JPH09125272A - Treatment of waste water of strip washing and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to efficiently remove the iron making sludge included the waste water produced after washing of the strip of the strip pass line of iron making industry by installing a magnet type magnetic separator in the flow of the waste water. SOLUTION: The waste water of washing in the strip pass line of the iron making industry is passed to a treating tank a1 which has a iron powder sludge settling chamber in the bottom and constitutes horizontal flow. The iron powder sludge in the water to be treated in an upper area 1a is captured and separated by the magnetic separator 6 consisting of sleeves of nonmagnetic materials distributing in the water area in the treating tank, roll-shaped rotors extending in the longitudinal direction in these sleeves and magnets expanded and installed on the peripheral surfaces of these rotors in the form of arranging polarities alternately with N and S in the circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment method and a treatment apparatus for removing iron powder sludge contained in wastewater from a wastewater obtained by washing strips of a strip path line of the ironmaking industry by a magnetic separator of a magnet type.

In the present specification, the magnetic separator is a device for removing iron powder sludge in the water to be treated by magnetic force, and this is the same in the claims and the following description.

[0003]

2. Description of the Related Art Conventionally, it has been practiced to remove iron powder sludge from a waste water used for this type of cleaning by a magnetic type magnetic separator. However, the efficiency of removing iron powder sludge was not sufficient depending on the conventional specifications. It is due to the following.

The water used for cleaning the strip of the steel industry strip pass line is generally returned to the strip cleaning step and reused, that is, circulated for reuse. This is because this is advantageous in terms of running cost for strip cleaning.

Conventionally, the circulating pipe of the water is provided with a treatment tank equipped with a magnet type magnetic separator, and in this treatment tank, iron powder sludge in the strip cleaning waste water to be treated is magnetically separated. The process of removing is performed. The treatment tank has a cylindrical or rectangular shape, and the water to be treated is introduced into and discharged from the tank through a general pipe.

When the water to be treated is passed through the treatment tank of such a shape under the above circulating water, the water in the treatment tank flows upstream and downstream. For this reason, when the iron powder sludge sucked and captured by the magnetic separator is released from this, the released iron powder sludge rides up and down in the processing tank and hinders sedimentation considerably.

Conventionally, in order to release the iron powder sludge attracted and captured by the magnet type magnetic separator, it is necessary to scrape it off with a scraper. According to this, since magnetic induction works on the iron powder sludge even during scraping, the release is not effective and the effect of removing the iron powder sludge becomes insufficient.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to install a magnetic type magnetic separator in the flow of waste water that has washed the strips of a strip path line in the steel industry to efficiently remove the iron powder sludge contained in the water. An object of the present invention is to provide a processing method and a processing device that can be removed well.

[0009]

The features of the processing method of the present invention are as follows.

(A) The strip cleaning wastewater of the strip pass line of the steel industry is flowed into a treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the strip cleaning waste water is introduced into and out of the flow path by the tank. On the side, the flow is rectified by the rectifier in the length direction of the flow path. Then, under this rectification, the iron powder sludge in the strip cleaning wastewater is captured and separated by a magnetic method in the flow path.

In the treatment method (A), the magnetic method for capturing and separating the iron powder sludge is preferably any one of the following magnetic separators (1), (2) and (3), or (1) And (2) or (1) and (3) are combined, but a magnetic separator known per se that captures and separates iron powder sludge in strip cleaning wastewater by magnetic action is used. It does not prevent the specification from being met.

(B) Or, the strip cleaning wastewater of the strip path line of the steel industry is made to flow into a treatment tank having a horizontal flow path having an iron powder sludge settling tank, and the iron powder in the waste water is flowed in the flow path. A method for capturing and separating sludge by a magnetic separator, wherein the magnetic separator has any of the following (1), (2), (3) or (1) and (2).
Or the combination of (1) and (3).

(1) A sleeve made of a non-magnetic material that is vertically distributed in the water tank in the processing tank, a roll-shaped rotor extending in the sleeve length direction in the sleeve, and substantially the rotor peripheral surface. , A magnetic separator having magnets arranged with N and S alternately arranged in the circumferential direction of the rotor and mounted in a spiral development like a multiple thread. This magnetic separator is
The rotor thereof is rotated, and the iron powder sludge in the water in the flow path of the processing tank is attracted to the magnet while the partition wall of the sleeve is interposed.

(2) A sleeve made of a non-magnetic material, which is horizontally and horizontally arranged in water in the processing tank in parallel, a roll-shaped rotor extending in the sleeve length direction in the sleeve, and the rotor peripheral surface. A magnetic separator having magnets whose polarities are alternately arranged N and S in the circumferential direction of the rotor and which are attached by a spiral expansion like a multiple thread. This magnetic separator rotates its rotor to attract the iron powder sludge in the water in the flow path of the processing tank to the magnet while the partition wall of the sleeve is interposed.

(3) A sleeve made of a non-magnetic material, which is horizontally spread side by side in water in the processing tank, and a roll-shaped rotor extending in the sleeve length direction at a position eccentric upward in the sleeve. , And substantially on the rotor circumferential surface,
A magnetic separator having magnets mounted in such a manner that the polarities are alternately arranged N and S in the circumferential direction of the rotor. This magnetic separator rotates its rotor to attract the iron powder sludge in the water in the flow path of the processing tank to the magnet while the partition wall of the sleeve is interposed.

In the case of the combination of (1) and (2) or (1) and (3), one of the magnetic separators is the first magnetic separator,
The other is a second magnetic separator, in which the first magnetic separator is arranged on the upper side in the flow path by the processing tank, and the second magnetic separator is arranged on the lower side in the flow path, The rotor of the first magnetic separator is rotated in a direction in which the iron powder sludge on the sleeve peripheral surface thereof is moved downward.

In the treatment method (B), it is preferable that the water in the flow passage is rectified by a rectifier in the length direction of the flow passage on the inlet side and the outlet side of the flow passage by the treatment tank.

The features of the processing apparatus of the present invention are as follows.

(A) A processing tank having a horizontal flow path having an iron powder sludge settling tank at the bottom is installed, and strip cleaning wastewater flowing through the flow path by the processing tank is flowed in the flow path length direction at the flow path inlet side. And a rectifier for rectifying the strip cleaning wastewater in the flow channel length direction on the flow channel outlet side in the processing tank. The magnetic separator for capturing and separating the iron powder sludge in the strip cleaning waste water in (1).

In the treatment apparatus of (A) above, the magnetic separator is preferably any one of the following a, b, c, a combination of a and b, or a combination of a and c. It does not interfere with the filling of what is known per se, which captures and separates the iron powder sludge by magnetic action.

(B) A treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom is installed, and the treatment tank is provided with a magnetic separator. Either b or c or a combination of a and b or a combination of a and c.

A. A sleeve made of a non-magnetic material that is vertically distributed in the water tank in the processing tank, a roll-shaped rotor that extends in the sleeve length direction in the sleeve, and a rotor circumferential surface whose polarity is substantially the circumference of the rotor. A magnetic separator having magnets mounted in a N- and S-alternating direction alternately and developed by developing a spiral with a multiple thread, wherein iron powder sludge in the water in a flow path by a processing tank is attached to the magnet. A magnetic separator that sucks under the interposition of a partition wall by the sleeve.

B. A sleeve made of a non-magnetic material, which is horizontally and horizontally arranged in water in the processing tank, and a roll-shaped rotor extending in the sleeve length direction in the sleeve;
And a magnetic separator having magnets whose polarities are alternately arranged in N and S in the circumferential direction of the rotor in a circumferential direction of the rotor and which are attached by a spiral expansion like a multi-thread screw. A magnetic separator for sucking iron powder sludge in the water in the flow path of the processing tank while the partition wall is interposed by the sleeve.

C. A sleeve made of a non-magnetic material that horizontally and horizontally extends in the processing tank in a horizontal direction, a roll-shaped rotor extending in the sleeve length direction at an eccentric upward position in the sleeve, and the rotor peripheral surface. A magnetic separator having magnets mounted in a manner such that the polarities thereof are alternately arranged N and S in the circumferential direction of the rotor.
A magnetic separator for attracting to the magnet iron powder sludge in water in a flow path formed by a processing tank with a partition wall formed by the sleeve. In the case of the combination of a and b or a and c, one of the magnetic separators is the first magnetic separator and the other is the second magnetic separator,
They have a first magnetic separator arranged on the upper side in the flow path of the processing tank and a second magnetic separator arranged on the lower side in the flow path.

In the processing apparatus (B), it is preferable that the water in the flow path is rectified by the rectifier in the length direction of the flow path on the inlet side and the outlet side of the flow path of the processing tank.

In the present invention, the rotor in the sleeve is
When the magnet on the peripheral surface has a spiral shape like the above-described multi-thread screw, the extension in the sleeve may be eccentric with respect to the sleeve, or may be concentric.

In the present specification, the term "expansion" with respect to the magnet according to the present invention is used in a broad sense including distribution. This also applies to the claims and the following description.

[0028]

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described with reference to the drawings showing examples of embodiments of the present invention.

The strip S of the strip pass line in the iron and steel industry passes through the washing step P, and in that step, washing water is jetted from the nozzle (not shown) to the strip in the same manner as in the prior art to be washed. The strip cleaning process P is schematically shown in FIG. 1 as a block diagram, and the strip S of the pass line is shown in the block diagram.
The strip is polished by the brush rolls 1 and 2 concurrently with the cleaning. The strip may be washed rather than polished.

The strip cleaning waste water in the process P is introduced into the tank T through the pipe 3. In the illustrated embodiment, two tanks T are installed. The treated water introducing pipes 31, 31 of the two tanks T are changed by switching the switching valve 32.
Either is communicated with the pipe 3. In the illustrated embodiment, the tank T includes an upper area a1 and a lower area a2 connected to the bottom thereof, and the upper area a1 serves as a processing tank and the lower area a.
2 is filled in the iron powder settling tank.

The upper area a1 of the tank T is a horizontal flow path. The flow path is preferably straight. The flow path formed by the tank upper area a1 is provided with rectifiers 4 and 5 for rectifying the cleaning drainage, that is, the water to be treated in the flow path length direction on the inlet side and the outlet side thereof.
It is advisable to make the flow of the water to be treated substantially uniform in the flow channel length direction. In this way, when the flow of the water to be treated is rectified in the length direction of the flow path on the inlet side and the outlet side of the flow path by the upper area a1, the flow of the water in the flow path does not occur in the upstream and downstream, or hardly occurs. Absent.

If the water flowing through the flow path does not flow upstream or downstream, or hardly occurs, water does not flow upstream or downstream even in the area a2, and therefore the iron powder sludge settled in the area a2 from the area a1 efficiently. Settle in area a2.

As a preferable example of the rectifier 4 on the inlet side of the flow path, one having the following structure can be mentioned.

An intake housing is provided with straightening vanes 41 having perforations 40 distributed substantially evenly over the entire surface and arranged in parallel in a front-rear multi-stage manner. 4'rectifier. This housing 4'has a water intake port 42 communicating with the pipe 3 substantially at the center of the front wall (the wall opposite to the tank T). Housing 4 '
The water flowing inside is rectified in multiple stages by front and rear rectifying plates 41. The first straightening vane 41-l and the intermediate straightening vane 41-m may be arranged in the housing 4 ', and the necessary holes 40 are formed in the rear wall of the housing 4'in the final straightening vane 41-n. It is good to provide and fill the rear wall. The perforations 40 in the rear wall are opened to the flow path defined by the tank upper area a1.

As described above, the rectifier 4 has the straightening vanes 41 arranged in multiple stages in the front-rear direction, and the perforations 40 that are substantially evenly distributed over the entire straightening vanes are arranged in the rear stage, that is, the perforations of the downstream straightening vanes. If the number is small and the diameter is small, the multi-stage rectification action by these rectification plates 41 is strengthened toward the downstream side, and the obtained rectification result is sufficiently high, and the upper surface a1 is above the treated water flowing through the flow path. It improves downstream avoidance, and effectively weakens the water flow with the multistage rectification.

As a preferable example of the rectifier 5 on the outlet side of the flow path, one having the following structure can be cited.

A straightening vane 51 having perforations 50 distributed almost evenly over the entire surface and arranged in parallel in a front-rear multistage manner is provided. Rectifier with housing 5 '. The housing 5'has a water outlet 52 at approximately the center of the rear wall (the wall opposite to the tank T). The housing 5 ′ rectifies the water flowing therein in multiple stages by the rectifying plates 51 in the front and rear stages.
The intermediate straightening plate 51-m and the final straightening plate 51-n may be arranged in the housing 5 '.
-L may be provided with the required perforations 50 on the front wall of the housing 5'and fill said front wall. This front wall perforation 50 is
The flow path is opened to the upper area a1.

As described above, the straightening device 5 has the straightening vanes 51 arranged in multiple stages in the front-rear direction, and the perforations 50 which are substantially evenly distributed over the entire straightening vanes are arranged in the rear stage, that is, the perforations in the downstream straightening plate. If the number is small and the diameter is large, the multi-stage rectification effect by these rectification plates 51 becomes stronger toward the upstream side, and the obtained rectification result is sufficiently high, and the rectification result at the flow path inlet side by the upper area a1 is sufficiently high. Is sufficiently high as shown above, and the rectification of the entire flow in the same flow path is extremely good. As a result, the upstream and downstream avoidance of the water to be treated flowing through the flow path is further improved.

Intake of treated water in the flow path by the upper area a1 (in the example of the figure, intake 42 of the inlet side rectifier 4) and outlet (in the example of the figure, outlet 52 of the outlet side rectifier 5). )
Should be placed on the same level. If they are at the same level, there is no difference in height between the water inlet side and water outlet side in the upper area a1, and the upstream / downstream avoidance effect of the water flow in the upper area a1 is improved.

The amount of treated water discharged from the water discharge port 52 is preferably set to an amount commensurate with the amount of water to be treated flowing into the upper area a1 through the water intake port 42. If you do so,
The water flow in the upper area a1 can be maintained at a constant water level, and the rectifiers 4 and 5 can more effectively make the flow in the area uniform in a predetermined direction.

A magnetic separator 6 for capturing and separating iron powder sludge in the water to be treated is provided in the upper area a1.

When rectifying the water flowing in the flow path by the rectifiers 4 and 5 on the inlet side and the outlet side of the flow path by the upper area a1, the magnetic separator 6 has the following a. It is preferable to use any of the above, or a combination of a and b or a combination of a and c, but it is possible to capture and separate the iron powder sludge in the water to be treated by a magnetic action, even if a known per se is used. Good.

The magnetic separators 6 are installed alone or side by side in the vertical direction.

In the case of a single installation, the magnetic separator 6 may have the following constitution (a), (b) or (c).

The magnetic separator 6 is shown schematically in block diagrams in FIGS. 1, 2 and 3, and details are shown in FIGS.

The magnetic separator 6 has a non-magnetic sleeve 61, a roll-shaped rotor 62 and a magnet 63 which will be described later.

(A) The non-rotating sleeve 61 of the magnetic separator 6 is arranged vertically in the upper area a1 and distributed in the water area (see FIGS. 13 and 14). The rotor 62 extends in the lengthwise direction of the sleeve 61, and the magnets are developed on the peripheral surface of the rotor 62 in a spiral shape like a multi-thread screw so that the polarities are alternately arranged N and S in the circumferential direction of the rotor. 63 is attached.

The expansion of the multi-threaded screw-like spiral shape of the magnet 63 in the above-described embodiment can be performed as shown in FIG. 17, for example. In the form of FIG. 17, a spiral magnet 63 having a multiple thread form has one magnetic pole on the front surface side and the other magnetic pole on the other surface side, that is, the rotor 62 side. The polarities N and S shown in the figure are the polarities of the magnetic poles on the front surface side.

The magnet 63 attracts the iron powder sludge in the water in the flow path by the upper area a1 under the interposition of the partition wall by the sleeve 61.

In the type (a), the rotor 62 may extend in the sleeve 61 concentrically with respect to the sleeve 61 (FIG. 11) or eccentrically (FIG. 12). Good.

In the type (a), the rotor 62 can be rotated in the direction in which the iron powder sludge attracted by the magnet 63, that is, the iron powder sludge on the peripheral surface of the sleeve 61, is moved downward while the partition wall is formed by the sleeve 61. preferable.

(B) An arrangement in which the magnetic separators 6 are horizontally spread horizontally in the area a1 in the horizontal direction (FIG. 15, FIG.
16) except that the magnetic separator 6 is basically the same as the magnetic separator 6 in the above (a). That is, the non-rotational sleeve 61 of the magnetic separator 6 is arranged horizontally in the area a1 in the horizontal direction in parallel with the sleeve 61. The sleeve 61 has a multi-row structure similar to that in (a) above. A rotor 62 having a screw-like spiral magnet 63 on its peripheral surface is extended in the same manner as in (a) above.

The magnet 63 attracts the iron powder sludge in the water in the flow path by the upper area a1 under the interposition of the partition wall by the sleeve 61.

In the type (b), the rotor 62 has the iron powder sludge attracted by the magnet 63, that is, the iron powder sludge attached on the peripheral surface of the sleeve 61 under the interposition of the partition wall by the sleeve 61, on one end side of each sleeve 61, for example, the tip end. It is preferable to rotate in the direction of shifting to the side.

Fins 64 extending in the lengthwise direction of the sleeve 61 are formed on the outer peripheral surface of the end of the sleeve 61 of the magnetic separator 6 of the types (a) and (b) on the side where iron powder sludge is transferred. It is preferable. In this case, although not necessarily limited, the fins 64 may be arranged on both sides when the rotor 62 is concentric with the sleeve 61, and when the rotor 62 is eccentric with respect to the sleeve 61, its eccentricity It should be placed on the side where

(C) The non-rotating type sleeve 61 of the magnetic separator 6 is arranged horizontally in the upper area a1 in the horizontal direction in parallel with the water (see FIGS. 15 and 16). A roll-shaped rotor 62 extends in the lengthwise direction of the sleeve 61 at an eccentric position upward (FIG. 12), and the polarity is substantially N and S alternately arranged in the circumferential direction of the rotor on the circumferential surface of the rotor. The magnet 63 is attached by expansion.

The unfolding of the magnet 63 is, for example, a spiral shape like a multiple thread similar to that described in the type (a) above, a chevron-like plate shape as shown in FIG.
It is possible to form a corrugated plate-like pattern as shown in FIG. 2 and a stripe-shaped pattern as shown in FIG. 18 to 20
In the magnet 63, the front surface side is one magnetic pole, and the other surface side, that is, the rotor 62 side is the other magnetic pole. The polarities N and S shown in the figure are the polarities of the magnetic poles on the front side.

The magnet 63 attracts the iron powder sludge in the water in the flow path by the upper area a1 under the interposition of the partition wall by the sleeve 61.

In the type (c) in which the magnet 63 is developed in a spiral shape like a multiple thread screw in the above-described mode,
The rotor 62 can rotate the iron powder sludge attracted by the magnet 63, that is, the iron powder sludge attached to the circumferential surface of the sleeve 61, to one end side on the same side of each sleeve 61, for example, to the tip side while the partition wall is formed by the sleeve 61. preferable.

When the magnet 63 is of the type (c) and has a spiral shape like a multiple thread, and the rotation of the rotor 62 is of this type, the side of the sleeve 61 of the magnetic separator 6 to which the iron powder sludge is transferred. It is preferable to form fins 64 extending in the sleeve length direction on the outer peripheral surface of the terminal portion. The fin 64 may be arranged on the top of the sleeve 61.

In any of the types (a), (b) and (c), the rotor 62 of the magnetic separator 6 can be the one directly coupled to the motor M.

In the upper and lower side, the magnetic separator 6 is the same as the above (a).
The combination of the configuration of (b) and the configuration of (b) or the combination of the configuration of (a) and the configuration of (c), one magnetic separator of which is the first Magnetic separator 6-1
And the other magnetic separator is the second magnetic separator 6-2. The first magnetic separator 6-1 is filled with the structure of (a), and the second magnetic separator 6-2 is filled with the structure of (b) or (c). First magnetic separator 6
-1 is arranged on the upper side in the flow path by the upper area a1,
The second magnetic separator 6-2 is arranged below the flow path.

An example of an upper and lower type is shown in FIGS. In FIGS. 1 and 3, the omission of the first or second magnetic separator corresponds to an illustration of an example of a single installation of the magnetic separator.

In the present invention, the strip cleaning waste water of the strip path line of the steel industry flows from the inlet side to the outlet side in the processing tank having a horizontal flow path, in the illustrated example, the tank upper area a1. Water, that is, iron powder sludge in the water to be treated, is attracted by the magnet 63 in the magnetic separator 6 in the area under the interposition of the partition wall of the non-magnetic sleeve 61 and adheres to the peripheral surface of the sleeve 61. The iron powder sludge attached to the peripheral surface of the sleeve 61 does not move on the peripheral surface of the sleeve 61 integrally with the rotational displacement of the magnet 63 attached to the rotor 62. The reason for this is not clear, but it seems that the adhesion to the sleeve and / or the water resistance influences it.

The iron powder sludge attached to the circumferential surface of the sleeve 61 is settled and collected in the area a2 below the area a1 of the tank T in the following manner.

The magnetic separator 6 has the above-mentioned (a), (b),
In any of the configurations of (c), the arrangement of the magnets 63 on the circumferential surface of the rotor 62 is substantially an arrangement in which N and S are alternately arranged in the circumferential direction of the rotor. Therefore, in these magnetic separators 6, the rotation of the rotor 62 causes the magnets 63 to be displaced alternately at the N and S poles at the locations where the magnets 63 face the busbars of the sleeve 61. Therefore, by rotating the rotor 62 at an appropriate speed, the iron powder sludge on the peripheral surface of the sleeve 61 is
While the remanent magnetism is still present, the rotation of the rotor 62 causes the magnet having the same polarity as the remanent magnetism of the iron powder sludge to be displaced to the location of the iron powder sludge, and the repulsion caused by the magnet causes the iron powder sludge to go around the sleeve 61. Away from the surface, ie released from said suction. The opening and the suction and trapping of the iron powder sludge prior to the opening are continuously performed by the rotation of the magnet 63 accompanying the rotor 62. Therefore, according to the magnetic separator 6 of the present invention, the magnet 6 that develops in a predetermined manner is used.
With the progress of rotation of the rotor 62 of No. 3, the iron powder sludge in the water to be treated can be efficiently captured, and the suction of the captured iron powder sludge can be efficiently released.

Thus, the magnetic separator 6 is (a),
In any of the configurations (b) and (c), the magnetic separator is arranged in the flow of the water to be treated, and the effect of efficiently capturing and removing the iron powder sludge from the water is obtained.

If the rotor 62 is concentric with the sleeve 61, the iron powder sludge is attracted to and released from the peripheral surface of the sleeve 61. It is made stronger or on the eccentric side.

In the case where the magnet 63 is developed in a spiral shape like a multi-thread screw, the iron powder sludge is moved to the one end side on the circumferential surface of the sleeve 61 according to the rotation of the rotor 62, and the suction is performed. ， The opening is done.

When a magnetic separator known per se is used in place of the magnetic separators of the above-mentioned (a), (b) and (c), the iron powder sludge in the water to be treated should be removed by magnetic force. It is the same as the conventional one. However, in this case, in the present invention, the water to be treated flowing in the upper area a1 is rectified by the rectifier 4 at the area entrance side and the rectifier 5 at the area exit side.
The area is rectified in the flow path length direction. When doing so, unlike the case of such a free flow that does not receive water control such as rectification on the inlet side and the outlet side, the water to be treated does not occur upstream or downstream, or hardly occurs, Since the iron powder sludge released from the magnetic separator 6 passes through the upper area a1, the iron powder sludge does not soar into the upper area a1 and the sedimentation of the iron powder sludge in the area a1 becomes effective.

In the magnetic separator 6 in which the magnet 63 is developed in a spiral shape like a multiple thread screw, in the configuration (a), the rotor 62 is rotated in the required direction, whereby the iron powder sludge on the peripheral surface of the sleeve 61 in the vertical arrangement is rotated. Can be settled from the lower end of the sleeve 61, that is, from a position closer to the area a2, and the collection of the iron powder sludge in the area a2 becomes more effective.

In the magnetic separator 6 of which the expansion of the magnet 63 is in the form of a multi-threaded screw-like spiral (b) and (c), the rotor 62 is rotated in the required direction so that the horizontal surface of the sleeve 61 is covered. Iron powder sludge for each sleeve 61
Can be cumulatively collected on the same side edge of, thus effectively settling in the upper area a1. In any of these cases, when a fin 64 extending in a predetermined direction is formed on the outer peripheral surface of the end portion of the sleeve 61 on the predetermined side, the fin 64 acts as a substantial scraper for the iron powder sludge, and Helps open the sludge.

The magnetic separator 6 is constructed in the upper and lower type (a)
Both the combination of (b) and (b) and the combination of (a) and (c) rotate the rotor 62 in the first magnetic separator 6-1 in a predetermined direction, so that the sleeve 61 in the first magnetic separator 6-1 is rotated. The downward movement of the iron powder sludge on the peripheral surface can be utilized to transfer the iron powder sludge from the first magnetic separator to the second magnetic separator, so that the iron powder sludge is substantially separated from the second magnetic separator. It will be collected in the form of being accumulated in the magnetic separator, and the recovery effect of the iron powder sludge will be improved.

When the flow of water in the flow path by the upper area a1 does not occur upstream or downstream, or hardly occurs, the water does not flow upstream or downstream in the area a2 of the tank T below the flow path, or It hardly happens. Therefore, the iron powder sludge released from the suction by the magnetic separator 6 in the upper area a1 effectively settles in the area a2 and efficiently settles in the bottom of the tank T.

The iron powder sludge deposited on the bottom of the tank T is
When it becomes a proper amount, the valve 7 of the discharge pipe 7 at the bottom of the tank T
Open 1 and discharge. The valve 71 can be a solenoid valve or a motorized valve.

The treated water, from which iron powder sludge has been removed by the magnetic separator 6 and which is discharged from the outlet side of the flow path by the upper area a1, can be returned to the strip cleaning step P and reused. To return the treated water to the cleaning step P, for example, a specification may be used in which the outlet side of the flow path of the upper area is connected to the pipe 12 for supplying the cleaning water to the cleaning step P. In this case, in order to prolong the service life of the wash water, when always supplying an appropriate amount of fresh wash water to the wash water circulation circuit, remove the amount of untreated wash wastewater that corresponds to the new wash water supply amount to the outside of the system. It is good to discharge. By doing this, it is possible to prevent iron powder sludge from increasing in the wash water by circulating the wash water.

When the internal water in the upper area a1 contains oil (when the strip to be cleaned has oil adhered and the water used for cleaning this is an alkaline liquid), the following configuration is taken, for example. You should deal with it.

As shown in FIG. 3, a purified water extraction duct 8 having a vertical U-shape with the flow path formed by the upper area a1 and having a bottom continuous with the flow path is provided next to the flow path. The ducts 8 are installed in parallel, and an overflow port 9 is provided at one end side of the duct 8 (on the left and right in FIGS. 1 and 2), preferably on the rear end (right side in FIGS. 1 and 2). Further, a dirt extraction duct 10 is attached to the side wall of the flow path formed by the upper area a1, preferably on the side wall opposite to the duct 8, and the duct 10 corresponds to the upper layer portion of the internal water of the flow path, preferably the inside. The overflow port 11 communicates with a position higher than the water level.

According to this structure, the purified water extraction duct 8 contains a portion of the water purified by the magnetic separator 6 to remove the iron powder sludge in the upper area a1 and flows out through the overflow port 9 by overflow. . The treated purified water, which is the discharged water, can be returned to the strip cleaning step P. For example, the reflux can be performed by connecting the overflow port 9 to a pipe 12 that supplies cleaning water to the cleaning process P.

On the other hand, oil and dirt floating on the water surface of the internal water of the flow path due to the upper area a1 raises the water level of the internal water to an appropriate height as necessary, and the dirt extraction duct 10 collects the water in the area a1. It can be discharged by overflow from the overflow port 11 together with the upper layer water. Water containing oil and dirt collected in the duct 10 is discarded. The amount of water discharged to the duct 10 may be an amount commensurate with the amount of the purified water extracted. The discharge amount control of water containing oil and dirt is performed by, for example, the mouth 9
It can be designed by using either or both of the opening degree and the height difference correlating with Nos. 11 and 11.

When the overflow port 11 is located at a position higher than the overflow port 9, extraction of the purified water by overflow can be performed without interruption even when the upper layer water of the water in the upper area a1 is discharged. The reflux of the wash water can be stably performed. The height of the overflow port 11 with respect to the overflow port 9 may be small.

To raise the water level in the upper area a1, for example, a new washing water tank (not shown) may be connected to the pipe 3 to increase the amount of washing water stored in the tank.

When the water to be treated contains fiber waste (when the strip to be cleaned is washed by brushing), a filter 13 for removing fiber waste in the water to be treated is preferably provided in the flow path defined by the upper area a1 in the present invention. .

The filter 13 is provided for convenience of simplifying the drawing.
Only in FIGS. 1 and 2, the chain line is shown schematically.

The filter 13 may be of a sheet filter material type that can be drawn out and is immersed in water in the flow path defined by the upper area a1. A preferable example of the sheet filter material of the filter 13 is a mesh filter material.

The payout mode of the filter 13 is, for example, as the downstream side of the area a1 of the sheet filter medium, in which the pay-off reel 1 is used.
4 is rolled up from the roll-wound sheet filter medium 130, and the upstream side of the area a1 is delivered to the rolls 15, 15.
It can be a specification that leads to.

Sheet filter material type filter 13 that can be drawn out
Is preferably a sheet filter medium type that extends in the transverse direction of the flow path by the upper area a1 and hangs in water of the flow path in a U-shape in the length direction of the flow path.

The filter 13 may be arranged in the upper area a1 side by side with the magnetic separator 6 in the front direction of the area (horizontal direction in FIGS. 1 and 2). The arrangement may be either upstream or downstream of the magnetic separator 6.

The water to be treated is filtered by the filter 13 in the upper area a1.
When it flows through the point of, the filter 13 removes the fiber waste in the same water. In this case, the filter 13 is located in the upper area a
In the case of a sheet filter material type that can be drawn out by submersion in water in the flow path according to 1, when the filtering effect of the filter 13 decreases due to the progress of operation, the sheet filter material at a new portion is drawn out and put into the water in the flow path. Unlike conventional stationary filters, such as the ability to transfer and renew the function of the filter 13, the removal of fiber debris from the water to be treated can be purposefully performed.

Sheet filter material type filter 13 which can be drawn out
However, in the case of extending in the transverse direction of the flow path by the upper area a1 and hanging down in the U-shape in the flow path length direction, the initially downstream side of this U-shaped hanging part is moved to the upstream side, and to the trace. A new sheet filter medium is transferred, that is, the U-shaped hanging part is moved to the area a1.
With respect to the flow of the water to be treated, the filter 13 can be displaced and updated countercurrently, and the filter 13 can be operated more appropriately. Even if the upstream side portion 13a of the U-shaped hanging portion has progressed in operation and the filterability has decreased to the limit, the downstream side portion 13b has slower operation progress than the upstream side portion and still retains the filterability. Such countercurrent dislocation, renewal of the U-shaped sag results in the utilization of the still retained filtering capacity of the downstream side 13b.

In the present invention, when the water in the flow passage is rectified in the lengthwise direction of the flow passage on the inlet side and the outlet side of the flow passage by the upper area a1, that is, the processing tank, the inflow of water into the flow passage, If the water discharge from this is cut off, the water in the tank T will be in a stationary state or a state in which it hardly flows in a short time (these two states are collectively referred to as stationary). This is because, as described above, the water flowing in the length direction of the flow path by the upper area a1 does not flow upstream or downstream, and on the basis of this, the water in the area a2 also does not flow upstream or downstream. When the water in the tank T is allowed to stand, the sedimentation of the iron powder sludge in the tank T becomes more effective. If the water in the tank T is allowed to stand still within a short time after the inflow of water and the discharge of water in the area a1, the running costs associated with the sedimentation and separation of the iron powder sludge in the water to be treated can be reduced.

When the iron powder sludge is settled by refraining from the inflow or discharge of water to the area a1 which is a treatment tank, at least two tanks T are installed, and water inflow and discharge of water are stopped for any of them. It is preferable that the washing water is kept circulated between the step P and the washing water. According to this, the strip cleaning in the process P is interrupted by the stoppage of the inflow and discharge of water, and the quality of the strip is not deteriorated.

[0093]

As described above, according to the present invention, a magnet type magnetic separator is installed in the flow of waste water after cleaning the strip of the strip path line of the iron making industry to efficiently remove the iron powder sludge contained in the water. There is an effect that can be done.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a water treatment device according to the present invention.

FIG. 2 is a plan view of the device shown in FIG.

3 shows a cross-sectional view of the device of FIG.

FIG. 4 (A) is a perspective view of a rectifier on the flow path inlet side by the tank upper area, and FIG. 4 (B) is a perspective view of the rectifier on the flow path outlet side.

FIG. 5 shows a front view of a first rectifying plate in the rectifier on the input side.

FIG. 6 is a front view of a second (intermediate) rectifying plate in the inlet side rectifier.

FIG. 7 shows a front view of a third (last stage) rectifying plate in the same inlet rectifier.

FIG. 8 is a front view of a first rectifying plate in the rectifier on the output side.

FIG. 9 shows a front view of a second (intermediate) rectifying plate in the output side rectifier.

FIG. 10 is a front view of a third (last stage) rectifying plate in the output side rectifier.

11 (A) is a side view showing an example of a magnet type magnetic separator according to the present invention, and FIG. 11 (B) is FIG.
It is an end view of (A).

12 (A) is a side view showing another example of the magnet type magnetic separator according to the present invention, and FIG. 12 (B) is FIG.
It is an end view of (A).

FIG. 13 is an elevation view showing an example of the arrangement of magnetic separators according to the present invention.

FIG. 14 is a plan view of the magnetic separator arrangement shown in FIG.

FIG. 15 is an elevation view showing a different arrangement example of the magnetic separator according to the present invention.

16 is a plan view of the magnetic separator arrangement shown in FIG.

FIG. 17 shows a perspective view of a developed example of a magnet according to the present invention.

FIG. 18 is a perspective view showing another example of development of a magnet.

FIG. 19 is a perspective view of another example in which the expansion of the magnet is different.

FIG. 20 is a perspective view showing still another example of developing the magnet.

[Explanation of symbols]

P strip cleaning process S strip T tank a1 Upper area of the same tank, that is, processing tank a2 Tank area below the same area, that is, iron powder sludge settling tank 4 Rectifier on the flow path inlet side of the treatment tank 41 Rectifier plate of the same inlet side rectifier 42 Water intake of the same rectifier 5 Rectifier on the outlet side of the flow path by the treatment tank 51 Rectifier plate of the same rectifier 52 Water outlet of the same rectifier 6 Magnetic separator 6-1 First magnetic separator 6-2 Second magnetic Separator 61 Magnetic separator sleeve 62 Rotor of the same magnetic separator 63 Magnet of the same magnetic separator 8 Purified water extraction duct 9, 11 Overflow port 10 Dirt extraction duct 13 Fiber waste removal filter

Claims (18)

[Claims] 1. A strip-cleaning wastewater of a strip pass line of the steel industry is flowed into a processing tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the strip cleaning waste water is introduced into and out of the flow path by the tank. The strip cleaning wastewater treatment method is characterized in that the iron powder sludge in the wastewater is captured and separated by a magnetic method in the flow path in the lengthwise direction by a rectifier on the side. 2. The strip cleaning wastewater of a strip pass line of the steel industry is made to flow into a treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the iron in the cleaning waste water is flowed in the flow path by the tank. A method for capturing and separating powder sludge by a magnetic separator, the magnetic separator comprising a non-magnetic sleeve vertically distributed in the treatment tank in the water region, and extending in the sleeve length direction within the sleeve. An existing roll-shaped rotor and magnets substantially arranged on the rotor peripheral surface in N and S alternately in the circumferential direction of the rotor and attached by a spiral expansion like a multi-thread screw are provided. Rotating, under the interposition of the partition wall by the sleeve,
A strip cleaning wastewater treatment method characterized in that iron powder sludge is attracted to a magnet. 3. The strip cleaning wastewater of the strip pass line of the steel industry is made to flow into a treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and this is passed through the inlet and outlet of the flow path by the tank. A method of rectifying the iron powder sludge in the cleaning wastewater in the flow channel by a rectifier on the side and capturing and separating the iron powder sludge in the cleaning wastewater by a magnetic separator, wherein the magnetic separator is vertical in the processing tank. The non-magnetic sleeve distributed in the water region in the direction of the roll, the roll-shaped rotor extending in the sleeve length direction within the sleeve, and the rotor circumferential surface having substantially N and S alternating polarities in the rotor circumferential direction. It is equipped with magnets that are arranged in parallel with each other and are attached by a spiral expansion of multiple threads, and the rotor is rotated to attract the iron powder sludge to the magnets with the interposition of the partition wall by the sleeve. Strip cleaning wastewater treatment method. 4. The strip cleaning wastewater of a strip path line of the steel industry is flown into a treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the iron powder of the cleaning waste water is flown in the flow path by the tank. A method for capturing and separating sludge by a magnetic separator, wherein the magnetic separator is a non-magnetic sleeve that is horizontally and horizontally arranged in water in the treatment tank, and a sleeve length direction in the sleeve. A rotor having a roll shape extending to the rotor, and a magnet mounted on the peripheral surface of the rotor, the polarities of which are N and S alternately arranged in the circumferential direction of the rotor and which are developed in a spiral shape like a multiple thread screw. A method of strip cleaning wastewater treatment, comprising: rotating an iron powder to attract iron powder sludge to a magnet while a partition wall is interposed by a sleeve. 5. The strip cleaning drainage of the steel industry strip pass line is made to flow into a processing tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the strip cleaning waste water is introduced into and out of the flow path by the tank. Is a method of rectifying the iron powder sludge in the cleaning wastewater by a magnetic separator in the flow passage in the length direction by a rectifier on the side, wherein the magnetic separator is water in the treatment tank. A sleeve of a non-magnetic material extending horizontally in parallel with each other in the horizontal direction, a roll-shaped rotor extending in the sleeve length direction within the sleeve, and a polarity substantially N in the rotor circumferential direction on the rotor circumferential surface. , S alternately arranged and having magnets attached by spiral expansion of multiple threads, the rotor is rotated and the iron powder sludge is attracted to the magnet under the interposition of the partition wall by the sleeve. A strip cleaning wastewater treatment method characterized by the above. 6. A strip cleaning wastewater of a strip path line of the steel industry is flowed into a treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the strip cleaning waste water is introduced into and out of the flow path by the tank. Is a method of rectifying the iron powder sludge in the cleaning wastewater by a magnetic separator in the flow passage in the length direction by a rectifier on the side, wherein the magnetic separator is water in the treatment tank. A non-magnetic sleeve that is laterally and horizontally arranged side by side in parallel with each other, a roll-shaped rotor that extends in the sleeve length direction at a position eccentrically upward in the sleeve, and a rotor circumferential surface that has substantially no polarity. It has magnets installed in a manner that N and S are alternately arranged in the circumferential direction of the rotor, and the rotor is rotated to attract the iron powder sludge to the magnet while the partition wall is interposed by the sleeve. And a strip cleaning wastewater treatment method. 7. A strip cleaning wastewater of a strip pass line of the steel industry is made to flow into a processing tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the strip cleaning waste water is introduced into and out of the flow path by the tank. Side is rectified by a rectifier in the length direction of the flow path, and in the flow path, the iron powder sludge in the cleaning waste water is provided above and below the flow path in the first magnetic separator and the second magnetic separator.
The magnetic separator of claim 1, wherein the first magnetic separator is a non-magnetic sleeve that is vertically distributed in the water tank in the processing tank, and extends in the sleeve length direction in the sleeve. An existing roll-shaped rotor and magnets substantially arranged on the rotor peripheral surface in N and S alternately in the circumferential direction of the rotor and attached by a spiral expansion like a multi-thread screw are provided. The second magnetic separator rotates to attract iron powder sludge to a magnet under the interposition of a partition wall by a sleeve. The second magnetic separator is a non-magnetic material that is horizontally spread side by side in water in the processing tank. , A roll-shaped rotor extending in the sleeve length direction within the sleeve, and a multi-thread screw-like spiral in which the polarities are alternately arranged in the rotor circumferential direction in N and S directions substantially in the rotor circumferential surface. Take out It has been androgynous and with the magnet,
The rotor is rotated so that iron powder sludge is attracted to the magnet under the interposition of the partition wall by the sleeve. The first magnetic separator is arranged on the upper side, and the second magnetic separator is arranged on the lower side. The strip cleaning wastewater treatment method, wherein the rotor in the first magnetic separator is rotated in a direction in which iron powder sludge on the sleeve peripheral surface of the rotor is moved downward. 8. A strip cleaning wastewater of a strip pass line of the steel industry is flowed into a treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and the strip cleaning waste water is introduced into and out of the flow path by the tank. Side is rectified by a rectifier in the length direction of the flow path, and in the flow path, the iron powder sludge in the cleaning waste water is provided above and below the flow path in the first magnetic separator and the second magnetic separator.
The magnetic separator of claim 1, wherein the first magnetic separator is a non-magnetic sleeve that is vertically distributed in the water tank in the processing tank, and extends in the sleeve length direction in the sleeve. An existing roll-shaped rotor and magnets substantially arranged on the rotor peripheral surface in N and S alternately in the circumferential direction of the rotor and attached by a spiral expansion like a multi-thread screw are provided. The second magnetic separator rotates to attract iron powder sludge to a magnet under the interposition of a partition wall by a sleeve. The second magnetic separator is a non-magnetic material that is horizontally spread side by side in water in the processing tank. Of the sleeve, a roll-shaped rotor extending in the sleeve length direction at an eccentric position in the sleeve, and a mode in which polarities are alternately arranged in the rotor circumferential direction in N and S alternately on the rotor circumferential surface. Take in deployment It has a magnet, and rotates the rotor to attract iron powder sludge to the magnet under the interposition of the partition wall by the sleeve. The first magnetic separator is arranged on the upper side, and the second magnetic separator is provided. A strip cleaning wastewater treatment method, characterized in that the device is disposed on the lower side, and the rotor in the first magnetic separator is rotated in a direction in which the iron powder sludge on the sleeve peripheral surface of the rotor is moved downward. 9. The strip cleaning wastewater treatment method according to any one of claims 1 to 8, wherein water purified by removing iron powder sludge by a magnetic separator in a channel of a treatment tank is extracted from the channel. Then, the method for strip cleaning wastewater treatment is characterized by returning to the step of cleaning the strip of the strip path line of the steel industry. 10. A treatment tank having a horizontal flow passage having an iron powder sludge settling tank at the bottom, and strip cleaning wastewater flowing through the flow passage by the treatment tank is rectified in the flow passage length direction at the flow passage inlet side. A rectifier, a rectifier that rectifies the strip cleaning wastewater in the channel length direction on the outlet side of the channel, and a magnet that is located in the channel and captures and separates iron powder sludge in the strip cleaning wastewater in the channel. A strip cleaning wastewater treatment device, wherein a separator is provided in the treatment tank. 11. A processing tank having a horizontal flow path having an iron powder sludge settling tank at the bottom is provided, and a magnetic separator is provided in the tank, and the magnetic separator is in a vertical direction in the processing tank and is located in the water area. A non-magnetic sleeve distributed, a roll-shaped rotor extending in the sleeve length direction within the sleeve, and a multi-thread screw in which the polarities are substantially N and S alternately arranged in the rotor circumferential direction on the rotor circumferential surface. I installed it by deploying a spiral like
A strip cleaning wastewater treatment device comprising a magnet for attracting iron powder sludge under the interposition of a partition wall by the sleeve. 12. A process tank having a horizontal flow path having an iron powder sludge settling tank at the bottom is provided, and strip cleaning waste water flowing through the flow path of the tank at the inlet side is provided in the process tank in the flow path length direction. A rectifier for rectifying the strip cleaning wastewater in the flow path length direction on the outlet side of the processing tank,
And a magnetic separator located in the flow path, the magnetic separator being a non-magnetic sleeve vertically distributed in the treatment tank in the water tank, and extending in the sleeve length direction in the sleeve. A roll-shaped rotor and iron powder on the peripheral surface of the rotor, in which polarities are arranged alternately in the rotor circumferential direction in the N and S alternate directions, and which are attached by a spiral-shaped expansion of a multi-thread screw A strip cleaning wastewater treatment device having a magnet for attracting sludge. 13. A treatment tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and a magnetic separator provided in the tank, the magnetic separator being horizontal in the water in the treatment tank. A non-magnetic sleeve extending in parallel with each other, a roll-shaped rotor extending in the sleeve length direction within the sleeve, and N and S alternating polarities substantially in the rotor circumferential direction on the rotor circumferential surface. A strip cleaning wastewater treatment device comprising a magnet for attracting iron powder sludge under the interposition of a partition wall by the sleeve, which is attached by a spiral development like a multi-thread screw. 14. A treatment tank having a horizontal flow passage having an iron powder sludge settling tank at the bottom, and strip cleaning waste water flowing through the flow passage by the tank at the inlet side of the treatment tank is flow passage length direction. A rectifier for rectifying the strip cleaning wastewater in the flow path length direction on the outlet side of the processing tank,
And a magnetic separator located in the flow path, wherein the magnetic separator is a non-magnetic sleeve that horizontally and horizontally extends in the processing tank in a horizontal direction, and a sleeve lengthwise direction in the sleeve. The extending roll-shaped rotor, and the polarities thereof are arranged in N and S alternately in the circumferential direction of the rotor in a circumferential direction of the rotor, and are attached by a spiral development like a multiple thread,
A strip cleaning wastewater treatment device comprising a magnet for attracting iron powder sludge while the partition wall is interposed by the sleeve. 15. A process tank having a horizontal flow path having an iron powder sludge settling tank at the bottom is provided, and strip cleaning waste water flowing through the flow path by the tank at the inlet side is provided in the process tank in the flow path length direction. A rectifier for rectifying the strip cleaning wastewater in the flow path length direction on the outlet side of the processing tank,
And a magnetic separator located in the flow path, the magnetic separator being a non-magnetic sleeve which is horizontally and horizontally arranged in water in the processing tank, and a sleeve which is eccentrically upward in the sleeve. A roll-shaped rotor extending in the length direction, and iron, which is attached to the rotor peripheral surface in such a manner that the polarities are alternately arranged N and S alternately in the rotor circumferential direction, with the interposition of the partition wall by the sleeve, iron. A strip cleaning wastewater treatment device having a magnet for attracting powder sludge. 16. A processing tank having a horizontal flow path having an iron powder sludge settling tank at the bottom is provided, and strip cleaning waste water flowing through the flow path by the tank at the inlet side is provided in the processing tank in the flow path length direction. A rectifier for rectifying the strip cleaning wastewater in the flow path length direction on the outlet side of the processing tank,
A first magnetic separator and a second magnetic separator that are vertically arranged side by side in the treatment tank, the first magnetic separator being a non-magnetic sleeve distributed vertically in the treatment tank in the water region; A roll-shaped rotor extending in the sleeve length direction in the sleeve, and mounted on the rotor circumferential surface by a spiral development like a multi-thread screw in which polarities are alternately arranged in N and S in the rotor circumferential direction. In addition, a magnet for attracting the iron powder sludge is provided under the partition of the sleeve,
The magnetic separator is a non-magnetic sleeve that horizontally and horizontally extends in water in the treatment tank, a roll-shaped rotor that extends in the sleeve length direction in the sleeve, and a rotor peripheral surface. Practically, the polarity is N in the circumferential direction of the rotor,
S The magnets for attracting iron powder sludge are provided under the interposition of the partition wall by the sleeves, which are arranged alternately and arranged by the spiral expansion of multiple threads, and the first magnetic separator is arranged on the upper side, and the second magnetic separator is arranged on the upper side. A strip cleaning wastewater treatment device, characterized in that the magnetic separator of is arranged on the lower side. 17. A processing tank having a horizontal flow path having an iron powder sludge settling tank at the bottom, and strip cleaning waste water flowing through the flow path by the tank at the inlet side of the processing tank is flow path length direction. A rectifier for rectifying the strip cleaning wastewater in the flow path length direction on the outlet side of the processing tank,
A first magnetic separator and a second magnetic separator that are vertically arranged side by side in the treatment tank, the first magnetic separator being a non-magnetic sleeve distributed vertically in the treatment tank in the water region; A roll-shaped rotor extending in the sleeve length direction in the sleeve, and mounted on the rotor circumferential surface by a spiral development like a multi-thread screw in which polarities are alternately arranged in N and S in the rotor circumferential direction. In addition, a magnet for attracting the iron powder sludge is provided under the partition of the sleeve,
The magnetic separator of (1) is a non-magnetic sleeve horizontally and horizontally arranged in water in the processing tank, the roll-shaped rotor eccentric upward in the sleeve and extending in the sleeve length direction, and The polarities are installed on the circumferential surface of the rotor in a manner such that the polarities of N and S are alternately arranged in the circumferential direction of the rotor.
A strip cleaning characterized in that a magnet for attracting iron powder sludge is provided under the presence of a partition wall by the sleeve, the first magnetic separator is arranged on the upper side, and the second magnetic separator is arranged on the lower side. Wastewater treatment equipment. 18. The strip cleaning wastewater treatment device according to claim 10, wherein water purified by removing iron powder sludge by a magnetic separator in the flow path is provided in the flow path of the processing tank. A strip cleaning wastewater treatment device, characterized in that a duct adapted to extract from the flow path is provided, and the duct is connected to a strip cleaning step of a strip path line of the steel industry.