own weight. The unidirectional current with pulsating change makes the pulsating change of the magnetic field intensity generated by the coil unchanged in one direction, so as to achieve the loosening process of the formed magnetic chain. After many times of agglomeration-looseness-agglomeration and continuous screening, it is divided into two products, which reach the concentrate discharge pipe and tailings discharge pipe respectively. In addition, recoil water is added to the concentrate discharge pipe to further improve the separation effect when fluidized separation is carried out in the concentrate discharge pipe.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention. the

Detailed ways

Example 1

As shown in Figure 1, the present invention includes a rotary screen cylinder 7, the two ends of the rotary screen cylinder 7 are provided with an upper screen cover 6 and a lower screen cover 11, the upper screen cover 6 is connected to the motor, and the upper part of the rotary screen cylinder 7 is provided with a screen. Tailings discharge pipe 8 and concentrate discharge pipe 10 are arranged on the side wall of casing 12 installed concentrically with rotary screen cylinder 7, and the middle of tailings discharge pipe 8 and concentrate discharge pipe 10 is separated by a partition. There is an upper cover 4 and a lower cover 1, the upper cover 4, the upper screen cover 6 are installed concentrically with the feed pipe 5, the lower cover 1 and the lower screen cover 11 are installed concentrically, and the coil 3 is wound on the upper part of the casing 12.

The current passing through the coil 3 is a unidirectional current with pulsating changes, such as a sinusoidal current. the

In the present invention, the direction of the current is always constant, which can prevent the magnetic chain produced by the magnetic substance from breaking. In addition, the magnitude of the current is constantly changing, which can make the magnetic magnitude of the magnetic substance change. In this way, the nonmagnetic substance mixed in the magnetic substance is very small. Comes off easily. the

The working process of the present invention is as follows. The feeding pipe 5 transports the pre-separated material into the rotating cylinder 7. The upper screen cover 6 of the rotating cylinder 7 is equivalent to the transmission shaft at the same time, and is connected with the motor to drive the rotating cylinder 7 to rotate. Under the action of the magnetic field generated by ring 3, the magnetic material and the non-magnetic material are separated, and the magnetic material is reunited in a chain shape. After that, the magnetic material and the non-magnetic material move forward along the inclined direction of the equipment. When passing through the screen, the diameter of the non-magnetic material is small. It can leak through the mesh holes on the screen and flow out through the tailings discharge pipe 8, while the magnetic particles formed by the magnetic particles are too large to pass through the mesh holes on the screen, and continue to advance along the inclined direction of the equipment, and finally discharge through the concentrate Tube 10 is removed to realize the separation of magnetic and non-magnetic substances. the

The overflow water of the equipment is discharged through the hollow shaft of the lower screen cover 6, and the height of the discharge outlet can be adjusted to adjust the liquid level in the sorting equipment. the

The whole equipment is installed obliquely, and the inclination angle is adjustable. The rotary screen cylinder is driven by a motor, and the speed is adjustable. The current and pulsation rules of the excitation power supply can be adjusted. The invention also has the advantages of water saving, adjustable, large processing capacity and the like. the

Example 2

The flushing pipe 9 is connected with the concentrate discharge pipe 10 . Other structures and working process are the same as embodiment 1. Compared with Example 1, the present invention can make the obtained magnetic substance more pure, and its principle is as follows: the magnetic substance coming down from the concentrate discharge pipe 10 also may contain a small amount of non-magnetic substance. At this time, the flushing pipe flushes upwards The water can make the material in the concentrate discharge pipe rise up under the drive of the water flow, return to the rotating cylinder 7, and be further separated under the action of the coil magnetic field.

Claims (3)

1. A magnetic field mineral processing equipment, including a rotary screen cylinder (7), the two ends of the rotary screen cylinder (7) are provided with an upper screen cover (6) and a lower screen cover (11), and the upper screen cover (6) is connected with a motor, The upper part of the rotary screen cylinder (7) is provided with a screen, and the side wall of the casing (12) installed concentrically with the rotary screen cylinder (7) is provided with a tailings discharge pipe (8) and a concentrate discharge pipe (10). The discharge pipe (8) and the concentrate discharge pipe (10) are separated by a partition, and the two ends of the shell are provided with an upper cover (4) and a lower cover (1), which are characterized in that: the upper cover (4), the upper screen The cover (6) is installed concentrically with the feeding pipe (5), the lower cover (1) and the lower screen cover (11) are installed concentrically, the upper part of the casing (12) is wound with a coil (3), and the input terminal of the coil (3) is connected with A unidirectional current with pulsating changes. 2. The magnetic field mineral processing equipment according to claim 1, characterized in that: the concentrate discharge pipe (10) is provided with a flushing pipe (9), and the flushing pipe (9) and the concentrate discharge pipe (10) connected. 3. The method of using the magnetic field mineral processing equipment according to claim 1 or 2, characterized in that: the input of the coil (3) is a sinusoidally changing unidirectional current.

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