CN109650500B - Magnetic field arrangement structure of high-gradient magnetic separator for magnetic coagulation water treatment - Google Patents
Magnetic field arrangement structure of high-gradient magnetic separator for magnetic coagulation water treatment Download PDFInfo
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- CN109650500B CN109650500B CN201910058524.9A CN201910058524A CN109650500B CN 109650500 B CN109650500 B CN 109650500B CN 201910058524 A CN201910058524 A CN 201910058524A CN 109650500 B CN109650500 B CN 109650500B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
Abstract
The invention discloses a magnetic field arrangement structure of a high-gradient magnetic separator for magnetic coagulation water treatment, which comprises the following components: the magnetic separator includes: a plurality of permanent magnet main magnetic poles, permanent magnet auxiliary magnetic poles and arc-shaped iron plates; the plurality of permanent magnetic main poles are arranged on the outer circumferential surface of the arc-shaped iron plate; and are uniformly distributed along the circumferential direction; the permanent magnetic auxiliary magnetic pole is arranged between two adjacent permanent magnetic main poles, two ends of the auxiliary magnetic pole are shorter than the main magnetic pole, and the polarity of one side of the contact surface of the auxiliary magnetic pole and the main magnetic pole is the same as the outward polarity of the main magnetic pole; the magnetic field intensity of the open type magnetic separator is enhanced, and the problems of magnetic flux leakage and magnetic loss in the arrangement of the magnetic field in the traditional magnetic separator are solved. The high gradient magnetic separator made by the invention can be used for treating various industrial sewage and domestic sewage, treating black and odorous river channels, purifying lake and river ground water, precipitating tap water, desalting seawater and pretreating the like.
Description
Technical Field
The invention relates to the technical field of magnetic coagulation water treatment, in particular to a magnetic field arrangement structure of a high-gradient magnetic separator for magnetic coagulation water treatment.
Background
The magnetic coagulation is to add magnetic powder in the conventional coagulation process and to effectively combine the magnetic powder with the coagulated flocs, and because the density of the magnetic powder is high, the density of the coagulated flocs is greatly increased, the settling speed of the flocs is accelerated, and the surface hydraulic load can reach 20-40m 3 /(m 2 H) far higher than 1-2m for conventional coagulation 3 /(m 2 H), simultaneously, the effluent has good water quality which can be compared with the common quartz sand filtration, the suspended solid SS of the effluent is less than 5mg/L, the turbidity is less than 1.0NTU, the total phosphorus TP is less than 0.02mg/L, and the method has excellent dephosphorization effect. The magnetic coagulation process is also characterized by extremely short coagulation and sedimentation time, and the total retention time is less than 20min, so the occupied area is extremely small; the magnetic powder with the density of more than 5g/L is arranged in the system, so the system can endure the flow and the impact of solid load and can still stably run under the condition of high water content or high pollution load. The water inlet of the super-high SS can be received, and the water outlet is not affected.
The magnetic coagulation technology can be widely used for treating various industrial sewage and domestic sewage, treating black and odorous river channels, purifying lake and river ground water, precipitating tap water, desalting seawater and pretreating the seawater and the like. The magnetic coagulation system is also provided with a sludge reflux system, so that magnetic powder and a coagulant in sludge can be recycled, and the consumption of the coagulant can be saved. And magnetic powder in the residual sludge is discharged out of the system after being recovered. Therefore, a key factor for stable and economic operation of the magnetic coagulation system is high recovery rate of magnetic powder, and the recovery of the magnetic powder is realized by a high-gradient magnetic separator.
However, the current magnetic separator for the magnetic coagulation system often cannot meet the requirements, the magnetic induction strength and gradient strength are not enough, the action depth of a magnetic field is shallow, the acting force on magnetic powder is not strong enough, the magnetic powder (the particle size is generally within 20 micrometers) cannot be well recovered by magnetic force under the shearing force action of rapid flowing of sludge, the loss rate of the magnetic powder is high, and the normal operation of the magnetic coagulation system is seriously influenced. In addition, the unreasonable design of the magnetic separator often results in waste of permanent magnet material, resulting in high cost of the magnetic separator. The defects are summarized because the magnetic field arrangement in the magnetic separator is unreasonable, and the magnetic field arrangement cannot well meet the requirement on magnetic powder recovery under the magnetic coagulation working condition. The magnetic field arrangement is a key part of the magnetic separator and plays a decisive role in the performance of the magnetic separator,
based on the technical problems, the application provides a technical scheme for solving the technical problems.
Disclosure of Invention
The invention aims to provide a magnetic field arrangement structure of a high-gradient magnetic separator for magnetic coagulation water treatment, which overcomes the defects of the traditional magnetic field arrangement structure by arranging the magnetic fields of the magnetic separator, not only enhances the magnetic field intensity of an open type magnetic separator, but also avoids the problems of magnetic flux leakage and magnetic loss in the magnetic field arrangement of the traditional magnetic separator.
The technical scheme provided by the invention is as follows:
a magnetic field arrangement for a high gradient magnetic separator for magnetic coagulation water treatment, the magnetic separator comprising: the permanent magnet auxiliary magnetic poles are arranged on the arc iron plates; the plurality of permanent magnetic main poles are arranged on the outer circumferential surface of the arc-shaped iron plate; and are uniformly distributed along the circumferential direction; the permanent magnetic auxiliary magnetic pole is arranged between two adjacent permanent magnetic main magnetic poles, and the radial length of each permanent magnetic main magnetic pole is greater than that of each permanent magnetic auxiliary magnetic pole; the arc length of one side of the permanent magnetic main pole far away from the arc-shaped iron plate is greater than that of one side of the permanent magnetic main pole close to the arc-shaped iron plate, and the arc lengths of the two sides of the permanent magnetic auxiliary pole in the radial direction are equal; the permanent magnetic auxiliary magnetic poles are arranged close to the left side and the right side of the permanent magnetic main magnetic pole, two ends of each auxiliary magnetic pole are shorter than the main magnetic pole, and the polarity of one side of the contact surface of each auxiliary magnetic pole and the main magnetic pole is the same as the outward polarity of the main magnetic pole.
Specifically, the inner side and the outer side of the auxiliary magnetic pole are inwards shrunk relative to the main magnetic pole along the length direction, namely the auxiliary magnetic pole is embedded between the left main magnetic pole and the right main magnetic pole, and the inner end and the outer end of the auxiliary magnetic pole are not exposed; the magnetic field intensity of the open type magnetic separator is enhanced, and the problems of magnetic flux leakage and magnetic loss in the arrangement of the magnetic field in the traditional magnetic separator are solved.
Further preferred, comprising: each permanent magnet main magnetic pole comprises an N pole and an S pole, and the N pole and the S pole are arranged at two ends along the radial direction of the permanent magnet main magnetic pole; and one ends of the two adjacent permanent magnet main poles, which are far away from the arc-shaped iron plate, are arranged in a staggered mode by N poles and S poles.
Further preferred, comprising: the permanent magnetic main pole is closely attached to the outer circumferential surface of the arc-shaped iron plate.
Further preferred, comprising: each permanent magnetic auxiliary magnetic pole is in clearance connection with the outer circumferential surface of the arc-shaped iron plate; the distance of clearance is 3~5 mm.
Further preferred, comprising: the radial difference value between the end surface of one side of the permanent magnetic main pole far away from the arc-shaped iron plate and the end surface of one side of the permanent magnetic auxiliary pole far away from the arc-shaped iron plate is 2-3 mm.
Further preferred, it comprises: the ratio of the arc length of one side of the permanent magnet main pole far away from the arc-shaped iron plate to the arc length of the two sides of the permanent magnet auxiliary pole is 3:2-4: 2.
Further preferred, comprising: the permanent magnet is made of neodymium iron boron rare earth.
Specifically, main magnetic poles of the rare earth permanent magnets are arranged on the arc pure iron plate in an alternating manner from N, S poles outwards along the circumferential direction, and auxiliary magnetic poles of the rare earth permanent magnets are arranged close to the left side and the right side of the main magnetic poles. The inside and outside sides of the auxiliary magnetic pole contract inwards along the radial length direction relative to the main magnetic pole, the arc length of the outside side of the main magnetic pole is larger than that of the inside side, and the polarity of the side of the contact surface of the auxiliary magnetic pole and the main magnetic pole is the same as that of the outside of the main magnetic pole. The open type high gradient magnetic separator formed by the method has large magnetic field intensity and deep action depth, avoids the problems of magnetic leakage and magnetic loss in the magnetic field arrangement in the traditional magnetic separator, reduces the cost of the permanent magnetic material by 20-40 percent, and can be widely used for treating various industrial sewage and domestic sewage, treating black and odorous river channels, purifying lake and river ground, precipitating tap water and pre-treating seawater desalination.
Specifically, the inner side and the outer side of the auxiliary magnetic pole are contracted inwards along the radial length direction relative to the main magnetic pole, the arc length of the outward side of the main magnetic pole is larger than that of the inner side, and the polarity of the contact surface of the auxiliary magnetic pole and the main magnetic pole is the same as that of the outward side of the main magnetic pole. The open high gradient high magnetic field emitted outwards formed by the arrangement method has large magnetic field intensity and deep action depth, the surface magnetic induction intensity can reach 10000-15000 gauss, and the distance of 10mm from the surface can reach 6000-8000 gauss.
The invention provides a magnetic field arrangement structure of a high-gradient magnetic separator for magnetic coagulation water treatment, which has the following beneficial effects:
1. the magnetic field arrangement structure adopted in the invention fundamentally changes the defects of the traditional magnetic field arrangement structure by applying the principle of the permanent magnet theory, not only enhances the magnetic field intensity of the open type magnetic separator, but also avoids the problems of magnetic flux leakage and magnetic loss in the magnetic field arrangement in the traditional magnetic separator. The waste of permanent magnetic materials is avoided while the magnetic field intensity is enhanced, and the cost of the permanent magnetic materials can be reduced by 20-40%. Therefore, the high-gradient magnetic separator manufactured by the structure has the characteristics of high performance and low cost.
2. According to the invention, aiming at the unfavorable condition that the high shearing force is generated due to the rapid flowing of the sludge when the micron-sized magnetic powder is recovered, the magnetic field arrangement structure with a special structure is successfully designed through a large number of tests on the basis of long-term practice, the problem of low recovery rate of the magnetic powder in the traditional method is solved, and the powerful guarantee is provided for the stable and efficient operation of the magnetic coagulation water treatment process.
3. In the invention, the magnetic powder loss rate is reduced by developing the high-performance magnetic separator, and the magnetic coagulation system is stably operated at low cost, thereby having important significance for the actual water treatment project.
Drawings
The above features, technical characteristics, advantages and realisations of the magnetic field arrangement of a high gradient magnetic separator for magnetic coagulation water treatment will be further explained in a clearly understandable way with reference to the accompanying drawings, which illustrate preferred embodiments.
FIG. 1 is a magnetic field configuration diagram of a high gradient magnetic separator for magnetic coagulation water treatment according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product.
As shown in fig. 1, the present application provides one embodiment of a magnetic field arrangement for a high gradient magnetic separator for magnetic coagulation water treatment, the magnetic separator comprising: the permanent magnet auxiliary magnetic poles are arranged on the arc iron plates; a plurality of permanent magnetic main poles are arranged on the outer circumferential surface of the arc-shaped iron plate; and are uniformly distributed along the circumferential direction; a permanent magnet auxiliary magnetic pole is arranged between two adjacent permanent magnet main magnetic poles, and the radial length of each permanent magnet main magnetic pole is greater than that of each permanent magnet auxiliary magnetic pole; the arc length of one side of the permanent magnetic main pole far away from the arc-shaped iron plate is greater than that of one side of the permanent magnetic main pole close to the arc-shaped iron plate, and the arc lengths of the two sides of the permanent magnetic auxiliary pole in the radial direction are equal; the permanent magnetic auxiliary magnetic poles are arranged close to the left side and the right side of the permanent magnetic main magnetic pole, and the polarity of one side of the contact surface of the auxiliary magnetic poles and the main magnetic pole is the same as the outward polarity of the main magnetic pole.
In particular, see fig. 1; the permanent magnets in this application include a main pole permanent magnet 1 and an auxiliary pole permanent magnet 2. The arc iron plate 3 is a pure iron plate; the permanent magnetic main pole 1 is installed on the arc pure iron plate 3, the auxiliary pole 2 is arranged closely to the main pole, the inner side and the outer side of the auxiliary pole are contracted inwards along the radial length direction relative to the main pole, namely the auxiliary pole is embedded between the left main pole and the right main pole, the inner end and the outer end are not exposed, and the arc pure iron plate is fan-shaped.
The magnetic field arrangement structure of the magnetic separator fundamentally changes the defects of the traditional magnetic field arrangement structure by applying the permanent magnet theory rule, not only enhances the magnetic field intensity of the open type magnetic separator, but also avoids the problems of magnetic leakage and magnetic loss in the magnetic field arrangement in the traditional magnetic separator.
Preferably, the method comprises the following steps: each permanent magnet main magnetic pole comprises an N pole and an S pole, and the N pole and the S pole are arranged at two ends along the radial direction of the permanent magnet main magnetic pole; the ends of the two adjacent permanent magnetic main poles far away from the arc-shaped iron plate are arranged in a staggered mode through N poles and S poles.
Preferably, the method comprises the following steps: the permanent magnetic main pole is tightly attached to the outer circumferential surface of the arc-shaped iron plate.
Preferably, the method comprises the following steps: each permanent magnetic auxiliary magnetic pole is in clearance connection with the outer circumferential surface of the arc-shaped iron plate; the distance of the gap is 3-5 mm.
Preferably, the method comprises the following steps: the radial difference value between the end surface of one side of the permanent magnetic main pole far away from the arc-shaped iron plate and the end surface of one side of the permanent magnetic auxiliary pole far away from the arc-shaped iron plate is 2-3 mm.
Preferably, the method comprises the following steps: the arc length of one side of the permanent magnetic main pole far away from the arc-shaped iron plate is larger than that of one side of the permanent magnetic main pole near the arc-shaped iron plate.
Preferably, the method comprises the following steps: the arc lengths of the two sides of the permanent magnet auxiliary magnetic pole in the radial direction are equal.
Preferably, the ratio of the arc length of one side of the permanent magnetic main pole far away from the arc-shaped iron plate to the arc length of the two sides of the permanent magnetic auxiliary pole is 3:2-4: 2.
Preferably, the method comprises the following steps: the permanent magnet is made of neodymium iron boron rare earth.
The present application also provides an embodiment: in the present embodiment; the main permanent magnetic pole is installed on the arc pure iron plate, the auxiliary magnetic poles are arranged in a manner of being tightly attached to the main magnetic poles, the inner side and the outer side of each auxiliary magnetic pole are contracted inwards along the radial length direction, the outer side of each auxiliary magnetic pole is contracted by 2mm, and the inner side of each auxiliary magnetic pole is contracted by 3 mm. Main poleThe ratio of the arc length of the outer side to the arc length of the auxiliary magnetic pole is 3: 2. The main magnetic pole is arranged in a manner that N, S poles are alternated outwards along the circumferential direction, and the polarity of one side of the contact surface of the auxiliary magnetic pole and the main magnetic pole is the same as the outward polarity of the main magnetic pole. The above arrangement structure forms an open type high-gradient high-intensity magnetic field which is emitted outwards, the magnetic field formed by the arrangement has large magnetic field intensity and deep action depth, the surface magnetic induction intensity can reach 15000 gauss, and the position 10mm away from the surface is 8000 gauss. Under the condition of the same magnetic field performance, the arrangement structure of the invention reduces the cost of the permanent magnet material by 20 percent. The high-gradient magnetic separator manufactured according to the arrangement structure is used for magnetic coagulation water treatment test, the change of the concentration of magnetic powder in the coagulation tank within 1 month is monitored under the stable operation condition, and 1m of magnetic powder is treated every time 3 When the supplementary concentration of the magnetic powder is 1g, the concentration of the magnetic powder in the coagulation pool can be kept unchanged, which shows that the loss rate of the magnetic powder is 1g/m 3 And (3) water.
This example shows that the magnetic powder loss rate can be reduced to 1g/m3 water level by adopting the arrangement structure of the invention, and the magnetic powder has ultrahigh recovery rate.
Specifically, when the auxiliary magnetic pole is retracted by 3mm from the outer side, the auxiliary magnetic pole is retracted by 4mm from the inner side. The ratio of the arc length of the outer side of the main magnetic pole to the arc length of the auxiliary magnetic pole is 4: 2. The above arrangement structure forms an open type high-gradient high-intensity magnetic field which emits outwards, the magnetic field formed by the arrangement has large magnetic field intensity and deep action depth, the surface magnetic induction intensity can reach 13000 gausses, and the position 10mm away from the surface is 7000 gausses. Under the condition of the same magnetic field performance, the arrangement structure of the invention reduces the cost of the permanent magnet material by 30 percent. The high-gradient magnetic separator manufactured according to the arrangement structure is used for magnetic coagulation water treatment test, the change of the concentration of magnetic powder in the coagulation tank within 1 month is monitored under the stable operation condition, and 1m of magnetic powder is treated every time 3 When the supplement concentration of the magnetic powder in the water is 1.2g, the concentration of the magnetic powder in the coagulation tank can be kept unchanged, which shows that the loss rate of the magnetic powder is 1.2g/m 3 And (3) water.
The embodiment shows that the arrangement structure of the invention can reduce the loss rate of magnetic powder to 1.2g/m 3 The water level and the magnetic powder have ultrahigh recovery rate.
Specifically, when the auxiliary magnetic pole retracts 3mm from the outer side, the auxiliary magnetic pole retracts from the inner side5 mm. The main magnetic pole is arranged in a manner that N, S poles are alternated outwards along the circumferential direction, and the polarity of one side of the contact surface of the auxiliary magnetic pole and the main magnetic pole is the same as the outward polarity of the main magnetic pole. The ratio of the arc length of the outer side of the main magnetic pole to the arc length of the auxiliary magnetic pole is 3: 2. The above arrangement structure forms an open type high-gradient strong magnetic field which is emitted outwards, the magnetic field formed by the arrangement has large magnetic field intensity and deep action depth, the surface magnetic induction intensity can reach 12000 gauss, and the position 10mm away from the surface is 6800 gauss. Under the condition of the same magnetic field performance, the arrangement structure of the invention reduces the cost of the permanent magnet material by 35 percent. The high-gradient magnetic separator manufactured according to the arrangement structure is used for magnetic coagulation water treatment test, the change of the concentration of magnetic powder in the coagulation tank within 1 month is monitored under the stable operation condition, and 1m of magnetic powder is treated every time 3 When the supplementary concentration of the magnetic powder in the water is 1.4g, the concentration of the magnetic powder in the coagulation pool can be kept unchanged, which shows that the loss rate of the magnetic powder is 1.4g/m 3 And (3) water.
This example shows that the magnetic powder loss rate can be reduced to 1.4g/m by adopting the arrangement structure of the invention 3 The water level and the magnetic powder have ultrahigh recovery rate.
Specifically, when the auxiliary magnetic pole retracts 3mm on the outer side, the auxiliary magnetic pole retracts 4mm on the inner side. The main magnetic pole is arranged in a manner that N, S poles are alternated outwards along the circumferential direction, and the polarity of one side of the contact surface of the auxiliary magnetic pole and the main magnetic pole is the same as the outward polarity of the main magnetic pole. The ratio of the arc length of the outer side of the main magnetic pole to the arc length of the auxiliary magnetic pole is 3: 2. The above arrangement structure forms an open high-gradient high-intensity magnetic field which is emitted outwards, the magnetic field formed by the arrangement has large magnetic field intensity and deep action depth, the surface magnetic induction intensity can reach 10000 Gauss, and the position 10mm away from the surface is 6000 Gauss. Under the condition of the same magnetic field performance, the arrangement structure of the invention reduces the cost of the permanent magnet material by 40 percent. The high-gradient magnetic separator manufactured according to the arrangement structure is used for magnetic coagulation water treatment test, the change of the concentration of magnetic powder in the coagulation tank within 1 month is monitored under the stable operation condition, and 1m of magnetic powder is treated every time 3 When the supplementary concentration of the magnetic powder is 2g, the concentration of the magnetic powder in the coagulation pool can be kept unchanged, which shows that the loss rate of the magnetic powder is 2g/m 3 And (3) water.
This example shows that the magnetic powder can be lost by adopting the arrangement structure of the inventionThe rate is as low as 2g/m 3 The water level and the magnetic powder have ultrahigh recovery rate.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (5)
1. A magnetic field arrangement for a high gradient magnetic separator for magnetic coagulation water treatment, the magnetic separator comprising: the permanent magnet auxiliary magnetic poles are arranged on the arc iron plates;
the outer arc length of the permanent magnetic main pole is greater than the inner arc length, namely the outer side of the permanent magnetic main pole is wide and the inner side of the permanent magnetic main pole is narrow, and the inner arc length and the outer arc length of the permanent magnetic auxiliary pole are equal;
the permanent magnetic auxiliary magnetic pole is tightly attached to the permanent magnetic main pole and is staggered with the permanent magnetic main pole, two ends of the auxiliary magnetic pole are shorter than the main pole and are in a state of shrinking inwards, and the polarity of one side of the contact surface of the auxiliary magnetic pole and the main pole is the same as that of the outer side of the main pole;
the outer side end of each permanent magnetic main pole comprises an N pole and an S pole which are arranged in a staggered mode;
the plurality of permanent magnetic main poles are arranged on the outer circumferential surface of the arc-shaped iron plate; and are evenly distributed along the circumferential direction.
2. The magnetic field arrangement of a magnetic separator for magnetic coagulation water treatment of claim 1, comprising: the permanent magnetic main pole is closely attached to the outer circumferential surface of the arc-shaped iron plate; the ratio of the arc length of the outer side of the permanent magnetic main pole to the arc length of the adjacent permanent magnetic auxiliary pole is 3:2-4: 2.
3. The magnetic field arrangement of a magnetic separator for magnetic coagulation water treatment of claim 1, comprising: the end surface of the inner side of each permanent magnetic auxiliary magnetic pole is in clearance connection with the outer circumferential surface of the arc-shaped iron plate; the distance of clearance is 3~5 mm.
4. The magnetic field arrangement of a magnetic separator for magnetic coagulation water treatment of claim 1, comprising: the radial difference value between the end surface of the outer side of the permanent magnetic main pole and the end surface of the outer side of the permanent magnetic auxiliary pole is 2-3 mm.
5. The magnetic field arrangement of a magnetic separator for magnetic coagulation water treatment according to any one of claims 1 to 4, comprising: the permanent magnet main magnetic pole and the permanent magnet auxiliary magnetic pole are made of neodymium iron boron rare earth.
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