JP2000229204A - Treatment method of oil-water mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the maintenance cost of an equipment and the waste cost of an oil water mixed solution and to eliminate the generation of environmental problems by recovering the oil water mixed solution to store in a settling tank, separating the solution into an oil component and a water component to respectively place in each of the upper and the lower layer and successively recovering the oil component and the water component. SOLUTION: A spent mold lubricant is recovered from a press device 1 to a recovering tank 4 through a shoot 2. The recovered mold lubricant is stored in each of settling tanks 5, 6 in a settled state and hydraulic oil and the mold lubricant are separated and placed respectively in the upper layer and the lower layer corresponding to the difference of each specific gravity. The hydraulic oil is recovered from the upper layer to be stored in an oil recovering tank 7 and the mold lubricant is recovered from the lower layer to be supplied to the bottom of an oil water separation tank 9. The hydraulic oil is coagulated in the upper layer of the oil water separation tank 9 to be recovered in a waste oil drum 8 and the mold lubricant is gathered in the bottom to be supplied to a supply tank 10 and is supplied to the press device 1 through a filter device 11 after supplied to the supply tank 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for treating an oil-water mixture.

[0002]

2. Description of the Related Art An oil-water mixture, for example, a mold lubricating liquid used for lubricating a mold in a press machine contains a mold lubricant as a water component, and also drives a scale such as iron powder and a press machine. Hydraulic oil as an oil component that leaks from the hydraulic device. If the mold lubricating liquid mixed with the scale and the working oil is reused as it is, the life of the mold in the press machine becomes extremely short, and the quality of the product is not stable. For this reason, it is conceivable to remove scale and hydraulic oil from the used mold lubricant in order to reuse the used mold lubricant. However, it has been relatively difficult to remove these almost completely in the past. Was. In particular, it has been extremely difficult to remove the mixed amount of hydraulic oil to the extent that it can be reused. For this reason, in general, the mold lubricating fluid is hardly reused, and only the replenishment of the used mold lubricating fluid with a new mold lubricant is performed.

[0003]

However, if the used mold lubricant is not reused, a relatively expensive new mold lubricant must be replenished in a large amount, which ultimately increases the manufacturing cost. Will be invited. Further, in such a case, it becomes necessary to discard a large amount of used mold lubricant when it becomes too late to replenish new mold lubricant, thereby causing disposal cost problems and environmental problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional situation, and has been made to reduce the maintenance cost of equipment using an oil / water mixture, to dispose of the oil / water mixture, and to produce an oil / water mixture which does not cause environmental problems. An object of the present invention is to provide a method for treating a liquid.

[0005]

According to the present invention, there is provided a method of treating an oil-water mixture, comprising: a recovery step of recovering an oil-water mixture obtained by mixing an oil component and a water component; A sedimentation step of storing the oil component as an upper layer in the sedimentation tank and positioning the water component as a lower layer in the sedimentation tank; and an oil component for recovering the oil component from the upper layer. A water component recovering step of recovering the water component from the lower layer.

In the method for treating an oil / water mixture according to the present invention, first, in a recovery step, an oil / water mixture obtained by mixing an oil component and a water component is recovered. Then, in the settling step, the collected oil-water mixture is stored in a settled tank in a settled state. Thus, due to the difference in specific gravity, the oil component is positioned as the upper layer in the calming tank, and the water component is positioned as the lower layer in the calming tank. Thereafter, the oil component is collected from the upper layer in an oil component collection step, and the water component is collected from the lower layer in a water component collection step.

Thus, in the method for treating an oil-water mixture according to the present invention, a used oil-water mixture can be separated into an oil component and a water component and reused. Therefore, it is sufficient to replenish a small amount of new water component or oil component, and even if the water component or oil component is relatively expensive, the maintenance cost of using the oil-water mixture can be reduced. In addition, since it is sufficient to replenish the new water component or oil component, it is not necessary to discard a large amount of the used oil-water mixture, so that there is no problem of disposal cost and no environmental problem.

It is preferable to use a plurality of settling tanks for one oil-water mixed liquid recovery path. In such a case, the settling process, the oil component collecting process, and / or the water component collecting process are performed in one settling tank, and the settling process, the oil component collecting process, and / or the water component collecting process are performed in another settling tank. Can increase the effect of calming,
Waste of time can be eliminated.

In the oil component recovery step, a belt circulating endlessly between the upper layer and the outside air above the upper layer;
A circulation type recovery device having a scraper for scraping off oil components attached to the belt from the belt in the outside air can be used. The oil component having a low specific gravity is located in the upper layer of the settling tank, and this oil component is easily recovered at a high concentration by such a circulation type recovery device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

The method for treating an oil-water mixture according to the embodiment is shown in FIG.
As shown in FIG. The mold lubricating liquid recycling system provided integrally with the press device 1 provided at L is used.

In this recycling system, a chute 2 extends from the lower part of the press device 1 to the upper part of the collection tank 4.
Is suspended. The recovery tank 4 is installed in the underground pit together with the first and second settling tanks 5 and 6 and the oil recovery tank 7.

A collection pump 4c is provided at the bottom of the collection tank 4.
The recovery pump 4 c is connected to a pipe 31, and a pipe 32 connected to the pipe 31 has a floor F. L
Is connected to the magnet separator 20 provided above. A magnetic drum 20 a is rotatably provided above the magnet separator 20.
A scraper 20b faces the scale carriage 21 at 0a. Further, a pipe 33 is connected to a lower portion of the magnet separator 20, and a pipe 34 connected to the pipe 33 is provided with a motor valve 20c. Downstream of the motor valve 20c, a motor valve 20d,
The pipes 35, 36 having 20e are connected, and the pipes 35, 3
Reference numeral 6 extends to the inner surface of the chute 2.

As shown in FIG. 2, a pipe 37 is connected to an upper portion of the collection tank 4, and pipes 38 and 39 having solenoid valves 4a and 4b are provided downstream of the pipe 37.
Are connected, and the pipes 38 and 39 extend into the first and second settling tanks 5 and 6, respectively.

As shown in FIG. 3, the first settling tank 5 is provided with a circulation type recovery device 15. The circulation-type recovery device 15 is driven by a first pulley 15a driven by a motor (not shown) in the outside air above an upper layer of the oil-water mixture stored in the first settling tank 5 and a second pulley driven by the upper layer of the oil-water mixture. A second pulley 15b, a belt 15c wound around the first and second pulleys 15a and 15b,
Oil recovery plate 7 facing belt 15c in the outside air
and a scraper 15d extending to a. The second settling tank 6 is also provided with a circulating recovery device 16, which is similar to the first pulley 16 a and the second pulley 16 a.
It is composed of a pulley 16b, a belt 16c, and a scraper 16d.

The oil recovery plate 7a is capable of dropping oil components collected in the oil recovery tank 7. The oil recovery plate 7a has an oil recovery pump 7b and a valve 8a at the bottom of the oil recovery tank 7, and has a floor F. A pipe 40 extending to the waste oil drum 8 provided at L is provided.

As shown in FIG. 4, a pipe 41 having an electromagnetic valve 5a is provided at a position 200 mm from the bottom of the first calming tank 5 and at a position 200 mm from the bottom of the second calming tank 6. A pipe 42 having an electromagnetic valve 6a is also provided.
It is connected to a pipe 43 having d. The pipe 43 is a floor F.
L is connected to the bottom of the oil / water separation tank 9 provided.

The interior of the oil / water separation tank 9 is partitioned into a first chamber 9d and a second chamber 9e by a partition 9b having an open bottom.
In the chamber 9d, a plurality of perforated plates 9a provided with a large number of holes having a diameter of 7 to 8 mm are provided horizontally. A pipe 44 extending to the waste oil drum 8 is connected to an upper end of the first chamber 9d, and a pipe 45 having a drain valve 9c and extending to the first calming tank 5 is connected to a lower part of the first chamber 9d. Have been. On the other hand, a pipe 46 extending to the supply tank 10 is connected to the upper end of the second chamber 9e.

As shown in FIG. 1, a supply tank 10 and a filter device 11 are installed in the middle pit. In the supply tank 10, as shown in FIG.
Is provided. A pipe 45 having a drain valve 10b and extending to the inner surface of the chute 2 is connected to a lower portion of the supply tank 10, and a pipe 47 connected to a pipe 46 is connected to an upper end of the supply tank 10. A filter device 11 having a built-in circulation pump 11 a is connected to the supply tank 10 by pipings 48 and 49.

Further, as shown in FIG. Above L, a new liquid supply device 12 is provided, and this new liquid supply device 12 is connected to a pipe 50 having an electromagnetic valve 12a and valves 12b to 12d as shown in FIG. The pipe 50 has a valve 12 e and is connected to a pipe 51 connected to the supply tank 10.
f, 12 g. Piping 52
Has a pipe 5 with a valve 12h between it and the supply tank 10.
3 is also connected. In addition, the pipe 52 is provided with a valve 1
Three types of supply pumps 1a having b and 1c are connected in parallel, and a press device 1 is provided downstream of these.

In the recycle system according to the embodiment, similar devices and pipes are connected to the magnet separator 2.
0 is also connected to the other side. In addition, collection tank 4,
The first and second settling tanks 5 and 6, the oil recovery tank 7 and the supply tank 10 are provided with sensors for detecting respective liquid levels, and each sensor is connected to a control panel.

In the recycling system configured as described above, first, as shown in FIG. 1, used mold lubricating liquid is collected from the press device 1 through the chute 2 to the collection tank 4 as a collecting step. The mold lubricant contains a mold lubricant as a water component as well as a scale such as iron powder, and hydraulic oil as an oil component leaked from a hydraulic device that drives the press device 1.

The mold lubricating liquid is collected in the recovery tank 4 due to the difference in specific gravity.
The scale is settled to the bottom in the tank, and the recovery pump 4c is operated in a cycle determined by the amount of the mold lubricant sprayed onto the press device 1 and the capacity of the recovery tank 4, specifically, once every 30 minutes. Then, the lubricating liquid containing a large amount of sedimented scale is sent to the magnet separator 20 via the pipe 32 by the recovery pump 4c. In the magnet separator 20, the scale magnetized by the magnetic drum 20a is scraped off on the scale carriage 21 by the scraper 20b. Since the scale cart 21 is a colander receiver and can reduce the water content of the scale, the collected scale can be sold. The mold lubricant whose scale has been separated and removed by the magnet separator 20 is supplied to the pipes 34, 35, 36 and the motor valves 20c, 20d, 2c.
After 0e, the chute 2 is washed. At this time, the time for one scale collection is relatively long, such as 30 minutes. As a result, a later-described settling step and the like are performed over a long period of time to improve the oil-water separation state.

Then, as a settling step, the collected mold lubricant is settled in a first settling tank 5 or a second settling tank 6.
Store inside. At this time, as shown in FIG. 2, due to the difference in specific gravity, the type lubricating liquid containing a large amount of hydraulic oil in the upper part of the recovery tank 4 stops the operation of the recovery pump 4c and has a wave on the liquid level in the recovery tank 4. Without overflowing the scale 37, the solenoid valve 4a overflows into the pipe 37 with almost no scale.
By opening one of 4b, it is sent to one of the first and second settling tanks 5 and 6 via the pipe 38 or the pipe 39. Thus, in any of the first and second calming tanks 5 and 6,
Due to the difference in specific gravity, the hydraulic oil is positioned as the upper layer and the mold lubricant is positioned as the lower layer.

Thereafter, as an oil component recovery step, hydraulic oil is recovered from the upper layer. At this time, as shown in FIG. 3, the hydraulic oil having a low specific gravity, which is located in the upper layer of the first calming tank 5 or the second calming tank 6, has a high concentration in the circulation type collecting device 15,
16 adhere to the belts 15c and 16c, and
The oil is collected on the oil collecting plate 7a by d and 16d.
The hydraulic oil on the oil recovery plate 7a is dropped into the oil recovery tank 7. When the level of the hydraulic oil in the oil recovery tank 7 reaches the H level, the hydraulic oil is recovered to the waste oil drum via the pipe 40, the oil recovery pump 7b, and the valve 8a. At this time, the state of recovery of the hydraulic oil is grasped by an operation counter (not shown) of the oil recovery pump 7b. Thereby, the belt 15c,
A failure of the oil recovery tank 16c, an oil leak of the oil recovery tank 7, and the like can be found at an early stage, and the maintainability can be improved.
When the liquid level of the waste oil drum 8 reaches the H level,
An operator manually closes the valve 8a and replaces the waste oil drum 8 with an empty waste oil drum.

In the water component recovery step, a mold lubricant is recovered from the lower layer. At this time, as shown in FIG. 4, when the liquid level of one of the first calming tank 5 or the second calming tank 6 becomes H level, the first calming tank 5 or the second calming tank having the liquid level of H level In order to suck the mold lubricant from one of the solenoid valves 6, one of the solenoid valves 5a or 6a is opened, and the oil / water separation pump 9d is operated. Thereby, the mold lubricant still containing a small amount of hydraulic oil is sent from the first calming tank 5 or the second calming tank 6 to the bottom of the oil-water separation tank 9 via the pipes 41, 42, 43. At this time, since the pipes 41 and 42 suck the mold lubricant from a position 200 mm from the bottom surface of the first calming tank 5 or the second calming tank 6, the mold lubricant with a small amount of hydraulic oil mixed into the oil / water separation tank 9. Will be sent. Then, when the liquid level of one of the first calming tank 5 or the second calming tank 6 becomes L level, one of the solenoid valve 5a or the solenoid valve 6a is closed, and the liquid level of the first calming tank 5 or 5 is set to H level. The other of the solenoid valve 5a or the solenoid valve 6a is opened to suck the mold lubricant from the other of the second settling tank 6.

The mold lubricant that has entered from the bottom of the oil / water separation tank 9 still has a specific gravity smaller than that of the mold lubricant, so that the perforated plate 9a is provided in the first chamber 9d.
Aggregate due to surface tension while floating through the holes. Since this occurs in the plurality of perforated plates 9a, the oil droplets become larger as going upward, and the working oil collects in the upper layer. This hydraulic oil is collected by the waste oil drum 8 via the pipe 44.

Further, since the mold lubricant has a higher specific gravity than the hydraulic oil, the mold lubricant containing almost no hydraulic oil collects at the bottom of the oil / water separation tank 9, and the second chamber 9e contains almost all the hydraulic oil. No mold lubricant collects. This mold lubricant is sent to the supply tank 10 via the pipe 46. In this way, it is possible to reuse a mold lubricant containing substantially no scale and hydraulic oil.

Then, as shown in FIG.
Foreign matter is removed from the mold lubricant in the space between the filter device 11 and the pipe lubricants 48 and 49. The mold lubricant in the supply tank 10 is supplied to the press device 1 in a state where the pressure is adjusted via the valve 12h, the pipe 53, the valve 1b, the supply pump 1a, and the valve 1c. During this time, if the liquid level in the supply tank 10 is at the L level, the solenoid valve 12a is opened, and a new mold lubricant is supplied from the new liquid supply device 12 to the supply tank 10 via the pipes 50 and 51 and the valves 12d and 12e. You. If the liquid level of the supply tank 10 is at the H level,
The electromagnetic valve 12a is closed, and the supply of the new mold lubricant from the new liquid supply device 12 is stopped. During these, supply tank 1
The mold lubricant in 0 is agitated by the fan 10a driven by the motor 10c, so that a stable quality is obtained. When the mold lubricant in the supply tank 10 overflows, the overflowed mold lubricant is supplied to the inner surface of the chute 2 through the pipes 47 and 46, and is used for cleaning the chute 2. When the recycling system is to be stopped for a long time, the valve 10b is opened, and the mold lubricant in the supply tank 10 is supplied to the pipe 46.
After being subjected to washing of the chute 2 after passing through, the chute 2 is collected. If the liquid level of the supply tank 10 is at the LL level as in the start of the recycling system, the valves 12b, 1
2c, 12f and 12g are opened, and a new mold lubricant is supplied from the new liquid supply device 12 to the press device 1 by the supply pump 1a.

Thus, in this recycling system,
The used mold lubricating liquid can be separated and reused as scale, oil component hydraulic oil and water component mold lubricant. Therefore, it is sufficient to supply a relatively small amount of new mold lubricant in a small amount, and it is possible to reduce the maintenance cost of the press device and, consequently, the manufacturing cost. In addition, since it is sufficient to replenish the new mold lubricant and it is not necessary to dispose a large amount of used mold lubricant, there is no problem of disposal cost and no environmental problem.

In this recycling system, since the first and second calming tanks 5 and 6 are used, the calming step, the oil component collecting step and the water component collecting step are performed on one of the first and second calming tanks 5 and 6. While performing, the first and second calming tanks 5 and 6
In the other case, the settling step, the oil component collecting step, and the water component collecting step can be performed, so that the effect of the settling can be enhanced and time can be wasted.

Further, in this recycling system, since the input from each sensor is managed by the control panel, the operation of the recovery tank 4 and the like can be automated, the failure location can be easily estimated, and the maintainability is improved. ing.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a mold lubricant recycling system according to an embodiment.

FIG. 2 is a schematic configuration diagram of a part that performs a calming step according to the embodiment.

FIG. 3 is a schematic configuration diagram of a portion that performs an oil component recovery step according to the embodiment.

FIG. 4 is a schematic configuration diagram of a portion that performs a water component recovery step according to the embodiment.

FIG. 5 is a schematic configuration diagram of a portion for supplying a mold lubricant to a press device according to the embodiment.

[Explanation of symbols]

 5, 6: first and second calming tanks 15, 16: circulating collection device 15a, 16a: first pulley 15b, 16b: second pulley 15c, 16c: belt 15d, 16d: scraper

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Izumi Sakakibara 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Fumio Kawahara 7-16-1 Kakimotocho, Toyota City, Aichi Prefecture MEC International Co., Ltd. Within (72) Inventor Kiyohiko Matsuo 7-16-1, Kakimoto-cho, Toyota-shi, Aichi Pref. Inside Mec International Co., Ltd. (72) Inventor Tsutsuo Mishima 7-16-1, Kakimoto-cho, Toyota-shi, Aichi Pref.

Claims (3)

[Claims] A recovery step of recovering an oil-water mixture obtained by mixing an oil component and a water component; storing the recovered oil-water mixture in a quiet state in a quiet tank; Located as the upper layer inside
A settling step of positioning the water component as a lower layer in the settling tank; an oil component collecting step of collecting the oil component from the upper layer; and a water component collecting step of collecting the water component from the lower layer. A method for treating an oil-water mixture, characterized by the following. 2. The method for treating an oil-water mixture according to claim 1, wherein a plurality of settling tanks are used for one oil-water mixture recovery path. 3. A circulating recovery apparatus comprising: a belt circulating endlessly between an upper layer and outside air above the upper layer; and a scraper for scraping off oil components attached to the belt from the belt in the outside air. 3. The method for treating an oil-water mixture according to claim 1 or 2, wherein the oil component recovery step is performed using the oil.