CN118527238B - A kind of magnetite dry grinding and dry separation processing technology - Google Patents
A kind of magnetite dry grinding and dry separation processing technology Download PDFInfo
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- CN118527238B CN118527238B CN202411017316.1A CN202411017316A CN118527238B CN 118527238 B CN118527238 B CN 118527238B CN 202411017316 A CN202411017316 A CN 202411017316A CN 118527238 B CN118527238 B CN 118527238B
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- iron
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- 238000000926 separation method Methods 0.000 title claims abstract description 23
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000009837 dry grinding Methods 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 161
- 229910052742 iron Inorganic materials 0.000 claims abstract description 73
- 239000012141 concentrate Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 29
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 27
- 239000011707 mineral Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000006148 magnetic separator Substances 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 8
- 239000000741 silica gel Substances 0.000 claims description 8
- 229910002027 silica gel Inorganic materials 0.000 claims description 8
- 239000000696 magnetic material Substances 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 12
- 230000006378 damage Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- 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
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
- B03C1/12—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with magnets moving during operation; with movable pole pieces
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
本发明公开了应用于选矿领域的一种磁铁矿干磨干选加工工艺，该工艺通过在现有破碎、碾磨、粉磨工艺的基础上配合多梯度干式磁选机和干式摇摆铁精粉提纯机的使用，有效简化了工艺流程，同时减少了设备的使用，进而有效降低能源消耗，并且能有效提高铁矿资源的回收效率，避免铁资源的流失，通过干选工艺能有效降低水资源的使用，避免水资源过度消耗，而且降低水资源的消耗还能有效避免对环境的破坏，另外干式摇摆铁精粉提纯机能有效提高铁粉的回收率，实现铁矿资源的高效回收，还能有效降低水资源和能源的过度消耗，从而有效保护环境。
The invention discloses a magnetite dry grinding and dry separation processing technology applied to the field of mineral processing. The technology effectively simplifies the process flow and reduces the use of equipment by using a multi-gradient dry magnetic separator and a dry swing iron ore concentrate purifier on the basis of existing crushing, grinding and powder grinding processes, thereby effectively reducing energy consumption, and can effectively improve the recovery efficiency of iron ore resources and avoid the loss of iron resources. The dry separation process can effectively reduce the use of water resources and avoid excessive consumption of water resources. Reducing the consumption of water resources can also effectively avoid damage to the environment. In addition, the dry swing iron ore concentrate purifier can effectively improve the recovery rate of iron powder, realize efficient recovery of iron ore resources, and effectively reduce excessive consumption of water resources and energy, thereby effectively protecting the environment.
Description
Technical Field
The invention relates to the field of mineral separation, in particular to a magnetite dry grinding and dry separation processing technology.
Background
The iron ore is a large country of steel, but the iron ore resources are relatively deficient, and most of the iron ore resources belong to lean ores and ultra-lean ores, the raw ore grade is low, the ore inlaid granularity is fine, and the accompanying elements and gangue minerals are more mingled.
Aiming at the existing mineral separation technical flow of low-grade ores, lean ores and ultra-lean magnetite ores, the method is basically characterized in that raw ore is subjected to primary crushing, primary dry magnetic separation, secondary fine crushing, secondary dry magnetic separation, primary ball mill, primary magnetic separator process, spiral classifier, secondary ball mill, secondary magnetic separator process, high-frequency vibration sieve, elutriator and filter to obtain finished iron concentrate powder. The beneficiation method is a process flow adopted by most iron ore enterprises at present, but the existing beneficiation process has the defects of more equipment, high equipment energy consumption, large water consumption, high requirements on the tailing reservoir capacity and incapability of effectively recycling waste materials. Moreover, the existing mineral separation process causes great damage to the natural environment, and the excessive use of water resources has caused great threat to ecological balance.
Therefore, the technical scheme solves the problems of low iron ore resource recovery rate, high water resource consumption and easy ecological environment destruction of the existing mineral separation process.
Disclosure of Invention
The invention aims to improve the mineral separation process in the prior art, and provides a magnetite dry-grinding dry-separation processing process compared with the prior art, the process flow is effectively simplified by matching the use of a multi-gradient dry magnetic separator and a dry-type swinging iron fine powder purifier on the basis of the prior crushing, grinding and grinding processes, meanwhile, the use of equipment is reduced, the energy consumption is effectively reduced, the recovery efficiency of iron ore resources can be effectively improved, the loss of iron resources is avoided, the use of water resources can be effectively reduced by the dry-separation process, the excessive consumption of water resources is avoided, the consumption of water resources is reduced, the damage to the environment is effectively avoided, and in addition, the recovery rate of iron powder can be effectively improved by the dry-type swinging iron fine powder purifier.
The efficient recovery of the iron ore resources is realized, and the excessive consumption of water resources and energy sources can be effectively reduced, so that the environment is effectively protected.
Further, the dry-type swaying iron fine powder purifying machine in the S4 step comprises a machine case, the upper end of the machine case is connected with a feed hopper, the middle part of the machine case is provided with a roller, the inner walls of the two sides of the machine case are fixedly connected with mounting seats, the two ends of the roller are fixedly connected with hollow rotating shafts matched with the mounting seats, a driving motor is arranged on the outer wall of one side of the machine case, the output end of the driving motor is connected with one of the hollow rotating shafts, the bottom of the machine case is provided with an iron powder blanking port, one side of the iron powder blanking port, which is close to the roller, is fixedly connected with a distributor, the side wall of the machine case, which is close to the distributor, is provided with a material throwing port, a guide plate fixedly connected with the distributor is arranged at the material throwing port, a flushing water pipe is fixedly connected at the symmetrical position of the iron powder blanking port and the distributor, a magnetic supporting shaft is rotationally connected inside the roller, the outer wall of the magnetic supporting shaft is fixedly sleeved with the mounting cylinder, the mounting cylinder is fixedly connected with a magnetic system towards the side wall of the distributor, the side wall of the mounting cylinder opposite to the magnetic system is fixedly connected with a balancing piece, one end of the balancing piece, which is far away from the magnetic system, is fixedly connected with a counterweight piece, the inner wall of the roller is fixedly connected with a plurality of magnetic system driving strips which are distributed in a surrounding manner at equal intervals, the fixed connection of the chassis is limited by a rotating limiter, one end of the magnetic system supporting shaft, which is far away from the driving motor, penetrates through the roller, the hollow rotating shaft and the side wall of the chassis and extends into the rotating limiter, the middle side wall of the rotating limiter is provided with a rotating groove matched with the magnetic system supporting shaft, the magnetic system supporting shaft is rotationally connected with the inner wall of the rotating groove, the side walls of the rotating limiter are provided with rotating limiting grooves communicated with the rotating groove, the inner wall of the rotating limiting groove is provided with two rebound pieces which are symmetrically distributed, the side walls of the two sides of the magnetic system supporting shaft are fixedly connected with positioning plates, the upper side and the lower side of the positioning plate are respectively contacted with the two rebound pieces, the roller is utilized to magnetically absorb the iron concentrate in the mineral powder, the magnetic system driving bar continuously collides with the counterweight piece under the driving of the roller, so that the counterweight piece drives the magnetic system to rotate back and forth to change the magnetic field distributed on the roller, thereby effectively avoiding the formation of large magnetic agglomeration, effectively separating the iron concentrate from carried impurities, effectively improving the purity of the iron concentrate, limiting the rotating range of the magnetic system by the rebound piece, and effectively accelerating the frequency of the magnetic system to rotate back and forth by the rebound piece depending on the elasticity of the rebound piece, thereby further effectively improving the purifying effect.
Furthermore, the key points of the mounting cylinder, the magnetic system, the balance piece and the weight piece are positioned on the axis of the magnetic system supporting shaft, the balance piece and the weight piece are made of non-magnetic materials, the magnetic system is kept balanced by utilizing the lever principle, the magnetic system is prevented from deflecting to one side and cannot rotate back and forth, and meanwhile, the balance piece and the weight piece are influenced by the magnetic field of the magnetic system, so that the balance piece and the weight piece are made of non-magnetic materials.
Further, the distance between the outermost end of the magnetic system and the inner wall of the roller is larger than the width of the magnetic system driving strip, and the distance between the outermost end of the weight piece and the inner wall of the roller is smaller than the width of the magnetic system driving strip, so that the magnetic system driving strip does not collide with the magnetic system driving strip when passing through the magnetic system, and the magnetic system driving strip can rotate through colliding the weight piece when passing through the weight piece, so that the magnetic field distributed on the roller is changed, and large magnetic aggregation is effectively avoided.
Optionally, the magnetic driving strip comprises a wear-resistant outer wrapping film, and the inside of the wear-resistant outer wrapping film is filled with a silica gel filling pad, so that the counterweight does not obstruct the normal rotation of the roller, and vibration and noise are not generated, and the magnetic driving strip adopts the wear-resistant outer wrapping film with friction and the silica gel filling pad with elasticity.
Optionally, the rebound piece includes flexible elasticity arc membrane, and the inner wall fixedly connected with rubber net of flexible elasticity arc membrane, and magnetism system back shaft drives the locating plate extrusion rebound piece when magnetism system rotates, relies on the elasticity of flexible elasticity arc membrane and rubber net to rebound the locating plate, and then lets magnetism system can reset to this effectively accelerates magnetism system round trip pivoted frequency, thereby effectively improves the purification effect of iron ore concentrate.
Compared with the prior art, the invention has the advantages that:
(1) According to the scheme, the multi-gradient dry magnetic separator and the dry swing iron fine powder purifying machine are matched on the basis of the existing crushing, grinding and grinding processes, so that the process flow is effectively simplified, meanwhile, the use of equipment is reduced, the energy consumption is effectively reduced, the recovery efficiency of iron ore resources can be effectively improved, the loss of the iron resources is avoided, the use of water resources can be effectively reduced through the dry separation process, the excessive consumption of the water resources is avoided, the consumption of the water resources is reduced, the damage to the environment can be effectively avoided, in addition, the dry swing iron fine powder purifying machine can effectively improve the recovery rate of iron powder, the efficient recovery of the iron ore resources is realized, the excessive consumption of the water resources and energy sources can be effectively reduced, and the environment is effectively protected.
(2) The roller is utilized to magnetically absorb the iron concentrate in the mineral powder, the magnetic system driving bar continuously collides with the counterweight piece under the driving of the roller, so that the counterweight piece drives the magnetic system to rotate back and forth to change the magnetic field distributed on the roller, thereby effectively avoiding the formation of large magnetic agglomeration, effectively separating the iron concentrate from carried impurities, effectively improving the purity of the iron concentrate, limiting the rotating range of the magnetic system by the rebound piece, and effectively accelerating the frequency of the magnetic system to rotate back and forth by the rebound piece depending on the elasticity of the rebound piece, thereby further effectively improving the purifying effect.
(3) The key points of the mounting cylinder, the magnetic system, the balance piece and the weight piece are positioned on the axis of the magnetic system supporting shaft, the balance piece and the weight piece are made of non-magnetic materials, the magnetic system is kept balanced by utilizing the lever principle, the magnetic system is prevented from deflecting to one side and cannot rotate back and forth, and meanwhile, the balance piece and the weight piece are influenced by the magnetic field of the magnetic system, so that the balance piece and the weight piece are made of non-magnetic materials.
(4) The distance between the outermost end of the magnetic system and the inner wall of the roller is larger than the width of the magnetic system driving strip, and the distance between the outermost end of the weight piece and the inner wall of the roller is smaller than the width of the magnetic system driving strip, so that the magnetic system driving strip does not collide with the magnetic system driving strip when passing through the magnetic system, and the magnetic system can rotate through colliding the magnetic system driving strip when passing through the weight piece, so that the magnetic field distributed on the roller is changed, and large magnetic aggregation is effectively avoided.
(5) The magnetic driving strip comprises a wear-resistant outer wrapping film, and a silica gel filling pad is filled in the wear-resistant outer wrapping film, so that the counterweight piece does not obstruct the normal rotation of the roller, vibration and noise are not generated, and the magnetic driving strip adopts the wear-resistant outer wrapping film and the silica gel filling pad with elasticity.
(6) The rebound piece comprises a flexible elastic arc-shaped film, the inner wall of the flexible elastic arc-shaped film is fixedly connected with a rubber net, and when the magnetic system rotates, the magnetic system supporting shaft drives the positioning plate to extrude the rebound piece, the positioning plate is rebounded by the elasticity of the flexible elastic arc-shaped film and the rubber net, and then the magnetic system can be reset, so that the frequency of the magnetic system rotating back and forth is effectively accelerated, and the purification effect of the iron fine powder is effectively improved.
Drawings
FIG. 1 is a flow chart of a dry grinding and dry separation process for ultra-lean magnetite of the present invention;
FIG. 2 is a flow chart of the dry grinding and dry separation process for low-grade magnetite of the present invention;
FIG. 3 is a perspective anatomic view of the dry rocking iron concentrate refiner of the present invention;
FIG. 4 is a diagram of the connection between a roller and a rotation limiter according to the present invention;
FIG. 5 is a perspective view of the magnetic system of the present invention;
FIG. 6 is a diagram showing a connection structure between a magnetic system support shaft and a rotation limiter according to the present invention;
FIG. 7 is a front view of a magnetic structure of the present invention;
FIG. 8 is a front cross-sectional view of the rotation limiter of the present invention;
fig. 9 is an enlarged view at a in fig. 7.
The reference numerals in the figures illustrate:
1 machine case, 101 iron powder blanking mouth, 2 feeder hopper, 3 roller, 4 mount pad, 5 hollow pivot, 6 driving motor, 7 tripper, 8 stock guide, 9 wash pipe, 10 magnetic system back shaft, 11 mount tube, 12 magnetic system, 13 balancing piece, 14 weight piece, 15 magnetic system drive strip, 1501 wear-resisting outer film, 1502 silica gel filling pad, 16 limit change ware, 1601 groove, 17 rebound piece, 1701 flexible elasticity arc membrane, 1702 rubber net, 18 locating plate.
Detailed Description
The embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings, and it is intended that all other embodiments of the invention, which are apparent to one skilled in the art without the inventive faculty, are included in the scope of the present invention.
Embodiment 1. The invention discloses a magnetite dry grinding and dry separation processing technology, referring to fig. 1 and 2, comprising the following steps:
s1, performing three-section closed circuit crushing of coarse crushing, medium crushing and fine crushing on raw iron ore, repeatedly screening and crushing to obtain mineral aggregate with granularity smaller than 14mm, and pre-selecting by using a multi-gradient dry magnetic separator to obtain primary concentrate, wherein the discarded mineral aggregate is used for building sand aggregates;
S2, feeding the primary concentrate into a high-pressure roller mill for grinding, sieving by using 5mm sieve holes, returning mineral materials with the size larger than 5mm back to the high-pressure roller mill for grinding, preselecting the mineral materials with the size smaller than 5mm by using a multi-gradient dry magnetic separator to obtain preselect concentrate, and using the discarded mineral materials as tailings for comprehensive utilization;
S3, putting the pre-selected refined ore into a vertical mill for grinding, and selecting by using a multi-gradient micro powder dry magnetic separator to obtain primary iron refined powder, wherein the discarded ore is also used as tailings for comprehensive utilization;
S4, the primary iron concentrate is put into a dry swing iron concentrate purifier for purification, so as to obtain the final target iron concentrate, and the residual trace mud is used as tailings for comprehensive utilization;
Referring to fig. 3,4 and 7, the dry swinging fine iron powder purifying machine in step s4 comprises a machine case 1, wherein a feed hopper 2 is connected to the upper end of the machine case 1, a roller 3 is installed in the middle of the machine case 1, mounting seats 4 are fixedly connected to the inner walls of two sides of the machine case 1, hollow rotating shafts 5 matched with the mounting seats 4 are fixedly connected to the two ends of the roller 3, a driving motor 6 is installed on the outer wall of one side of the machine case 1, the output end of the driving motor 6 is connected with one of the hollow rotating shafts 5, an iron powder blanking port 101 is formed in the bottom of the machine case 1, a distributor 7 is fixedly connected to one side of the iron powder blanking port 101 close to the roller 3, a material throwing port is formed in the side wall of the machine case 1 close to the distributor 7, a guide plate 8 fixedly connected to the distributor 7 is placed at the material throwing port, and flushing water pipes 9 are fixedly connected to symmetrical positions of the iron powder blanking port 101 and the distributor 7;
referring to fig. 5, a magnetic system supporting shaft 10 is rotatably connected inside a roller 3, an installation cylinder 11 is fixedly sleeved on the outer wall of the magnetic system supporting shaft 10, a magnetic system 12 is fixedly connected to the side wall of the installation cylinder 11 facing the distributor 7, a balance piece 13 is fixedly connected to the side wall of the installation cylinder 11 facing the magnetic system 12, one end, far away from the magnetic system 12, of the balance piece 13 is fixedly connected with a balance piece 14, the emphasis of the installation cylinder 11, the magnetic system 12, the balance piece 13 and the balance piece 14 is positioned on the axis of the magnetic system supporting shaft 10, the balance piece 13 and the balance piece 14 are made of non-magnetic materials, the magnetic system 12 is kept balanced by utilizing a lever principle, the magnetic system 12 is prevented from deflecting to the side and cannot rotate back and forth, and meanwhile, the balance piece 13 and the balance piece 14 are influenced by the magnetic field of the magnetic system 12, so that the non-magnetic materials are adopted;
Referring to fig. 7 and 9, the inner wall of the roller 3 is fixedly connected with a plurality of magnetic driving strips 15 distributed around the inner wall of the roller 3 at equal intervals, the distance between the outermost end of the magnetic driving strip 12 and the inner wall of the roller 3 is larger than the width of the magnetic driving strip 15, and the distance between the outermost end of the weight 14 and the inner wall of the roller 3 is smaller than the width of the magnetic driving strip 15, so that the magnetic driving strip 15 does not collide with the magnetic driving strip 12 when passing through the magnetic driving strip 12, and the magnetic driving strip 15 can rotate by colliding the magnetic driving strip 15 when passing through the weight 14, so that the magnetic field distributed on the roller 3 is changed, thereby effectively avoiding the formation of large magnetic agglomeration, the magnetic driving strip 15 comprises a wear-resistant outer wrapping film 1501, and the inside of the wear-resistant outer wrapping film 1501 is filled with a silica gel filling pad 1502, and the weight 14 does not hinder the normal rotation of the roller 3 and does not generate vibration and noise, so that the magnetic driving strip 15 adopts a wear-resistant outer wrapping film 1501 and an elastic silica gel filling pad 1502;
Referring to fig. 6 and 8, the machine case 1 is fixedly connected with a limited rotator 16, one end of a magnetic supporting shaft 10 far away from a driving motor 6 penetrates through a roller 3, a hollow rotating shaft 5 and a side wall of the machine case 1 and extends into the limited rotator 16, a rotating groove 1601 matched with the magnetic supporting shaft 10 is formed in the middle side wall of the limited rotator 16, the magnetic supporting shaft 10 is rotationally connected with the inner wall of the rotating groove 1601, rotation limiting grooves communicated with the rotating groove 1601 are formed in the two side walls of the limited rotator 16, two rebound pieces 17 which are symmetrically distributed are mounted on the inner wall of the rotation limiting groove, the rebound pieces 17 comprise flexible elastic arc-shaped films 1701, rubber nets 1702 are fixedly connected to the inner wall of the flexible elastic arc-shaped films 1701, when the magnetic system 12 rotates, the magnetic supporting shaft 10 drives a positioning plate 18 to squeeze the rebound pieces 17, and the positioning plate 18 is rebounded by the elasticity of the flexible elastic arc-shaped films 1701 and the rubber nets 1702, the magnetic system 12 can be reset, so that the frequency of the magnetic system 12 rotating back and forth is effectively accelerated, the purification effect of the iron concentrate is effectively improved, the side walls of the two sides of the magnetic system supporting shaft 10 are fixedly connected with the positioning plates 18, the upper side and the lower side of the positioning plates 18 are respectively contacted with the two rebound pieces 17, the iron concentrate in the mineral powder is magnetically absorbed by the roller 3, the magnetic system driving strip 15 continuously collides with the counterweight piece 14 under the driving of the roller 3, the counterweight piece 14 drives the magnetic system 12 to rotate back and forth to change the magnetic field distributed on the roller 3, thereby effectively avoiding the formation of large magnetic aggregation, effectively separating the iron concentrate from carried impurities, effectively improving the purity of the iron concentrate, in addition, the rebound pieces 17 can limit the rotating range of the magnetic system 12, and the rebound pieces 17 effectively accelerate the frequency of the magnetic system 12 rotating back and forth by virtue of the elasticity of the rebound pieces themselves, thereby further effectively improving the purification effect.
Example 2 based on example 1, please refer to fig. 1, the dry grinding and dry separation process of ultra-lean magnetite comprises the following steps:
50 kg of ultra-lean magnetite ore is taken, the grade of the magnetite ore is TFe10.92%, the magnetic iron grade MFe is 5.2 percent, the granularity of the raw ore is less than or equal to 20mm.
N1, coarse crushing, medium crushing and fine crushing of raw iron ore until the granularity is smaller than 14mm, preselecting the raw iron ore by using a multi-gradient dry magnetic separator with magnetic field strength of 1700Gs-5400 Gs and rotating speed of 62r/min to obtain primary refined ore, wherein the grade TFe21%, the magnetic iron grade MFe12.52%, the yield of 29.96%, the iron content of the discarded waste material of TFe6.99%, the magnetic iron grade MFe0.69% and the yield of 70.04%.
N2, grinding the primary concentrate by a high-pressure roller mill, carrying out closed-circuit screening to obtain mineral aggregate with granularity smaller than 5mm, carrying out secondary preselection by using a multi-gradient dry magnetic separator with magnetic field strength of 1700Gs-5700 Gs at a rotating speed of 66r/min to obtain the preselected concentrate, wherein the grade TFe is 35.77%, the magnetic iron grade MFe is 28.08%, the yield is 46.17%, the iron content of the discarded waste is 6.33%, the magnetic iron grade MFe is 0.39%, and the yield is 53.83%.
N3, grinding the pre-selected refined ore into mineral powder by a vertical mill, wherein the mineral powder has the granularity of less than 0.074mm and the proportion of 78%, selecting the mineral powder by a multi-gradient micro powder dry magnetic separator with the magnetic field strength of 1500 Gs-3000 Gs at the rotating speed of 87r/min to obtain primary iron refined powder, wherein the grade TFe is 59.38%, the yield is 55.67%, the iron content of the discarded waste is 6.13% of the grade TFe, the magnetic iron grade MFe is 0.35%, the yield is 44.33%, and the gangue powder content of the primary iron refined powder is 9.5% measured by a laboratory.
And N4, purifying the obtained primary iron concentrate by using a dry swinging iron concentrate purifier with the magnetic field strength of 2000Gs to obtain the iron concentrate with the grade TFe of 65.61%, wherein the yield is 89.6%, and the recovery rate is 92.4%.
Example 3 referring to fig. 2, based on example 1, the dry grinding and dry separation process of low grade magnetite includes the following steps:
40 kg of low-grade magnetite ore, the grade of the magnetite ore TFe27.45%, the grade of the magnetite ore MFe22.12% and the granularity of the raw ore less than or equal to 40mm are taken.
M1, coarse crushing, medium crushing and fine crushing of raw iron ore until the granularity is smaller than 10mm, preselecting the raw iron ore by using a multi-gradient dry magnetic separator with magnetic field strength of 1700Gs-5400 Gs and rotating speed of 52r/min to obtain preselected refined ore, wherein the grade TFe31.89%, the magnetic iron grade MFe24.36%, the yield of 82.8% and the iron content of the throw-off waste are 6.08%, the magnetic iron grade MFe0.40% and the yield of 17.2%.
M2, grinding the pre-selected refined ore into mineral powder by a vertical mill, wherein the proportion of the mineral powder particles is 49% with the magnetic field strength of 1500 Gs-3000 Gs, selecting the mineral powder by a multi-gradient micro powder dry magnetic separator with the magnetic field strength of 1500 Gs/min at the rotating speed of 87r/min to obtain primary iron refined powder, wherein the grade TFe is 62.78%, the yield is 45.96%, the iron content of the discarded waste is 5.62%, the magnetic iron grade MFe is 0.30%, the yield is 54.04%, and the gangue powder content of the primary iron refined powder is 5% measured by a laboratory.
And M3, purifying the obtained primary iron concentrate by using a dry swinging iron concentrate purifier with the magnetic field strength of 2000G to obtain the iron concentrate with the grade TFe of 66.18%, wherein the yield is 94.6%, and the recovery rate is 90.48%.
The foregoing is merely illustrative of the best modes of carrying out the invention in connection with the actual requirements, and the scope of the invention is not limited thereto.
Claims (5)
1. The magnetite dry-grinding dry-separation processing technology is characterized by comprising the following steps of:
s1, performing three-section closed circuit crushing of coarse crushing, medium crushing and fine crushing on raw iron ore, repeatedly screening and crushing to obtain mineral aggregate with granularity smaller than 14mm, and pre-selecting by using a multi-gradient dry magnetic separator to obtain primary concentrate, wherein the discarded mineral aggregate is used for building sand aggregates;
S2, feeding the primary concentrate into a high-pressure roller mill for grinding, sieving by using 5mm sieve holes, returning mineral materials with the size larger than 5mm back to the high-pressure roller mill for grinding, preselecting the mineral materials with the size smaller than 5mm by using a multi-gradient dry magnetic separator to obtain preselect concentrate, and using the discarded mineral materials as tailings for comprehensive utilization;
S3, putting the pre-selected refined ore into a vertical mill for grinding, and selecting by using a multi-gradient micro powder dry magnetic separator to obtain primary iron refined powder, wherein the discarded ore is also used as tailings for comprehensive utilization;
S4, the primary iron concentrate is put into a dry swing iron concentrate purifier for purification, so as to obtain the final target iron concentrate, and the residual trace mud is used as tailings for comprehensive utilization;
The dry-type swinging fine iron powder purifying machine in the S4 step comprises a machine case (1), the upper end of the machine case (1) is connected with a feed hopper (2), a roller (3) is fixedly arranged in the middle of the machine case (1), mounting seats (4) are fixedly connected to the inner walls of two sides of the machine case (1), hollow rotating shafts (5) matched with the mounting seats (4) are fixedly connected to the two ends of the roller (3), a driving motor (6) is arranged on the outer wall of one side of the machine case (1), the output end of the driving motor (6) is connected with one of the hollow rotating shafts (5), an iron powder blanking port (101) is formed in the bottom of the machine case (1), one side, close to the roller (3), of the iron powder blanking port (101) is fixedly connected with a distributor (7), a material throwing port is formed in the side wall of the machine case (1), a guide plate (8) fixedly connected with the distributor (7) is placed at the material throwing port, a flushing water pipe (9) is fixedly connected to the position of the symmetric position of the iron powder blanking port (101) with the distributor (7), a magnetic sleeve (11) is fixedly connected to the inner supporting shaft (10), a magnetic sleeve (11) is fixedly connected to the side wall of the magnetic sleeve (11), and mounting cylinder (11) just is to lateral wall fixedly connected with balancing piece (13) of magnetic system (12), one end fixedly connected with counter weight (14) of magnetic system (12) are kept away from to balancing piece (13), the inner wall fixedly connected with of roller (3) a plurality of equidistant magnetic system drive bars (15) that encircle the distribution, fixed connection limited rotor (16) of machine case (1), and the one end that driving motor (6) was kept away from to magnetic system back shaft (10) run through roller (3), hollow pivot (5) and the lateral wall of machine case (1) and extend to in limited rotor (16), change the middle part lateral wall of ware (16) and set up rotary groove (1601) that matches with magnetic system back shaft (10), and the inner wall rotation of magnetic system back shaft (10) and rotary groove (1601) is connected, the rotatory limiting groove's of both sides lateral wall of limit rotor (16) all set up with the rotatory limiting groove, and the inner wall of rotatory limiting groove installs two rebound pieces (17) of symmetrical distribution, the lateral wall of magnetic system back shaft (10) is connected with two locating plates (18) on both sides of the fixed connection respectively with two lower locating plates (18).
2. The magnetite dry grinding and dry separation processing technology according to claim 1 is characterized in that the installation cylinder (11), the magnetic system (12), the balance piece (13) and the balance piece (14) are mainly positioned on the axis of the magnetic system support shaft (10), and the balance piece (13) and the balance piece (14) are made of non-magnetic materials.
3. A magnetite dry grinding and dry separation process according to claim 1, wherein the distance between the outermost end of the magnetic system (12) and the inner wall of the drum (3) is larger than the width of the magnetic system driving bar (15), and the distance between the outermost end of the weight (14) and the inner wall of the drum (3) is smaller than the width of the magnetic system driving bar (15).
4. The magnetite dry grinding and dry separation processing process according to claim 1, wherein the magnetic drive bar (15) comprises a wear-resistant outer wrapping film (1501), and the inside of the wear-resistant outer wrapping film (1501) is filled with a silica gel filling pad (1502).
5. The magnetite dry grinding and dry separation processing technology according to claim 1, wherein the rebound member (17) comprises a flexible elastic arc membrane (1701), and a rubber net (1702) is fixedly connected to the inner wall of the flexible elastic arc membrane (1701).
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|---|---|---|---|---|
| CN2745664Y (en) * | 2004-08-11 | 2005-12-14 | 辛为思 | Permanent magnet cylindrical shaking dry screening machine |
| CN101559403A (en) * | 2009-05-31 | 2009-10-21 | 安徽大昌矿业集团有限公司 | Method for concentrating extremely low-grade refractory magnetite |
| CN112264172A (en) * | 2020-09-24 | 2021-01-26 | 酒泉钢铁(集团)有限责任公司 | Process for producing iron ore concentrate by grading, dry grinding and dry separation of low-grade magnetite |
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| US20140262968A1 (en) * | 2013-03-15 | 2014-09-18 | Fritz Enterprises, Inc. | System and method for recovery of valuable constituents from steel-making slag fines |
| CN105772218B (en) * | 2016-03-22 | 2018-10-30 | 薛鹏飞 | A kind of iron ore circulation classification beneficiation method and the dry-dressing machine applied to this method |
| AU2020104144A4 (en) * | 2020-12-17 | 2021-03-04 | Hunan Research Institute For Nonferrous Metals | Purification method of superfine graphite ore |
| CN215586661U (en) * | 2021-09-09 | 2022-01-21 | 深圳市酷彼伴玩具有限公司 | Magnetic material ball mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745664Y (en) * | 2004-08-11 | 2005-12-14 | 辛为思 | Permanent magnet cylindrical shaking dry screening machine |
| CN101559403A (en) * | 2009-05-31 | 2009-10-21 | 安徽大昌矿业集团有限公司 | Method for concentrating extremely low-grade refractory magnetite |
| CN112264172A (en) * | 2020-09-24 | 2021-01-26 | 酒泉钢铁(集团)有限责任公司 | Process for producing iron ore concentrate by grading, dry grinding and dry separation of low-grade magnetite |
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