Water-saving and electricity-saving magnetic separation column and magnetic separation method

Abstract

The invention relates to a water-saving and electricity-saving magnetic separation column and a magnetic separation method, the water-saving and electricity-saving magnetic separation column comprises an ore feeder, a separation cylinder, a swirler, a tailing discharge chute and a permanent magnet layer, the bottom of the ore feeder is connected with the separation cylinder through a connecting pipe, the upper position of the separation cylinder is connected with the tailing discharge chute, and the discharge end of the tailing discharge chute is connected with the swirler; an overflow port of the cyclone is connected with the bottom of the separation cylinder; and a plurality of permanent magnet layers are fixed in the sorting cylinder and are longitudinally spaced by a certain distance. The permanent magnet generator has the advantages that the permanent magnet layer surrounding intermittently is adopted and is composed of permanent magnets, an electromagnetic system is not used, and electric energy is saved. Overflow of the swirler is fed into the separation cylinder, settled sand of the swirler is directly discharged as tailings, the purpose of separation is achieved, meanwhile, the overflow of the swirler is effectively utilized for supplementing water for the separation cylinder, and water for the magnetic separation column is saved.

Description

Technical Field

[0001] The invention belongs to the field of iron ore magnetic separation equipment, and in particular relates to a water-saving and electricity-saving magnetic separation column and a magnetic separation method. Background Art

[0002] The magnetic separation column is an electromagnetic weak magnetic field magnetic gravity separation and washing equipment, which is used for the selection operation of iron ore beneficiation plants. The electromagnetic magnetic system adopts an intermittent DC pulse power supply method, so that the coil magnetic field is sometimes present and sometimes absent. The upper, middle and lower coils of the magnetic separation column are energized in sequence to form a magnetic field that moves downward in sequence. The longer the cycle, the longer the interval between the two sets of coils, the stronger the flushing and dispersion effect of the rising water flow, and the more beneficial it is to improve the grade of the concentrate. In general, the magnetic field conversion cycle is 6.5s, and the magnetic field strength and magnetic field conversion cycle are usually adjusted together. For example: Patent application number: CN201822075432.5, a truncated cone magnetic separation column disclosed; Patent application number: CN201120406945.5, a magnetic separation column disclosed.

[0003] Magnetic separation columns generally require a lower feed concentration, so water needs to be added to dilute the iron ore slurry to 20-30% before it enters the magnetic separation column for diluted magnetic separation. On average, a magnetic separation column requires 80-200 cubic meters of water per hour, which is a large amount of water. Summary of the invention

[0004] The purpose of the present invention is to provide a water-saving and electricity-saving magnetic separation column and magnetic separation method, which can save water while ensuring the grade of iron concentrate, and at the same time, permanent magnets are used to replace excitation coils to reduce power consumption.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A water-saving and power-saving magnetic separation column comprises a feeder, a separation drum, a cyclone, a tailings discharge trough and a permanent magnet layer. The bottom of the feeder is connected to the separation drum through a connecting pipe, the separation drum is connected to the tailings discharge trough at the upper position, and the discharge end of the tailings discharge trough is connected to the cyclone; the overflow port of the cyclone is connected to the bottom of the separation drum; a plurality of permanent magnet layers are fixed in the separation drum, and the permanent magnet layers are longitudinally spaced a certain distance apart.

[0007] The permanent magnet layer is composed of a plurality of permanent magnets, and the permanent magnets are evenly distributed along the radial direction of the sorting barrel.

[0008] The permanent magnet is a rare earth magnet.

[0009] The magnetic induction intensity of the permanent magnet is 0.8 to 1.2 Tesla.

[0010] The bottom of the separation cylinder is fixedly connected with a magnetic concentrate discharge pipe.

[0011] The bottom of the cyclone is connected with a sand discharge pipe.

[0012] The lower part of the separation barrel is fixedly connected with a water supply pipe.

[0013] A water-saving and power-saving magnetic separation method, wherein ore slurry with a concentration of 14% to 18% is fed from a feeder to a separation drum, passes through multiple permanent magnetic layers, and magnetic concentrate is discharged from the bottom of the separation drum. Tailings with weaker magnetism enter the tailings discharge trough from the top along the gap between the center of the separation drum and the drum body. Tailings with high density pass through a cyclone and are discharged from a sand settling discharge pipe at the bottom. The overflow port at the top of the cyclone is fed into the water supply pipe of the separation drum through a conduit as supplementary water.

[0014] After the slurry enters the center of the separation drum, it moves downward due to its own gravity, tumbling and dispersing inside the separation drum. Since the permanent magnetic layer generates a magnetic field at a certain longitudinal interval, the magnetic field is a fixed magnetic field. Under the combined action of the upward rising water flow, the fixed magnetic field and gravity, the particles with high magnetism will be discharged downward through the magnetic concentrate discharge pipe, and the particles with low magnetism will flow upward into the tailings discharge trough for discharge.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) The separation cylinder of the water-saving and electricity-saving magnetic separation column adopts an intermittently surrounded permanent magnetic layer, which is composed of permanent magnets and does not use an electromagnetic magnetic system, saving electricity.

[0017] 2) The tailings discharge trough of the present invention is connected to the hydrocyclone, the hydrocyclone overflow is fed into the separation drum, and the hydrocyclone sedimentation is directly discharged as tailings. While achieving the purpose of separation, the hydrocyclone overflow is effectively used to replenish water for the separation drum, saving water for the magnetic separation column. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] In the figure: 1-feeder 2-tailings discharge chute 3-cyclone 4-separation drum 5-permanent magnetic layer 6-overflow pipe 7-magnetic concentrate discharge pipe 8-sand discharge pipe 9-water supply pipe. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0021] See Figure 1A water-saving and electricity-saving magnetic separation column comprises a feeder 1, a separation drum 4, a cyclone 3, a tailings discharge trough 2, and a permanent magnetic layer 5. The bottom of the feeder 1 is connected to the separation drum 4 through a connecting pipe, the separation drum 4 is connected to the tailings discharge trough 2 at the upper position, and the discharge end of the tailings discharge trough 2 is connected to the cyclone 3; the overflow port of the cyclone 3 is connected to the bottom of the separation drum 4; a plurality of permanent magnetic layers 5 are fixed in the separation drum 4, and the permanent magnetic layers 5 are longitudinally spaced a distance apart to form a longitudinally discontinuous magnetic field.

[0022] The permanent magnet layer 5 is composed of a plurality of permanent magnets, which are evenly distributed along the radial direction of the separation barrel 4. The permanent magnets are rare earth magnets, and the magnetic induction intensity of the permanent magnets is 0.8 to 1.2 Tesla.

[0023] A magnetic concentrate discharge pipe 7 is fixedly connected to the bottom of the separation drum 4. A water supply pipe 9 is fixedly connected to the lower part of the separation drum 4. A sand discharge pipe 8 is connected to the bottom of the cyclone 3, and the sand in the cyclone 3 is directly discharged from the sand discharge pipe 8 as tailings.

[0024] Water-saving and electricity-saving magnetic separation method:

[0025] The ore slurry with a concentration of 15%±2% is fed from the feeder 1 to the separation drum 4, and passes through multiple permanent magnetic layers 5. The high-quality magnetic concentrate is discharged from the bottom of the separation drum 4, and the tailings with weaker magnetism enter the tailings discharge trough 2 from the top along the gap between the center of the separation drum 4 and the drum body. The high-density tailings pass through the cyclone 3 and are discharged from the sand settling discharge pipe 8 at the bottom. The overflow port at the top of the cyclone 3 is fed into the water supply pipe 9 of the separation drum 4 through the conduit as supplementary water.

[0026] The sorting process is as follows: in the sorting drum 4, after the slurry enters the center of the sorting drum 4, it moves downward due to its own gravity, tumbles and disperses inside the sorting drum 4. Since the permanent magnetic layer 5 generates a magnetic field at a certain longitudinal interval, the magnetic field is a fixed magnetic field. Under the combined action of the upward rising water flow, the fixed magnetic field and gravity, the particles with high magnetism will be discharged downward through the magnetic concentrate discharge pipe 7, and the particles with low magnetism will flow upward into the tailings discharge trough 2 for discharge, thus forming sorting.

[0027] The above is a preferred implementation mode of the present invention. The basic principles, main features and advantages of the present invention are shown and described above. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. The present invention may have various changes and improvements, which all fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A water-saving and electricity-saving magnetic separation column, characterized in that: It includes a feeder, a sorting drum, a cyclone, a tailings discharge trough, and a permanent magnet layer. The bottom of the feeder is connected to the sorting drum through a connecting pipe, the sorting drum is connected to the tailings discharge trough at the upper position, and the discharge end of the tailings discharge trough is connected to the cyclone; the overflow port of the cyclone is connected to the bottom of the sorting drum; a plurality of permanent magnet layers are fixed in the sorting drum, and the permanent magnet layers are longitudinally spaced a certain distance apart.

2. The water-saving and electricity-saving magnetic separation column according to claim 1 is characterized in that: The permanent magnet layer is composed of a plurality of permanent magnets, and the permanent magnets are evenly distributed along the radial direction of the sorting barrel.

3. The water-saving and electricity-saving magnetic separation column according to claim 2 is characterized in that: The permanent magnet is a rare earth magnet.

4. The water-saving and electricity-saving magnetic separation column according to claim 2, characterized in that: The magnetic induction intensity of the permanent magnet is 0.8 to 1.2 Tesla.

5. The water-saving and electricity-saving magnetic separation column according to claim 1, characterized in that: The bottom of the separation cylinder is fixedly connected with a magnetic concentrate discharge pipe.

6. The water-saving and electricity-saving magnetic separation column according to claim 1, characterized in that: The bottom of the cyclone is connected with a sand discharge pipe.

7. The water-saving and electricity-saving magnetic separation column according to claim 1, characterized in that: The lower part of the separation barrel is fixedly connected with a water supply pipe.

8. A water-saving and electricity-saving magnetic separation method using the magnetic separation column according to any one of claims 1 to 7, characterized in that: The ore slurry with a concentration of 14% to 18% is fed from the feeder to the separation drum, and after passing through multiple permanent magnetic layers, the magnetic concentrate is discharged from the bottom of the separation drum. The tailings with weaker magnetism enter the tailings discharge trough from the top along the gap between the center of the separation drum and the drum body. The high-density tailings pass through the cyclone and are discharged from the sand settling discharge pipe at the bottom. The overflow port at the top of the cyclone is fed into the water supply pipe of the separation drum through the conduit as supplementary water.

9. A water-saving and electricity-saving magnetic separation method according to claim 8, characterized in that: After the slurry enters the center of the separation drum, it moves downward due to its own gravity, tumbling and dispersing inside the separation drum. Since the permanent magnetic layer generates a magnetic field at a certain longitudinal interval, the magnetic field is a fixed magnetic field. Under the combined action of the upward rising water flow, the fixed magnetic field and gravity, the particles with high magnetism will be discharged downward through the magnetic concentrate discharge pipe, and the particles with low magnetism will flow upward into the tailings discharge trough for discharge.

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