CN115646628B - Magnetic classifier - Google Patents

Magnetic classifier Download PDF

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Publication number
CN115646628B
CN115646628B CN202210620699.6A CN202210620699A CN115646628B CN 115646628 B CN115646628 B CN 115646628B CN 202210620699 A CN202210620699 A CN 202210620699A CN 115646628 B CN115646628 B CN 115646628B
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magnetic
cylinder
classifier
feeding
cone
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CN115646628A (en
Inventor
王书礼
邱冠周
姜涛
王军
张雁生
申丽
谢建平
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Weihai Haiwang Hydrocyclone Co ltd
Central South University
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Weihai Haiwang Hydrocyclone Co ltd
Central South University
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    • 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36—Devices therefor, other than using centrifugal force
    • 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B03B5/66—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type of the hindered settling type
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

Abstract

The invention relates to the technical field of iron ore classifying equipment, in particular to a magnetic classifier which is provided with a classifying cylinder and is characterized in that the classifying cylinder is divided into a cylindrical cylinder and a conical cylinder, the lower part of the cylindrical cylinder is connected with the upper end of the conical cylinder, the outer edge of the upper end of the cylindrical cylinder is wrapped and connected with an overflow trough, the bottom of the overflow trough is connected with an overflow ore discharging pipe, the lower end of the conical cylinder is provided with an underflow ore discharging port, the middle part of the cylindrical cylinder is provided with a feeding cylinder fixed in the middle part of the cylindrical cylinder, the feeding cylinder is connected with a feeding pipe, the classifying cylinder is respectively provided with a top magnetic system, a middle magnetic system and an impact water system, and the magnetic classifier classifies iron ores by combining the top magnetic system, the middle magnetic system and the impact water system.

Description

Magnetic classifier
Technical Field
The invention relates to the technical field of iron ore classifying equipment, in particular to a magnetic classifier which has the advantages of simple structure, convenient use, good classifying effect and high classifying efficiency.
Background
It is well known that in the production of ore beneficiation, the main classifying equipment is hydrocyclones, spiral classifiers and vibrating screens. In the classifying process of iron ore, the dissociation degree of ferromagnetic minerals and nonmagnetic gangue minerals has a great influence on the classifying effect because the density of ferromagnetic minerals is significantly higher than that of nonmagnetic gangue minerals, and the ferromagnetic minerals and nonmagnetic gangue minerals are likely to be completely dissociated in the grinding process, and also are likely to form intergrowth minerals in various proportions, so that the density of mineral particles after grinding is uneven, the density of mineral particles with high iron content (rich magnetic particles) is high, the density of mineral particles with low iron content (low magnetic particles) is relatively small, and the density of gangue minerals is minimum. For equipment which relies on gravity field and centrifugal force field for classification, such as a hydrocyclone, a spiral classifier and the like, when iron ore is classified, under the condition of the interactive influence of particle density and particle size, the classification mismatch rate is higher, fine ferromagnetic mineral particles easily enter coarse particle products (underflow of the cyclone or sand return of the spiral classifier), so that the classification precision and the classification efficiency are greatly reduced, and meanwhile, the sand return amount and the repeated abrasion of minerals in the grinding classification process are easily caused. The screen mesh classification of the vibrating screen is equipment for classifying according to the granularity of mineral particles, cannot be influenced by mineral density, and has the defects of small production capacity of the screen mesh, easy blockage of the screen mesh, high equipment investment cost and unfavorable popularization in a large scale.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides the magnetic classifier which has the advantages of simple structure, convenient use, good classifying effect and high classifying efficiency.
The technical scheme adopted for solving the technical problems is as follows:
a magnetic classifier is provided with a classifying cylinder and is characterized in that the classifying cylinder is divided into a cylindrical cylinder and a conical cylinder, the lower end of the cylindrical cylinder is connected with the upper end of the conical cylinder, the outer edge of the upper end of the cylindrical cylinder is wrapped and connected with an overflow trough, the bottom of the overflow trough is connected with an overflow ore discharge pipe, the lower end of the conical cylinder is provided with an underflow ore discharge port, the middle part of the cylindrical cylinder is provided with a feeding cylinder fixed in the middle of the cylindrical cylinder, the feeding cylinder is connected with a feeding pipe, the classifying cylinder is respectively provided with a top magnetic system, a middle magnetic system and an impact water system, the top magnetic system is arranged above the overflow trough and comprises a top coil, a magnetic conduction rod, a support and a magnetic conduction cylinder, one end of the magnetic conduction rod is fixed on the cylindrical cylinder through the support, the other end of the magnetic conduction rod is connected with the upper end of the magnetic conduction cylinder, the lower end of the magnetic conduction cylinder extends into the feeding cylinder and extends out of the lower end of the feeding cylinder through the magnetic ring, the middle magnetic system is arranged at the upper end of the cylindrical cylinder below the overflow trough and comprises an annular magnetic conduction ring, the middle magnetic system and a bracket, the annular magnetic system is wound on the middle magnetic system is respectively provided with a top magnetic system and an impact water system, the top magnetic system is arranged on the cylindrical side wall of the cylindrical cylinder and the cylindrical water system is connected with the water system through the side wall and the impact water system, the side wall is connected with the conical water system through the annular magnetic system and the side wall and the impact water system.
The invention discloses a bottom flow discharge flow regulating assembly arranged at the central axis of a classifying cylinder, which comprises a regulating screw rod, a regulating nut, a discharge lump and a rotary rod, wherein the upper end of the magnetic conduction cylinder is fixedly connected with the regulating nut, the upper end of the regulating screw rod is connected with the rotary rod through the extension of the regulating nut fixed at the upper end of the middle part of the magnetic conduction cylinder, the lower end of the regulating screw rod is extended to the bottom flow discharge port through the lower end of the magnetic conduction cylinder, the discharge lump is of a block structure with the diameter smaller at the lower end and gradually increased at the upper end, the rotary rod drives the regulating screw rod to rotate so as to realize lifting of the discharge lump, and finally, the opening size of the bottom flow discharge port is regulated so as to realize flow regulation.
The magnetic conductive rods in the top magnetic system are provided with even groups, the magnetic conductive rods of the even groups are uniformly distributed on the circumferential direction of the magnetic conductive cylinder, the magnetic conductive rods are respectively wound with top coils, and the magnetic conductive bodies are fixed on the cylinder or the overflow groove through the support.
The middle magnetic system is provided with at least 1 layer along the upper part of the cylinder towards the lower part, and the magnetic force adjustment of different heights of the cylinder is realized by controlling the magnetic field intensity and magnetism through the multi-layer middle magnetic system.
The magnetic field intensity of the middle magnetic system gradually decreases from the upper side to the lower side.
The bracket, the classifying cylinder and the feeding cylinder are all made of non-magnetic materials.
The four groups of magnetic conduction rods in the top magnetic system are distributed on the circumference of the magnetic conduction cylinder in a cross shape, and the four groups of magnetic conduction rods are in central symmetry and axial symmetry, so that the magnetic force of the magnetic conduction cylinder is uniform and stable, and the magnetic field intensity of the top is ensured to meet the requirement.
The middle magnetic system is provided with 1-5 layers along the upper part of the cylindrical drum towards the lower part.
The coil number of the middle coil in the middle magnetic system gradually decreases from the upper layer to the lower layer, and the strength of the induction magnetic field can be controlled by the coil number or the electrified current.
The conical cylinder comprises an upper conical cylinder, a middle straight cylinder and a lower conical cylinder, wherein the upper conical cylinder, the middle straight cylinder and the lower conical cylinder are sequentially connected from top to bottom, the upper end of the upper conical cylinder is connected with a cylindrical cylinder, an underflow ore discharge port is arranged at the bottom of the lower conical cylinder, a water inlet pipe extends into the conical cylinder through the side wall of the upper conical cylinder and is connected with a water distributing disc, a cyclone feeding pipe is arranged on the side face of the middle straight cylinder, the cyclone feeding pipe is in feeding connection with the middle straight cylinder in a tangential line and spiral line mode, a feeding medium of the cyclone feeding pipe is water, and the feeding end of the cyclone feeding pipe is level with the lower end of the upper conical cylinder.
By adopting the structure, the magnetic classifier has the advantages of simple structure, convenience in use, good classifying effect, high classifying efficiency and the like.
Drawings
FIG. 1 is a schematic view of the structure and water flow direction of the present invention.
Fig. 2 is a perspective view of the structure of the present invention.
Fig. 3 is a top view of fig. 1.
Fig. 4 is a top view of the water distribution tray and inlet tube of fig. 1.
Fig. 5 is a schematic view showing the structure of the cone divided into an upper cone, a middle straight cone and a lower cone in the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in the drawing, a magnetic classifier is provided with a classifying cylinder and is characterized in that the classifying cylinder is divided into a cylindrical cylinder 1 and a conical cylinder 2, the lower part of the cylindrical cylinder 1 is connected with the upper end of the conical cylinder 2, the outer edge of the upper end of the cylindrical cylinder 1 is wrapped and connected with an overflow groove 7, the bottom of the overflow groove 7 is connected with an overflow ore discharging pipe 8, the lower end of the conical cylinder 2 is provided with an underflow ore discharging port 9, the middle part of the cylindrical cylinder 1 is provided with a feeding cylinder 5 fixed in the middle part of the cylindrical cylinder 1, the feeding cylinder 5 is connected with a feeding pipe 14, the classifying cylinder is respectively provided with a top magnetic system, a middle magnetic system and an impact water system, the top magnetic system is arranged above the overflow groove 7 and comprises a top coil 3, a magnetic conducting rod 12, a bracket 13 and a magnetic conducting cylinder 4, the top coil 3 is wound on the magnetic conducting rod 12, one end of the magnetic conducting rod 12 is fixed on the cylindrical cylinder 1 through the bracket 13, the other end of the magnetic conduction rod 12 is connected with the upper end of the magnetic conduction barrel 4, the lower end of the magnetic conduction barrel 4 stretches into the feeding barrel 5 and stretches out through the lower end of the feeding barrel 5, the middle magnetic system is arranged at the upper end of the cylindrical barrel 1 below the overflow groove 7 and comprises an annular magnetic conduction ring, a middle coil 10 and a bracket 17, the annular magnetic conduction ring is wound with the middle coil 10, the annular magnetic conduction ring after the winding of the middle coil 10 is arranged above the bracket 17, the bracket 17 is connected with the outer wall of the cylindrical barrel 1, the impact water system is arranged on the side wall of the conical barrel 2 and comprises a water inlet pipe 6 and a water distribution disc 16, the water inlet pipe 6 stretches into the conical barrel 2 through the side wall of the conical barrel 2 and is connected with the water distribution disc 16, the water distribution disc 16 is arranged at the lower position of the feeding barrel 5 and discharges water towards the direction of the feeding barrel 5, and the iron ore is classified by combining the top magnetic system, the middle magnetic system and the impact water system.
Further, the central axis position of classifying section of thick bamboo be equipped with underflow ejection of compact flow regulation subassembly, underflow ejection of compact flow regulation subassembly includes adjusting screw 11, adjusting nut, ore removal lump 15, rotary rod, the upper end fixed connection adjusting nut of magnetic conduction section of thick bamboo 4, the upper end of adjusting screw 11 stretch out through the adjusting nut that magnetic conduction section of thick bamboo 4 middle part upper end is fixed and be connected with the rotary rod, the lower extreme of adjusting screw 11 stretches out and stretches to underflow ore discharge port 9 through magnetic conduction section of thick bamboo 4 lower extreme, ore removal lump 15 set into the cubic structure that the little upper end diameter of lower extreme increases gradually, drive adjusting screw 11 through the rotary rod and rotate and then realize the lift of ore removal lump 15, finally realize adjusting the opening size of underflow ore discharge port 9 and then realize flow control.
Furthermore, the magnetic conductive rods 12 in the top magnetic system are provided with even groups, the magnetic conductive rods 12 of the even groups are uniformly distributed on the circumference direction of the magnetic conductive cylinder 4, the top coils 3 are respectively wound on the magnetic conductive rods 12, and the magnetic conductive bodies are fixed on the cylinder 1 or the overflow groove 7 through the support 13.
Further, the middle magnetic system is provided with at least 1 layer along the upper part of the cylinder 1 towards the lower part, and the multi-layer middle magnetic system controls the magnetic field intensity to realize the magnetic force adjustment of different heights of the cylinder 1.
Further, the magnetic field intensity of the middle magnetic system gradually decreases from the upper side to the lower side.
Further, the bracket 13, the bracket 17, the classifying cylinder and the feeding cylinder 5 are all made of non-magnetic materials.
Further, the four groups of magnetic conduction rods 12 in the top magnetic system are arranged, the four groups of magnetic conduction rods 12 are distributed on the circumference of the magnetic conduction cylinder 4 in a cross shape, the four groups of magnetic conduction rods 12 are in central symmetry and axial symmetry, the magnetic force uniformity and stability of the magnetic conduction cylinder can be realized, and the magnetic field intensity at the top is ensured to meet the requirement.
Further, the middle magnetic system is provided with 1-5 layers along the upper part of the cylindrical drum 1 towards the lower part.
Further, the number of coils of the middle coil 10 in the middle magnetic system is gradually reduced from the upper layer to the lower layer, and the strength of the induced magnetic field can be controlled by the number of coils or the energizing current.
Further, the cone section of thick bamboo include last cone section of thick bamboo 18, well straight section of thick bamboo 19 and lower cone section of thick bamboo 20, last cone section of thick bamboo 18, well straight section of thick bamboo 19 and lower cone section of thick bamboo 20 connect gradually from top to bottom, the upper end and the cylinder section of thick bamboo of last cone section of thick bamboo 18 be connected, the bottom of lower cone section of thick bamboo 20 is equipped with the underflow ore discharge mouth, the inlet tube stretch into the cone section of thick bamboo inside and connect the water distribution dish through last cone section of thick bamboo 18 lateral wall, the side of well straight section of thick bamboo 19 be equipped with whirl inlet pipe 21, whirl inlet pipe 21 and well straight section of thick bamboo 19 be tangent line, helix mode feeding connection, the feeding medium of whirl inlet pipe 21 be water, the feed end of whirl inlet pipe 21 and the lower extreme parallel and level of last cone section of thick bamboo 18, the thick liquid that last cone section of thick bamboo 18 left is carried out whirl impact motion by the water that whirl inlet pipe 21 added in the moment that contracts down, fine particle weak magnetism mineral that need not to scatter inside, the whirl effect through lower cone section of thick bamboo 20 again, fine particle weak magnetism mineral moves upwards, and then fully selects magnetism mineral, and the magnetic mineral, and the further, and the grinding rate is reduced through the later grinding stage of grinding the ore, and the end is lower through the burden and the grinding stage 200.
The above-mentioned water diversion disk 16 is arranged to feed the upward dispersed water flow to play the role of impact force on the particles, and meanwhile, the material adsorbed by the magnetic force on the feeding cylinder 5 can be prevented from being blown away, the top magnetic system is arranged not only for generating the magnetic field intensity at the top of the cylinder 1, but also for transmitting the magnetism generated by the top coil 3 to the magnetic conduction cylinder 4 through the magnetic conduction rod 12, and the magnetic conduction cylinder 4 with magnetism can generate the magnetic force on the particles at the center inside the cylinder 1, so that the magnetism in the whole cylinder 1 can be ensured to be uniform and stable.
Above-mentioned magnetic force separator's feeding mode gets into from the middle part of cylinder, and do not adopt the side feeding mode of swirler, the overflow mode of overflow groove is also adopted in the overflow mode moreover, this patent is different from traditional hydrocyclone, traditional hydrocyclone is because get into the material through cylinder side, it adopts magnetic field interference only can suspend the granule that has magnetism always in the top of cylinder, and can not pass through overflow or underflow to be discharged, the overflow groove form of this patent will have the granule of magnetism to be discharged through the overflow, better improvement separation effect.
The cone section of thick bamboo in the above-mentioned magnetic force sorter divide into cone section of thick bamboo 18, well straight section of thick bamboo 19 and lower cone section of thick bamboo 20, be equipped with whirl inlet pipe 21 on the lateral wall of well straight section of thick bamboo 19, the mineral that falls down with last cone section of thick bamboo 18 carries out the whirl separation here through the mode of whirl feeding, also can select separately again with the weak magnetic material of fine particle, and then increase the separation of magnetic product as far as possible, need not to increase whirl equipment moreover, directly select the product, the upper end of whirl inlet pipe is direct to be fed in last cone section of thick bamboo below moreover, can make the boring that flows towards the below directly driven the whirl by the medium in the whirl inlet pipe, make the whirl effect better, the separation effect is better.
The settings of the magnetic force parameters and the impact flow rate parameters of the magnetic system corresponding to the top magnetic system, the middle magnetic system and the impact water system of the magnetic separator are selected according to the corresponding ore, so the selection of the parameters is not limited in scope.
The magnetic classifier is a gravity interference sedimentation classifying device, and applies upward magnetic field force and upward water flow driving force on the basis, wherein the magnetic field force comprises magnetic field force action generated by a top magnetic system and a middle magnetic system together, so that magnetic particles are subjected to self gravity G and upward magnetic force F in the sedimentation process Magnetic field Self-buoyancy F of particles Floating device Driving force F for rising water flow Punching machine And the like (in addition to the impact of forces such as collisions between particles, collisions between particles and the cylinder, etc. are small, negligible).
When the gravity G of the particles is greater than F Magnetic field +F Floating device +F Punching machine As the particles move downward.
When the gravity G of the particles is equal to F Magnetic field +F Floating device +F Punching machine The particles are in suspension and randomly move up or down with mechanical entrainment.
When the gravity G of the particles is less than F Magnetic field +F Floating device +F Punching machine As the particles move upward.
The movement direction of the particles can be changed by adjusting the magnetic field strength and the flow speed of the ascending water flow, for example, the ferromagnetic minerals dissociated from the monomers can move upwards under the combined action of the upward magnetic field suction force and the ascending water flow driving force and enter overflow products although the density is high and the free sedimentation speed is high. The non-magnetic (weak magnetic) coarse mineral particles are small in magnetic field attraction and relatively large in self gravity, so that the driving force of ascending water flow can be overcome, and the coarse mineral particles are settled downwards into an underflow product, and the classification process is completed.
The magnetic classifier solves the problem that ferromagnetic mineral particles easily enter an underflow coarse-size-fraction product, thereby improving classification efficiency and reducing repeated grinding of fine-particle ferromagnetic minerals in a grinding classification loop. In order to make the equipment have wider adaptability to different iron ore classification, the external magnetic field can be set to be an electromagnetic field with adjustable magnetic field intensity, and meanwhile, the flow speed, the flow quantity and the water outlet pressure of rising water flow can be continuously adjusted.
Since the top coil 3 and the middle coil 10 are provided, the top coil 3 transmits a magnetic field through the magnetic conductive cylinder 4, and the middle coil 10 serves as a supplementary magnetic field to strengthen the magnetic field strength inside the graded cylinder and optimize the magnetic field gradient. The middle coil 10 can be designed into 1-5 groups of exciting coils with different field strengths from top to bottom, the more the groups are, the better the magnetic field gradient linking effect in the vertical direction is, the common effect of the induction top coil 3 and the middle coil 10 is that the magnetic induction intensity weakened from top to bottom is generated inside the classifying cylinder, the magnetic induction intensity at the top end of the classifying cylinder is maximum, so that magnetic particles are subjected to continuous upward magnetic force, and the magnetic field intensity difference of the same level is small. The top coil 3 and the middle coil 10 are designed into adjustable electromagnetic magnetic field structures so as to adjust the intensity and the magnetic field gradient of the internal magnetic field and adapt to classification of different magnetic ores, for example, the internal magnetic field is adjusted to be 20-40mT of the middle-lower magnetic field in the classifying barrel, the intensity of the middle magnetic field is 30-50 mT, and the gradient of the upper magnetic field is 40-70 mT.
The water inlet pipe 6 on the side wall of the conical cylinder 2 is fed with water flow and water quantity with certain pressure, relatively uniform ascending water flow is formed through the water diversion disk 16, the water diversion disk 16 is positioned below the magnetic conduction cylinder 4, and the magnetic minerals can be prevented from being adsorbed on the surface of the feeding cylinder 5 along the lower edge of the magnetic conduction cylinder 4 through flushing of the water flow. The flow speed of the rising water flow is generally adjustable between 3 cm/s and 10cm/s, and the pressure of the rising water flow is adjustable between 50kPa and 150 kPa.
The flow of the underflow ore discharge port 9 is designed into an adjustable structure, so that the concentration of the underflow ore discharge can be conveniently adjusted according to the size of the material entering the underflow.
Ore pulp to be classified is input into the feeding cylinder 5 through the feeding cylinder 5 and enters the cylinder 1 through the feeding pipe 14, and the magnetic classifier topThe part coil 3, the middle coil 10 and the middle magnetic conduction cylinder 4 together generate a strong and weak magnetic field from top to bottom, and the magnetic field force is vertically upward. The mineral particles are subjected to upward water flow driving force F by the uniform upward water flow generated by the water distribution plate 16 Punching machine The magnetic particles are subjected to upward magnetic force F in the classifying cylinder Magnetic field Upward water flow driving force F Punching machine Buoyancy F in upward direction Floating device And the resultant of gravity G downward itself. By adjusting the flow speed of the ascending water flow and the intensity of an external magnetic field, fine-fraction ferromagnetic mineral particles (ferromagnetic minerals) can float upwards, then the overflow groove 7 at the top of the cylinder 1 is discharged, and the gravity G of other coarse-fraction non-magnetic (weakly magnetic) minerals is larger than the ascending water flow lifting force F Punching machine Self-buoyancy F Floating device Weak magnetic force F Magnetic field The magnetic classifier moves downwards and enters the bottom of the conical cylinder 2, and enters the underflow product from the underflow ore discharge port 9 at the bottom of the conical cylinder 2, thereby completing the classifying process.
The invention solves the problem that ferromagnetic mineral particles easily enter an underflow coarse-fraction product, improves the classification efficiency and reduces the excessive grinding of monomer dissociated ferromagnetic minerals.
An embodiment of the structure according to the invention is as follows:
example 1
Embodiments employing a single cone
The granularity of the grading raw material of the equipment is 42.5 percent of the content of-200 meshes, the content of magnetic iron is 45 percent of magnetite powder, and the magnetite powder and water are prepared into 30 percent of mass concentration and are fed into the grading cylinder through the feeding cylinder 5. The middle coil 10 is designed into an upper group and a lower group, the upper part of the magnetic field intensity generated by the top coil 3 and the middle coil 10 in the classifying cylinder is strong, the middle lower part of the magnetic field intensity is weak, the magnetic field intensity below the hollow magnetic cylinder 4 is 20-30 mT, the magnetic field intensity at the upper edge of the cylinder is 50-65 mT, the lower part of the magnetic field is gradually weakened, the ascending water flow velocity in the classifying cylinder is 5 cm/s, the pressure of the water inlet pipe 6 is 90kPa, the opening amplitude of the bottom ore discharge port is about one third, and the classification result comparison of the conventional cyclone and the classifying table is shown in the following table.
Figure 17147DEST_PATH_IMAGE002
From the classification result, the overflow product after being classified by the magnetic classifier has a passing rate of-200 meshes of 67.3 percent and the underflow product has a passing rate of-200 meshes of 8.7 percent, so that the classification functions of finer overflow fineness and coarser underflow granularity are realized. Secondly, the magnetic iron content of the overflow product classified by the magnetic classifier reaches 52% and is higher than that of the magnet of 45% of the feeding material, and the magnetic iron content in the underflow product is reduced to 37%, which indicates that the magnetic particles with higher monomer dissociation degree are more easily enriched in the overflow product, and the large-density monomer dissociation magnetic particles can be effectively reduced to enter the underflow product.
And the traditional cyclone is adopted for classification, under the condition that the product distribution rate is basically equivalent to that of a magnetic classifier, the magnetic iron content in the underflow product of the cyclone reaches 49%, the magnetic iron content in the overflow product is reduced to 39%, the granularity of the underflow product of the cyclone is analyzed to be 12.8% of the passing rate of 200 meshes, the fine fraction content is higher than the granularity of the underflow product of the magnetic classifier by 8.7% of the passing rate of 200 meshes, the cyclone underflow product is more easily enriched with magnetic particles of high-density fine fraction, which is disadvantageous in classification of a grinding circuit, and the magnetic classifier can be remarkably improved.
Example 2
Embodiments of the cone comprising an upper cone 18, a middle straight cone 19 and a lower cone
The granularity of the grading raw material of the equipment is 42.5 percent of the content of-200 meshes, the content of magnetic iron is 45 percent of magnetite powder, and the magnetite powder and water are prepared into 30 percent of mass concentration and are fed into the grading cylinder through the feeding cylinder 5. The middle coil 10 is designed into an upper group and a lower group, the upper part of the generated magnetic field intensity of the top coil 3 and the middle coil 10 in the classifying cylinder is strong, the middle lower part of the generated magnetic field intensity of the middle coil 10 is weak, the magnetic field intensity of the lower part of the hollow magnetic cylinder 4 is 20-30 mT, the magnetic field intensity of the upper edge of the cylinder is 50-65 mT, the lower part of the magnetic field is gradually weakened, the ascending water flow velocity in the classifying cylinder is 5 cm/s, the pressure of the water inlet pipe 6 is 90kPa, the inlet medium of the cyclone inlet pipe is water, the inlet pressure is 90kPa, the opening amplitude of the bottom ore discharge opening is about one third, and meanwhile, the conventional cyclone is compared with the classifying result of the patent, as shown in the following table.
Figure DEST_PATH_IMAGE003
From the classification results, the overflow product after classification by the magnetic classifier has a passing rate of-200 meshes of 70.2% and the underflow product has a passing rate of-200 meshes of 3.2%, so that the classification functions of finer overflow fineness and coarser underflow granularity are realized, and the effect is due to the embodiment 1. Secondly, the magnetic iron content of the overflow product classified by the magnetic classifier reaches 59% which is higher than the magnetic iron content of 45% of the feeding material, and the magnetic iron content in the underflow product is reduced to 27%, which means that the magnetic particles with higher monomer dissociation degree are more easily enriched in the overflow product, so that the large-density monomer dissociation magnetic particles can be effectively reduced to enter the underflow product, and the fine particles are weakly magnetic and can also be in the overflow product, thereby achieving the purpose of higher magnetic content.
And the traditional cyclone is adopted for classification, under the condition that the product distribution rate is basically equivalent to that of a magnetic classifier, the magnetic iron content in the underflow product of the cyclone reaches 49%, the magnetic iron content in the overflow product is reduced to 39%, the granularity of the underflow product of the cyclone is analyzed to be 12.8% of the passing rate of 200 meshes, the fine fraction content is higher than the granularity of the underflow product of the magnetic classifier by 8.7% of the passing rate of 200 meshes, the cyclone underflow product is more easily enriched with magnetic particles of high-density fine fraction, which is disadvantageous in classification of a grinding circuit, and the magnetic classifier can be remarkably improved.
The data in the comparison of the classification results of the conventional cyclone and the present patent in the above two embodiments are all actual measurement values, and the measurement results deviate from the theoretical values, and the deviation range does not affect the actual results of the present patent.

Claims (9)

1. A magnetic classifier is composed of a classifying cylinder consisting of cylindrical cylinder and conic cylinder, an overflow slot for connecting said cylindrical cylinder, a magnetic tube for feeding said cylindrical cylinder, a feeding tube for feeding said cylindrical cylinder, and a feeding tube for feeding said cylindrical tube, and a top magnetic system consisting of top coil, magnetic rod, supporter and magnetic tube, and a magnetic guide tube for winding said top coil on said magnetic rod, the middle magnetic system is arranged at the upper end part of the cylinder below the overflow groove and comprises an annular magnetic conduction ring, a middle coil and a bracket, the annular magnetic conduction ring is wound with the middle coil, the annular magnetic conduction ring after being wound with the middle coil is arranged above the bracket, the bracket is connected with the outer wall of the cylinder, the impact water system is arranged on the side wall of the cylinder and comprises a water inlet pipe and a water distribution disc, the water inlet pipe extends into the inside of the cylinder through the side wall of the cylinder and is connected with the water distribution disc, the water distribution disc is arranged at the lower position of the cylinder and outputs water towards the direction of the cylinder, the iron ore is classified by combining the top magnetic system, the middle magnetic system and the impact water system, the cylinder comprises an upper cone, a middle straight cylinder and a lower cone, the upper cone, the middle straight cylinder and the lower cone are sequentially connected from top to bottom, the upper end of the upper cone is connected with the cylinder, the bottom of the lower cone is provided with an underflow ore discharge port, the inlet tube stretch into the cone through last cone lateral wall and connect the water distribution dish, the side of well straight section of thick bamboo be equipped with the whirl inlet pipe, the whirl inlet pipe be tangent line, helix mode feeding connection with well straight section of thick bamboo, the feeding medium of whirl inlet pipe be water, the feed end of whirl inlet pipe and the lower extreme parallel and level of last cone.
2. The magnetic classifier as claimed in claim 1, wherein the central axis of the classifying cylinder is provided with an underflow discharge flow adjusting assembly, the underflow discharge flow adjusting assembly comprises an adjusting screw, an adjusting nut, a ore discharging lump and a rotating rod, the upper end of the magnetic guiding cylinder is fixedly connected with the adjusting nut, the upper end of the adjusting screw extends out of the adjusting nut fixed at the upper end of the middle part of the magnetic guiding cylinder and is connected with the rotating rod, the lower end of the adjusting screw extends out of the lower end of the magnetic guiding cylinder and extends to the underflow ore discharging port, the ore discharging lump is of a block structure with the diameter of the lower end smaller than that of the upper end of the magnetic guiding cylinder and gradually increased, the rotating rod drives the adjusting screw to rotate so as to realize lifting of the ore discharging lump, and finally, the opening size of the underflow ore discharging port is adjusted so as to realize flow adjustment.
3. The magnetic classifier as claimed in claim 1, wherein the magnetic conductive bars in the top magnetic system are provided with even groups, the even groups of magnetic conductive bars are uniformly distributed in the circumferential direction of the magnetic conductive cylinder, the magnetic conductive bars are respectively wound with a top coil, and the magnetic conductive body is fixed on the cylinder or the overflow trough through a bracket.
4. The magnetic classifier as claimed in claim 1, wherein the middle magnetic system has at least 1 layer along the upper side of the cylinder toward the lower side, and the magnetic force adjustment of different heights of the cylinder is realized by controlling the magnetic field intensity by the multi-layer middle magnetic system.
5. A magnetic classifier as defined in claim 4, wherein the magnetic field strength of the middle magnetic system decreases gradually from above toward below.
6. The magnetic classifier as claimed in claim 1, wherein the support, the bracket, the classifying cylinder and the feeding cylinder are all made of non-magnetic materials.
7. A magnetic classifier as claimed in claim 3, wherein the magnetic conductive bars in the top magnetic system are four groups of magnetic conductive bars distributed on the circumference of the magnetic conductive cylinder in a cross shape.
8. A magnetic classifier as claimed in claim 4, wherein the central magnet system has 1-5 layers along the upper side of the cylinder towards the lower side.
9. A magnetic classifier as defined in claim 8, wherein the middle coil in the middle magnetic system has a gradually decreasing number of coils from the upper layer toward the lower layer.
CN202210620699.6A 2022-04-12 2022-06-02 Magnetic classifier Active CN115646628B (en)

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CN2416959Y (en) * 2000-04-13 2001-01-31 鞍钢集团弓长岭矿业公司 Magnetic-gravity ore dressing machine
CN2920414Y (en) * 2006-06-13 2007-07-11 王常任 Concentration machine for magnetic iron ore
CN201197960Y (en) * 2008-05-14 2009-02-25 鞍钢集团矿业公司 Novel permanent magnetism tower and ring combined magnetic system dewatering channel
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