CN1222343C - Magnetic filter device - Google Patents

Magnetic filter device Download PDF

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Publication number
CN1222343C
CN1222343C CNB018026168A CN01802616A CN1222343C CN 1222343 C CN1222343 C CN 1222343C CN B018026168 A CNB018026168 A CN B018026168A CN 01802616 A CN01802616 A CN 01802616A CN 1222343 C CN1222343 C CN 1222343C
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CN
China
Prior art keywords
filter
fluid
magnetic
iron powder
filter device
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Expired - Lifetime
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CNB018026168A
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Chinese (zh)
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CN1388765A (en
Inventor
饭田祐弘
中川健次
上野直人
加藤克彦
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JFE Steel Corp
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JFE Steel Corp
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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
    • 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
    • B03C1/28—Magnetic plugs and dipsticks
    • B03C1/288—Magnetic plugs and dipsticks disposed at the outer circumference of a recipient
    • 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
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0332—Component parts; Auxiliary operations characterised by the magnetic circuit using permanent magnets

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  • Filtering Materials (AREA)
  • Filtration Of Liquid (AREA)

Abstract

A magnetic filter device, comprising permanent magnets installed opposedly to each other on both sides of a container so that magnetic lines of force are generated in the direction orthogonal to the moving direction of the fluid in the container, wherein the relation between the installation interval (L) for the filter device and the residual induction (B) of the permanent magnets meets the requirement of the expression B x 100 <= L <= B x 250 under the condition that the filter passing time of the fluid is 0.5 sec. to 1.5 sec. or shorter, whereby, when the general-purpose permanent magnets such as ferrite magnets and neodymium magnets are used, the device can be reduced in size at a low cost by deriving the maximum filter performance.

Description

Magnetic filter device
Technical field
The present invention relates to a kind of magnetic filter device, be in rolling purified treatment of to cold-rolling of steel plate the time, using, be used for the magnetic filter device that continuous separation is mixed in the magnetic particle of this fluid with oil, the various fluids such as cleaning fluid will should be rolling after cold rolling removed with oil.
Technical background
That uses during to cold-rolling of steel plate rollingly purifies, when the rolling cleaning fluid with oil that is used to remove the surface of steel plate that remains in after cold rolling is purified, adopts the magnetic filter device conduct to remove the equipment of the magnetic particle in the fluid with oil.
To an example of traditional representative magnetic filter device, describe with the sectional drawing of Fig. 1 (a) and with the side view of (b) among the figure.Among the figure, sequence number 1 expression container, 2 expression permanent magnets, 3 expression filter bodies, 4 expression backplates, 5 expression fluid introducing ports, 6 expression fluid discharge outlets.
Normally the ferromagnetism body that constitutes such as woven wire that will be stainless steel by ferrites such as steel or SUS 430 is arranged in the container 1 as magnetic filter body 3.And, in the outside of this container 1, permanent magnet 2 is set in opposite directions across container 1, make the direction and flow direction approximate vertical of the magnetic line of force of generation as the fluid of processed liquid.Processed liquid imports in the container 1 from the introducing port 5 of fluid, passes magnetic filter body 3 backs and discharges from outlet 6.The magnetic particles such as iron powder that are mixed in the processed liquid are subjected to being separated from processed liquid by the magnetic absorption of the magnetic filter body 3 after permanent magnet 2 magnetization in the process of passing magnetic filter body 3.
In the seizure of the magnetic particle that utilizes such magnetic filter device to carry out is handled, can express with following formula from the fine rule that constitutes filter body or the suction Fm of woven wire:
Fm＝χ·V·H·(dH/dx)
At this, χ: the magnetic susceptibility of particle;
V: the volume of particle;
H: magnetic field intensity;
DH/dx: magnetic gradient (spatial variations in magnetic field).
In following formula, because χ and V are the characterisitic parameters of magnetic particle, thus in order to increase suction Fm, to improve filter capability, must increase magnetic field H, or increase magnetic gradient dH/dx.But, magnetic gradient dH/dx is the material parameter relevant with shape with the ferromagnetism body that constitutes filter body, again because this magnetic gradient dH/dx, except that material that is decided by the ferromagnetism body and shape, also be subjected to the influence of magnetic field intensity, so, how keeping the high-intensity magnetic field in the filter, is the most important problem that improves filter capability, that is to say raising suction.
Past, because the relation in this filter capability and magnetic field is not studied fully, so the magnetic field that often takes place in the filter reduces and the unfavorable condition of filter capability deterioration.And,, can not determine to adopt the strong magnets of what degree just can obtain required filter capability for selecting of magnet.Because the flow rate of fluid of the shape of filter and processing etc. are indeterminate with the relation of the intensity of magnet, so, cause obtaining desirable filter capability.
That is, even used powerful magnet, because the relation of design, specification, differing obtains good effect surely.
And, if adopt powerful magnet, although can expect to obtain appropriate effect, but the inevitable shortcoming that exists cost to rise.
Summary of the invention
The present invention, help addressing the above problem, purpose is to provide a kind of magnetic filter device, be to adopt ferrite lattice or this class of neodium magnet to have under the situation of permanent magnet of extensive use, by having given play to maximum filter capability, under prerequisite cheaply, make the magnetic filter device of equipment miniaturization.
Inventors, purpose is the intensity in the magnetic field on the clear and definite magnetic filter device and the relation of filter capability, though investigation was carried out in the influence to the various factors that relates to filter capability, but it is current, the successfully clear and definite influence of various factors to filter capability, and developed cheap in view of the above and magnetic filter device efficiently.
Promptly, magnetic filter device of the present invention, be in the container of introducing port with fluid and outlet, the filter body that setting is made of the ferromagnetism body, and the magnetized permanent magnet of this filter body will be provided with in opposite directions across container, make the direction and the interior fluid moving direction approximate vertical of container of the magnetic line of force of generation, it is characterized in that: on this magnetic filter device, the filter that limits fluid by the time more than 0.5 second, 1.5 second with under the interior prerequisite, above-mentioned permanent magnet is set makes relation between its remanence B (T) that L (mm) and permanent magnet at interval are set satisfy the condition of following formula:
B×100≤L≤B×250
In the present invention, as making the magnetized permanent magnet of filter body, preferably adopt the material of remanence more than 0.4T.
The simple declaration of drawing
Shown in Figure 1 is an example of traditional representative magnetic filter device, (a) is that sectional drawing, (b) are side view.
Fig. 2 shows the coordinate diagram of apart from L (mm) iron powder being removed the influence of rate η between the remanence B (T) of permanent magnet and magnet.
Fig. 3 shows distance and the ratio (L/B) of remanence and the coordinate diagram of the relation of installation cost between magnet.
Fig. 4 show to obtain good iron powder to remove between the remanence B of permanent magnet of rate and magnet coordinate diagram apart from the relation of L.
Fig. 5 is the per 1 group filter capability (iron powder is removed rate η) and the coordinate diagram of the relation of filter apparatus expense.
Shown in Figure 6 is filter length A and filter inner fluid speed v.
Fig. 7 is filter is removed the relation of rate η by time t and iron powder a coordinate diagram.
Fig. 8 is the coordinate diagram that filter passes through the relation of time t and filter apparatus expense.
Fig. 9 is the ideograph that is provided with the cleaning equipment of magnetic filter device of the present invention.
The optimised form that carries out an invention
Below, the present invention is carried out specific description.
At first, detailed process of the present invention is described.
And considered following content as the factors relevant with filter capability:
Magnet strength
Distance between magnet
The material of filter body and shape
Fluid velocity
The length of filter body
The character of fluid
At this, in experiment to the factors relevant with filter capability, as filter body, be that the ferrite that is full of the most frequent use in container is woven wire (10 orders, the wire harness: φ 10mm) of stainless steel SUS 430 systems, and, adopted the alkaline cleaning fluid that generally uses in the cleaning treatment of cold-rolled steel sheet as fluid.This alkaline cleaning fluid normally is repeated to use, and what use is that mass component by the approaching side iron powder concentration before the filter is roughly the cleaning fluid of 60ppm to 100ppm.
In addition, for filter capability, estimate with following formula:
Iron powder is removed rate η=(F-E)/F * 100 (%)
At this, F: approaching side iron powder concentration;
E: discharge side iron powder concentration;
At this,, can say that then filter capability is good if iron powder is removed rate η more than 60%.Otherwise iron powder is removed rate η less than 60%, and is then such as hereinafter described, in order to ensure the degree of purification of fluid, must increase circular flow, and the result causes filter apparatus to increase, so be not good plan.
In addition, when confirming filter capability, iron powder is removed the mensuration of rate η, is after backwash (backwashing) filter, through 10 to 20 minutes, and when carrying out stable filtration, sampling determination.
Again, for permanent magnet, employing be that the size of remanence B is roughly at commonly used ferrite lattice or the neodium magnet of 0.2T to 0.6T.
In addition, between the magnet of the permanent magnet shown in Fig. 1 (a) apart from L, be to be regarded as, therefore, make between this magnet apart from L and measured iron powder and remove rate η to changing between 200mm at 35mm on magnetic filter device, obtaining the desired very important value of performance.
Figure 2 shows that apart from L (mm) iron powder being removed the investigation result of the influence of rate η between the remanence B (T) of the permanent magnet that uses and magnet.In addition, the filter with fluid was made as 1.0 seconds by the time.
As indicated in this figure, when satisfying concerning of following formula apart from L (mm) between remanence B of permanent magnet (T) and magnet:
L≤250×B
Show to stablize and obtain the high-pass filter performance.
Secondly, also investigate having reduced between magnet situation apart from L, show as L during less than B * 100, though removing rate η, iron powder can keep stable high value, because the filter basal area becomes too little, so must design a plurality of filter set in order to ensure circular flow, it is complicated that the result is that equipment becomes, maintenance is trouble also, in addition, also causes the remarkable increase of installation cost.
Figure 3 shows that on the alkaline cleaning equipment of the steel plate behind reality rolling that the amount of establishing the cleaning fluid that cleans steel plate is about 20m 3, circular flow is 0.2m 3/ minute, the investigation result of the installation cost of the filter when being different value to changing L/B.In addition, in figure, the installation cost when establishing L/B=150 is 1.0, thereby installation cost has been carried out relatively.
Indicated as figure, when L/B reduces, remove performance, but, must increase the group number of filter in order to ensure circular flow even improved the iron powder of filter, installation cost is risen.Particularly when L/B less than 100 the time, installation cost sharply increases.
Therefore, in the present invention, as shown in Figure 4, satisfy the relation of following formula between the remanence B of design permanent magnet and magnet apart from L:
100×B≤L≤250×B
In addition, in above-mentioned experiment, be roughly 60ppm to 100ppm though establish fluid at the mass component of the iron powder concentration of filter approaching side, but because filter is constant recycling usually, so, for the degree of purification of the fluid that circulates, many targets with iron powder concentration fix on below the mass component 30ppm.
Shown in Figure 5, be on the alkaline cleaning equipment of the steel plate behind reality rolling, be about 20m in the amount of the cleaning fluid that cleans steel plate 3, the filter approaching side the mass component of average iron powder concentration be roughly on the stream of alkaline cleaning fluid of 150ppm, being provided with circular flow is 0.2m 3/ minute filter, to the investigation result of the relation between the installation cost of per 1 group filter capability (iron powder is removed rate η) under the situation that is about 20ppm in the iron powder concentration that keeps alkaline cleaning fluid and filter.
In addition, in figure, establishing iron powder, to remove the installation cost of rate η=70% o'clock be 1.0, thereby installation cost is carried out relatively.
Shown in figure, large-scale for keeping cleaning fluid to reach the necessary filter of degree of purification of setting when the iron powder of per 1 group filter is removed rate η less than 60% the time, cause installation cost to increase.Therefore, the iron powder of filter being removed rate η be located at more than 60%, also is good plan from the device efficiency aspect.
Then, investigate to the flow of the treatment fluid by filter, flow velocity and by the time.Carrying out iron powder and remove the mensuration of rate η, is to change between second to 300mm/ second and filter is made as by length under 4 kinds of patterns of 50mm, 100mm, 150mm, 200mm at 100mm/ at the flow velocity that makes treatment fluid to carry out.In Fig. 6, be depicted as filter length A and filter inner fluid speed v, but at this, filter by time t can with under show expression:
t＝A/v
T: fluid is by the time (second) of filter;
A: filter length (mm);
V: filter inner fluid speed (mm/ second).
Investigation according to above-mentioned shows filter capability, and promptly iron powder is removed rate η and can be put in order according to the time of passing through of filter.
Figure 7 shows that the arrangement of investigation result of filter being removed the relation of rate η by time t and iron powder.
Shown in figure, show situation whatsoever, filter by time t during less than 0.5 second iron powder remove rate η and sharply descend, filter capability significantly reduces.In addition, when filter surpasses 1.5 seconds by time t, do not think that iron powder removes rate η and can increase substantially yet.
Then, on the alkaline cleaning equipment of the steel plate behind reality rolling, be about 20m in the amount of the cleaning fluid that cleans steel plate 3, the filter approaching side the mass component of average iron powder concentration be roughly on the stream of alkaline cleaning fluid of 150ppm, it is 0.2m that circular flow is set 3/ minute, when being 1.0 seconds by the time iron powder to remove rate η be 70% filter, the filter under the situation that is about 20ppm in the iron powder concentration that keeps alkaline cleaning fluid is investigated with the relation that filter apparatus takes by time t, investigation result is shown in Fig. 8.In addition, in figure, filter is made as 1.0 by the installation cost of time t=1.0 during second, thereby installation cost has been carried out relatively.
Shown in figure, show when filter surpasses 1.5 seconds by time t, though the remanence at permanent magnet reduces a little, and between magnet under bigger a little the situation of distance, can guarantee that also necessary iron powder removes rate, but for the needed filter result of the degree of purification that keeps cleaning fluid is to become large-scale, so installation cost increases.Therefore, filter being located in 1.5 seconds by time t, also is good plan from the angle of device efficiency.
From above-mentioned Fig. 7 and result shown in Figure 8, show that the effective filter of having considered filter capability and installation cost is between 0.5 second to 1.5 seconds by time t.
Therefore, in the present invention, with the filter of fluid by time t be limited in more than 0.5 second, in 1.5 seconds.
Embodiment
On the cleaning equipment of reality shown in Figure 9, adopted magnetic filter device of the present invention to carry out the purified treatment of cleaning fluid.
In with figure, the steel plate 7 after rolling after by the thick tank-washer 8 that is called tank (ダ Application Network Application Network) usually, is scrubbed in the 1st scrubbing unit 9, is finally cleaned in washer box 10 then.
Circulating box 11,12 is set respectively on tank 8 and washer box 10, utilizes pump 13,14 to be recycled based on the cleaning fluid of alkaline cleaning fluid.
Circulating box 11 or 12 cleaning fluid import magnetic filter device 15,16 of the present invention by pump 17,18, and the iron powder absorption of removing from steel plate in the cleaning process is removed.
At this, the circulating box of washer box is shown in table 1 with the specification of magnetic filter device 16, the filter of cleaning fluid by time and approaching side iron powder concentration.
And, in table 1, also record the investigation result that the discharge side iron powder concentration and the iron powder of the cleaning fluid after the purified treatment of carrying out cleaning fluid are under these conditions removed rate η.
Shown in table, when adopting magnetic filter device of the present invention to handle, iron powder is removed rate η always more than 60%, can obtain good result.
And, also to investigate with the situation that magnetic filter device 15 adopts magnetic filter device of the present invention to carry out purified treatment for the circulating box of tank, affirmation can obtain good result.
The effect of invention
If employing the present invention when the permanent magnet that has an extensive use in employing carries out the purified treatment of fluid, can bring into play maximum filter capability, its result, the miniaturization that can low-cost reach device.
And, traditionally in the continuous annealing process after cleaning, the remaining iron powder of surface of steel plate is attached to rolling on the rod surface in the stove, and often generation is called the concavo-convex defective of rolling the rod impression, like this, yield rate is forced to descend about 0.2～0.5%, but,, can make iron powder by strong and stably remove by magnetic filter device of the present invention is applied on the carrying out washing treatment, its result is successfully to have stopped this defective.
Table 1
No. The remanence of permanent magnet (T) Between magnet apart from L (mm) Filter length A (mm) Filter is by time t (second) Cleaning fluid approaching side iron powder concentration (mass component ppm) Cleaning fluid is discharged side iron powder concentration (mass component ppm) Iron powder is removed rate η (%)
1 0.6 150 200 1.5 80 20 75
2 0.6 150 100 1.0 70 22 69
3 0.6 150 50 0.5 76 30 61
4 0.6 90 200 1.5 74 11 85
5 0.6 90 100 1.0 68 15 78
6 0.6 90 50 0.5 91 27 70
7 0.4 90 150 1.5 95 23 76
8 0.4 90 150 1.0 66 20 70
9 0.4 90 150 0.5 73 27 63
10 0.4 50 150 1.5 87 12 86
11 0.4 50 150 1.0 88 16 82
12 0.4 50 150 0.5 76 19 75

Claims (1)

1. magnetic filter device, be in the container of introducing port with fluid and outlet, the filter body that setting is made of the ferromagnetism body, and the magnetized permanent magnet of this filter body will be provided with in opposite directions across container, make the magnetic filter device of the direction of the magnetic line of force and the direction approximate vertical that the fluid in the container moves of generation
It is characterized in that: the filter that limits fluid by the time more than 0.5 second, 1.5 seconds with interior prerequisite under, above-mentioned permanent magnet is set makes relation between its remanence B (T) that L (mm) and permanent magnet at interval are set satisfy the condition of following formula:
B×100≤L≤B×250。
CNB018026168A 2000-09-05 2001-09-04 Magnetic filter device Expired - Lifetime CN1222343C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP268303/2000 2000-09-05
JP268303/00 2000-09-05
JP2000268303A JP2002079011A (en) 2000-09-05 2000-09-05 Magnetic filter apparatus

Publications (2)

Publication Number Publication Date
CN1388765A CN1388765A (en) 2003-01-01
CN1222343C true CN1222343C (en) 2005-10-12

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KR (1) KR100697502B1 (en)
CN (1) CN1222343C (en)
TW (1) TW494004B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100450628C (en) * 2005-02-05 2009-01-14 李泽 Ceramic sizing material iron removing method and device
US8066877B2 (en) * 2005-02-17 2011-11-29 E. I. Du Pont De Nemours And Company Apparatus for magnetic field and magnetic gradient enhanced filtration
US7615151B2 (en) * 2007-01-25 2009-11-10 Cummins Filtration Ip Inc. Filter with installation integrity and magnetic flow-control
KR101179780B1 (en) * 2010-08-31 2012-09-04 한국수력원자력 주식회사 Apparatus and Process for removing iron particles in water solution

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* Cited by examiner, † Cited by third party
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JPH06323707A (en) * 1993-05-13 1994-11-25 Mitsui Constr Co Ltd Artificial snow spray apparatus
JP2728848B2 (en) * 1993-09-01 1998-03-18 川崎製鉄株式会社 Magnetic filter

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KR100697502B1 (en) 2007-03-20
KR20020044183A (en) 2002-06-14
CN1388765A (en) 2003-01-01
TW494004B (en) 2002-07-11
JP2002079011A (en) 2002-03-19

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