JP2018058167A - Purifying device for water-soluble processing liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a purifying device for water-soluble processing liquid capable of regenerating a processing liquid for machine tool or the like to recycle by removing specific chemical substances (contaminants comprising oils, metal or water components and the like) from the processing waste liquid contaminating by such chemical substances.SOLUTION: An objective purifying device for water-soluble processing liquid comprises: an electrolytic bath 3; electrodes 3a, an agitation blade 3b and a partition plate 3c disposed in the electrolytic bath; a dirty matter treatment scraper 3d disposed at the upper part of the electrolytic bath for craping out the floating matters (contaminants); and a dirty matter treatment tank 5 collecting the floating matters craped out by the scraper. The dirty matter treatment tank comprises a can 6 for collecting oils and a dirty matter-receiving tank 7. Besides, the electrolytic bath is equipped with a circulation tank 1 for storing an electrolytically purified liquid and recirculating in that bath.SELECTED DRAWING: Figure 1

Description

  The present invention mainly removes chemical substances (contaminants made up of oil, metal components, water components, etc.) from processing waste liquid mixed with chemical substances, such as machining fluid for machine tools, and regenerates the processing liquid. The present invention relates to a water-soluble processing liquid purification device that can be used in a circulating manner.

  The detoxification treatment of processing waste liquids (waste liquids and wastewater mixed with chemical substances) from machine tools is one of the most important urgent issues for global environmental conservation. It's about to go. However, there are a wide variety of types and properties of waste liquid, drainage and sewage, and the current state of treatment technology is not standardized.

  Contaminant treatment technology and related technologies include: a device that leaves oil and water and floats to the upper layer due to the difference in specific gravity to separate oil droplets; a device that separates oil and water through an adsorbent tank; An apparatus has been proposed in which waste liquid in which oil droplets or the like are emulsified is passed through an electrolytic treatment tank and separated by electrophoresis using a difference in interface potential between the oil droplets and water.

As an example of such various separation apparatuses, there is an invention described in Patent Document 1 (Japanese Patent Laid-Open No. 11-114304).
According to the present invention, a floating oil separating means for receiving oil water in a storage tank having an oil water receiving port from an oil water generating source and a separation water discharge pipe and floating and separating the oil droplets is stored via the discharge pipe. An aluminum electrode is housed in an electrolytic tank connected to the tank, and the separated water containing emulsified fine oil droplets is received, electrolyzed, and flocked by aluminum hydroxide by-produced in the electrolytic water to float the oil droplets. Electrolytic separation means for separating, and an adsorption separation means provided with an inlet and outlet for electrolytically treated water treated by the electrolytic separation means and provided with an adsorption treatment chamber containing an adsorbent inside. The oil-water separator is characterized by the fact that

  The invention described in Patent Document 2 (Japanese Patent Laid-Open No. 2013-184114) is an apparatus that can reliably capture, selectively move, and remove contaminants such as cations, anions, or electrolytes in contaminated water. Yes, “The electric field force of the ion exchange group in the gap of the EFIX selectively flows pollutants such as cations, anions, or electrolytes by pouring contaminated water into the lumen of the disc-type field ion exchanger. This is an apparatus that captures by Coulomb force and moves the gap between the field ion exchangers by ion exchange external force such as pressure to remove and efficiently purify it.

  Furthermore, the invention described in Patent Document 3 (Patent No. 5197273) is “made by spraying a slurry in which a binder is added to ceramic powder as droplets in a spray drying chamber and drying the droplets. In the spray drying apparatus for obtaining granulated granules, a layer obtained by coating at least one fibrous inorganic substance of glass fiber, carbon fiber, ceramic fiber and ceramic whisker with a fluororesin is formed on a part of the inner wall of the spray drying chamber. It is a spray drying apparatus characterized by being formed.

JP-A-11-114304 JP 2013-184114 A Japanese Patent No. 5197273

As described above, although the techniques necessary for removing oil and contaminants from the processing fluid are disclosed in the above-mentioned prior documents, oil and contaminants, particularly chemical substances (for example, fluorine and fluorine compounds) are efficiently used. It is still incomplete as a separation technique for removing it.
In addition, the current purification equipment manages the concentration of processing fluid, pH (pH), turbidity, and usage time, and if it exceeds the specified value, it is treated as industrial waste.
B) The processing fluid treated with the current purification equipment will rot over time.
B) Rust tends to occur in the processed product due to adhesion of bacteria (slime) and contaminants in the processing fluid, and a rust removal step occurs when rust is generated.
Etc. have arisen, and development of a cheaper and more efficient device is desired in the industry and the like.

  Against this background, the applicant first separates the oil and water from the wastewater, wastewater, sewage, etc. that contain oil, based on the knowledge gained from years of research and experiments on water treatment. It came to the idea that this was important. First of all, by utilizing the fact that oil and metal ions do not adhere, the initial treatment of waste liquid containing oil, drainage, sewage, etc. achieved separation of oil and water by liquid electrolysis technology, and the separated water As a further detoxification treatment, we succeeded in developing technology to solve the problems by applying spray drying treatment, electrolytic separation treatment and electrolytic sterilization treatment as necessary. And about this technique, patent application has already been filed as Japanese Patent Application No. 2015-17353.

  However, it has been found by subsequent research that the electrolytic cell used in the above-mentioned applied technology cannot satisfactorily separate impurities when purifying the water-soluble processing liquid, and further research and development has been promoted to solve these problems. It was. Under such circumstances, the present applicant has succeeded in developing a new electrolytic water-soluble processing liquid purification device that can more effectively separate impurities mixed in the liquid.

  The present invention has been made on the basis of the above knowledge, and according to the present invention, an electrolytic cell in which contaminants mixed in a liquid are incorporated in a purification apparatus is separated to a level that could not be expected in the past. This makes it possible to circulate and use water-soluble processing fluids. In addition, it is possible to prevent the rust of the processed product and to reduce the cost of processing the product. Due to the electrolytic sterilization effect, bacterial growth can be suppressed and slime formation can be prevented. Furthermore, since the red rust in the working fluid can be oxidized to black rust, the rust prevention effect is significantly improved.

Therefore, the problem solving means adopted by the present invention is:
Collect the electrolytic cell, the electrodes, stirring blades and partition plates arranged in the electrolytic cell, the floating material (contaminant) scraper scraped at the top of the electrolytic cell, and the floating material scraped by the scraper. The dirty processing tank is provided with a dirty processing tank, and the dirty processing tank for collecting the floating substance includes an oil collecting can and a dirty receiving tank for collecting foreign substances. A water-soluble machining liquid purifying apparatus characterized in that a circulation tank for circulation in the interior is provided. Further, in the electrolytic cell 3, there is a flow between the partition plate 3 and the wall of the electrolytic cell 3. A passage 3e is formed and a flow path 3f is formed between the partition plate 3 and the bottom wall of the electrolytic cell 3, and the liquid overflowing from the flow path 3e is returned to the circulation tank 1 via a pipe. Configured as It is a water-soluble processing liquid purification apparatus characterized by the above-mentioned.

  According to the purification apparatus for separating contaminants from the waste liquid, waste water, etc. of the present invention, it becomes possible to effectively remove the contaminants from the processing waste liquid, and in particular, oils and contaminants mixed in the liquid It has become possible to reliably separate such contaminants. In addition, the purified machining fluid can be recycled.

It is composition explanatory drawing of an example of a water-soluble process liquid purification apparatus. It is a figure which shows the effect of aqueous solution life extension by electrolysis.

The embodiment for carrying out the present invention is as follows:
Collect the electrolytic cell, the electrodes, stirring blades and partition plates arranged in the electrolytic cell, the floating material (contaminant) scraper scraped at the top of the electrolytic cell, and the floating material scraped by the scraper. The dirty processing tank is provided with a dirty processing tank, and the dirty processing tank for collecting the floating substance includes an oil collecting can and a dirty receiving tank for collecting foreign substances. An apparatus for purifying water-soluble machining liquid, comprising a circulation tank for circulation inside.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of a water-soluble machining fluid purification device according to the present invention, and FIG. 2 is a diagram showing a purification state by electrolytic purification.

  In the figure, reference numeral 1 denotes a waste liquid used in a machine tool or the like, specifically, a processing waste liquid used in a work process such as polishing, lathe, induction hardening, alkali cleaning, etc., and further circulating to purify the treatment liquid. This tank is shown as a tank that can store and circulate about 200 to 400 liters of liquid in this example, and an electrolytic tank 3 is connected to the circulation tank 1 via a pump 2. The electrolytic tank 3 is a tank for purifying the used water-soluble processing liquid sent from the circulation tank 1, and an electrode 3a, a stirring blade 3b, and a partition plate 3c are disposed in the tank, and further, an upper part of the tank is provided. A dirty processing scraper 3d for scraping off impurities and the like floating on the upper part of the tank is disposed. A flow path 3e is formed between the partition plate 3c and the tank wall, and a flow path 3f is formed between the partition wall 3c and the bottom of the tank, and the liquid subjected to the electrolytic treatment in the tank passes through the flow paths 3f and 3e. It passes through the upper part of the tank, and the purified working fluid is returned to the circulation tank 1 through the pipe 4.

The contaminants and oil scraped by the dirty scraper 3d are placed in the dirty treatment tank 5 and further separated into contaminants and oil, the contaminants are in the dirty receiving tank 7, and the oil and the like are in the oil can 6 It has come to be collected.
The electrode 3a and the stirring blade 3b arranged in the electrolytic cell 3 are electrically connected to a control panel, and the operation can be controlled by a command from the control panel. The control panel controls waste liquid conductivity, high frequency, and the like.

The operation of the present invention will be described below.
Contaminated water that has been used by machine tools or the like is first stored in the circulation tank 1. The contaminated liquid stored in the circulation tank 1 is sent to the electrolytic cell 3 by the pump 2 and purified in the electrolytic cell.
Contaminants, oil, etc. separated in the electrolytic bath 3 are discharged out of the bath by the dirty processing scraper 3d, and further separated into foreign materials and oil in the dirty processing bath 5, and the foreign materials are sent to the dirty receiving bath 7. The oil is sent to the oil can 6 and collected. The liquid from which the oil and impurities are separated is sent again to the circulation tank 1 through the flow paths 3f and 3c and the pipe 4 partitioned by the partition plate from the lower side of the tank. In this way, a predetermined amount of the contaminated liquid is circulated in the electrolytic cell 3, and finally all the contaminated liquid is purified and reused.
FIG. 2 shows the elapsed time of the electrolytic purification treatment (when the electrolytic purification is movable). In this apparatus, as shown in the figure, the polluted water (thick solid line) starts to rapidly decrease in electrical conductivity after 5 minutes of purification treatment, and after about 10 minutes, the electrical conductivity decreases to about 1.5, and further 1 hour. Later, the electrical conductivity drops to 1, and after one month it is purified to the same level as the new aqueous solution. Further, the contamination of the machining liquid usually starts to increase from about one month as shown in the figure. The electrical conductivity of 2 is a value at which the rotten odor of the liquid is hardly felt by the nose.

As mentioned above, although the Example of this invention has been described, since the water-soluble processing liquid purification apparatus of this invention is an electrolysis separation of the oily water and impurities in a waste liquid, such as cutting and polishing from industrial factories, etc. It can be applied to waste liquid treatment at waste liquid and plating factories, food factories, etc., and can contribute to significant cost reduction, so it can be expected to be widely accepted by industry. Furthermore, since the machining fluid can be circulated and used, waste of the machining fluid can be eliminated.
The present invention can be implemented in various other forms without departing from the spirit and main features thereof. For this reason, the above-described embodiments are merely examples, and the present invention should not be construed in a limited manner.

DESCRIPTION OF SYMBOLS 1 Circulation tank 2 Pump 3 Electrolysis tank 3a Electrode 3b Stirring blade 3c Partition plate 3d Dirty processing scraper 3e, 3f Flow path 4 Pipe 5 Dirty processing tank 6 Oil can 7 Dirty receiving tank

Claims (2)

The electrolytic cell 3, the electrode 3 a disposed in the electrolytic cell, the stirring blade 3 b and the partition plate 3 c, the dirt (dirt) scraping scraper 3 d disposed above the electrolytic cell, and the scraper Dirty treatment tank 5 for collecting the floated floating substance, and the dirty treatment tank for collecting the floating substance is provided with a can 6 for oil collection and a dirty receiving tank 7 for collecting foreign substances. Is equipped with a circulation tank 1 for storing the electrolytically purified liquid and circulating it again in the electrolytic tank.   In the electrolytic cell 3, a flow channel 3 e is formed between the partition plate 3 and the wall of the electrolytic cell 3, and a flow channel 3 f is formed between the partition plate 3 and the bottom wall of the electrolytic cell 3. The water-soluble machining liquid purification apparatus according to claim 1, wherein the liquid formed and overflowed from the flow path 3e is returned to the circulation tank 1 via a pipe.

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