JP2021079361A - Purifier and purification method of cleaning fluid - Google Patents

Abstract

To provide a purifier of a cleaning fluid capable of surely purifying a polluted cleaning fluid even though a matter obtained by strongly combining metal components with oil content remains in the polluted cleaning fluid.SOLUTION: A purifier of a cleaning fluid includes a liquid atomization device 3 for atomizing a molecule group of a liquid by circulating a polluted cleaning fluid polluted by cleaning a metal processed article, a centrifuge 4 for performing centrifugal separation treatment of a cleaning fluid obtained by atomizing a molecule group by the liquid atomization device 3 to recover and remove metal sludge in the cleaning fluid, and a floating oil recovery device 5 for performing floating recovery of the oil content in the cleaning fluid treated by the centrifuge 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cleaning liquid purification device and a purification method particularly suitable for purifying a cleaning liquid used for cleaning aluminum processed products.

When manufacturing a processed metal product (product), generally, the product is processed (processing process), the processed product is washed (cleaning process), the cleaned product is inspected (inspection process), and then shipped. In the cleaning process, the product is washed with a cleaning liquid, and the cleaning liquid used for cleaning and polluted is circulated after being purified. Therefore, a technique for purifying a pollutant cleaning liquid has been developed.

As a general method for purifying a pollutant cleaning liquid, the pollutant cleaning liquid collected in a dirty tank is taken out from the dirty tank, passed through a bug filter to be purified, and then collected in a clean tank. After that, the purified cleaning liquid is sucked by a jet pump and discharged from a nozzle to clean the product, and the polluted cleaning liquid is collected in a dirty tank.

However, simply passing the pollutant cleaning liquid through the bag filter leaves sludge and oil in the pollutant cleaning liquid, and the pollutant cleaning liquid cannot be sufficiently purified. Focusing on this point, Patent Document 1 discloses a technique for purifying a polluted cleaning liquid by separating oil and water in a liquid storage tank and removing floating sludge with a centrifuge to purify the polluted cleaning liquid used for cleaning. ing.

Jikken Sho 58-8398 Gazette

However, the metal component and the oil component may be strongly bonded by an intermolecular bond. In particular, in the cleaning liquid after cleaning the processed aluminum product (processed aluminum product), the aluminum component and the oil component tend to be strongly bonded (intermolecular bond). Such a tightly bonded metal component and oil may not be sufficiently separated by a centrifuge because the specific density is close to that of the water content of the cleaning liquid and the metal component and the oil content are suspended in the cleaning liquid.

The present invention has been devised in view of such a problem, so that the pollutant cleaning liquid can be reliably purified even if the metal component and the oil are strongly bonded to each other and remain in the pollutant cleaning liquid. It is an object of the present invention to provide a purification device and a purification method for the cleaning liquid.

The cleaning liquid purification device of the present invention is a liquid micronization device that purifies a metal processed product and distributes a polluted polluted cleaning liquid to miniaturize a liquid molecular group, and the liquid micronization device that miniaturizes the molecular group. A centrifuge that centrifuges the cleaned liquid to collect and removes metal sludge in the cleaning liquid, and a floating oil recovery device that floats and collects oil in the cleaning liquid treated by the centrifuge. It is characterized by being.
The liquid micronization device is arranged on the upstream side of the flow path through which the pollutant cleaning liquid flows and is equipped with a plurality of metal meshes, and on the downstream side of the metal mesh layer of the flow path. It has a processing container in which a ceramic ball layer provided with a plurality of ceramic balls is arranged, and a cleaning liquid pumping device for passing the polluted cleaning liquid through the processing container at a predetermined pressure or higher and a predetermined speed or higher. It is preferable to have.
It is preferable that a bug filter for primary treatment of the pollutant cleaning liquid is arranged on the upstream side of the liquid miniaturization apparatus.
Further, a purification cleaning liquid tank for storing the purification cleaning liquid processed by the floating oil recovery device and the pollution cleaning liquid that has been polluted by cleaning the metal processed product using the purification cleaning liquid in the purification cleaning liquid tank are stored. It is preferable that a pollutant cleaning liquid tank is provided and a circulation route for the cleaning liquid is formed.

The cleaning liquid purification method of the present invention includes a liquid micronization step of cleaning a metal processed product and distributing a polluted cleaning liquid to a liquid micronization device to miniaturize a liquid molecular group, and a molecular group by the liquid micronization step. A centrifugal separation step of centrifuging the finely divided cleaning liquid to recover and remove metal sludge in the cleaning liquid, and a floating oil recovery step of floating and recovering the oil content in the cleaning liquid treated by the centrifugation step. It is characterized by having.

According to the present invention, even if a material in which a metal component and an oil are strongly bonded remains in the pollutant cleaning liquid, the bond between the metal component and the oil is efficiently separated and the polluted cleaning liquid is reliably purified. Can be done.

It is a block diagram which shows the structure of the purification apparatus of the cleaning liquid which concerns on one Embodiment. It is a figure which shows the liquid miniaturization apparatus of the cleaning liquid purification apparatus which concerns on one Embodiment, (a) is the whole block diagram, (b) is the sectional view which shows the structure in the processing container. It is sectional drawing which shows the structure of the centrifuge of the purification apparatus of the cleaning liquid which concerns on one Embodiment. It is sectional drawing which shows the structure of the floating oil recovery apparatus of the purification apparatus of the cleaning liquid which concerns on one Embodiment.

Hereinafter, embodiments of a cleaning liquid purification device and a cleaning liquid purification method according to the present invention will be described with reference to the drawings. It should be noted that the embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Such an embodiment can be partially used, partially modified, or replaced with another mechanism or device having the same function.

[Overall configuration of cleaning liquid purification device]
The cleaning liquid purification device according to the present embodiment is used between a processing process for processing a product and an inspection process for inspecting the product when manufacturing a metal processed product (hereinafter, also referred to as a product) such as an aluminum processed product. It is used in the cleaning process for cleaning processed products, and is used to clean metal processed products to purify polluted polluted cleaning liquids so that they can be reused. The cleaning liquid is, for example, a solution in which a required cleaning agent is dissolved in water.

As shown in FIG. 1, the purification device 10 includes a pollutant cleaning liquid tank (also referred to as a dirty tank) 1, a bag filter 2, a liquid miniaturization device (also referred to as a fine water device) 3, a centrifuge 4. The floating oil recovery device 5 and the purification cleaning liquid tank (also referred to as a clean tank) 6 are arranged in this order from the upstream side to the downstream side of the cleaning liquid treatment path 9, and a cleaning liquid circulation path is formed. There is. In FIG. 1, the cleaning liquid treatment path 9 in the purification device 10 from the dirty tank 1 to the clean tank 6 is indicated by a thick arrow.

The purifying cleaning liquid stored in the clean tank 6 is sucked up by the jet pump 7 and injected from the cleaning nozzle 8 toward the product to be used for cleaning the product.
The purifying cleaning liquid used for cleaning becomes polluted by being mixed with metal debris such as oil and metal burrs that adhered during metal processing of the product. This polluted cleaning liquid (polluted cleaning liquid) is collected in the dirty tank 1 and processed by the present purification device 10.
In FIG. 1, the moving path 11 of the cleaning liquid for cleaning the product from the clean tank 6 to the dirty tank 1 is indicated by a thin arrow.
Hereinafter, the main configuration of the purification device 10 will be described.

[Bug filter]
The bug filter 2 is a known one, and is provided with a filter element having a predetermined roughness (here, 10 μ), and the pollutant cleaning liquid in the dirty tank 1 is passed through the bug filter 2 to be filtered to pollute. It is possible to remove solid content of a certain size or more in the cleaning liquid. The processing by this bug filter 2 is called primary processing.

[Liquid miniaturization device]
The liquid miniaturization device 3 is a known one, and as shown in FIG. 2, a pump that sucks the processing container 30, the upstream tank 31, and the pollutant cleaning liquid in the upstream tank 31 and pumps them to the processing container 30. A (cleaning liquid pumping device) 32 and a downstream tank 33 for temporarily storing the cleaning liquid treated in the processing container 30 are provided. The pollutant cleaning liquid in the upstream tank 31 is a primary treatment of the pollutant cleaning liquid in the dirty tank 1 with the bug filter 2.

In the processing container 30, a metal mesh layer 34 arranged on the upstream side of the flow path 30a through which the pollutant cleaning liquid flows and equipped with a plurality of metal meshes (here, a mesh made of stainless steel (SUS)), and a metal mesh layer 34. A ceramic ball layer 35, which is arranged on the downstream side of the metal mesh layer 34 of the flow path 30a and is equipped with a plurality of ceramic balls, is installed.

When the liquid is passed through the processing container 30 with a pressure and speed above a certain level by pumping by the pump 32, cavitation and Coanda effect are repeatedly generated around the SUS mesh and the ceramic balls when the liquid passes, and as a result, the cavitation and the Coanda effect are repeatedly generated. As a result, a large amount of nanobubbles (nanolevel bubbles) are generated in the liquid. It should be noted that the nanobubbles generated by this device have the property of staying in the liquid for a longer time than the normal nanobubbles of the method of forcibly dissolving air in the liquid and exerting an effect.

The nanobubbles generated in this way exert the effect of refining the molecular population of the liquid. It is considered that this is because the ceramic ball is excited to generate a weak potential having a special wavelength, and the separation of intermolecular bonds is promoted. For example, when water as a liquid is circulated in the processing container 30 to generate nanobubbles, the molecular population of water is refined. Therefore, the liquid miniaturization device 3 is also referred to as a fine water device.

Sludge and oil that could not be removed by the bag filter 2 remain in the pollutant cleaning liquid treated by the liquid miniaturization apparatus 3, and the metal component and the oil are firmly bonded (intermolecular bond) in the sludge. There is something that remains in the state. In particular, the aluminum component and the oil tend to be more strongly bonded by intermolecular binding. If the metal component and the oil are strongly bonded, they cannot be easily decomposed, which hinders the purification of the pollutant cleaning liquid.

The liquid miniaturization device 3 also has an action of separating such a metal component and an oil component. It is considered that this is because the ceramic ball is excited to generate a weak potential having a special wavelength in the same manner as described above, and the separation of the intermolecular bond is promoted. When the metal component and the oil component are separated, the metal component can be separated and recovered from the pollutant cleaning solution by centrifugation, and the oil component in the pollutant cleaning solution can be separated and recovered by floating recovery.

〔centrifuge〕
The centrifuge 4 is a known one, and as shown in FIG. 3, the centrifuge 4 includes a substantially cylindrical and vertically long processing container 40. A swivel chamber 41 having an enlarged diameter is provided in the upper part of the processing container 40, and a liquid (here, treated by the liquid miniaturizing device 3) is provided on the outer periphery of the swirl chamber 41 at a position eccentric from the axis of the swivel chamber 41. An inlet portion 42 for pumping the cleaning liquid) at high speed is provided. As a result, in the swirl chamber 41, the supplied liquid swirls at high speed, and the liquid (moisture and oil) and the solid content such as metal sludge having a large specific gravity with respect to the liquid are separated. ..

A settling space 43, which is a space for solids to settle, is provided in the middle portion in the vertical direction of the processing container 40, and a space for solids to settle is provided in the lower part of the processing container 40 below the settling space 43. A settling chamber 44 is provided.
Further, a lower collection outlet 45 for collecting the solid content settled in the settling chamber 44 is provided at the lower end of the processing container 40, and a liquid from which the solid content has been removed in the swirl chamber 41 is provided at the upper end of the processing container 40. An upper collection port 46 for collecting components (moisture and oil) is provided.
By introducing the cleaning liquid treated by the liquid miniaturizing device 3 into the centrifuge 4 in this way, solid content such as metal sludge can be removed from the cleaning liquid.

[Floating oil recovery device]
The floating oil recovery device 5 is a known one, and as shown in FIG. 4, a processing tank 51 in which a cleaning liquid [a liquid component from which solids have been removed (moisture and oil)] is stored, and a processing tank 51 in the processing tank 51. An oil recovery duct 52 in which a recovery port 52a is arranged near the liquid level in the cleaning liquid, and a suction pump 53 connected to the oil recovery duct 52 and sucking and recovering oil floating near the liquid level in the cleaning liquid from the recovery port 52a. It is provided with an oil recovery tank 54 for storing the recovered oil. The oil recovery duct 52 is flexible, and the recovery port 52a is equipped with a float 52b so that the recovery port 52a is always located directly below the liquid level of the cleaning liquid.

Further, the cleaning liquid suction duct 55 in which the suction port 55a is arranged near the bottom of the processing container 51 and the cleaning liquid whose oil content is separated in the processing container 51 are sucked from the suction port 55a connected to the cleaning liquid suction duct 55. It includes a suction pump 56 and a recovery tank 57 in which the sucked cleaning liquid is stored. A clean tank 6 may be directly used for the recovery tank 57.
In this way, the floating oil recovery device 5 separates the oil component of the liquid component of the cleaning liquid and recovers the remaining water (including the cleaning agent).

[Action and effect]
Since the cleaning liquid purifying device 10 according to the present embodiment is configured as described above, oil and metal sludge are added to the polluted cleaning liquid (that is, the cleaning liquid (water containing a cleaning agent)) that has been polluted by cleaning the metal processed product. By circulating the liquid containing a fixed amount such as, etc., the cleaning liquid can be reliably purified and reused (effect 1).

That is, by passing the pollutant cleaning liquid through the bag filter 2 and filtering it, solid content having a certain size or larger in the pollutant cleaning liquid is removed (primary treatment). At this stage, the primary-treated cleaning liquid contains fine-sized solids (metal sludge) in the liquid component consisting of water and oil. Further, in the solid content, a bond remaining in a state where the metal component and the oil component are strongly bonded (intermolecular bond) (in particular, a bond in which the aluminum component and the oil component are more strongly bonded by the intermolecular bond). ) Is included.

Next, the primary-treated cleaning liquid is circulated to the liquid miniaturization apparatus 3 to miniaturize the molecular group of the liquid (liquid miniaturization step). That is, the liquid micronizing device 3 has a processing container 30 in which a metal mesh layer 34 having a SUS mesh and a ceramic ball layer 35 having ceramic balls are contained, and a cleaning liquid pumping device 32, and is therefore constant. When the liquid is passed through the processing container 30 with the above pressure and speed, cavitation and coranda effects are repeatedly generated around the SUS mesh and the ceramic balls when the liquid passes, and as a result, a large amount of nanobubbles are generated in the liquid. Occurs. The nanobubbles generated in the liquid by the liquid miniaturizing device 3 separate the bonds between the liquids in the cleaning liquid and between the molecules of the liquid and the solid. Thereby, the bond (particularly, the bond between the aluminum component and the oil) remaining in the state where the metal component and the oil are firmly bonded can be decomposed (effect 2).

Next, the cleaning liquid in which the combination of the metal component and the oil is decomposed in the liquid miniaturization step is centrifuged by the centrifuge 4 to collect and remove the metal sludge in the cleaning liquid (centrifuge step).
In the centrifugation step, solids (metal sludge) such as metal sludge are removed from the cleaning liquid. The specific gravity of the combination of the metal component and the oil is close to that of water, and it is difficult to separate the metal component of this combination from the cleaning liquid (water containing a detergent) only by centrifugation. This does not happen because the combination of the metal component and the oil is decomposed in advance.

Next, the oil content in the cleaning liquid treated by the centrifugation step is floated and recovered by the floating oil recovery device 5 (floating oil recovery step).
In the floating oil recovery step, oil is removed from the cleaning liquid. The specific gravity of the combination of the metal component and the oil is close to that of water, and it is difficult to separate the combination from the cleaning liquid (water containing a cleaning agent) by static specific gravity separation such as floating oil recovery. This is not the case because the combination of the metal component and the oil is decomposed in advance in the apparatus.

In this way, according to the cleaning liquid purifying device or the cleaning liquid purification method according to the present embodiment, the combined metal component and oil content, including the combined aluminum component and oil component, remains in the polluted cleaning liquid. Even so, the liquid micronizer 3 (liquid micronization step) can separate the bond between the metal component and the oil and decompose the bond, so the subsequent centrifuge 4 (centrifuge step) floats. The pollutant cleaning liquid can be reliably purified by the oil recovery device 5 (floating oil recovery step).

Further, in the present embodiment, the bag filter 2 is arranged on the upstream side of the liquid miniaturization device 3, and the pollutant cleaning liquid is passed through the bag filter 2 and filtered to remove solid content of a certain size or more in the pollutant cleaning liquid. Since it is removed (primary treatment) and then processed by the liquid miniaturization device 3, the liquid miniaturization device 3 can efficiently decompose the conjugate (effect 3).

Further, a purification cleaning liquid tank 6 for storing the purification cleaning liquid processed by the floating oil recovery device 5, and a pollution cleaning liquid for storing the polluted cleaning liquid which is polluted by cleaning the metal processed product using the purification cleaning liquid in the purification cleaning liquid tank 6. A tank 1 is provided, and a cleaning liquid circulation path is provided from the pollutant cleaning liquid tank 1, the bag filter 2, the liquid miniaturization device 3, the centrifuge 4, the floating oil recovery device 5, and the purification cleaning liquid tank 6. Since it is formed, it can be used continuously while circulating the cleaning liquid (effect 4).

[Other]
Although the embodiments of the present invention have been described above, the present invention can be implemented by variously modifying such embodiments without departing from the spirit of the present invention.
For example, the liquid miniaturization device 3, the centrifuge 4, and the floating oil recovery device 5 described in the above embodiment are examples, and various devices can be applied as long as they have the respective functions. In particular, the liquid micronizing device 3 miniaturizes a liquid molecular group, that is, a bond between liquid molecules or between a liquid molecule and a solid molecule (particularly, a molecule between a metal component and an oil contained in a pollutant cleaning liquid). Anything that can separate the bond) will do.

1 Pollution cleaning liquid tank (dirty tank)
2 Bug filter 3 Liquid miniaturization device (fine water device)
4 Centrifuge 5 Floating oil recovery device 6 Purifying and cleaning liquid tank (clean tank)
7 Jet pump 8 Cleaning nozzle 9 Cleaning liquid processing route 10 Cleaning liquid purification device 11 Cleaning liquid movement route 30 Processing container 30a Cleaning liquid flow path 31 Upstream tank 32 Pump (cleaning liquid pumping device)
33 Downstream tank 34 Metal mesh layer 35 Ceramic ball layer

Claims (5)

A liquid miniaturization device that miniaturizes a molecular group of liquids by cleaning metal processed products and distributing a polluted cleaning liquid.
A centrifuge that collects and removes metal sludge in the cleaning liquid by centrifuging the cleaning liquid whose molecular population has been refined by the liquid micronizing device.
A cleaning liquid purification device including a floating oil recovery device that floats and recovers oil in the cleaning liquid processed by the centrifuge. The liquid miniaturization device is
A metal mesh layer arranged on the upstream side of the flow path through which the pollutant cleaning liquid flows and equipped with a plurality of metal meshes, and a plurality of ceramic balls arranged on the downstream side of the metal mesh layer of the flow path. A processing container with an equipped ceramic ball layer and
The cleaning liquid purification device according to claim 1, further comprising a cleaning liquid pressure feeding device for passing the polluted cleaning liquid through the processing container at a predetermined pressure or higher and a predetermined speed or higher. The cleaning liquid purification device according to claim 1 or 2, wherein a bug filter for primary treatment of the polluted cleaning liquid is arranged on the upstream side of the liquid miniaturization device. A purification and cleaning liquid tank for storing the purification and cleaning liquid processed by the floating oil recovery device, and
A pollutant cleaning liquid tank for storing the polluted cleaning liquid that has been polluted by cleaning the metal processed product using the purifying cleaning liquid in the purifying cleaning liquid tank is provided.
The cleaning liquid purification device according to any one of claims 1 to 3, wherein a circulation route for the cleaning liquid is formed. A liquid miniaturization process in which a metal processed product is washed and a polluted cleaning liquid is distributed to a liquid miniaturization device to miniaturize a molecular group of the liquid.
A centrifugal separation step of centrifuging a cleaning liquid whose molecular population has been refined by the liquid refining step to collect and remove metal sludge in the cleaning liquid.
A method for purifying a cleaning liquid, which comprises a floating oil recovery step for floating and recovering oil in the cleaning liquid treated by the centrifugation step.

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