CN110801936B - Sectional dry magnetic separation device for powdery magnetic materials and application method of sectional dry magnetic separation device - Google Patents

Sectional dry magnetic separation device for powdery magnetic materials and application method of sectional dry magnetic separation device Download PDF

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CN110801936B
CN110801936B CN201911108610.2A CN201911108610A CN110801936B CN 110801936 B CN110801936 B CN 110801936B CN 201911108610 A CN201911108610 A CN 201911108610A CN 110801936 B CN110801936 B CN 110801936B
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magnetic
belt
air
blowing
separation
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CN110801936A (en
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王玉成
程宝军
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Gansu Western Heavy Industry Co ltd Of Jisco
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Gansu Western Heavy Industry Co ltd Of Jisco
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/16Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/22Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with non-movable magnets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/30Combinations with other devices, not otherwise provided for

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  • Combined Means For Separation Of Solids (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a sectional dry magnetic separation device for powdery magnetic materials and a use method thereof, belongs to the technical field of mineral separation engineering, and solves the problems of low grade of iron concentrate and low metal recovery rate in a dry magnetic separation process for the magnetic materials. According to the invention, 3-5 sorting areas are arranged above the belt side by side, each sorting area is provided with a blowing mechanism and an air draft mechanism, an air outlet of the air draft mechanism is connected with a tailing collecting device, a magnetic system is composed of a plurality of main magnetic poles, the magnetic poles are uniformly distributed along the width direction of the belt, and the magnetic field intensity from a feeding end to a discharging end along the length direction of the belt is distributed from high to low. The using method comprises the following steps: the blast volume is regulated to be sequentially increased along the movement direction of the belt; the magnetic induction intensity of the main magnetic pole is regulated to be sequentially reduced along the movement direction of the belt; and starting magnetic separation operation. The invention improves the separation efficiency, separation precision and metal recovery rate of the magnetic materials by adjusting the magnetic field intensity and blast volume in each separation area.

Description

Sectional dry magnetic separation device for powdery magnetic materials and application method of sectional dry magnetic separation device
Technical Field
The invention belongs to the technical field of mineral separation engineering, and particularly relates to a sectional dry magnetic separation device for powdery magnetic materials and a use method of the sectional dry magnetic separation device.
Background
The powdery magnetic material weak magnetic separation process is divided into two types of wet weak magnetic separation and dry weak magnetic separation.
In the existing magnetic material beneficiation technology at home and abroad, the main flow process is wet grinding, and the process technology and equipment composition are mature through the development of the beneficiation technology for nearly two hundred years. However, as iron ore resources become more and more intense and environmental protection pressure of iron and steel enterprises becomes more and more increased, disadvantages and shortcomings thereof have come to be highlighted, such as: the wet grinding process has the advantages of overlong route, high production cost and high investment cost for factory construction; the tailings are easy to produce secondary pollution, the occupied area of a tailings pond is large, and the tailings pond is difficult to reclamation after the tailings pond is closed; the conditions and the productivity of factory construction are restricted in arid and cold areas, etc.
At present, the iron ore dry-type weak magnetic separation technology commonly used at home and abroad mainly comprises two types of particle ore dry-type weak magnetic separation and powder ore dry-type weak magnetic separation. (1) dry type weak magnetic separation of the ore particles: because the upper limit of ore granularity can reach 150mm, the lower limit granularity is generally 3mm, and the dissociation granularity of iron minerals is less than 0.15mm (150 μm), the dry magnetic separation process is mostly applied to preselection waste disposal (waste stone and surrounding rock), reduction of grinding amount and improvement of the selection grade, so as to achieve the purposes of energy saving, consumption reduction and synergy. The purchasing standard required by the iron concentrate in the current iron material market is about 60% of iron grade, while the iron concentrate grade obtained by the iron ore dry concentration process under the current technical level is generally about 50%, and few production examples reaching qualified iron concentrate are produced. (2) dry type weak magnetic separation of the powder ore: grinding the iron ore to a granularity of less than 0.15mm (150 mu m), and carrying out dry separation by adopting a dry magnetic separation process. In the dry magnetic separation process of iron ore, a horizontal dry magnetic separator is used as a plurality of devices, and the working principle is as follows: the powder magnetic material is paved on a belt of the dry magnetic separator, the belt carrying the material is adsorbed on the upper surface of the belt due to the action of the magnetic induction intensity of the magnetic system in the movement process of the upper surface of the magnetic system, and the non-magnetic material is blown out from the inside of the material due to the fact that the non-magnetic material is not influenced by the magnetic force of the magnetic system due to the fact that the non-magnetic material is blown out of the material under the action of blowing air, and the separation space is brought out along with air flow, so that the separation of the magnetic material and the non-magnetic material is realized. The main problems of this sorting method are: (1) in a horizontal dry magnetic separator, 1 group of magnetic systems, 1 set of machine grids, 1 group of blast systems and 1 exhaust hood are generally arranged in 1 dry magnetic separator, the magnetic field intensity, blast volume and exhaust volume at each position in a separation area are equal, and the sizes of the magnetic systems, the blast volume and the exhaust hood cannot be adjusted; (2) when the magnetic field intensity of the magnetic system is uniform before and after the magnetic field intensity, the magnetic materials are in the initial stage of separation, the separation area needs higher magnetic field intensity due to lower iron grade of iron ore, the magnetic induction field intensity of the magnetic system cannot be improved, and the blown air can cause the loss of iron oxide; in the later stage of magnetic material separation, as the iron grade of iron ore is higher, the separation area needs lower magnetic field intensity, the magnetic induction field intensity of a magnetic system cannot be reduced, and the higher magnetic induction intensity of the separation area can cause that a large amount of non-magnetic materials are wrapped in the separation material, so that high-grade iron concentrate cannot be produced; (3) when the blast capacity and the exhaust capacity of the horizontal dry magnetic separator cannot be adjusted, the magnetic materials are caused to have lower iron grade and lower magnetic induction intensity in the initial stage of separation, part of iron-containing materials with weaker magnetism are blown up by blast air and then are brought into tailings along with the exhaust air flow, and in the later stage of separation of the magnetic materials, the magnetic induction intensity of the materials is also improved after the iron grade of the materials is improved, and non-magnetic materials mixed in the magnetic materials are difficult to be blown out by the air flow, so that the separation efficiency is reduced; (4) in the horizontal dry magnetic separator, in order to uniformly distribute blast capacity and exhaust capacity in the whole separation area, the separation area is generally set to be approximately a square area, and the separation area of the horizontal dry magnetic separator is shorter due to the limitation of the distribution width of the separation area, so that the separation efficiency of magnetic materials is lower, and the produced iron concentrate iron grade is lower.
At present, though the iron ore dry magnetic separation process has the defects, the product after the iron ore magnetic separation does not need a dehydration link, the tailing disposal process is simpler and more convenient, the process accords with the environment-friendly policy advocated by the nation, and the disposal cost of the product after the magnetic separation is greatly reduced. And secondly, the process is free from water for mineral separation, is beneficial to continuous production in winter in severe cold areas and is also beneficial to reducing mineral separation cost in arid and water-deficient areas. Thus, the dry magnetic separation process still has an irreplaceable advantage over wet magnetic separation.
Disclosure of Invention
The invention aims to provide a sectional dry magnetic separation device for powdery magnetic materials, which aims to solve the problems of low grade of iron concentrate and low metal recovery rate in a dry magnetic separation process for the magnetic materials.
The invention further aims to provide a using method of the sectional dry magnetic separation device for the powdery magnetic materials.
The technical scheme of the invention is as follows: the utility model provides a powder magnetic material segmentation dry-type magnetic separation device, which comprises a frame, a belt, the magnetic system, feed mechanism, tailing collection device, the fan, the gas holder, blast pipe and air main, the belt is established in the frame, feed mechanism establishes in belt material loading end top, belt unloading end below is equipped with concentrate storehouse, the magnetic system is established in the material section below of belt, the blast pipe links to each other with air main, be equipped with governing valve on the air main, the gas holder links to each other with the fan air intake, the belt top is equipped with 3-5 separation areas side by side, every separation area all is equipped with blast mechanism and exhaust mechanism alone, exhaust mechanism's air outlet links to each other with tailing collection device, the fan passes through air main and blows for blast mechanism, the magnetic system comprises a plurality of main magnetic poles, a plurality of main magnetic poles are along belt width direction magnetic field intensity evenly distributed, follow belt length direction by material loading end to unloading end magnetic field intensity from high to low distribution.
As a further development of the invention, the magnetic fields of adjacent two main poles are opposite in direction.
As a further improvement of the invention, a repellent magnetic pole is arranged between two adjacent main magnetic poles, the magnetic fields of the two adjacent repellent magnetic poles are opposite in direction, and the main magnetic poles and the repellent magnetic poles are closely arranged along the length direction of the belt. The purpose of the magnetic repeller is to increase the depth of action of the main pole.
As a further improvement of the invention, the air suction mechanism comprises an air suction cover and an air suction tube, the air suction tube is connected with the air suction cover, the air suction cover covers the sorting area, and a sealing apron is arranged between the air suction cover and the magnetic mounting frame.
As a further improvement of the invention, the tailing collecting device comprises a cyclone collector, a cloth bag collector and a tailing bin, wherein the exhaust pipe, the cyclone collector and the cloth bag collector are sequentially connected in series, the tailing bin is arranged at the lower ends of the cyclone collector and the cloth bag collector, the upper end of the cloth bag collector is connected between a gas storage tank and a fan air inlet, and a back-blowing air compressor is connected on the gas storage tank. The bag dust removal is provided with pulses, and after the pulse time interval is set, the back blowing air compressor blows air into the bag, so that dust adsorbed on the bag is blown down, and the function of the bag dust removal is maintained.
As a further improvement of the invention, the blowing mechanism comprises air branched pipes and blowing pipes, each air branched pipe is connected with a plurality of blowing pipes, the blowing pipes are parallel to the width direction of the belt, the blowing pipes correspond to the low field intensity area between the main magnetic poles, a plurality of blowing openings are uniformly distributed at the bottom of the blowing pipes, and each blowing pipe is provided with a blowing valve.
As a further improvement of the invention, the blowing pipes are arranged with 1 at every two magnetic poles, a high field intensity area between two adjacent blowing pipes is provided with a pressing guide plate and a grid for recovering magnetic materials, and a magnetism collecting hanging piece is hung in the holes of the grid.
As a further improvement of the invention, the feeding mechanism comprises a bin, a belt scale and a vibration distributing device, wherein the bin, the belt scale and the vibration distributing device are sequentially arranged from top to bottom, and the lower end of the bin is provided with a star-shaped quantitative feeder; the feeding end of the belt is provided with a driving belt pulley, the discharging end of the belt is provided with a discharging belt pulley, a belt material brush close to the discharging belt pulley is arranged below the discharging belt pulley, and an inclined discharging guide plate is arranged below the belt material brush.
The application method of the sectional dry magnetic separation device for the powdery magnetic materials comprises the following steps:
A. the blast volume of each blast pipe is regulated through a blast valve, so that the blast volume of each sorting area is sequentially increased along the movement direction of the belt;
B. the magnetic field intensity of the magnetic system is regulated, so that the magnetic induction intensity of each main magnetic pole is sequentially reduced along the movement direction of the belt;
C. and (3) running the belt, uniformly paving the powdery magnetic materials on the belt by the feeding mechanism, and starting magnetic separation operation.
As a further improvement of the invention, in the step C, the running speed of the belt is 1-3m/s, and the distribution thickness of the magnetic material on the belt is 3-5mm.
The beneficial effects of the invention are as follows:
1. the device is provided with 3-5 separation areas, each separation area is independently provided with a blast mechanism and an exhaust mechanism, the blast capacity and the exhaust capacity of each separation area can be independently regulated and controlled, the magnetic field intensity of a plurality of magnetic poles in a magnetic system from a feeding end to a discharging end along the length direction of a belt is distributed from high to low, and in the dry separation process of magnetic materials, the magnetic separation efficiency, separation precision and metal recovery rate of the magnetic materials can be improved by regulating the parameters such as the magnetic field intensity, the blast capacity, the material thickness, the belt running speed and the like in each separation area according to different material thickness, different material iron grades and different belt speeds;
2. in the device, the magnetic fields of two adjacent main magnetic poles are opposite in direction, the magnetic particles are agglomerated into magnetic blocks with certain granularity under the action of the magnetic induction intensity of a magnetic system, the magnetic blocks are magnetically turned over when passing through the low field intensity areas of the two adjacent main magnetic poles (namely the middle positions of the two adjacent main magnetic poles) in the horizontal movement process along with a belt, the non-magnetic materials agglomerated in the materials are contacted with high-speed air flow when the magnetic blocks are magnetically turned over, the non-magnetic materials can be blown out from the materials, and the non-magnetic materials carried in the air flow can be recovered by the magnetic system at the lower part because the field intensity of the lower part of the guide plate is higher in the process of flowing through the lower part of the guide plate along the length direction of the belt;
3. the field intensity and the action depth of the separation space in the dry separation process of the horizontal dry magnetic separator have great influence on separation indexes, and the field intensity of the magnetic system determines the field intensity distribution of the separation space of the magnetic materials;
4. the device is provided with the grids, and the magnetism-gathering hanging pieces are hung in the holes of the grids, so that when gas-solid two-phase flow flows through a high field intensity area at the lower part of the guide plate and a gap between the grids and the magnetism-gathering hanging pieces, part of magnetic materials are adsorbed by the magnetic system, the grids and the magnetism-gathering hanging pieces, and the metal recovery rate in the dry separation process is improved;
5. the device of the invention connects the upper end of the cloth bag collector with the air inlet of the blower, and clean air discharged from the top of the tailing cloth bag collector enters the blower for pressurization, so that the air pressure can be increased to 9-10KPa; in the dry separation process of the magnetic materials, the energy carried by the air flow blown out by the air blowing port is in direct proportion to the quadratic power of the speed of the air flow, the speed attenuation degree of the air flow is in positive correlation with the distance from the air blowing port after the air flow leaves the air blowing port, and the separation efficiency in the dry separation process is improved by increasing the air blowing pressure from original 2-3KPa to 9-10KPa and simultaneously reducing the distance from the air blowing port to the surface of a belt as much as possible, so that the air blowing speed and the air blowing quantity are increased and more tailings are blown out from the interior of a material layer;
6. according to the method, the magnetic field intensity of the magnetic system is controlled to be sequentially reduced along the belt running direction, the blast capacity is sequentially increased along the belt moving direction, and the air extraction quantity is controlled, so that the ore dressing operation is finer, and the grade of iron ore concentrate and the metal recovery rate are improved;
7. according to the invention, the monomer magnetic particles are magnetized in the magnetic field and have certain adhesion force with each other besides the magnetic force induced by the magnetic source, the force is related to the magnetic induction intensity of the separation space, the quantity and the mass concentration of the monomer magnetic particles in the unit volume of the separation space, the adhesion force between the monomer magnetic particles is strong when the concentration is high, and the magnetic agglomeration trend is strong, namely: a large number of fine magnetic particles may agglomerate into a small number of coarser magnetic agglomerated particles that are more sensitive to magnetic field forces; compared with the monomer particles, the magnetic agglomerated particles have large mass specific surface area, reduce the sensitivity to wind force and are beneficial to improving the metal recovery rate, so that the size of the solid-gas ratio has great influence on the sorting index; when the solid-gas ratio in the dry separation process of the magnetic materials is too low, the tendency of the monomer magnetic particles to form magnetic agglomerated particles is weak, so that the magnetic loss of the materials is large; when the solid-gas ratio is too high, although the magnetic agglomeration of the single magnetic particles is enhanced, the load of the unit sorting medium for moving the non-magnetic particles out of the sorting area is increased due to the excessive solid materials in the sorting space, so that the momentum and energy obtained by the non-magnetic particles from the sorting medium are insufficient, and the sorting efficiency is greatly reduced; the invention improves the belt running speed from 0.2-0.4m/s to 1-3m/s and the distribution thickness of the magnetic material on the belt to 3-5mm, thus greatly improving the solid-gas ratio in the dry separation process of the magnetic material, and further improving the metal recovery rate and the equipment productivity of the dry separation of the magnetic material.
Drawings
FIG. 1 is a schematic diagram of a sectional dry magnetic separator for powdery magnetic materials;
FIG. 2 is a diagram of the positional relationship between a blowpipe, a depressed guide plate and a grill in the present invention;
fig. 3 is an enlarged view of a portion a in fig. 2;
FIG. 4 is a schematic view of the structure of the grille of the present invention;
FIG. 5 is a schematic view of the blower mechanism of the present invention;
FIG. 6 is a schematic diagram of the front view of the magnetic system of the present invention;
FIG. 7 is a schematic top view of the magnetic system of the present invention.
In the figure, 1-belt; 2-a blower mechanism; 3-magnetic system; 4-a frame; 5-a concentrate bin; 6-sorting area; 7-a fan; 8-an air storage tank; 9-exhaust pipe; 10-an air main; 11-main pole; 12-magnetic pole repulsion; 13-air separation pipes; 14-a blowpipe; 15-a blowing valve; 16-an exhaust hood; 17-exhaust tube; 18-adjusting a valve; 19-a cyclone collector; 20-a cloth bag collector; 21-a tailing bin; 22-depressing the deflector; 23-grating; 24-magnetism gathering hanging pieces; 25-bin; 26-belt scale; 27-vibrating a distributor; 28-star doser; 29-a drive pulley; 30-a discharge pulley; 31-belt brush; 32-a discharge guide; 33-sealing apron.
Detailed Description
As shown in fig. 1-7, a powder magnetic material subsection dry magnetic separation device comprises a frame 4, a belt 1, a magnetic system 3, a feeding mechanism, a tailing collecting device, a fan 7, an air storage tank 8, an exhaust pipe 9 and an air header 10, wherein the belt 1 is arranged on the frame 4, the feeding mechanism is arranged above the feeding end of the belt 1, a concentrate bin 5 is arranged below the discharging end of the belt 1, the magnetic system 3 is arranged below a material bearing section of the belt 1, the exhaust pipe 9 is connected with the air header 10, an adjusting valve 18 is arranged on the air header 10, the air storage tank 8 is connected with an air inlet of the fan 7, 3-5 separation areas 6 are arranged above the belt 1 side by side, each separation area 6 is provided with an air blowing mechanism 2 and an air draft mechanism, an air outlet of the air draft mechanism is connected with the tailing collecting device, the fan 7 is blown by the air blowing mechanism 2 through the air header 10, the magnetic system 3 is composed of a plurality of main magnetic poles 11, and the magnetic poles 11 are uniformly distributed along the width direction of the belt 1, and the magnetic field intensity is distributed from the feeding end to the discharging end along the length direction of the belt 1 from high to low.
The magnetic fields of adjacent two main poles 11 are opposite in direction.
A magnetic repellent pole 12 is arranged between two adjacent main magnetic poles 11, the magnetic field directions of the two adjacent magnetic repellent poles 12 are opposite, and the main magnetic poles 11 and the magnetic repellent poles 12 are closely arranged along the length direction of the belt 1.
The suction mechanism comprises a suction hood 16 and a suction tube 17, the suction tube 17 is connected with the suction hood 16, the suction hood 16 is covered above the sorting area 6, and a sealing apron 33 is arranged between the suction hood 16 and the mounting frame of the magnetic system 3.
The tailing collecting device comprises a cyclone collector 19, a cloth bag collector 20 and a tailing bin 21, wherein the exhaust pipe 17, the cyclone collector 19 and the cloth bag collector 20 are sequentially connected in series, the tailing bin 21 is arranged at the lower ends of the cyclone collector 19 and the cloth bag collector 20, the upper end of the cloth bag collector 20 is connected between the air storage tank 8 and the air inlet of the fan 7, and the air storage tank 8 is connected with a back-blowing air compressor.
The blowing mechanism 2 comprises air branch pipes 13 and blowing pipes 14, each air branch pipe 13 is connected with a plurality of blowing pipes 14, the blowing pipes 14 are parallel to the width direction of the belt 1, the blowing pipes 14 correspond to low field intensity areas between the main magnetic poles 11, a plurality of blowing ports are uniformly distributed at the bottom of the blowing pipes 14, and each blowing pipe 14 is provided with a blowing valve 15.
The blowing pipes 14 are arranged 1 at each interval of two magnetic poles 11, a pressing guide plate 22 and a grid 23 are arranged in a high field intensity area between two adjacent blowing pipes 14, and a magnetism collecting hanging piece 24 is hung in a hole grid of the grid 23.
The feeding mechanism comprises a storage bin 25, a belt scale 26 and a vibration distributing device 27, wherein the storage bin 25, the belt scale 26 and the vibration distributing device 27 are sequentially arranged from top to bottom, and a star-shaped quantitative feeder 28 is arranged at the lower end of the storage bin 25; the feeding end of the belt 1 is provided with a driving belt pulley 29, the discharging end of the belt 1 is provided with a discharging belt pulley 30, a belt material brush 31 close to the discharging belt pulley 30 is arranged below the discharging belt pulley 30, and an inclined discharging guide plate 32 is arranged below the belt material brush 31.
Example 1,
Taking the setting of 3 sorting areas 6 as an example, as shown in fig. 1, the sorting areas are sequentially a first sorting area, a second sorting area and a third sorting area from right to left (from the feeding end to the discharging end).
The blowing openings of the blowing pipe 14 are arranged in the width direction of the belt 1, parallel to the surface of the belt 1 and at a low field strength area of 7-12mm from the surface of the belt 1. 14-20 blowpipes 14 are provided per blower mechanism.
The grid 23 adopts a carbon steel screen mesh with the aperture of 1-2mm, and the grid 23 is fixed on the frame 4; the magnetism gathering hanging pieces 24 made of carbon steel are hung in the holes of the grid 23, and the magnetism gathering hanging pieces 24 are movably connected with the grid 23, and the length of the magnetism gathering hanging pieces is 15-25mm.
In the magnetic system 3, neodymium iron boron and strontium ferrite are adopted as magnetic block materials.
The regulating valve 18 is used for regulating the air circulation amount, and a small amount of redundant air is discharged through the exhaust pipe 9.
The magnetic field intensity of the opposite areas of the main magnetic poles 11 is strong, the magnetic field intensity of the middle position of the adjacent main magnetic poles 11 is the weakest, and the magnetic field intensity formed by the whole magnetic system 3 along the movement direction of the belt 1 is similar to a sine curve which is weakened in sequence.
The using method of the sectional dry magnetic separation device for the powdery magnetic materials comprises the following steps:
A. the blast volume of each blast pipe 14 is regulated by a blast valve 15, so that the blast volume of each sorting area 6 is sequentially increased along the movement direction of the belt 1;
B. setting the magnetic induction intensity of the magnetic system 3 corresponding to the first selected area to be 7500-8000 Oe, the magnetic induction intensity of the magnetic system 3 corresponding to the second selected area to be 5000-5500 Oe, and the magnetic induction intensity of the magnetic system 3 corresponding to the third selected area to be 3500-4000 Oe;
C. after being added from a storage bin, powdery magnetic materials with the granularity of 0-1 mm and the iron grade of 30-35% are uniformly paved on a horizontal belt 1 according to the thickness of 3-5mm through a star doser 28, a belt scale 26 and a vibration distributor 27; the running speed of the belt 1 is controlled to be 1-3m/s, and the magnetic separation operation is started.
After the powdery material enters a selection area, magnetic particles in the material are adsorbed by the first group of main magnetic poles 11 of the magnetic system 3 under the action of magnetic field force, and the adsorbed magnetic particles generate magnetic agglomeration phenomenon and are mixed with non-magnetic particles. When the powdery material moves horizontally along with the belt 1 to the 'zero field intensity' area of the magnetic field (namely the middle position of two adjacent main magnetic poles), air with the wind speed of 40-60 m/s is blown to the surface of the material through the blowing pipe 14, and part of non-magnetic particles mixed in the magnetic agglomerated material can be blown out of the material surface and taken away along with the air flow. Then the material moves along with the belt to enter the second group of main magnetic poles 11, and is carefully selected again; the magnetic materials in the magnetic materials can be enriched step by step through multiple times of wind-magnetic coupling selection. After the magnetic material is pre-selected by a selection area, the iron grade of the magnetic material is improved from 30-35% to 42-45%. The pre-selected magnetic material enters a second selection area for rough selection, and the iron grade of the magnetic material is improved from 42-45% to 51-53%. After the roughing material enters a three-selection area for selection, the iron grade of the roughing material is improved from 51-53% to 56-61%, and concentrate is produced. After the concentrate is conveyed out of the magnetic system 3 through the belt 1, the concentrate is brushed down from the belt by the belt brush 31 when passing through the belt brush 31, and enters the concentrate bin 5 for storage under the guiding action of the discharging guide plate 32.
The high-speed air flow blown out from the blowing pipe 14 is blown to the surface of the material with lower magnetic induction intensity perpendicular to the surface of the belt 1, and the magnetic materials entering the magnetic separation space are agglomerated into magnetic blocks with certain granularity under the action of the magnetic induction intensity of the magnetic system 3 due to the opposite magnetic field directions of the two adjacent main magnetic poles 11 along the length direction of the belt 1, and the magnetic blocks are magnetically turned over when passing through the low field intensity areas of the two adjacent main magnetic poles in the horizontal movement process along with the belt 1. When the magnetic block is magnetically turned over, the non-magnetic materials agglomerated in the materials are contacted with high-speed air flow, so that the non-magnetic materials can be blown out from the materials, and in the process that the non-magnetic materials carried in the air flow through the lower part of the pressing guide plate 22 along the length direction of the belt 1, as the field intensity of the lower part area of the pressing guide plate 22 is higher, part of the weak magnetic materials carried in the air flow are adsorbed by the magnetic system 3 at the lower part, so that the magnetic materials carried in the air flow can be recovered.
The air blown into the material layer overflows the material layer and carries a large amount of fine granular materials, most of the fluidized fine particles are mutually adsorbed with the air in the process of flowing through the grid 23 to form coarse-grain magnetic materials, the coarse-grain magnetic materials sink and are bound by the magnetic system 3 again, and the rest of the non-magnetic particle air draft mechanism is used for pumping away.
The gas-solid two-phase flow in the magnetic material sorting process flows through the gaps between the magnetism collecting hanging pieces 24 and the holes of the screen; because the carbon steel screen mesh and the magnetism-gathering hanging piece 24 adopt magnetic conduction materials, magnetization can be generated under the action of the magnetic induction intensity of the magnetic system 3, when materials carried in the air flow through the grid 23, the magnetic materials in the air-solid two-phase flow are adsorbed by the screen mesh and the magnetism-gathering hanging piece 24 under the action of magnetic field force, and the non-magnetic materials in the air-solid two-phase flow are directly carried out of the dry separation area by the air flow, so that the metal recovery rate in the dry separation process is improved.
The positive pressure gas-solid two-phase flow discharged from the grating 23 enters a negative pressure area, the tailing powder is collected through the cyclone collector 19 and the cloth bag collector 20, and most of air is recycled except a small part of air is discharged after the discharged clean air is pressurized by the fan 7.
The tailing gas-solid two-phase flow from the exhaust hood 16 is conveyed into the cyclone collector 19, 80-90% of the tailings in the gas-solid two-phase flow are separated under the action of gravity and centrifugal force, part of the tailings which are not separated are carried by air continuously and enter the cloth bag collector 20, the tailings are separated under the action of cloth bag filtration, and the tailings collected from the bottoms of the cyclone collector 19 and the cloth bag collector 20 enter the tailings bin 21.
The running speed of the belt 1 is controlled to be 1-3m/s, the distribution thickness of the magnetic material on the belt is 3-5mm, and the pressure of the injected air is 9-10KPa, so that the solid-gas ratio in the dry separation process of the magnetic material can be improved, and the metal recovery rate and the equipment productivity of the magnetic material are improved.
The invention solves the problems of low grade of iron concentrate, low metal recovery rate, low beneficiation efficiency and low single machine productivity in the magnetic material dry magnetic separation process.

Claims (7)

1. The utility model provides a powdered magnetic material segmentation dry-type magnetic separation device, includes frame, belt, magnetic system, feed mechanism, tailing collection device, fan, gas holder, blast pipe and air main, the belt is established in the frame, feed mechanism establishes in belt material loading end top, and belt unloading end below is equipped with concentrate storehouse, the magnetic system is established in the material section below of bearing of belt, the blast pipe links to each other with air main, is equipped with governing valve on the air main, the gas holder links to each other with the fan air intake, its characterized in that: 3-5 sorting areas (6) are arranged above the belt (1) side by side, each sorting area (6) is provided with a blowing mechanism (2) and an air draft mechanism, an air outlet of the air draft mechanism is connected with a tailing collecting device, a fan (7) blows air for the blowing mechanism (2) through an air main pipe (10), the magnetic system (3) consists of a plurality of main magnetic poles (11), the magnetic field intensity of the main magnetic poles (11) is uniformly distributed along the width direction of the belt (1), and the magnetic field intensity of the magnetic field is distributed from the feeding end to the discharging end along the length direction of the belt (1) from high to low;
the air suction mechanism comprises an air suction cover (16) and an air suction pipe (17), the air suction pipe (17) is connected with the air suction cover (16), the air suction cover (16) covers the sorting area (6), and a sealing apron (33) is arranged between the air suction cover (16) and the mounting frame of the magnetic system (3);
the blowing mechanism (2) comprises air branched pipes (13) and blowing pipes (14), each air branched pipe (13) is connected with a plurality of blowing pipes (14), the blowing pipes (14) are parallel to the width direction of the belt (1), the blowing pipes (14) correspond to low field intensity areas between the main magnetic poles (11), a plurality of blowing openings are uniformly distributed at the bottoms of the blowing pipes (14), and each blowing pipe (14) is provided with a blowing valve (15);
the blowing pipes (14) are arranged 1 at each interval of two main magnetic poles (11), a high field intensity area between two adjacent blowing pipes (14) is provided with a pressing guide plate (22) and a grid (23), and a magnetism collecting hanging piece (24) is hung in a hole grid of the grid (23).
2. The segmented dry magnetic separation device for powdery magnetic materials according to claim 1, wherein: the magnetic fields of two adjacent main magnetic poles (11) are opposite in direction.
3. The powder magnetic material sectional dry magnetic separation device according to claim 2, wherein: a magnetic repellent pole (12) is arranged between two adjacent main magnetic poles (11), the magnetic field directions of the two adjacent magnetic repellent poles (12) are opposite, and the main magnetic poles (11) and the magnetic repellent poles (12) are closely arranged along the length direction of the belt (1).
4. A segmented dry magnetic separation device for powdery magnetic materials according to any one of claims 1 to 3, characterized in that: the tailing collecting device comprises a cyclone collector (19), a cloth bag collector (20) and a tailing bin (21), wherein the exhaust pipe (17), the cyclone collector (19) and the cloth bag collector (20) are sequentially connected in series, the tailing bin (21) is arranged at the lower ends of the cyclone collector (19) and the cloth bag collector (20), the upper end of the cloth bag collector (20) is connected between an air storage tank (8) and an air inlet of a fan (7), and a back-blowing air compressor is connected to the air storage tank (8).
5. The sectional dry magnetic separation device for powder magnetic materials according to claim 4, wherein: the feeding mechanism comprises a bin (25), a belt scale (26) and a vibration distributing device (27), wherein the bin (25), the belt scale (26) and the vibration distributing device (27) are sequentially arranged from top to bottom, and a star-shaped quantitative feeder (28) is arranged at the lower end of the bin (25); the feeding end of the belt (1) is provided with a driving belt pulley (29), the discharging end of the belt (1) is provided with a discharging belt pulley (30), a belt material brush (31) close to the discharging belt pulley (30) is arranged below the discharging belt pulley (30), and an inclined discharging guide plate (32) is arranged below the belt material brush (31).
6. A method of using the segmented dry magnetic separation device for powder magnetic materials of claim 1, comprising the steps of:
A. the blast volume of each blast pipe (14) is regulated through a blast valve (15) so that the blast volume of each sorting area (6) is sequentially increased along the movement direction of the belt (1);
B. the magnetic field intensity of the magnetic system (3) is regulated, so that the magnetic induction intensity of each main magnetic pole (11) is sequentially reduced along the movement direction of the belt (1);
C. and (3) running the belt (1), uniformly paving the powdery magnetic materials on the belt (1) by the feeding mechanism, and starting magnetic separation operation.
7. The method for using the sectional dry magnetic separation device for powder magnetic materials according to claim 6, wherein the method comprises the following steps: in the step C, the running speed of the belt (1) is 1-3m/s, and the distribution thickness of the magnetic material on the belt (1) is 3-5mm.
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