CN86100458B - Demagnetization device for pm - Google Patents
Demagnetization device for pm Download PDFInfo
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- CN86100458B CN86100458B CN86100458A CN86100458A CN86100458B CN 86100458 B CN86100458 B CN 86100458B CN 86100458 A CN86100458 A CN 86100458A CN 86100458 A CN86100458 A CN 86100458A CN 86100458 B CN86100458 B CN 86100458B
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- magnetic
- permanent magnetism
- magnetism
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Abstract
The present invention relates to a PM demagnetizing device and a device for magnetic powder material, which has the technical scheme that a magnetic system is composed of a PM magnet and a magnetism conducting plate; the magnetic system makes a rotary motion to form an alternating magnetic field under the function of mechanical force, and the magnetic powder material passing through the magnetic field is demagnetized; the magnetic flux density, the frequency and the demagnetizing rate of the magnetic field all can be regulated in the broad range; the magnetic line direction of the alternating magnetic field is vertical to material flowing direction of the magnetic powder material. The present invention has the advantage that the demagnetizing efficiency (eta) is 5 to 30% higher than that of an industrial frequency magnetic demagnetizer, and is suitable for demagnetize the residual magnetism of the magnetic powder material having different magnetic performance; the present invention is convenient for further processing.
Description
The invention belongs to a kind of magnetic powder-material, particularly the permanent magnetism about the magnetic concentrate powder takes off magnetism method and device.
As everyone knows, the magnetic separation of ferromagnetism ferriferous oxide is the magnetic contrast that utilizes mineral, adopts all kinds of magnetic plants to carry out sorting.The concentrate product has just formed " magnetic coagulation " after being magnetized in the magnetic separation production process, this is for the grind grading filtering means dehydration and selectedly once more all produce very important adverse effect.Particularly in recent years, because stage grinding and stage separation selects at iron ore and obtained application more and more widely in the factory, make use take off magnetic machine and become critical industrial link by less important work.
" magnetic coagulation " phenomenon is also brought many troubles and must be taken off magnetic in the processing of other magnetic powder-material.
The method of the elimination of Shi Yonging always " magnetic coagulation " has: the Curie point that the temperature of magnetic powder-material is heated to it; Adopt extremely strong mechanical oscillation; Make the radiation treatment of high dose; " tissue is aging " for a long time; Apply external magnetic field interference etc.But, only apply external magnetic field and disturb this a kind of method comparatively suitable for the magnetic treatment of taking off of typical products in mass production.
Up to the present, generally the electromagnetism of Shi Yonging takes off magnetic method, and the electromagnetism that has proposed various types of fine grinding powders as Russian Patent SU-459257, SU-650652, SU-755310 etc. takes off magnetic method.
No matter which kind of electromagnetism takes off magnetic method, all exist the equipment complexity, power consumption is big, and water consumption is many, cost height, problems such as Operation and Maintenance difficulty.When particularly taking off magnetic for the magnetite concentrate powder of artificial roasting, because this material coercive force is bigger, making that to take off magnetic efficiency very low, generally only is about 60%.Its reason is that the magnetic flux density of electromagnetism demagnetizer is lower, only is Bi=40～50mT generally, and the frequency of demagnetizer is lower, is generally f=50～60H
z, this just can't remove the remanent magnetism of the higher roasting magnetite concentrate powder of coercive force fully.
Therefore people turn to the permanent magnetism demagnetization device.
Russian Patent SU-549841 has proposed a kind of demagnetizer based on permanent magnetic plate, and permanent magnetic plate causes high-frequency alternating magnetic field in the space, and permanent-magnet pole is then magnetized by segmentation, and the direction of magnetization of each section is opposite with adjacent segment, and all direction of magnetizations are all perpendicular to magnetic conductive board.But this permanent magnetism demagnetizer is only applicable to tape and takes off magnetic.
Russian Patent SU-1065898 has proposed a kind of permanent magnetism demagnetization device, this device is equipped with the magnetic material ring, the sleeve pipe of being pulsed the power supply of control and being made by nonmagnetic substance is as moving the mechanism that waits to take off the magnetic workpiece, this permanent magnetism demagnetizer is only applicable to the magnetic that takes off of magnetic work, and is not suitable for the magnetic that takes off of magnetic powder-material.
Day disclosure is speciallyyed permit clear 58-175810 and has been proposed a kind of permanent magnetism demagnetizer (seeing accompanying drawing 4), the even number permanent magnet that will change from big to small by magnetic flux density in guiding the guiding position of being taken off the magnetic object is lined up, the pole orientation of two adjacent permanent magnets is opposite, quilt is taken off the magnetic object and demagnetizer is done relative motion, reaches the purpose of taking off magnetic by the alternating magnetic field that weakens gradually.Obviously, this demagnetizer is applicable to that also the single-piece magnetic takes off magnetic.
As mentioned above, permanent magnetism demagnetizer in the past all is not suitable for the magnetic breeze is taken off magnetic, because in the ore-dressing technique process, because magnetic powder inventory is big, fine size, and mostly be suspended state, and can not apply an opposing magnetic field and just realize taking off magnetic, magnetic particle can overturn with the variation of external magnetic field in aqueous medium.Therefore when the external magnetic field frequency is low, not only do not reach the purpose of taking off magnetic, tend on the contrary magnetize once more.Therefore must there be a kind of magnetic powdery that can make effectively to take off the method and apparatus of magnetic, takes off magnetic efficiency, and then improve the quality of products and improve technology with raising.
Purpose of the present invention just provides a kind of magnetic powder that can make effectively and takes off the permanent magnetic device of magnetic.
According to the present invention, utilize the magnetic field sources of permanent magnetism magnetic material as demagnetization device, magnetic field sources rotates under the effect of mechanical force and forms the magnetic field of weakening gradually continuously of alternation, the magnetic powder is flowed through, and frequency is enough high, magnetic field intensity is enough big, and the alternating magnetic field that weakens gradually, final magnetic field intensity is zero, thereby reaches the purpose of taking off magnetic.
According to the present invention, the magnetic flux density in magnetic field and frequency can be regulated according to the residual magnetization and the coercive force of the magnetic powder-material of waiting to take off magnetic.The static-magnetic induction in magnetic field can be regulated in 0～240mT scope, and resistance to vibration can be regulated in 0～160mT scope; The frequency of alternating magnetic field can be regulated in 0～400Hz scope.For natural magnetite, Bi＞45.0mT frequency f=50Hz can meet the demands; Bi should be greater than 120mT for the mictomagnet ore deposit, and frequency f should reach 150Hz.
According to the present invention, select high-quality permanent magnetism magnetic material for use, make demagnetizer have higher magnetic flux density, and be orthogonal by the magnetic line of force direction of the made demagnetizer of these magnetic materials and the materials flow direction of magnetic powder.(situation of empty electromagnetism demagnetizer, both are parallel.) waveform of this alternating magnetic field can change, the attenuation rate of alternating magnetic field also can be regulated.
According to the present invention, the permanent magnetism magnetic material can adopt S
rO6Fe
2O
3Al N
1C
O, MMCo
5(mishmetal magnetic material) etc.Can adopt MMCo
5(mishmetal magnetic material), the magnetic property of this permanent magnetic material is as shown in table 1, and the coercive force of this magnetic material is big, so be applicable to half dynamic magnetic circuit.
MMCo
5Magnetic property table 1
After the single magnetic patch of this permanent magnetic material magnetized, the magnetic flux density of utmost point center surface reached 200～220mT, magnetized after falling to closing when two again, and the magnetic flux density that records the pole center surface is 250mT, and 30～50mT is improved in the working point.
When adopting other permanent magnetic material, residual magnetic flux density Br is in 0.38～1.0T scope, and coercivity H is 111.4～358.1 * 10
3In the A/m scope, the long-pending energy of maximum magnetic flux (BH) max is 23.9～87.5 * 10
3J/m
3In the scope, single and fall to closing to magnetize magnetic flux density 0～200 and 0～250mT scope in.
Constitute by magnetic conductive board and permanent magnetic material according to permanent magnetism demagnetization device of the present invention, its magnetic architecture can adopt forms such as axial-flow type, umbrella formula and disc type, magnetic patch forms magnetic body along the magnetic conductive board outer rim by the polarity cross arrangement, number of magnetic poles is an even number, two magnetic body configurations relatively at a certain angle, this adjustable included angle, to change the rate of decay in magnetic field, magnetic body can rotate under the adjustable speed drive unit drives, and the magnetic powder is flowed through by being taken off magnetic behind the conduit in the gap between two magnetic bodies.
Below in conjunction with accompanying drawing the present invention is elaborated.Here be example with disc type permanent magnetism demagnetizer, but the invention is not restricted to disc type.
Accompanying drawing 1 is the front view according to disc type demagnetizer of the present invention.
Accompanying drawing 3 is magnetic survey point distribution maps.
Accompanying drawing 4 is permanent magnetism demagnetizers that day disclosure is speciallyyed permit clear 58-175810.
The magnetic patch of being made by permanent magnetic material 1 is staggered by polarity equably along the outer rim of magnetic conductive board disk 2, number of poles is an even number, two magnetic bodies 4,5 of being made up of magnetic conductive board and magnetic patch dispose so that the α angle is relative, this adjustable included angle, thus can change along the attenuation rate of the magnetic flux density of ore deposit stream flow direction.A magnetic body 4 is contained on the driven shaft 3, and another magnetic body 5 is contained on the driving shaft 6.Driving shaft can adopt adjustable speed motor here by the drive unit 7(of adjustable speed as an example) drive and drive dress magnetic body 5 thereon and rotate and produce magnetic force, previous magnetic body 4 is synchronized with the movement under the drive of this magnetic force.The velocity of rotation of this magnetic system can be according to waiting that the magnetic of taking off the magnetic powder-material determines, makes in the working space between two magnetic bodies arbitrarily the alternating magnetic field of any have to conform with and take off the desired frequency of magnetic.
Because the angle between two magnetic bodies 4,5 is greater than zero, thus from top to bottom increase gradually along the distance of disk circumference angular direction working space, thus make formed magnetic field have the decay characteristics that dies down continuously gradually.Magnetic powder guiding tube 8 is by the working space of demagnetizer, and the magnetic powder enters in the pipe from the guiding tube upper end, is discharged by the pipe lower end after guiding tube 8 is taken off magnetic.
After buncher starts, regulate the frequency f that index reaches expectation, this frequency f can be calculated as follows:
f＝n×p/2×60
In the formula, the f-frequency, Hz,
N-disk (magnetic body) revolution, r/min
The p-number of poles is individual
Accompanying drawing 3 is that the magnetic survey point of magnetic pole distributes, and measuring point 3 is positioned at the pole surface center, and the distance of establishing between two disks is h, then for magnetic material MMCo
3, the relation of intermediate point, utmost point surface induction intensity and distance h is as shown in table 2.
Closed circuit magnetic is the relation table 2 of working clearance and magnetic induction
| Working clearance | h,mm | 16 | 24 | 32 | 40 | 48 |
| Magnetic induction density B (mT) | Intermediate point | 255 | 165 | 105 | 60 | 40 |
| Extremely surperficial | 350 | 330 | 320 | 310 | 300 |
By regulating h value, can be in 0～240mT(static state) and 0～160mT(dynamic) adjusting magnetic flux density in the scope.Along with the variation of h value, the work wave mode of the magnetic induction density B of magnetic system also changes.
This demagnetizer working stability is reliable, simple to operate, water consumption not, few power consumption (only drive unit power consumption), because the magnetic flux density of demagnetizer, frequency, field decay rate etc. all can be regulated in the scope of broad, therefore can be used for removing the remanent magnetism with different coercitive magnetic powder-materials, the work effect is better than various electromagnetism demagnetizers.When handling artificial magnetite concentrate powder, by choosing suitable magnetic parameter Bi, f, the p of taking off, taking off magnetic efficiency η and can improving 25～30% than power frequency electromagnetism demagnetizer of permanent magnetism demagnetizer can improve 7% for natural magnetite (200 orders account for 92%).
After the permanent magnetism demagnetizer takes off magnetic, because " magnetic coagulation " is destroyed, thereby become the dispersed powder, the gangue that is mixed in " magnetic coagulation " is released, and just can improve concentrate grade through magnetic separation again, generally can improve 1.1～1.2%.
Embodiments of the invention:
φ 400 experiment type permanent magnetism demagnetizers, permanent magnetic material adopt mishmetal permanent magnetic material MMCo
3, magnetic system adopts disc.Arrange the magnetic patch of alternating polarity equably at the edge of circular magnetic conductive disk, utmost point center surface magnetic survey point is 1,2,3 ... (see figure 3), the clearance between poles magnetic survey point of two consecutive roots be one, two, three, four ... (not shown).The static-magnetic induction is 0-240mT, and dynamic magnetic induction intensity is 0-160mT, can regulate by transferring h or different putting to powder-material, and frequency can be done to regulate continuously in the 0-400r/min scope by regulating the motor revolution.
This small-sized demagnetizer both can carry out the interruption test of small sample, also can carry out continuity to sample in enormous quantities and take off the magnetic test, and working stability is reliable, and is simple to operate, and adjustable range is wide, especially is suitably used as testing equipment.
Claims (8)
1, a kind of permanent magnetism of magnetic powder-material takes off magnetism method, it is characterized in that the magnetic field sources formed by the permanent magnetism magnetic material, under the effect of mechanical force, rotatablely move and form the magnetic field of weakening gradually continuously of alternation, make magnetic powder-material take off magnetic by this magnetic field, the magnetic flux density in this magnetic field can be in 0～240mT(static state) and 0～160mT(dynamic) regulate in the scope, frequency can be regulated in 0～400Hz scope, the magnetic line of force direction of alternating magnetic field is vertical mutually with magnetic powder-material flow path direction, be applicable to and take off magnetic, the residual magnetic flux density B of permanent magnetism magnetic material having different coercitive magnetic powder-materials
rIn 0.38～1.0T scope, coercive force H
CAt 1400～4500O
eIn the scope, the long-pending energy of maximum magnetic flux (BH)
Max3～11 * 10
6GO
eIn the scope, the magnetic flux density of the utmost point center surface after single magnetic patch magnetizes is 0～220mT, and the magnetic flux density of two utmost point center surfaces that magnetize after falling to closing is 0～250mT.
2, a kind of magnetism method that takes off according to claim 1 is characterized in that the permanent magnetism magnetic material selects S for use
rO6F
E2O
3
3, a kind of magnetism method that takes off according to claim 1 is characterized in that the permanent magnetism magnetic material selects Al N for use
1C
o
4, a kind of magnetism method that takes off according to claim 1 is characterized in that the permanent magnetism magnetic material selects MMCo for use
5(mishmetal permanent magnetic material).
5, a kind of permanent magnetism demagnetization device of magnetic powder-material, it is characterized in that this demagnetization device is made of magnetic conductive board and permanent magnetism magnetic material, its magnetic architecture is that magnetic patch 1 is arranged formation magnetic body 4 and 5 along magnetic conductive board 2 outer rims by alternating polarity, number of magnetic poles is an even number, two magnetic body configurations relatively at a certain angle, this adjustable included angle, magnetic body 4 is contained on the driven shaft 3, magnetic body 5 is contained on the driving shaft 6, driving shaft 6 is driven by the drive unit (for example adjustable speed motor) 7 of adjustable speed, driving initiatively, magnetic body 5 rotates, driven magnetic body then is synchronized with the movement under magnetic force drives, magnetic powder pipe 8 is by the gap between two magnetic bodies, and the magnetic powder is entered by the upper end of pipe 8, discharges from the lower end.
6, a kind of demagnetization device according to claim 5 is characterized in that its magnetic architecture is a disc type.
7, a kind of demagnetization device according to claim 5 is characterized in that its magnetic architecture is an axial-flow type.
8, a kind of demagnetization device according to claim 5 is characterized in that its magnetic architecture is a umbrella.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86100458A CN86100458B (en) | 1986-01-22 | 1986-01-22 | Demagnetization device for pm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86100458A CN86100458B (en) | 1986-01-22 | 1986-01-22 | Demagnetization device for pm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86100458A CN86100458A (en) | 1987-01-31 |
| CN86100458B true CN86100458B (en) | 1988-03-23 |
Family
ID=4801027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86100458A Expired CN86100458B (en) | 1986-01-22 | 1986-01-22 | Demagnetization device for pm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86100458B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383214B (en) * | 2008-07-09 | 2011-04-20 | 黄万田 | Intermediate demagnetizing machine for magnetic selected iron ore powder |
| CN104715881B (en) * | 2015-01-15 | 2016-10-19 | 燕山大学 | A kind of alternating magnetic field generating means |
| CN107424721B (en) * | 2017-09-22 | 2023-08-29 | 上海杰灵磁性器材有限公司 | Pipeline demagnetizing device based on permanent magnet structure and application thereof |
-
1986
- 1986-01-22 CN CN86100458A patent/CN86100458B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN86100458A (en) | 1987-01-31 |
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