CN108057518B - Horizontal wind-magnetic synchronous joint selection device and method for magnetic materials - Google Patents
Horizontal wind-magnetic synchronous joint selection device and method for magnetic materials Download PDFInfo
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- CN108057518B CN108057518B CN201711218770.3A CN201711218770A CN108057518B CN 108057518 B CN108057518 B CN 108057518B CN 201711218770 A CN201711218770 A CN 201711218770A CN 108057518 B CN108057518 B CN 108057518B
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- 239000000696 magnetic material Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 96
- 238000007664 blowing Methods 0.000 claims abstract description 42
- 239000012141 concentrate Substances 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 21
- 239000004744 fabric Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000007790 scraping Methods 0.000 claims abstract description 9
- 239000006249 magnetic particle Substances 0.000 claims description 33
- 238000005054 agglomeration Methods 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 14
- 230000002776 aggregation Effects 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000005514 two-phase flow Effects 0.000 claims description 6
- 239000010419 fine particle Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 238000010187 selection method Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 3
- 230000002950 deficient Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract 1
- 239000002912 waste gas Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 238000007885 magnetic separation Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 9
- 238000011084 recovery Methods 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
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- 238000005243 fluidization Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052952 pyrrhotite Inorganic materials 0.000 description 1
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- 238000009628 steelmaking Methods 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses a horizontal wind-magnetic synchronous joint separation device and method for magnetic materials, wherein the device mainly comprises a frame, a driving belt pulley, a discharging belt pulley, a belt, a scraping plate, a concentrate bin, a magnetic system, a powdery material feeding hopper, a collecting cover, a cloth bag collector, a tailing bin, a gas storage tank, an exhaust fan, a back-blowing air compressor, a waste gas discharge pipeline, a blowing pipe and a blower; the method has the advantages of short process flow, small equipment quantity, low investment cost for factory construction, irreplaceable advantages in severe cold areas and arid water-deficient areas, and extremely high popularization value.
Description
Technical Field
The invention belongs to the technical field of mineral separation engineering, in particular to a horizontal wind-magnetic synchronous joint selection device and method for magnetic materials.
Background
Magnetic separation is a common mineral separation method with wide application. For the specific magnetization coefficient χ > 3 x 10 -3 cm 3 The magnetic substance/g can be recovered by a weak magnetic separation device (i.e., weak magnetic separation process) having a magnetic field strength of 120-279KA/m (1500-3500. Smallcircle.). Common resources containing stronger magnetic substances are natural magnetite, maghemite (gamma-Fe) 2 O 3 ) Titano-magnetite, pyrrhotite, zincite [ (Zn, mn) Fe 2 O 4 ]Roasting magnetite (including iron-containing fly ash of a power plant), smelting slag of a steelmaking converter and other iron materials.
Weak magnetic separation for magnetic material the process is divided into wet methods weak magnetic separation and dry weak magnetic separation. Wet low-intensity magnetic separation is the main stream technology for treating stronger magnetic materials at present. The technological process generally comprises the links of crushing and screening, grinding and grading, multi-stage magnetic separation, concentrate concentration, filtration and dehydration, tailing concentration and transportation, natural sedimentation and stockpiling of tailings in a dam (reservoir), recycling of tailings and the like. Although the wet low-intensity magnetic separation process can obtain iron material resources with higher quality, the wet low-intensity magnetic separation process has a plurality of defects compared with the dry process when analyzed from the included process procedures: (1) The wet process has long route, and the subsequent products contain concentrating, filtering and dewatering links, thus increasing the ore dressing cost and the investment cost for factory construction. This disadvantage is particularly pronounced in arid areas where water is scarce. (2) Secondary pollution can be generated in the wet process, and the underground water quality is affected; the tailings are piled up in the warehouse, water leakage and dam break are required in daily operation, and besides the cost is increased, the hidden danger of safety and environmental protection exists; the tailings pond occupies a large area, and the reclamation is difficult to realize after the pond is closed. (3) The wet magnetic concentrate has higher water content, and in severe cold areas, concentrate storage and transportation are difficult in winter, so that part of sorting factories are forced to stop production, and economic benefit is influenced.
The currently commonly used dry low-intensity magnetic separation process has the advantages that the upper limit of the granularity can reach 150mm, the lower limit is generally 3mm (namely the discharge granularity of a high-pressure roller mill), and the dissociation granularity of iron minerals is less than 0.15mm (150 mu m), so that the dry separation process is mostly applied to preselection waste (waste stone and surrounding rock), the grinding entering amount is reduced, the selecting grade is improved, and the purposes of energy conservation, consumption reduction and synergy are achieved. The purchasing standard required by the iron material market is about 60% grade, and the concentrate grade of the dry concentration process in the current state of the art is generally about 50%, so that the production example of qualified concentrate is almost achieved.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a horizontal wind-magnetic synchronous combined device for magnetic materials, which has the advantages of high concentrate grade and metal recovery rate, low cost, environmental protection and no pollution.
The invention further aims to provide a horizontal wind-magnetic synchronous joint selection method for magnetic materials.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a synchronous allies oneself with of magnetic material horizontal wind magnetism selects device, includes the frame and sets up driving pulley and the belt pulley of unloading in the frame, one side of belt pulley of unloading is equipped with scrapes the flitch and scrapes the below of flitch and is equipped with concentrate storehouse, driving pulley and belt pulley of unloading pass through the belt and connect, the below of belt material section is equipped with the magnetic system that contains multiunit magnet, the top of belt material section is equipped with powder material feed hopper and collects the one end setting that cover and powder material feed hopper are close to driving pulley, the top of collecting the cover is connected with sack collector and sack collector discharge gate below is equipped with the tailing storehouse, the sack collector is connected with gas holder and air exhauster, the gas holder is connected with the blowback air compressor machine, the air exhauster is connected with exhaust emission pipeline, the below of collecting the cover is equipped with a plurality of blowpipes and the equipartitions on the blowpipe, the one end of blowpipe is connected with the air-blower.
Further, the magnetic system is arranged on the magnetic system reciprocating trolley, the magnetic system reciprocating trolley is arranged on the rack, the magnetic system reciprocating trolley is connected with a reciprocating motion mechanism, the magnetic system reciprocating trolley is connected with the blowing pipe through the synchronous connecting rod, and the blowing pipe is connected with the blower through the connecting hose.
Further, the magnetic system comprises a non-magnetic conduction bottom plate, a magnetic system fixed magnetic conduction steel plate is arranged on the non-magnetic conduction bottom plate, a plurality of groups of magnets are arranged on the magnetic system fixed magnetic conduction steel plate, a non-magnetic conduction stainless steel cover is arranged outside the plurality of groups of magnets, and a plurality of non-magnetic conduction stainless steel bars are arranged at the top of the non-magnetic conduction stainless steel cover.
Further, the magnetic poles of the plurality of groups of magnets in the magnetic system are arranged in a staggered manner or in the same direction.
Further, a vibration distributor is arranged on the powdery material feeding hopper.
Further, the reciprocating mechanism is a crank-link mechanism fixed on the frame.
Further, the bottom of collecting cover is equipped with the rubber apron, be equipped with the guide plate on the collecting cover inner wall.
Further, a grid with the thickness of 20mm and the aperture of 1-2mm is arranged between the blowing pipes, the grid is formed by overlapping multiple layers of non-magnetic metal nets in a staggered mode, the distance between every two adjacent layers of non-magnetic metal nets is 1-2mm, and the distance between the lower surface of the grid and the upper surface of the belt material bearing section is 8-11mm.
Further, two belt carrier rollers are arranged at the bottom of the belt material bearing section, two belt conveying supporting wheels are arranged at the top of the belt circulating section, and the belt conveying supporting wheels are fixed on the frame.
A horizontal wind-magnetic synchronous joint selection method for magnetic materials comprises the following steps:
A. after powdery material with the granularity of 0-1mm is added from a powdery material feeding hopper, the powdery material is evenly spread on a horizontal belt according to the thickness of 3-5mm under the action of a distributing device;
B. after the powdery material moves along with the belt and enters a magnetic field area of the magnetic system, magnetic particles in the powdery material are adsorbed by a first group of magnets in the magnetic system under the action of magnetic field force, and the adsorbed magnetic particles generate magnetic agglomeration phenomenon and are mixed with non-magnetic particles;
C. when the powdery material moves horizontally along with the belt to the 'zero field intensity' area of the magnetic field, air with the air speed of 30-40m/s is blown to the surface of the material through a blowing opening on a blowing pipe, part of non-magnetic particles mixed in the magnetic agglomerated material are blown out of the material surface and taken away along with the air flow and then collected through a collecting cover;
D. then the material continuously moves along with the belt to enter the magnetic field area of the second group of magnets, and the materials are carefully selected again; the magnetic materials in the magnetic materials can be enriched step by step through multiple times of wind-magnetic coupling selection, and concentrate is produced;
E. after the concentrate is transported out of the magnetic field area of the magnetic system through the belt, the concentrate is scraped from the belt by the scraping plate when passing through the discharging belt pulley, and enters a concentrate bin for storage;
F. the air which is blown into the material layer through the blowing opening on the blowing pipe overflows the material layer and carries a large amount of fine granular materials, and most of the fluidized fine particles are mutually adsorbed to form coarse-grained magnetic materials along with the air in the process of flowing through the grid, sink and are bound by the magnetic system again;
G. the positive pressure gas-solid two-phase flow discharged from the grating enters a negative pressure area, flows through a cloth bag collector, collects tailing powder, and discharges clean air after being pressurized by an exhaust fan.
The technical principle of the invention is as follows: (1) After the magnetic particle materials are magnetized in the magnetic field, magnetization intensity positively related to the field intensity of the magnetic source can be generated, that is, the magnetic force suffered by the magnetic particles has strong tendency of magnetic agglomeration and magnetic wrapping due to the magnetic adsorption force among the particles besides the magnetic field force of the magnetic source. Meanwhile, the magnetic substance has hysteresis characteristic, and has certain residual magnetism when the magnetic substance is in a zero field intensity area, but the residual magnetism intensity is lower (15-30O e), and the magnetic agglomeration and the magnetic wrapping among the fine magnetic particles are easily broken up by external force. (2) After the magnetic material enters the magnetic field space, the magnetic particles can receive the magnetic field force of the magnetic source, and the size of the magnetic particles is related to the field intensity, gradient, magnetic conductivity (specific magnetization coefficient) of the magnetic source and the like; the magnetic field strength is high, the gradient is large, and the magnetic field force is strong when the magnetic field strength is higher than the magnetization coefficient. Because the magnetic particles are magnetized in the magnetic field, magnetic adsorption force is necessarily existed among the particles to be mutually adsorbed to form magnetic agglomeration, and the magnetic adsorption force is related to the diameter of the magnetic particles, the residual magnetism of the magnetic particles and the like besides the factors; the smaller the particle diameter, the higher the "remanence", and the relatively greater the magnetic attraction between the particles. (3) Because the 'zero field intensity' area exists in the specific area of the open magnetic system, the blowing pipe is arranged in the 'zero field intensity' area, so that magnetic particles can break the 'magnetic agglomeration', 'magnetic wrapping' among the magnetic particles under the combined action of magnetic source magnetic field force, magnetic adsorption force among the particles, friction force on the particles, gravity of the particles and supplied wind force, and nonmagnetic particles are not influenced by the magnetic field force and the magnetic adsorption force among the particles, and the magnetic particles enter the wind system against the gravity under the continuous actions of 'positive pressure wind field' blowing off air turbulence and 'negative pressure wind field', thereby realizing the separation of magnetic materials and nonmagnetic materials. (4) The materials to be sorted repeatedly undergo the processes of agglomeration, breaking up agglomeration, removing nonmagnetic particles, re-agglomeration, re-breaking up and re-removing, so that the sorting precision and the sorting efficiency of the units can be greatly improved.
Compared with the prior art, the invention has the following beneficial effects: the horizontal wind-magnetic synchronous joint selection device for the magnetic materials mainly comprises a frame, a driving belt pulley, a discharging belt pulley, a belt, a scraping plate, a concentrate bin, a magnetic system, a powdery material feeding hopper, a collecting cover, a cloth bag collector, a tailing bin, an air storage tank, an exhaust fan, a back-blowing air compressor, an exhaust gas discharge pipeline, a blowing pipe and a blower, wherein the magnetic system is arranged to enable a specific area on the surface of the belt to have zero field intensity (the resultant force of magnetic forces of all sides of magnetic particles is zero). When magnetic particles in the material are magnetically agglomerated in a magnetic field and enter a zero field intensity area, the magnetic agglomeration in the material can be broken through by wind disturbance, and the inclusion of non-magnetic particles is reduced; in the magnetic field generated by a plurality of groups of magnets of a magnetic system, the materials to be sorted repeatedly undergo the processes of agglomeration, scattering and agglomeration, removing non-magnetic particles, re-agglomeration, re-scattering and re-removing for a plurality of times, so that the concentration and enrichment of the magnetic materials are finally realized, the grade of the finally obtained concentrate and the recovery rate of metal are high, the grade of the iron concentrate can reach 59-65%, and the recovery rate of metal can reach 85-95%; the dry discharge of tailings solves the problem that the tailings pond in the traditional wet process can produce secondary pollution, and eliminates hidden troubles in the aspects of safety and environmental protection; the method has the advantages of short process flow, small equipment quantity, low investment cost in factory construction, irreplaceable advantages in severe cold areas and arid water-deficient areas, good economical efficiency and extremely high popularization value.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a process flow diagram of the present invention;
FIG. 3 is a schematic diagram showing a plurality of sets of magnetic poles of magnets in a magnetic system according to the present invention;
FIG. 4 is a top view of the plurality of sets of magnets of FIG. 3;
FIG. 5 shows a plurality of groups of magnetic systems according to the present invention schematic diagram of the same-direction arrangement of magnetic poles of the magnet;
fig. 6 is a top view of the plurality of sets of magnets of fig. 5.
The reference numerals of the invention have the following meanings: 1. a frame; 2. a driving pulley; 3. a discharge pulley; 4. a scraping plate; 5. concentrate bin; 6. a belt; 7. a magnetic system; 8. a powder material hopper; 9. a collection cover; 10. a cloth bag collector; 11. a tailings bin; 12. a gas storage tank; 13. an exhaust fan; 14. a back-blowing air compressor; 15. an exhaust gas discharge pipe; 16. a blowing pipe; 17. blowing an air port; 18. a blower; 19. a magnetic reciprocating trolley; 20. reciprocating movement a mechanism; 21. a synchronous connecting rod; 22. a connecting hose; 23. a non-magnetic conductive base plate; 24. fixing a magnetic conduction steel plate by a magnetic system; 25. a non-magnetic stainless steel cover; 26. a non-magnetic stainless steel rod; 27. vibrating the distributing device; 28. rubber apron; 29. a deflector; 30. a grille; 31. a belt idler; 32. and the belt conveying supporting wheel.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in figure 1, the horizontal wind-magnetic synchronous joint selection device for magnetic materials comprises a frame 1, a driving belt pulley 2 and a discharging belt pulley 3 which are arranged on the frame 1, wherein one side of the discharging belt pulley 3 is provided with a scraping plate 4, a concentrate bin 5 is arranged below the scraping plate 4, the driving belt pulley 2 and the discharging belt pulley 3 are connected through a belt 6, the bottom of a belt 6 material bearing section is provided with two belt carrier rollers 31, the top of the belt 6 circulating section is provided with two belt conveying supporting wheels 32, the belt conveying supporting wheels 32 are fixed on the frame 1, a magnetic system 7 containing a plurality of groups of magnets is arranged below the belt 6 material bearing section, the magnetic system 7 has a surface magnetic field intensity of 7000-8000 Oe, the upper surface magnetic field intensity of the belt 6 material bearing section is 2800-3500 Oe, the magnetic system 7 comprises a non-magnetic conduction bottom plate 23, a magnetic system fixed magnetic conduction steel plate 24 is arranged on the non-magnetic conduction bottom plate 23, a plurality of groups of magnets are arranged on the magnetic system fixed magnetic conduction steel plate 24, a non-magnetic conduction stainless steel cover 25 is arranged outside the plurality of groups of magnets, a plurality of non-magnetic conduction stainless steel bars 26 are arranged on the top of the non-magnetic conduction stainless steel cover 25, the magnetic system 7 is arranged on the magnetic system reciprocating trolley 19, the magnetic system reciprocating trolley 19 is arranged on the frame 1, the magnetic system reciprocating trolley 19 is connected with a reciprocating mechanism 20, the reciprocating mechanism 20 is a crank connecting rod mechanism fixed on the frame 1, the magnetic system reciprocating trolley 19 swings reciprocally along the movement direction of the belt 6, the swing distance of the magnetic system reciprocating trolley 19 is 1-2 integer times of the distance between two adjacent magnets, and the swing period is 1-2s. A powder material hopper 8 and a collecting cover 9 are arranged above the material bearing section of the belt 6, the powder material hopper 8 is arranged near one end of the driving belt pulley 2, a vibration distributor 27 is arranged on the powder material hopper 8, a sealing rubber apron 28 is arranged around the bottom end of the collecting cover 9, the negative pressure of the gas-solid two-phase flow in the collecting cover 9 is controlled to be 0-10Pa, dust-containing gas in a positive pressure area can be prevented from overflowing, a guide plate 29 is arranged on the inner wall of the collecting cover 9, the top of the collecting cover 9 is connected with a cloth bag collector 10, a tailing bin 11 is arranged below a discharge hole of the cloth bag collector 10, the cloth bag collector 10 is connected with a gas storage tank 12 and an exhaust fan 13, the gas storage tank 12 is connected with a back-blowing air compressor 14, the exhaust fan 13 is connected with an exhaust gas discharge pipeline 15, a plurality of blowpipes 16 with the same width as the width of the belt 6 are uniformly distributed on the blowpipes 16, the blowing pipe 16 is connected with the blower 18 through the connecting hose 22, a grid 30 with the thickness of 20mm and the aperture of 1-2mm is arranged between the blowing pipes 16, the grid 30 is formed by overlapping a plurality of layers of non-magnetic metal nets in a staggered way, the distance between two adjacent layers of non-magnetic metal nets is 1-2mm, the lower surface of the grid 30 is 8-11mm away from the upper surface of a material bearing section of the belt 6, fine particles carried in fluidization in blowing air flow through the grid 30, due to staggered arrangement of the non-magnetic metal nets, the disturbance effect of gas-solid two-phase flow is increased, the residence time of solid particles in the grid is prolonged within the control range of the magnetic system 7, the trend that the fine magnetic particles adhere to each other is enhanced, coarse magnetic particles are formed, and the fine particles sink to the surface of the belt 6 under the action of magnetic field force and gravity. The blowing pipe 16 is connected with the magnetic reciprocating trolley 19 through the synchronous connecting rod 21, so that the blowing pipe 16 can synchronously swing along with the magnetic reciprocating trolley 19 in the process of reciprocating swing along the length direction of the belt 6, the position of the zero field intensity area and the position of the blowing port 17 are relatively fixed, the synchronization is maintained, the material sorting is realized with the minimum air quantity, and the sorting efficiency of the materials can be improved.
As shown in fig. 3-6, the magnetic system 7 has two ways of arranging a plurality of groups of magnetic poles, one is that a plurality of groups of magnetic poles are staggered: the magnetic poles are alternately arranged along the movement direction of the belt 6; the other is that a plurality of groups of magnet poles are arranged in the same direction: the poles are arranged in the same direction along the direction of movement of the belt 6.
Example 1
The powder material is magnetized roasting ore, iron grade is 39-41%, feO content is 16-17%, granularity is-300 meshes 90%, and water content is below 6%. As shown in fig. 2, the wind-magnetic synchronous joint selection is carried out on the powdery material, which comprises the following steps:
A. after the powdery material is added from the powdery material feeding hopper 8, the powdery material is evenly spread on the horizontal belt 6 according to the thickness of 5mm under the action of the distributing device 27, the running speed of the belt 6 is controlled to be 0.4-0.5m/s, the swinging period of the magnetic system 7 is 1s, the swinging amplitude is 100mm, and the magnetic field intensity of the upper surface of the material bearing section of the belt 6 is 2800 Oe.
B. After the powdery material moves along with the belt 6 and enters the magnetic field area of the magnetic system 7, the magnetic particles in the powdery material are adsorbed by the first group of magnets in the magnetic system 7 under the action of magnetic field force, the adsorbed magnetic particles produce magnetic agglomeration and are intercalated with non-magnetic particles.
C. When the powdery material moves horizontally along with the belt 6 to the 'zero field intensity' area of the magnetic field, air with the air speed of 30m/s is blown to the surface of the material through the air blowing opening 17 on the air blowing pipe 16, and part of non-magnetic particles mixed in the magnetic agglomerated material are blown out of the material surface and taken away along with the air flow and then collected through the collecting cover 9.
D. Then the material moves along with the belt 6 and enters the magnetic field area of the second group of magnets, and the materials are carefully selected again; the magnetic materials in the magnetic materials can be enriched step by step through multiple times of wind-magnetic combined separation, and concentrate is produced.
E. After the concentrate is transported out of the magnetic field area of the magnetic system by the belt 6, when passing through the discharge pulley 3, the scraped material plate 4 scrapes off the belt 6 and enters the concentrate bin 5 for storage.
F. The air blown into the material layer through the blowing openings 17 in the blowing pipe 16 overflows the material layer and carries a large amount of fine granular materials, and most of the fluidized fine grains are mutually adsorbed with air in the process of flowing through the grid 30 to form coarse magnetic materials, sink and are bound again by the magnetic system 7.
G. The positive pressure gas-solid two-phase flow discharged from the grating 30 enters a negative pressure area, flows through the cloth bag collector 10, collects tailing powder, and discharges clean air after being pressurized by the exhaust fan 13.
Results: the magnetized roasting ore is separated by a wind-magnetic synchronous combined separation process, the grade of iron concentrate reaches 59-61%, and the metal recovery rate reaches 85-86%.
Example 2
The powdery material is natural magnetite, the iron grade is 37-38%, the FeO content is 21-22%, the granularity range is-300 meshes, the powder material occupies more than 90%, and the water content is less than 6%. As shown in fig. 2, the wind-magnetic synchronous joint selection is carried out on the powdery material, which comprises the following steps:
A. after the powdery material is added from the powdery material feeding hopper 8, the powdery material is evenly spread on the horizontal belt 6 according to the thickness of 3mm under the action of the distributing device 27, the running speed of the belt 6 is controlled to be 0.3-0.4m/s, the swinging period of the magnetic system 7 is 2s, the swinging amplitude is 100mm, and the magnetic field intensity of the upper surface of the material carrying section of the belt 6 is 3500 Oe.
B. After the powdery material moves along with the belt 6 and enters the magnetic field area of the magnetic system 7, the magnetic particles in the powdery material are adsorbed by the first group of magnets in the magnetic system 7 under the action of magnetic field force, and the adsorbed magnetic particles generate magnetic agglomeration phenomenon and are mixed with non-magnetic particles.
C. When the powdery material moves horizontally along with the belt 6 to the 'zero field intensity' area of the magnetic field, air with the air speed of 40m/s is blown to the surface of the material through the air blowing opening 17 on the air blowing pipe 16, and part of non-magnetic particles mixed in the magnetic agglomerated material are blown out of the material surface and taken away along with the air flow and then collected through the collecting cover 9.
D. Then the material moves along with the belt 6 and enters the magnetic field area of the second group of magnets, and the materials are carefully selected again; the magnetic materials in the magnetic materials can be enriched step by step through multiple times of wind-magnetic combined separation, and concentrate is produced.
E. After the concentrate is transported out of the magnetic field region of the magnetic system through the belt 6, the concentrate is scraped from the belt 6 by the scraping plate 4 when passing through the unloading belt pulley 3, and enters the concentrate bin 5 for storage.
F. The air blown into the material layer through the blowing openings 17 in the blowing pipe 16 overflows the material layer and carries a large amount of fine granular materials, and most of the fluidized fine grains are mutually adsorbed with air in the process of flowing through the grid 30 to form coarse magnetic materials, sink and are bound again by the magnetic system 7.
G. The positive pressure gas-solid two-phase flow discharged from the grating 30 enters a negative pressure area, flows through the cloth bag collector 10, collects tailing powder, and discharges clean air after being pressurized by the exhaust fan 13.
Results: the magnetized roasting ore is separated by a wind-magnetic synchronous joint separation process, the grade of the iron concentrate reaches 62-63%, and the metal recovery rate reaches 88-90%.
Claims (5)
1. A horizontal wind-magnetic synchronous joint selection device for magnetic materials, the method is characterized in that: including frame (1) and set up driving pulley (2) and the belt pulley (3) of unloading on frame (1), one side of belt pulley (3) of unloading is equipped with scraping flitch (4) and scrapes the below of flitch (4) and is equipped with concentrate storehouse (5), driving pulley (2) and belt pulley (3) of unloading are connected through belt (6), the below of belt (6) material-bearing section is equipped with magnetic system (7) that contain multiunit magnet, magnetic system (7) include non-magnetic conduction bottom plate (23), be equipped with magnetic system fixed magnetic conduction steel sheet (24) on non-magnetic conduction bottom plate (23), the outside of installing multiunit magnet and multiunit magnet on magnetic system fixed magnetic conduction steel sheet (24) is equipped with non-magnetic conduction stainless steel cover (25), the top of non-magnetic conduction stainless steel cover (25) is equipped with a plurality of non-magnetic conduction stainless steel bars (26), multiunit magnet magnetic pole in magnetic system (7) stagger setting or syntropy setting, the top of belt (6) material-bearing section is equipped with powdery material hopper (8) and collection cover (9) and collection cloth bag (8) and be close to the top of cloth bag (10) is equipped with powder material collector (10) top portion (10), the cloth bag collector (10) is connected with an air storage tank (12) and an exhaust fan (13), the air storage tank (12) is connected with a back-blowing air compressor (14), the exhaust fan (13) is connected with an exhaust gas discharge pipeline (15), a plurality of blowing pipes (16) are arranged below the collecting cover (9) and are uniformly distributed with a plurality of blowing openings (17) on the blowing pipes (16), one end of the blowing pipes (16) is connected with a blower (18), a grid (30) with the thickness of 20mm and the aperture of 1-2mm is arranged between the blowing pipes (16), the grid (30) is formed by overlapping a plurality of layers of non-magnetic metal meshes in a staggered mode, the distance between two adjacent layers of non-magnetic metal meshes is 1-2mm, the lower surface of the grid (30) is 8-11mm away from the upper surface of a material bearing section of the belt (6), the magnetic system (7) is arranged on the magnetic system reciprocating trolley (19), the magnetic system reciprocating trolley (19) is arranged on the frame (1) and is connected with a reciprocating mechanism (20) on the magnetic system reciprocating trolley (19), and the magnetic system reciprocating trolley (19) is connected with the blower (16) through the connecting rod (21) and the blowing pipes (18);
the joint selection method of the horizontal wind-magnetic synchronous joint selection device for the magnetic materials comprises the following steps:
A. after powdery material with the granularity of 0-1mm is added from a powdery material feeding hopper (8), the powdery material is evenly spread on a horizontal belt (6) according to the thickness of 3-5mm under the action of a distributing device (27);
B. after the powdery material moves along with the belt (6) and enters a magnetic field area of the magnetic system (7), magnetic particles in the powdery material are adsorbed by a first group of magnets in the magnetic system (7) under the action of magnetic field force, and the adsorbed magnetic particles generate magnetic agglomeration phenomenon and are mixed with non-magnetic particles;
C. when the powdery material moves horizontally along with the belt (6) to the 'zero field intensity' area of the magnetic field, air with the air speed of 30-40m/s is blown to the surface of the material through an air blowing opening (17) on a blowing pipe (16), part of non-magnetic particles mixed in the magnetic agglomerated material are blown out of the material surface and are taken away along with air flow and then are collected through a collecting cover (9);
D. then the material continuously moves along with the belt (6) to enter the magnetic field area of the second group of magnets, and the materials are carefully selected again; the magnetic materials in the magnetic materials can be enriched step by step through multiple times of wind-magnetic coupling selection, and concentrate is produced;
E. after the concentrate is transported out of the magnetic field area of the magnetic system through the belt (6), the concentrate is scraped from the belt (6) by the scraping plate (4) when passing through the unloading belt pulley (3) and enters the concentrate bin (5) for storage;
F. air which is blown into the material layer through a blowing opening (17) on the blowing pipe (16) overflows the material layer and carries a large amount of fine granular materials, and most of fluidized fine particles are mutually adsorbed to form coarse magnetic materials along with the air in the process of flowing through the grid (30), sink and are bound again by the magnetic system (7);
G. the positive pressure gas-solid two-phase flow discharged from the grid (30) enters a negative pressure area, flows through the cloth bag collector (10), collects tailing powder, and discharges clean air after being pressurized by the exhaust fan (13).
2. The horizontal wind-magnetic synchronous joint selection device for magnetic materials according to claim 1, wherein the horizontal wind-magnetic synchronous joint selection device is characterized in that: the powder material hopper (8) is provided with a vibration distributing device (27).
3. The horizontal wind-magnetic synchronous joint selection device for magnetic materials according to claim 2, wherein the horizontal wind-magnetic synchronous joint selection device is characterized in that: the reciprocating mechanism (20) is a crank-link mechanism fixed on the frame (1).
4. The horizontal wind-magnetic synchronous joint selection device for magnetic materials according to claim 1, wherein the horizontal wind-magnetic synchronous joint selection device is characterized in that: the bottom of the collecting cover (9) is provided with a rubber apron (28), and the inner wall of the collecting cover (9) is provided with a guide plate (29).
5. The horizontal wind-magnetic synchronous joint selection device for magnetic materials according to claim 1, wherein the horizontal wind-magnetic synchronous joint selection device is characterized in that: the bottom of the material bearing section of the belt (6) is provided with two belt carrier rollers (31), the top of the circulating section of the belt (6) is provided with two belt conveying supporting wheels (32), and the belt conveying supporting wheels (32) are fixed on the frame (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108722667A (en) * | 2018-06-15 | 2018-11-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of magnetic material dry grinding horizontal dry separation device |
| CN108722664A (en) * | 2018-06-15 | 2018-11-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of magnetic material dry grinding drum-type dry separation device |
| CN110292997A (en) * | 2019-06-04 | 2019-10-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | It is a kind of material Iron grade to can be improved and the connection of the rate of recovery selects unit and its screening technique |
| CN114798168B (en) * | 2022-04-26 | 2024-05-24 | 酒泉钢铁(集团)有限责任公司 | Sorting system for wind-magnetic synchronous combined iron ore sorting unit |
| CN115231190B (en) * | 2022-08-18 | 2024-03-08 | 酒泉钢铁(集团)有限责任公司 | Homogenization feeding method for dry grinding dry separator |
| CN116273395B (en) * | 2023-03-08 | 2024-05-28 | 酒泉钢铁(集团)有限责任公司 | Production process for producing iron ore concentrate by multistage dry grinding and dry separation of iron ore |
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