JP2003211020A - Magnetic separator and magnetic separation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic treatment apparatus which increases working efficiency by reducing the number of times of cleaning a filter, and decreasing a tact time for separating and removing a magnetic matter from treated water, and to provide a magnetic processing method. <P>SOLUTION: The treated water containing the predetermined magnetic matter is introduced into a treated water introduction chamber 3 in a container 1 from a treated water feed port 5. The introduced treated water moves upward according to the flow rate in the treated water introduction chamber 3, arrives at the vicinity of the upper end 2A of a barrier rib 2, and receives magnetic force from a magnetic field component occurring at a B point. Then the magnetic matter in the treated water receives the magnetic force, is separated from the treated water, introduced in a magnetic matter deposition chamber 4 through a flow passage 10 defined by the barrier rib 2 and a member 9, and deposited. The treated water from which the magnetic matter is separated and removed, rises in the container 1 as it is, and discharged outside from a treated water discharge port 7. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic separation device and a magnetic separation method, and more specifically, for separating and recovering magnetic substances contained in sewage, industrial wastewater, water and sewerage as harmful substances or as recycled resources. The present invention relates to a magnetic separation device and a magnetic separation method.

[0002]

2. Description of the Related Art Due to the recent industrial development and improvement of living standards, the problem of treating industrial waste has become serious. In particular, it is an urgent need from an environmental standpoint to purify sewage discharged from various production processes, factory wastewater, water and sewerage, and the recovery of recycled resources from these wastewater. The waste water may contain a magnetic substance as a harmful substance or a resource to be regenerated. Therefore, when separating and removing such a magnetic substance from the waste water, a magnetic separation device has been conventionally used.

In the conventional magnetic separation device, various types of filters are provided inside the magnetic substance according to the characteristics of the magnetic substance to be separated and removed. For example, in order to separate and remove a magnetic substance having a small magnetic susceptibility, a cylindrical high-gradient magnetic separation filter composed of a large number of magnetic fine wires is used. A solenoid-shaped magnet is arranged outside the filter, and when a magnetic field having a predetermined strength of the filter is applied from this magnet, a large magnetic field gradient is generated around the magnetic thin wire.

Then, treated water such as waste water is introduced into the filter and flows between the magnetic fine wires. At this time, a huge magnetic force proportional to the product of the magnetic field from the magnet and the magnetic field gradient generated around the magnetic thin wire acts on the magnetic substance in the treated water. At this time, the magnetic substance is separated and removed from the waste water, is captured by the magnetic thin wire, and is deposited on the portion.

On the other hand, an open gradient type magnetic separation device for capturing and recovering the magnetic substance in the treated water inside the cylinder without using the above-mentioned magnetic fine wire has also been developed and used.

[0006]

However, in the above-described magnetic separation device, the deposited magnetic substance causes the filter to be clogged, and the pressure loss increases with time. Further, since the performance of the filter itself deteriorates, it is necessary to wash the inside of the filter to remove the deposited magnetic substance after a predetermined time has elapsed. When the number of times of cleaning the filter is increased, there is a problem that the takt time of the whole process of separating and removing the magnetic substance from the treated water is increased and the efficiency is reduced.

The present invention reduces the number of times the filter is washed,
An object of the present invention is to provide a novel magnetic treatment apparatus and magnetic treatment method in which the tact time for separating and removing the magnetic substance from the treated water is reduced and the working efficiency is increased.

[0008]

[Means for Solving the Problems] In order to achieve the above object,
The present invention is a magnetic separation device for magnetically separating and removing the magnetic substance from the treated water containing the magnetic substance, wherein a treated water inlet and a magnetic substance outlet are provided on one side of a pair of opposed bottom surfaces. And a container having a treated water outlet on the other side,
In the container, continuously extending upward from the bottom surface on the one side between the treated water inlet and the magnetic substance outlet, the container to the treated water inlet chamber and the magnetic substance deposition chamber The present invention relates to a magnetic separation device comprising a partition wall that is divided into two and a predetermined magnetic field component in the magnetic substance deposition chamber.

Further, according to the present invention, a step of introducing treated water into a treated water introducing chamber of the container from a treated water introducing port provided on one side of a pair of bottom surfaces facing each other in a predetermined container, A step of depositing a magnetic substance contained in the treated water by separating it from the treated water by a magnetic force in a magnetic substance deposition chamber separated from the treated water introducing chamber by a partition; Magnetic material,
A step of discharging to the outside from a magnetic substance discharge port provided on the one side of the container, and a treatment provided on the bottom surface of the container on the other side of the treated water from which the magnetic substance is separated and removed. And a step of discharging the water from the water discharge port to the outside.

According to the present invention, a predetermined container constituting the magnetic separation device is divided into two parts, a treated water introduction chamber and a magnetic substance deposition chamber, by a partition wall extending continuously upward from the bottom surface of the container. ing. Then, after introducing a predetermined treated water into the treated water introduction chamber, a magnetic force is applied to the treated water from the magnetic field component provided in the magnetic substance deposition chamber, the treated water,
Only the magnetic substance is separated and deposited in the magnetic substance deposition chamber. Then, the treatment from which the magnetic substance has been separated and removed is discharged from the container without passing through the magnetic substance deposition chamber.

That is, according to the present invention, the treated water introducing chamber is a chamber for magnetically separating and removing the magnetic substance in the treated water and discharging it, and the chamber for depositing the separated and removed magnetic substance. It is arranged separately from the magnetic substance deposition chamber. Therefore, even when a large amount of the magnetic substance is deposited in the magnetic substance deposition chamber, the magnetic substance can be removed for a long time without degrading the efficiency of separating and removing the magnetic substance from the treated water. It can be efficiently separated and removed from the treated water.

In a preferred embodiment of the present invention,
A water injection port is provided above the magnetic substance deposition chamber. Then, the magnetic substance deposited in the magnetic substance deposition chamber is discharged to the outside by the water injection from the water injection port. Accordingly, the magnetic substance deposited in the magnetic substance deposition chamber can be discharged more effectively and efficiently.

In another preferred aspect of the present invention, a magnetic field component that produces a magnetic force for separating and removing the magnetic substance is provided near the upper end of the partition wall. Furthermore, when the height of the partition wall from the bottom surface on the one side of the container is h, the magnetic field component is positioned within a range of 0.9 h from the upper end of the partition wall. As a result, the magnetic substance magnetically separated from the treated water can be efficiently introduced into the magnetic substance deposition chamber.

Further, in another preferred aspect of the present invention, the magnetic field component is arranged substantially orthogonal to the flow velocity of the treated water introduced into the treated water introducing chamber. As a result, a magnetic force substantially perpendicular to the flow velocity of the treated water acts, and the magnetic substance magnetically separated from the treated water can be efficiently introduced into the magnetic substance deposition chamber. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments of the invention. FIG. 1 is a schematic view showing an example of the magnetic separation device of the present invention, and FIG. 2 is a sectional view showing a case where the magnetic separation device shown in FIG. 1 is cut along the line AA.

The magnetic separation apparatus shown in FIGS. 1 and 2 continuously extends upward from a predetermined container 1 and a bottom surface 1A of the container 1, and the container 1 is provided with a treated water inlet 3 and a magnetic substance deposition chamber. Four
The partition wall 2 is divided into two parts. Bottom 1A of container 1
Is provided with a treated water inlet 5 and a magnetic substance outlet 6,
A treated water discharge port 7 is provided on the upper surface 1B of the container 1, which faces the bottom surface 1A. In addition, a predetermined member 9 is provided in the upper left portion of the container 1, and a water injection port 8 is provided so as to penetrate the member 9. In addition, the magnetic substance deposition chamber 4
A predetermined magnetic field component is applied to the left side wall portion (left side wall portion of the container 1) at a point B located at the same level as the upper end 2A of the partition wall 2.

Treated water containing a predetermined magnetic substance is introduced into the treated water introducing chamber 3 in the container 1 through the treated water introducing port 5. The introduced treated water moves upward in the treated water introducing chamber 3 according to the flow velocity thereof, reaches the vicinity of the upper end 2A of the partition wall 2 and receives the magnetic force from the magnetic field component. Then, the magnetic substance in the treated water is separated from the treated water by receiving the magnetic force, and is introduced into the magnetic substance deposition chamber 4 through the flow path 10 defined by the partition wall 2 and the member 9. Is deposited. Next, the treated water from which the magnetic substance has been separated and removed rises in the container 1 as it is and is discharged to the outside from the treated water discharge port 7.

The treated water is introduced into the container 1 through the treated water inlet 5.
By continuously introducing the magnetic substance into the treated water introducing chamber 3, the magnetic substance is continuously separated and removed, and the treated water from which the magnetic substance is separated and removed is continuously discharged from the treated water outlet 7 to the outside. The result is a continuous magnetic separation process.

On the other hand, the magnetic substance deposited in the magnetic substance deposition chamber 4 is discharged from the magnetic substance discharge port 6 to the outside. At this time, the magnetic substance can be discharged by utilizing the water injection from the water injection port 8. As a result, the magnetic substance can be discharged more effectively and efficiently.
In addition, the pouring water may contain air.

The discharge of the magnetic substance can be carried out at the same time as the introduction of the treated water and the separation and removal of the magnetic substance, but it is preferable to perform these operations after stopping these operations. If the magnetic substance is discharged at the same time when the treated water is introduced and the magnetic substance is separated and removed, since a predetermined magnetic field component exists at the point B, the magnetic substance deposited in the vicinity is discharged to the outside. In some cases, the flow path 10 defined by the partition wall 2 and the member 9 may be narrowed and further closed.

Therefore, as described above, the operations of introducing the treated water and separating and removing the magnetic substance are stopped,
It is preferable to discharge the magnetic substance under the condition that the magnetic field component does not exist. However, when the magnetization (magnetic susceptibility) of the magnetic substance is relatively small and is not affected by the magnetic field component so much, the operation of introducing the treated water and the separation and removal of the magnetic substance and the operation of discharging the magnetic substance are performed. You can also do and at the same time.

In FIG. 1, the magnetic field component is provided on the left side wall of the magnetic substance deposition chamber 4 at the upper end 2A of the partition 2, but the height of the partition 2 from the bottom surface 1A of the container 1 is h. In this case, it can be provided in the range from the upper end 2A of the partition wall 2 to the position of 0.9h downward. Specifically, it is appropriately determined according to the magnitude of the magnetic field component and the flow velocity of the treated water.

The magnetic field component (magnetic force) existing at point B
There is no particular limitation on the direction in which the magnetic substance is applied to the treated water as long as the magnetic substance separated and removed from the treated water can be efficiently introduced into the magnetic substance deposition chamber 4 through the channel 10. However, when a magnetic field component is provided in the vicinity of the upper end 2A of the partition wall 2 as in the point B shown in FIG. As a result, the separated and removed magnetic substance can be efficiently introduced into the magnetic substance deposition chamber 4.

The magnetic field component existing at the point B is arranged by contacting a predetermined magnet from the outside with respect to the left side wall of the magnetic substance deposition chamber 4 (the left side wall of the container 1) or at a predetermined distance. Can be generated by Further, an appropriate electromagnet or the like can be arranged in the left side wall of the magnetic substance deposition chamber 4 (the left side wall of the container 1). The magnitude of the magnetic field component is appropriately set according to the magnetization (magnetic susceptibility) and flow velocity of the magnetic substance in the treated water.

Further, the container 1 and the partition wall 2 can be made of a non-ferromagnetic or non-magnetic corrosion-resistant material such as stainless steel and glass, other ceramics, plastics or the like depending on the characteristics of the treated water. .

Further, the container 1, that is, the treated water introducing chamber 3
The size of the magnetic substance deposition chamber 4 is appropriately set according to the amount of the magnetic substance in the treated water and the amount of the treated water itself to be continuously treated. By setting the magnetic substance deposition chamber 4 to be relatively large, a large amount of magnetic substance can be deposited. Therefore, when the step of discharging the accumulated magnetic substance is performed in a state where the treated water introduction step and the magnetic separation step are stopped, the number of discharge steps can be reduced, and the takt time of the treated water magnetic separation step can be reduced. Can be reduced.

[0027]

EXAMPLE A treatment liquid containing magnetic particles A containing 0.04% by weight of magnetite and magnetic particles B containing 2.0% by weight of magnetite was introduced into the magnetic separation apparatus shown in FIG. An attempt was made to separate and remove only the magnetic particles B having a high rate from the treatment liquid. The magnetic component at the point B was set by disposing an electromagnet outside the left side wall of the magnetic component deposition chamber 4 (the left side wall of the container 1). At this time, the pole piece of the electromagnet was made parallel to the partition wall 2 so that a large local magnetic field was applied near the upper end of the partition wall 2. The specific magnitude H of the applied magnetic field was 6.8 × 10 ⁵ A / m.

Then, the treatment liquid is introduced into the treatment water introduction chamber 3 of the container 1 through the treatment water introduction port 5, and only the magnetic particles B are separated and removed from the treatment liquid and deposited in the magnetic substance deposition chamber 4. It was The degree of separation and removal of the magnetic particles B was evaluated from the ratio of the magnetic particles A in the treatment liquid discharged from the treated water discharge port 7. The results are shown in Fig. 3.

As shown in FIG. 3, the proportion of the magnetic particles A discharged from the treated water discharge port 7 decreases as the treatment liquid flow rate increases, but the magnetic particles at a proportion of about 75% or more throughout the whole. It can be seen that B is separated and removed. Also,
It can be seen that the magnetic particles B are almost completely separated and removed when the flow velocity is relatively low at 3 cm / sec.

Although the present invention has been described based on the embodiments of the present invention, the contents of the present invention are not limited to the above, and all modifications and alterations are made without departing from the scope of the present invention. Is possible.

[0031]

As described above, according to the magnetic separation apparatus and the magnetic separation method of the present invention, there is provided a treated water introducing chamber which is a chamber for magnetically separating and removing the magnetic substance in the treated water and discharging it. The magnetic substance deposition chamber, which is a chamber for depositing the separated and removed magnetic substance, is arranged separately. Therefore, even when a large amount of magnetic substance is deposited in the magnetic substance deposition chamber, the efficiency of separation and removal of the magnetic substance from the treated water is not deteriorated,
The magnetic substance can be efficiently separated and removed from the treated water for a long time.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a magnetic separation device of the present invention.

FIG. 2 is a cross-sectional view of the magnetic separation device shown in FIG. 1, taken along the line AA.

FIG. 3 is a graph showing the relationship between the flow rate of the treatment liquid and the ratio of separation and removal of magnetic particles when the magnetic separation device and the magnetic separation method of the present invention are used.

[Explanation of symbols]

1 container 2 partitions 3 Treated water introduction room 4 Magnetic material deposition chamber 5 Treated water inlet 6 Magnetic substance outlet 7 Treated water outlet 8 water inlet 9 members 10 channels 1A Bottom of container 1 1B Upper surface of container 1 2A Upper end of partition wall 2 B Existence part of magnetic field component

Claims (14)

[Claims] 1. A magnetic separation device for magnetically separating and removing the magnetic substance from the treated water containing the magnetic substance, wherein the treated water inlet and the magnetic substance outlet are provided on one side of a pair of bottom surfaces facing each other. And a container having a treated water outlet on the other side, and extending continuously upward from the bottom surface of the one side in the container between the treated water inlet and the magnetic substance outlet. A magnetic separation device, comprising: a partition that divides the container into a treatment water introduction chamber and a magnetic substance deposition chamber, and a predetermined magnetic field component in the magnetic substance deposition chamber. 2. The magnetic separation device according to claim 1, further comprising a water injection port above the magnetic substance deposition chamber. 3. The magnetic separation device according to claim 1, wherein the magnetic field component is provided near the upper end of the partition in the magnetic substance deposition chamber. 4. When the height of the partition wall from the bottom surface of the one side of the container is h, the magnetic field component is positioned within a range of 0.9 h from the upper end of the partition wall. The magnetic separation device according to claim 3, wherein 5. The magnetic field component is substantially orthogonal to the flow velocity of the treated water introduced into the treated water introducing chamber from the treated water introducing port of the container.
The magnetic separation device according to any one of 1. 6. The magnetic separation apparatus according to claim 1, wherein a rate of separation and removal of the magnetic substance from the treated water is 75% or more. 7. A first step of introducing treated water into a treated water introduction chamber of the container from a treated water introduction port provided on one side of a pair of bottom surfaces of a given container, which face each other, A second step of separating a magnetic substance contained in the treated water from the treated water by a magnetic force and depositing it in a magnetic substance deposition chamber separated from the treated water introducing chamber by a partition; and depositing in the magnetic substance deposition chamber The third step of discharging the magnetic substance to the outside from the magnetic substance discharge port provided on the one side of the container, and the treated water from which the magnetic substance is separated and removed, A fourth step of discharging the treated water to the outside through a treated water discharge port provided on the bottom surface of the magnetic separation method. 8. The magnetic substance deposited in the magnetic substance deposition chamber is discharged to the outside from the magnetic substance discharge port by water injection from a water injection port provided above the magnetic substance deposition chamber. The magnetic separation method according to claim 7. 9. The magnetic force is applied to the treated water near the upper end of the partition wall.
Or the magnetic separation method according to item 8. 10. The magnetic force is applied to the treated water in the range of 0.9 h from the upper end of the partition wall, where h is the height of the partition wall from the bottom surface on the one side of the container. 10. Applying a voltage
The magnetic separation method described in. 11. The magnetic force is applied to the treated water substantially orthogonal to the flow velocity of the treated water introduced into the treated water introducing chamber from the treated water introducing port of the container. The magnetic separation method according to claim 7. 12. The magnetic separation method according to claim 7, wherein the third step is performed in a state where the first step and the second step are stopped. . 13. The magnetic separation method according to claim 7, wherein the third step is performed simultaneously with the first step and the second step. 14. The magnetic separation method according to claim 7, wherein a ratio of separation and removal of the magnetic substance from the treated water is 75% or more.