CN105289842A - Large column type magnetic separator of internal magnetic system - Google Patents

Abstract

The invention discloses a large column type magnetic separator of an internal magnetic system, and aims at completely using magnetic field energy of a coil, initiatively damaging magnetic flocculation and improving the separation accuracy. The magnetic separator comprises an ore feeding bucket, an ore feeding pipe, a gangue overflowing groove, an excitation and demagnetization magnetic system, a separation cavity, a water feeding drum, an ore discharge cone, a concentrate discharge pipe, a tangential water feeding pipe, an electromagnetic control device and a dispersing disc; the ore feeding bucket is arranged on the gangue overflowing groove through a support at the lower portion of the ore feeding bucket; the gangue overflowing groove is concentrically fixed through a flange and located at the upper portion of the separation cavity, and the excitation and demagnetization magnetic system is fixed inside the separation cavity through a support; and the electromagnetic control device is connected with the excitation and demagnetization magnetic system through a cable. According to the large column type magnetic separator, through shearing effects of an alternating current magnetic field, a demagnetizing field and the rotating rising water flow, the high magnetic flocculation damaging effect is achieved; and compared with other magnetic plants, same materials are selected, and the concentrate grade is higher.

Description

A Large Column Magnetic Separator with Internal Magnetic System

technical field

The invention relates to a magnetic gravity separation device, in particular to a large-scale column magnetic separator with an internal magnetic system.

Background technique

The existing magnetic separation equipment includes drum magnetic separator, magnetic desliming tank, magnetic rotary machine, magnetic aggregation machine, magnetic separation column, electromagnetic screen, etc. These existing magnetic separation equipments have certain deficiencies in the aspects of magnetic field control, separation accuracy, energy utilization rate and magnetic field action depth.

Permanent magnet magnetic separation equipment such as drum magnetic separator, magnetic desliming tank and magnetic concentrator are excited by hard magnetic materials to generate permanent magnetic field. The advantage is that there is no need for electric energy excitation, thus saving energy, but the magnetic field is a constant value, and its presence and size cannot be controlled, causing magnetic particles to easily form magnetic agglomerations and flux linkages in the sorting space, and these magnetic agglomerations and flux linkages are difficult to redisperse The opportunity to open, causing some non-magnetic particles to be entangled in it, and then mixed into the magnetic product, the higher the field strength of the excitation magnet block of the magnetic system, the more serious the magnetic agglomeration phenomenon, the result is that the quality of the concentrate is lower, so the separation of permanent magnet equipment The selection accuracy is low, and it is difficult to meet the technical requirements of modern smelting. Therefore, permanent magnet magnetic separation equipment can only be used for roughing or sweeping operations, and less and less selection operations are used.

Electromagnetic separation equipment such as magnetic separation column and electromagnetic screen adopt electric energy excitation. The first advantage is to overcome the problem that the permanent magnetic field cannot control the presence and size, and the second is to take certain measures to destroy the magnetic agglomeration and improve the quality of the concentrate. For example, the concentrate and tailings flow relatively, and the intermittent power supply temporarily loosens the magnetic agglomeration , strengthen the water flow shear to destroy the magnetic agglomeration and so on.

Electromagnetic magnetic separation equipment has made great progress compared with permanent magnet magnetic system magnetic separator, but the number of times of destroying magnetic agglomeration is small, and it has no active effect of breaking up magnetic agglomeration, and the degree of damage to magnetic agglomeration is not strong enough.

In addition, the magnetic systems of current electromagnetic equipment are all located outside the sorting area, but the magnetic field generated by the magnetic system is distributed around the magnetic system, so that only one side of the magnetic field has a sorting effect. The obvious disadvantage is that the magnetic field generated by the magnetic system can only be used On the one hand, the sorting area is small, and the energy utilization rate of the magnetic system is low, that is, there is a certain degree of magnetic flux leakage outside the sorting space. Even if some equipment is equipped with armor to reduce magnetic flux leakage, it cannot completely avoid magnetic flux leakage, especially Where the radius of curvature such as the edges and corners of the armor is small, the relative magnetic force lines are concentrated, and the magnetic flux leakage is serious; there is an air gap between the electromagnetic magnetic system and the sorting space, and the air reluctance is relatively large, which will cause the magnetic field to decay rapidly, and the effectively used magnetic energy will be further consumed; The magnetic field of the electromagnetic system is small, and the depth of the magnetic field is insufficient, especially for the electromagnet magnetic system with an iron core. The strength of the magnetic field will decay rapidly, so the depth of the magnetic field is small, which will cause the separation space to be limited. For example, some electromagnetic magnetic separation equipment needs to use occupying devices to fill the space with low magnetic field effect, which wastes the space used by the equipment. At the same time, the magnetic system Insufficient depth of action also seriously restricts the progress of large-scale magnetic separation equipment for electromagnetic excitation.

Contents of the invention

The invention provides a large-scale column-type magnetic separator with an internal magnetic system, which aims to fully utilize the magnetic field energy of the coil, actively destroy magnetic agglomeration and improve the separation accuracy.

A large-scale column magnetic separator with internal magnetic system, the magnetic separator includes: ore feeding hopper, ore feeding pipe, tailings overflow tank, excitation and demagnetization magnetic system, separation chamber, water supply drum, ore discharge cone, fine The ore discharge pipe, the tangential water supply pipe, the electromagnetic control device and the dispersing plate, the ore feeding hopper is placed on the tailings overflow chute through the bracket at the lower part, and the ore feeding pipe is connected to the ore feeding pipe through the flange under the ore feeding hopper. The axial center of the ore pipe is aligned, placed in the middle and upper part of the separation chamber, and the lower part of the mine pipe is bolted to fix the dispersing disc; the tailings overflow tank is concentrically fixed by a flange, located at the upper part of the separation chamber, and the separation The lower part of the chamber is connected to the water supply drum by the flange, and the tangential water supply pipe is welded tangentially on the outside of the water supply drum. The excitation and demagnetization magnet systems are fixed inside the sorting chamber through brackets, and the excitation and demagnetization magnet systems are aligned vertically and axially to the center; the electromagnetic control device is connected to the excitation and demagnetization magnet systems through cables.

The excitation and demagnetization magnetic systems are composed of excitation coils or electromagnets.

The electromagnetic magnetic system of the present invention is located in the sorting space, and the sorting space is composed of two parts, the inner space of the magnetic system and the outer space of the magnetic system, and the two sides are connected. The electromagnetic magnetic system is composed of several groups of independent electromagnetic magnetic systems, and adopts independent coordinated control excitation mode. Several groups of DC excitation coils in the magnetic system generate intermittent magnetic fields that periodically change and supply power downward sequentially; several groups of AC and demagnetization coils generate Higher frequency and alternately weakened fast switching and demagnetizing magnetic fields. The lower part of the sorting space is provided with a water supply drum, and the water supply enters into the sorting space tangentially, forming a rotating upward water flow in the sorting space. The combination of alternating magnetic field, demagnetizing field and tangential water flow can strongly destroy the magnetic agglomeration.

Compared with the existing similar devices, the present invention has remarkable beneficial effects as follows:

1. High energy utilization rate. The set magnetic system is placed inside the sorting area, all the magnetic fields act on the sorting space, there is no magnetic flux leakage, and the magnetic energy is fully utilized.

2. High sorting precision. Suitable for selection operations of magnetic materials. The shearing effect of AC magnetic field, demagnetizing field and rotating rising water flow has a strong effect of destroying magnetic agglomeration. Compared with other magnetic separation equipment, the same material is selected, and the concentrate grade is higher.

3. Energy saving. There are no moving parts, and the mechanical loss is small; the separation area can be doubled without increasing the excitation current.

4. Save water. The AC magnetic field and the demagnetizing field are used to act on the sorting space, which has a strong destructive effect on the magnetic agglomeration, can reduce the dependence on the rotating tangential water flow, and can significantly reduce the water consumption under the same damage degree of the magnetic agglomeration.

5. Conducive to large-scale. The existing magnetic separation equipment only utilizes the single-side magnetic field of the magnetic system, and the depth of magnetic field action limits the sorting space. The entire magnetic field of the magnetic system in the present invention is the sorting space, and the size of the sorting space is doubled to realize large-scale utilization.

Description of drawings

Figure 1 is a structural schematic diagram of a large-scale column magnetic separator with an internal magnetic system.

Numbers in the picture: ore hopper 1, ore pipe 2, tailings overflow tank 3, excitation and demagnetization magnetic system 4, separation chamber 5, water supply drum 6, ore discharge cone 7, concentrate discharge pipe 8, cutting To the water supply pipe 9, the electromagnetic control device 10, and the dispersion disc 11.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, a large-scale column type magnetic separator with an internal magnetic system, the magnetic separator consists of a feeding hopper 1, a feeding pipe 2, a tailings overflow tank 3, an excitation and demagnetization magnetic system 4, and a separation chamber 5. Consists of water supply drum 6, ore discharge cone 7, concentrate ore discharge pipe 8, tangential water supply pipe 9, electromagnetic control device 10 and dispersion disc 11. The ore feed hopper 1 is placed in the tailings through its lower bracket The upper part of the overflow tank 3 and the lower part of the ore hopper 1 are connected to the ore pipe 2 through flanges. The axial center of the ore pipe 2 is aligned and placed in the middle and upper part of the separation chamber 5. The lower part of the ore pipe 2 is used to fix the dispersion plate with bolts. 11. The tailings overflow tank 3 is concentrically fixed by flanges and is located on the upper part of the sorting chamber 5. The lower part of the sorting chamber 5 is connected to the water supply drum 6 by the flange, and the tangential water supply pipe is welded tangentially on the outside of the water supply drum 6. 9. The bottom of the water supply drum 6 is connected to the ore discharge cone 7 through a flange, and the concentrate discharge pipe 8 is welded at the center of the lower part of the ore discharge cone 7; the excitation and demagnetization magnetic system 4 is composed of an excitation coil or an electromagnet. The bracket is fixed inside the sorting chamber 5, and the excitation and demagnetization magnetic systems 4 are assembled vertically and axially centered; the electromagnetic control device 10 is connected to the excitation and demagnetization magnetic systems 4 through cables.

Working process of the present invention is as follows:

The surrounding magnetic field action space of the excitation and demagnetization magnetic system 4 is the sorting area, that is, the sorting chamber 5 . The sorting material and medium enter the ore feeding pipe 2 from the ore hopper 1, and there is a dispersion plate 11 at the lower part of the ore feeding pipe 2, from which the sorting material and medium enter the middle and upper part of the separation chamber, and are dispersed in the middle and upper part of the separation chamber. And demagnetization magnetic system 4 in the excitation coil or electromagnet generated by the sequentially downward, periodically changing magnetic field and gravity, the magnetic particles move downward, the non-magnetic particles in the water supply drum 6 and the tangential water supply pipe 9 to feed the rotation up Under the action of water flow, it gradually moves to the top tailings overflow tank 3 for discharge. During the falling process of the magnetic particles, magnetic agglomeration and flux chains will be generated under the action of the excitation magnetic system, including single magnetic particles, connected particles, and a certain amount of non-magnetic particles entrained in them. These magnetic agglomerations, flux chains Will get a chance to scatter during the descent. The main role of breaking up the magnetic agglomeration and flux linkage is the demagnetization magnetic system in the excitation and demagnetization magnetic system 4, and the shearing and breaking up of the tangential water flow during the power-off process of the excitation magnetic system, so that non-magnetic particles and poor connected organisms have opportunities Get rid of magnetic agglomeration and magnetic linkage, and regain the chance of being brought into the tailings overflow tank 5 by the rising water flow. Such repeated demagnetization and excitation power-off will strongly destroy the magnetic agglomeration and magnetic linkage, so as to achieve the requirement of improving the separation accuracy and obtain high-grade concentrate. The control of the magnetic system is realized by the electromagnetic control device 10, which can control the coils or electromagnets in the excitation and demagnetization magnetic system 4 at any position and number, and set the AC and DC excitation magnetic field and demagnetization magnetic field as required, as well as their magnetic field strength and effect. The number of times can also control the magnetic field operation cycle. Finally, the magnetic particles and rich conjoint particles move to the ore discharge cone 7 and are discharged through the concentrate discharge pipe 8 to form concentrate products.

The present invention can form a variety of embodiments according to the different numbers of coils in the excitation and demagnetization magnetic system 4 or the different functions of the coils in different positions.

Claims (2)

1. A large-scale column type magnetic separator with internal magnetic system, characterized in that the magnetic separator includes: ore feeding hopper, ore feeding pipe, tailings overflow tank, excitation and demagnetization magnetic system, separation chamber, water supply drum, The ore discharge cone, the concentrate discharge pipe, the tangential water supply pipe, the electromagnetic control device and the dispersion plate, the ore feed hopper is placed on the tailings overflow tank through the bracket at the lower part, and the bottom of the ore feed hopper is connected by a flange The ore feeding pipe is aligned with the axial center of the ore feeding pipe, placed in the middle and upper part of the separation chamber, and the lower part of the ore feeding pipe is fixed with a bolt to disperse the disc; the tailings overflow tank is concentrically fixed by a flange and is located in the separation chamber The upper part of the separation chamber and the lower part of the sorting chamber are connected to the water supply drum by a flange, and the tangential water supply pipe is welded tangentially on the outside of the water supply drum. Position; the excitation and demagnetization systems are fixed inside the sorting chamber through brackets, and the excitation and demagnetization systems are aligned vertically and axially in the center; the electromagnetic control device is connected to the excitation and demagnetization systems through cables. 2. A large-scale column magnetic separator with internal magnetic system according to claim 1, characterized in that the excitation and demagnetization magnetic systems are composed of excitation coils or electromagnets.