CN110461544A - The regenerating unit of grinding fluid and the regeneration method of grinding fluid - Google Patents
The regenerating unit of grinding fluid and the regeneration method of grinding fluid Download PDFInfo
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- CN110461544A CN110461544A CN201780088519.1A CN201780088519A CN110461544A CN 110461544 A CN110461544 A CN 110461544A CN 201780088519 A CN201780088519 A CN 201780088519A CN 110461544 A CN110461544 A CN 110461544A
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Abstract
The regenerating unit of grinding fluid of the invention is the regenerating unit of the grinding fluid after the use containing grindstone dust, wherein, the regenerating unit of the grinding fluid includes the retention basin and UF membrane module of the grinding fluid after storing the use, the UF membrane module has the filter membrane that the grindstone dust is separated from the grinding fluid after the use being stored in the retention basin, and the average pore size of the filter membrane is 1.0 μm or more and 10.0 μm or less.The regeneration method of grinding fluid of the invention is the regeneration method of the grinding fluid after the use containing grindstone dust, wherein, the regeneration method of the grinding fluid has the UF membrane process for separating the grindstone dust from the grinding fluid after the use using filter membrane, and the average pore size of the filter membrane is 1.0 μm or more and 10.0 μm or less.
Description
Technical field
The present invention relates to the regeneration methods of the regenerating unit of grinding fluid and grinding fluid.
This application claims the priority based on Japanese publication filed on March 23rd, 2017 the 2017-057082nd, and help
Draw the whole contents recorded in above-mentioned Japanese publication.
Background technique
The grindings device such as fret saw is widely used in order to cut the workpieces such as metallic object.In addition, when utilizing
When the grinding device cutting processing object, mostly using the dispersion liquid for being dispersed with abrasive grain in grinding fluid.The dispersion liquid is logical
Cross the frictional heat of lubricity, inhibition at the contact site of grinding device improved between grinding device and workpiece
Generation, to inhibit the breakage of grinding device, thermal deformation etc..
On the other hand, due to being mixed into oil slick, lubricating oil, chip, Frication powder, microorganism etc. in the above-mentioned grinding fluid after using
Grindstone dust, therefore the grinding fluid after the use cannot be recycled as former state.Therefore, the grinding fluid after previous use is straight in removing impurity
To after meeting standard of drainage, discarded as industrial waste.
However, to environment, the load becomes large, and abandonment charge also increases when grinding fluid after discarded use.Therefore, such as
The present studies the grinding fluid after removing grindstone dust, then recycling removing grindstone dust in the grinding fluid after using.In addition,
As such reuse method, proposes and remove the method for grindstone dust (with reference to special open 2010- using centrifuge separation and UF membrane
No. 221337 bulletins).
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2010-221337 bulletin
Summary of the invention
The regenerating unit for the grinding fluid that one embodiment of the present invention is related to is the grinding fluid after the use containing grindstone dust
Regenerating unit, wherein the regenerating unit of the grinding fluid includes the retention basin and film point of the grinding fluid after storing the use
From module, the UF membrane module has separates the grindstone dust from the grinding fluid after the use being stored in the retention basin
Filter membrane, and the average pore size of the filter membrane be 1.0 μm or more and 10.0 μm or less.
The regeneration method for the grinding fluid that one embodiment of the present invention is related to is the grinding fluid after the use containing grindstone dust
Regeneration method, wherein the regeneration method of the grinding fluid has separates institute using filter membrane from the grinding fluid after the use
The UF membrane process of grindstone dust is stated, and the average pore size of the filter membrane is 1.0 μm or more and 10.0 μm or less.
Detailed description of the invention
Fig. 1 be indicate one embodiment of the present invention relates to grinding fluid regenerating unit schematic diagram.
Fig. 2 is the flow chart for indicating to have used the regeneration method of the grinding fluid of the regenerating unit of the grinding fluid of Fig. 1.
Fig. 3 is showing for the regenerating unit for the grinding fluid for indicating that the mode different from the regenerating unit of the grinding fluid of Fig. 1 is related to
It is intended to.
Fig. 4 is the flow chart for indicating to have used the regeneration method of the grinding fluid of the regenerating unit of the grinding fluid of Fig. 3.
Specific embodiment
[disclosure problem to be solved]
The reuse method of grinding fluid after the use recorded in above-mentioned bulletin is, by containing abrasive grain, dispersion liquid and
Grinding fluid after the use of chip is centrifuged, first recycling abrasive grain, then by after to abrasive grain use after the recovery
Grinding fluid is centrifuged at a high speed, to separate chip, and then by carrying out to the grinding fluid after the use for having separated chip
UF membrane, to recycle grinding fluid.
However, the reuse method of the grinding fluid needs separation process by 3 stages, process to regenerate grinding fluid
Many and diverse and grinding fluid regeneration treatment is taken time and energy.In addition, the reuse method of the grinding fluid is the centrifuge separation 2 stages
The method for carrying out UF membrane afterwards, the aperture of the film for the UF membrane are 0.01 μm or more and 1 μm or less.Therefore, according to the mill
The reuse method of liquid is cut, the permeation flux (flux) of grinding fluid reduces, and can't improve enough the regeneration efficiency of grinding fluid.
The present invention is made based on such situation, and project is that providing one kind can easily and effectively carry out
The regenerating unit of the regenerated grinding fluid of grinding fluid after use and the regeneration method of grinding fluid.
[effect of the disclosure]
The regenerating unit of grinding fluid of the invention and the regeneration method of grinding fluid can easily and effectively carry out using
The regeneration of grinding fluid afterwards.
[explanations of embodiments of the present invention]
Embodiments of the present invention are listed first and are illustrated.
The regenerating unit for the grinding fluid that one embodiment of the present invention is related to is the grinding fluid after the use containing grindstone dust
Regenerating unit, wherein the regenerating unit of above-mentioned grinding fluid includes the retention basin and film point of the grinding fluid after storing above-mentioned use
From module, the UF membrane module has separates above-mentioned grindstone dust from the grinding fluid after the use being stored in above-mentioned retention basin
Filter membrane, and the average pore size of above-mentioned filter membrane be 1.0 μm or more and 10.0 μm or less.
In the regenerating unit of the grinding fluid, the average pore size of filter membrane possessed by UF membrane module be 1.0 μm or more and
Therefore 10.0 μm hereinafter, selectively and effectively can separate grindstone dust in the grinding fluid after using.Therefore, the mill
The regenerating unit for cutting liquid can easily and effectively carry out the regeneration of the grinding fluid after.
The regenerating unit of above-mentioned grinding fluid can also have in the grinding fluid after the use being stored in above-mentioned retention basin
The flocculating agent for adding flocculating agent adds mechanism.In this way, by also having to the grinding after the use being stored in above-mentioned retention basin
The flocculating agent that flocculating agent is added in liquid adds mechanism, grindstone dust can be made to agglomerate using above-mentioned flocculating agent, can more reliably pressed down
Grindstone dust processed penetrates filter membrane.Therefore, it can be easier and reliably carry out the regeneration of the grinding fluid after.
The main component of above-mentioned filter membrane can be polytetrafluoroethylene (PTFE) (PTFE).Since the main component of above-mentioned filter membrane is
PTFE, above-mentioned filter membrane has tridimensional network, therefore can efficiently separate above-mentioned grindstone dust, and hole is not easy by this
Grindstone dust closing.In addition, since above-mentioned filter membrane has tridimensional network, it is above-mentioned even if the filter membrane is slightly worn
The separation function of grindstone dust is also not easy to reduce.Further, since the main component of above-mentioned filter membrane is PTFE, it is therefore, and other
Organic film is compared, and is improved to the patience of sodium hydroxide etc., therefore be capable of forming relatively inexpensive and high durability filter membrane.
In addition, the regeneration method for the grinding fluid that another mode of the invention is related to is the mill after the use containing grindstone dust
Cut the regeneration method of liquid, wherein the regeneration method of above-mentioned grinding fluid has using filter membrane from the grinding fluid after above-mentioned use
The UF membrane process of above-mentioned grindstone dust is separated, and the average pore size of above-mentioned filter membrane is 1.0 μm or more and 10.0 μm or less.
In the regeneration method of the grinding fluid, the average pore size of filter membrane used in UF membrane process be 1.0 μm or more and
Therefore 10.0 μm hereinafter, selectively and effectively can separate grindstone dust in the grinding fluid after using.Therefore, the mill
The regeneration method for cutting liquid can easily and effectively carry out the regeneration of the grinding fluid after.
It should be noted that in the present invention, " grindstone dust " refers to the mixed impurity in grinding." average pore size "
Refer to the average value in the aperture in the case where the positive round for being scaled homalographic." main component " refers to the most ingredient of content, example
Such as refer to that content is the ingredient of 50 mass % or more.
[specific embodiment]
Hereinafter, suitably refer to attached drawing while, to embodiment of the present invention relate to grinding fluid regenerating unit
And the regeneration method of grinding fluid is illustrated.
[first embodiment]
<regenerating unit of grinding fluid>
The regenerating unit 1 (hereinafter referred to as " regenerating unit 1 ") of the grinding fluid of Fig. 1 is the mill after the use containing grindstone dust
Cut the regenerating unit of liquid X.The regenerating unit 1 include storage use after grinding fluid X retention basin (grinding fluid retention basin 2) and
UF membrane module 3, the UF membrane module 3 has to be separated from the grinding fluid X after the use being stored in grinding fluid retention basin 2
The filter membrane of grindstone dust.The average pore size of the above-mentioned filter membrane of the regenerating unit 1 is 1.0 μm or more and 10.0 μm or less.In addition,
The regenerating unit 1, which also includes to be discharged in UF membrane module 3, is discharged slot 4 by the grindstone dust of the grindstone dust A of UF membrane and will be from
Grinding fluid retention basin 2 be discharged use after grinding fluid X force feed to UF membrane module 3 pump 5.
The average pore size of filter membrane possessed by the UF membrane module 3 of the regenerating unit 1 be 1.0 μm or more and 10.0 μm with
Under, therefore can grindstone dust selectively and effectively be separated in the grinding fluid X after using.In addition, being filled in the regeneration
It sets in 1, also separates abrasive grain while grindstone dust capable of being stated in separation in the grinding fluid X after using.It is filled in previous regeneration
In setting, abrasive grain and chip are separated in the grinding fluid after using first with centrifugal separator, then penetrating dispersion liquid has
The ceramic membrane in 0.01 μm or more and 1 μm aperture below, thus recycles grinding fluid.In contrast, the hair of people etc. according to the present invention
It is existing, by being 1.0 μm or more using average pore size and 10.0 μm of filter membranes below separate grinding in the grinding fluid X after using
Bits and abrasive grain also can be by the mills after UF membrane even if centrifugal separator is not utilized to be pre-separated abrasive grain, bigger grindstone dust
The content for cutting the valuable components contained in liquid is maintained roughly the same with the grinding fluid before use.Therefore, the grinding fluid is again
Generating apparatus can easily and effectively carry out the regeneration of the grinding fluid after.
(grinding fluid)
Grinding fluid (grinding fluid before use) using cutting metallic object of grinding device fret saw etc. such as adding
Lubricity when work object, between raising grinding device and workpiece.
For type as above-mentioned grinding fluid, be not particularly limited, such as can enumerate: in water containing mineral oil,
Vegetable and animals oils, surfactant (anionic, cationic, non-ionic) etc. and the type of latex type that milky appearance is presented；In
The solvable of transparent or semitransparent appearance is presented containing surfactant, water soluble ingredient, mineral oil, vegetable and animals oils etc. in water
Class；The oil base class etc. of the EP agents such as sulphur, chlorine is individually mixed with containing the oil such as kerosene or in the oil.Wherein, as at this
For the grinding fluid for carrying out regeneration treatment in regenerating unit 1, preferred emulsion class.The regenerating unit 1 is to the type of latex type after using
In the case that grinding fluid is handled, be easy by the content ratio of the valuable components of the grinding fluid be maintained at use it is preceding identical
Degree.As for the content ratio of the oil of water 100 mass parts, such as being set in above-mentioned emulsion class grinding fluid
It is set to 5 mass parts or more and 15 below the mass.It should be noted that the grinding fluid usually makes in the state of being dispersed with abrasive grain
With.For the average grain diameter of the abrasive grain, typically about 10 μm or more and about 50 μm or less.
(grinding fluid retention basin)
Grinding fluid retention basin 2 stores the grinding fluid X after use.Grinding fluid X after use is supplied in grinding
Thus the contact portion of grinding device and workpiece has been mixed into the grinding such as oil slick, lubricating oil, chip, Frication powder, microorganism
Bits.Grinding fluid retention basin 2 is for example so that the grinding fluid X after what is used in grinding use passes through discharge pipe 6 at any time and stores
The mode deposited is constituted.
(UF membrane module)
By it is being stored in grinding fluid retention basin 2, using pump 5 force feeds use after grinding fluid X supply to UF membrane module
3.In the present embodiment, UF membrane module 3 is the UF membrane module of the dead end formula of the External Pressure Type with filter membrane.It is specific and
Speech, UF membrane module 3 has more hollow-fibre membranes, and is supplied with the grinding fluid X after capable of using to these hollow fibres
The mode for tieing up the periphery surface side of film is constituted.UF membrane module 3 by the way that the periphery surface side of these hollow-fibre membranes is adjusted to high pressure,
To preventing the grindstone dust of the certain partial size contained in the grinding fluid X after or more and the transmission of abrasive grain, and make it is other at
Divide the inside through at most root hollow-fibre membrane.Regeneration grinding fluid is used as through to the filtrate inside above-mentioned more hollow-fibre membranes
Y is discharged to outside system, is reused in grinding.In other words, the regenerating unit 1 is by only UF membrane module 3 from mill
It cuts and separates grindstone dust in liquid X, therefore preferably do not have other separative units such as centrifugal separator.
It is as described above 1.0 μm, more preferably 1.5 μm for the lower limit of average pore size as above-mentioned filter membrane.It is another
Aspect, for the upper limit of the average pore size as above-mentioned filter membrane, be as described above 10.0 μm, more preferably 5.0 μm, further
Preferably 2.5 μm.When above-mentioned average pore size is less than above-mentioned lower limit, it is possible to valuable components can not be made fully through to filter membrane
Inside or be possible to filtrate permeation flux reduce, so that the regeneration efficiency for regenerating grinding fluid Y becomes inadequate.On the contrary,
When above-mentioned average pore size is greater than the above-mentioned upper limit, it is possible to be difficult to be ground mineral oil, vegetable and animals oils, BOD (BOD) etc.
Bits are sufficiently carried out UF membrane.
It is preferred that the uniform pore diameter in multiple holes of above-mentioned filter membrane.The upper limit of the coefficient of alteration in the aperture as above-mentioned multiple holes
For, preferably 0.20, more preferably 0.10, further preferably 0.05.When above-mentioned coefficient of alteration is greater than the above-mentioned upper limit, having can
Valuable components can unintentionally be removed or the relatively large grindstone dust of partial size is possible to be mixed into regeneration grinding fluid Y, it is possible to
It is difficult to keep the quality of regeneration grinding fluid Y.On the other hand, as above-mentioned multiple holes aperture coefficient of alteration lower limit for,
It is not particularly limited, for example, it can be set to being 0.01.Appoint it should be noted that " coefficient of alteration in the aperture in multiple holes " refers to use
The standard deviation in the aperture in 10 holes that meaning extracts is worth divided by average diameter.
It for material as above-mentioned filter membrane, is not particularly limited, synthetic resin, ceramics etc. can be used for example.Separately
Outside, for as above-mentioned synthetic resin, such as can to enumerate polyethylene, polypropylene, polyvinylidene fluoride, ethylene-vinyl alcohol total
Polymers, polyamide, polyimides, polyetherimide, polystyrene, polysulfones, polyvinyl alcohol, polyphenylene oxide, polyphenylene sulfide, acetic acid are fine
Tie up the thermoplastic resins such as element, polyacrylonitrile, PTFE.Wherein, preferably mechanical strong for as the main component of above-mentioned filter membrane
After degree, chemical-resistant, heat resistance, weatherability, noninflammability etc. be excellent and porous PTFE, more preferable uniaxial or biaxial stretching
PTFE.Since the main component of above-mentioned filter membrane is PTFE, above-mentioned filter membrane has tridimensional network, therefore, energy
Grindstone dust is enough efficiently separated, and is not easy to cause hole to be closed because of the grindstone dust.In addition, since above-mentioned filter membrane has three
Reticular structure is tieed up, therefore, even if the filter membrane is slightly worn, the separation function of grindstone dust is also not easy to reduce.In addition, above-mentioned
In the case that filter membrane is formed by ceramics, cost required for the formation of the filter membrane is got higher, and the filter membrane is possible to brokenly
It splits.In contrast, since the main component of above-mentioned filter membrane is PTFE, it is capable of forming relatively inexpensive and high durability mistake
Filter membrane.
In addition, in the regenerating unit 1, when continuing the regeneration treatment of the grinding fluid X after, the grinding such as oil
Bits are gradually attached to the surface of above-mentioned filter membrane.It is cleaned by using strong alkaline aqueous solutions such as sodium hydrate aqueous solutions,
It is easy to remove these grindstone dusts.It is PTFE by the main component of above-mentioned filter membrane, with other organic film phases about this point
Than can be improved the patience to sodium hydroxide etc., the long lifetime of above-mentioned filter membrane capable of being promoted, and then the regeneration can be promoted
The long lifetime of device 1.
In the case where above-mentioned filter membrane is to make hollow-fibre membrane as main component with PTFE, above-mentioned filter membrane for example may be used
To use as forming pipe obtained from PTFE extrusion molding.Above-mentioned filtering is formed using extrusion molding pipe in this way
Film can be easy to improve the mechanical strength of the filter membrane and also be able to easily form hole.It should be noted that the Guan You
Choosing is in the axial direction with about 50% or more and about 700% or less, in the circumferential with the extensibility below of about 5% or more and about 100%
It is stretched.Axial extensibility as the pipe is for the lower limit of the ratio between circumferential extensibility, and preferably 2, more preferably
5.On the other hand, for as the upper limit of above-mentioned ratio, preferably 15, more preferably 10.By by above-mentioned than being adjusted to above-mentioned model
In enclosing, the hole of above-mentioned filter membrane can be formed as to the elongate using the axial direction of hollow-fibre membrane as long axis, be typically
Ellipticity.In the case that the hole of above-mentioned filter membrane is elongate as a result, even if the average pore size of above-mentioned filter membrane is set to
It is bigger, it is also easy certainly to prevent the transmission of grindstone dust.Therefore, according to this constitution, be easy improve filtrate permeation flux from
And sufficiently improve the formation efficiency of regeneration grinding fluid Y.
Above-mentioned pipe can for example obtain in the following way: the liquid lubricants such as naphtha being blended in PTFE fine powder, lead to
It crosses after extrusion molding etc. forms tubulose and is stretched.In addition, passing through the temperature by the pipe more than the fusing point for being maintained at PTFE fine powder
It keeps being sintered to about a few minutes for about tens seconds in degree, for example, about 350 DEG C~about 550 DEG C of heating furnace, can be improved ruler
Very little stability.
For the lower limit of porosity as above-mentioned more hollow-fibre membranes, preferably 50%, more preferably 55%.It is another
Aspect, for the upper limit of the porosity as above-mentioned more hollow-fibre membranes, preferably 90%, more preferably 85%.Above-mentioned hole
When gap rate is unsatisfactory for above-mentioned lower limit, the permeation flux of filtrate is reduced, and the regeneration efficiency of the grinding fluid X after use is possible to become not
Sufficiently.On the contrary, the mechanical strength of above-mentioned more hollow-fibre membranes is possible to become not fill when above-mentioned porosity is greater than the above-mentioned upper limit
Point.It should be noted that porosity refers to the ratio of the total volume of hole relative to the volume of above-mentioned more hollow-fibre membranes, it can
To be found out by the density for measuring more hollow-fibre membranes according to ASTM-D-792.
(grindstone dust discharge slot)
Grindstone dust discharge slot 4 is connected to the space of the periphery surface side of the above-mentioned more hollow-fibre membranes of UF membrane module 3.Not
Grindstone dust discharge slot 4 is discharged to through the grindstone dust of the inside of the above-mentioned more hollow-fibre membranes to UF membrane module 3.Separately
Outside, the abrasive grain for including in the grinding fluid X after use is discharged to grindstone dust discharge slot 4.It is discharged to the mill of grindstone dust discharge slot 4
Swarf is for example discarded as industrial waste etc. at any time.
<regeneration method of grindstone dust>
Then, with reference to Fig. 2, (hereinafter also referred to as " again to the regeneration method of the grinding fluid of the regenerating unit for having used Fig. 1
Generation method ") it is illustrated.The regeneration method is the regeneration method of the grinding fluid X after the use containing grindstone dust.The regeneration method
With the UF membrane process (S1) for separating above-mentioned grindstone dust in grinding fluid X after using using filter membrane.In the regeneration method,
The average pore size of above-mentioned filter membrane is 1.0 μm or more and 10.0 μm or less.
In the regeneration method, since the average pore size of the filter membrane used in above-mentioned UF membrane process is 1.0 μm or more
And therefore 10.0 μm hereinafter, selectively and effectively can separate grindstone dust in the grinding fluid after using.Therefore, should
The regeneration method of grinding fluid can easily and effectively carry out the regeneration of the grinding fluid X after.
(UF membrane process)
S1 is carried out by the UF membrane module 3 of Fig. 1.Specifically, being stored using above-mentioned filter membrane to grinding fluid in S1
It is being stored in slot 2, utilize pump 5 force feeds grinding fluid X in certain partial size more than grindstone dust and abrasive grain carry out UF membrane.In S1
In, the filtrate that will transmit through above-mentioned filter membrane is discharged to outside system as regeneration grinding fluid Y.On the other hand, it in S1, will not penetrate
The grindstone dust A of above-mentioned filter membrane is expelled to grindstone dust discharge slot 4.
For the upper limit as the average permeation flux of the filtrate in S1, after sufficiently capturing use using above-mentioned filter membrane
Grinding fluid X in from the viewpoint of the grindstone dust that contains, preferably 7.0m/D, more preferably 5.0m/D.On the other hand, as upper
For the lower limit for stating average permeation flux, from the viewpoint of preventing the regeneration efficiency of regeneration grinding fluid Y from becoming inadequate, such as
Preferably 0.1m/D, more preferably 0.4m/D.It should be noted that " average permeation flux " refers on grindstone dust is not attached to
It is logical to the infiltration in the case where the UF membrane of grindstone dust progress 5 hours in the grinding fluid after using in the state of stating filter membrane
The average value of amount.
It should be noted that since the regeneration method is by separating grindstone dust in only grinding fluid X of the S1 after using,
It is preferred that not having other separation processes such as centrifugal separation process.On the other hand, in the regeneration method, by S1 continue into
When row membrane separation, the grindstone dusts such as oil are gradually attached to the surface etc. of above-mentioned filter membrane.Therefore, which can also
To have the cleaning process cleaned when S1 stops to above-mentioned filter membrane.Hereinafter, being illustrated to the cleaning process.
(cleaning process)
For the specific cleaning method in above-mentioned cleaning process, above-mentioned filter membrane is attached to as long as can remove
Grindstone dust is then not particularly limited, and preferably above-mentioned cleaning process includes the rubbing cleaning that rubbing cleaning is carried out to above-mentioned filter membrane
Process and the alkali cleaning process for carrying out alkali cleaning to above-mentioned filter membrane after rubbing cleaning process.In above-mentioned rubbing cleaning process
In, such as rubbing is carried out to above-mentioned filter membrane with hand and is cleaned.In addition, in above-mentioned alkali cleaning process, such as use sodium hydroxide
The strong alkali solutions such as aqueous solution carry out alkali cleaning to above-mentioned filter membrane.It is as above in above-mentioned filter membrane for the regeneration method
It is described using PTFE as main component in the case where, rubbing cleaning easily can be carried out to the filter membrane.In addition, by above-mentioned
The main component of filter membrane is PTFE, even if the case where carrying out alkali cleaning using strong alkali solutions such as sodium hydrate aqueous solutions
Under, it is also able to suppress the deterioration of above-mentioned filter membrane, therefore above-mentioned filter membrane long lifetime can be promoted, and then this can be promoted again
The long lifetime of generating apparatus 1.
[second embodiment]
<regenerating unit of grinding fluid>
The regenerating unit 21 (hereinafter also referred to as " regenerating unit 21 ") of the grinding fluid of Fig. 3 is after the use containing grindstone dust
Grinding fluid X regenerating unit.The regenerating unit 21 includes the grinding fluid retention basin 2 and film of the grinding fluid X after storage use
Separation module 3, the UF membrane module 3 has separates mill from the grinding fluid X after the use being stored in grinding fluid retention basin 2
The filter membrane of swarf.In addition, the regenerating unit 21 includes discharge in UF membrane module 3 by the grinding of the grindstone dust A of UF membrane
Bits discharge slot 4 and by the pump 5 of the grinding fluid X force feed after the use being discharged from grinding fluid retention basin 2 to UF membrane module 3.This
Outside, which, which has, adds the solidifying of flocculating agent B into the grinding fluid X after the use being stored in grinding fluid retention basin 2
Mechanism 22 is added in poly- agent.In the regenerating unit 21, the average pore size of above-mentioned filter membrane is 1.0 μm or more and 10.0 μm or less.Make
For in the regenerating unit 21 grinding fluid retention basin 2, UF membrane module 3, grindstone dust be discharged slot 4 and pump 5 for, due to figure
1 regenerating unit is identical, therefore assigns identical label and omit the description.
(flocculating agent addition mechanism)
Flocculating agent addition mechanism 22 has for supplying to the supply pipe 22a of grinding fluid retention basin 2 and inciting somebody to action flocculating agent B
The blender 22b that the flocculating agent B being supplied in grinding fluid retention basin 2 is mixed with the grinding fluid X after use.Flocculating agent adds machine
Structure 22 will use after grinding fluid X in contain grindstone dust, it is typical for for oil flocculating.In detail, flocculating agent adds
Mechanism 22 will use after grinding fluid X in the above-mentioned grindstone dust that contains so that its partial size is greater than the side in the aperture of above-mentioned filter membrane
Formula flocculating.
For flocculating agent B, as long as the grindstone dust cohesion that can contain in the grinding fluid X after, without spy
It does not limit, such as can enumerate: flocculating agent well known to inorganic flocculant, polymer coagulant etc..As above-mentioned inorganic flocculant
For, such as can enumerate: the aluminium salts such as aluminum sulfate, aluminium polychloride；Iron chloride, ferrous sulfide, bodied ferric sulfate, iron-dioxy
Molysite such as SiClx inorganic polymer etc..In addition, for as above-mentioned polymer coagulant, such as cationic polymerization can be enumerated
Object, anionic polymer and non-ionic polyalcohol.It for above-mentioned cation type polymer, such as can enumerate: poly-
(methyl) acrylate, poly- (methyl) acrylic acid diethylamino ethyl ester, poly dimethyl aminopropyl (first
Base) acrylamide, poly dimethyl aminopropyl (methyl) acrylamide, polyallyl dimethyl amine and its neutralize salt, quaternary salt etc..
For above-mentioned anionic polymer, such as can enumerate: poly- (methyl) acrylic acid, poly, poly- itaconic acid and
Their salt etc..It for above-mentioned non-ionic polyalcohol, such as can enumerate: poly- (methyl) acrylamide, poly- N- isopropyl
Base acrylamide, poly- N, N- dimethyl (methyl) acrylamide etc..
Since there is the regenerating unit 21 flocculating agent to add mechanism 22, grindstone dust can be made solidifying using flocculating agent B
It is poly-, it can more reliably inhibit grindstone dust through above-mentioned filter membrane.Therefore, the regenerating unit 21 can be easier and reliably into
Exercise the regeneration of the grinding fluid X after using.
<regeneration method of grinding fluid>
Then, with reference to Fig. 4, the regeneration method of the grinding fluid for the regenerating unit 21 for having used Fig. 3 is illustrated.The regeneration
Method is the regeneration method of the grinding fluid X after the use containing grindstone dust.The regeneration method is included using filter membrane after using
Grinding fluid X in separate the UF membrane process (S1) of above-mentioned grindstone dust and to after the use being stored in grinding fluid retention basin 2
The flocculating agent that flocculating agent B is added in grinding fluid X adds process (S2).In the regeneration method, the average pore size of above-mentioned filter membrane is
1.0 μm or more and 10.0 μm or less.Since the UF membrane process (S1) in the regeneration method is identical as the regeneration method of Fig. 2, because
This is omitted the description.It should be noted that since the regeneration method is by separating grindstone dust in only grinding fluid X of the S1 after using,
Therefore preferably do not have other separation processes such as centrifugal separation process.In addition, the regeneration method can also be with the regeneration method of Fig. 2
It is same that there is the cleaning process cleaned to above-mentioned filter membrane.
(flocculating agent addition process)
S2 adds mechanism 22 by flocculating agent and carries out.Opportunity for carrying out S2 is not particularly limited, such as S2 can be
Grinding fluid X after using every time is supplied to grinding fluid retention basin 2 when progress.In this case, in the regeneration method, in S2
S1 is carried out later.
On the other hand, it in the regeneration method, as shown in figure 4, S1 can be carried out continuously or intermittently, and is obtained by S1
Filtrate in concentration, the concentration for the grindstone dust being stored in grinding fluid retention basin 2 of grindstone dust etc. reach specified value or more
In the case of carry out S2.
Since the regeneration method can add the grinding that process contains in the grinding fluid X after by above-mentioned flocculating agent
Bits cohesion, therefore can more reliably inhibit grindstone dust through filter membrane.
Therefore, which can be easier and reliably carry out the regeneration of the grinding fluid X after.In addition, this is again
Generation method for example by the concentration of the grindstone dust in the filtrate obtained by above-mentioned UF membrane process, be stored in grinding fluid and store
The concentration etc. of grindstone dust in slot 2 carries out S2 in the case where reaching specified value or more, can more stably keep regeneration grinding fluid Y
Quality.
[other embodiment]
It will be understood that embodiments disclosed herein is to illustrate and not restrictive in all respects.The scope of the present invention
It is indicated by claims, and is not limited to the composition of above embodiment, and be intended to be included in and be equal with claims
Whole changes in meaning and scope.
For example, the regenerating unit is not necessarily required to the UF membrane module using dead end formula, such as cross-current type also can be used
UF membrane module.In addition, above-mentioned filter membrane is not necessarily required to as hollow-fibre membrane, such as it is also possible to flat membrane.In addition, this is again
Generating apparatus can generate regeneration grinding fluid by only above-mentioned UF membrane module, but as the grinding in addition to above-mentioned UF membrane module
It considers separating mechanism to be worth doing, such as also can have the mechanism for removing the oil slick in above-mentioned grinding fluid retention basin.
The regenerating unit can be constituted in the form of following: the grinding fluid after a certain amount of use being for example stored in grinding fluid
In retention basin, the regenerated batch-type regenerating unit of whole amount of the grinding fluid is repeated.In addition, the regenerating unit can also be with
Following form is constituted: while continuously or intermittently supplying the grinding fluid after use to grinding fluid retention basin, with the supply
The continous way regenerating unit of filtering UF membrane grindstone dust is utilized in parallel.
Embodiment
Hereinafter, the present invention is described in more detail by embodiment, but the present invention is not limited to these Examples.
[example 1]
By using the regeneration method of the grinding fluid of the regenerating unit 1 of Fig. 1, by the lotion after the use containing grindstone dust
Class grinding fluid generates regeneration grinding fluid.The ingredient of grinding fluid before measuring use, as a result mineral oil is 5800ppm, animals and plants
Oil is 7100ppm, BOD 15000ppm.
In addition, to the ingredient of the grinding fluid after using into capable measurement, as a result are as follows: mineral oil 40000ppm, animals and plants
Oil is 42000ppm, BOD 62000ppm.For the UF membrane module 3 of the regenerating unit 1, use hollow with 3
Total membrane area of tunica fibrosa and these hollow-fibre membranes is 1.05m2, more hollow-fibre membranes average pore size be 2.0 μm
UF membrane module 3.
Grinding fluid 20L after above-mentioned use is stored in grinding fluid retention basin 2, by the complete of the grinding fluid after the use
Portion's amount utilizes 5 force feeds of pump to UF membrane module 3, to separate grindstone dust.Filter pressure in UF membrane module 3 is set as
30kPa.Average seepage discharge through the filtrate of more hollow-fibre membranes is 5.0m/D.Passed through using the measurement of n-hexane extraction method
The ingredient for the regeneration grinding fluid Y that example 1 obtains, as a result are as follows: mineral oil 9600ppm, vegetable and animals oils 12000ppm, BOD are
21000ppm。
[example 2]
By using the regeneration method of the grinding fluid of the device for the regenerating unit 21 for imitating Fig. 3, by containing grindstone dust
Grinding fluid after use generates regeneration grinding fluid.For the grinding fluid after using, grinding same as Example 1 has been used
Liquid.In addition, having used UF membrane module same as Example 1 for as UF membrane module 3.
Use hydrochloric acid as pH adjusting agent, the pH of the grinding fluid after above-mentioned use is adjusted to 6.8.Then, this is made
Grinding fluid after adds up to 20L to be transferred in the multiple containers for imitating grinding fluid retention basin 2, these containers are set to coagulation examination
Test blender.Concentration in these containers using 10g/L is added to aluminium polychloride as flocculating agent.Then, using hydroxide
Sodium is adjusted to 6.8 as pH adjusting agent, by the pH of the grinding fluid after the use after addition flocculating agent.It is stirred using above-mentioned coagulation test
Device is mixed, the grinding fluid after use after pH is adjusted is stirred with mixing speed 150rpm stirring 5 minutes, then with mixing speed 50rpm
It has mixed 10 minutes.Then, by the whole amount force feed of the grinding fluid after the use after the stirring to UF membrane module 3, to separate
Grindstone dust.Filter pressure in UF membrane module 3 is set as same as Example 1.Through the filtrate of more hollow-fibre membranes
Average permeation flux is 2.0m/D.The ingredient of the regeneration grinding fluid Y obtained by example 2 is measured, as a result are as follows: mineral oil is
5600ppm, vegetable and animals oils 5100ppm, BOD 14000ppm.
[example 3 and example 4]
Other than being set as the average pore size of above-mentioned more hollow-fibre membranes as shown in table 1, with side same as example 2
Formula has carried out the regeneration treatment of the grinding fluid after use.
Table 1
[evaluation result]
As shown in table 1, the average pore size of hollow-fibre membrane is solidifying to be added in 2.0 μm and grinding fluid after use
In the example 2 of poly- agent, mineral oil, vegetable and animals oils and BOD can accurately regenerate use with the value before use in same level
Grinding fluid afterwards.It is thought that due to accurately eliminate the oil slick contained in the grinding fluid after use, lubricating oil, chip,
The grindstone dusts such as Frication powder, microorganism.In addition, about the example 1 for not adding flocculating agent relative to example 2, by mineral oil, vegetable and animals oils
Inhibit 0.34 times of content after use with BOD hereinafter, being sufficiently separated grindstone dust in grinding fluid after using.This
Outside, be 3.0 μm and 5.0 μm of example 3 and example 4 about the average pore size of hollow-fibre membrane, mineral oil, vegetable and animals oils and BOD with make
Content after is compared and is reduced.It is thought that because are as follows: it, can in the case where the average pore size of hollow-fibre membrane is above-mentioned value
The oil slick contained in grinding fluid after efficiently separating use.
Appended drawing reference
1,21: the regenerating unit of grinding fluid
2: grinding fluid retention basin
3: UF membrane module
4: slot is discharged in grindstone dust
5: pump
6: discharge pipe
22: flocculating agent adds mechanism
22a: supply pipe
22b: blender
A: grindstone dust
B: flocculating agent
X: the grinding fluid after use
Y: regeneration grinding fluid
Claims (4)
1. a kind of regenerating unit of grinding fluid is the regenerating unit of the grinding fluid after the use containing grindstone dust, wherein described
The regenerating unit of grinding fluid includes
The retention basin of grinding fluid after storing the use and
UF membrane module, the UF membrane module has separates institute from the grinding fluid after the use being stored in the retention basin
The filter membrane of grindstone dust is stated, and
The average pore size of the filter membrane is 1.0 μm or more and 10.0 μm or less.
2. the regenerating unit of grinding fluid as described in claim 1, wherein the regenerating unit of the grinding fluid also has to storage
The flocculating agent that flocculating agent is added in the grinding fluid after the use in the retention basin adds mechanism.
3. the regenerating unit of grinding fluid as claimed in claim 1 or 2, wherein the main component of the filter membrane is polytetrafluoro
Ethylene.
4. a kind of regeneration method of grinding fluid is the regeneration method of the grinding fluid after the use containing grindstone dust, wherein
The regeneration method of the grinding fluid has separates the grindstone dust using filter membrane from the grinding fluid after the use
UF membrane process, and
The average pore size of the filter membrane is 1.0 μm or more and 10.0 μm or less.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2017057082 | 2017-03-23 | ||
| JP2017-057082 | 2017-03-23 | ||
| PCT/JP2017/043460 WO2018173376A1 (en) | 2017-03-23 | 2017-12-04 | Grinding fluid regeneration device and grinding fluid regeneration method |
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| Publication Number | Publication Date |
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| CN110461544A true CN110461544A (en) | 2019-11-15 |
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| JP (1) | JP7003986B2 (en) |
| CN (1) | CN110461544A (en) |
| WO (1) | WO2018173376A1 (en) |
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|---|---|
| JP7003986B2 (en) | 2022-01-21 |
| JPWO2018173376A1 (en) | 2020-01-23 |
| WO2018173376A1 (en) | 2018-09-27 |
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