CN104711657A - Secondary filtration method of ultra-filtration membrane for electroplate liquid - Google Patents
Secondary filtration method of ultra-filtration membrane for electroplate liquid Download PDFInfo
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Abstract
The invention relates to a secondary filtration method of an ultra-filtration membrane for electroplate liquid. The method comprises the following steps: filtering the electroplate liquid by a filter to obtain filter liquor; pressurizing the obtained filter liquor and then conveying the pressurized filter liquor into an ultra-filtration membrane filter; filtering the filter liquor in the ultra-filtration membrane filter to obtain 60-80% of permeate liquid and 20-40% of concentrated liquid based on a plating solution; conveying the obtained concentrated liquid to the filter for participation in circulating filtration. According to the secondary filtration method, the filter and the ultra-filtration membrane filter are used together; large-particle impurities are removed by the filter at first and then high-precision filtration is performed by the ultra-filtration membrane filter, so that the filtration effect of the electroplate liquid can be effectively improved ad various quality problems caused by electroplate liquid pollution are reduced; by combined use of the filter and the ultra-filtration membrane filter, required filtration requirements can be met after one-time filtration, phenomena of pinholes, pock marks, peeling, roughness, blackening, stripes and the like of a plating surface are effectively reduced, the plating quality is improved, and filtration can be guaranteed to be stably and quickly performed.
Description
Technical field
The present invention relates to a kind of cascade filtration method of electroplate liquid, particularly relate to the cascade filtration method of a kind of ultra-filtration membrane for electroplate liquid.
Background technology
Electroplate liquid generally includes main salt, conducting salt, also has the additive such as buffer reagent and such as leveling agent, brightening agent, anti-pin hole agent.Especially the brightening agent in additive, coating can be made to have bright in mirror surface, and leveling ability is good, can also improve coating physical properties, therefore, by wide popularization and application in electroplate liquid.But, in actual applications, organic impurity is formed because the additive in electroplate liquid easily decomposes accumulation in electrodeposition process, thus electroplate liquid is easily by organic impurity or inorganic hazardous metal impurity con, coating is caused to produce the phenomenon such as pit, pin hole, decortication, coarse, blackout, striped, coating internal stress is increased, and bonding strength and corrosion resistance of coating reduce, and affect quality of coating.Therefore, eliminating organic impurity and inorganic hazardous metallic impurity are to the pollution of electroplate liquid, closely bound up to the quality improving electrolytic coating.
In prior art, generally separated from electroplate liquid by impurity by filtering, because filtration is a physical process, during filtration, can not there is chemical transformation in the material in electroplate liquid.And in prior art, the filtered version of electroplate liquid generally adopts turns over groove filtration and continuous circulation filtration.
Turn over groove filtration refer to pump or scoop by hand, solution is filtered in other clean grooves from former work nest, after work nest is cleaned up, refilter (or directly) return former work nest, then supplement adjustment working fluid.Turn over groove good filtration effect, filter more thorough.
It is that solution is extracted in nearly bottom from work nest one end that continuous circulation filters, and filters the other end of return slot, keep the clean of electroplate liquid through filter.Because of filter after electroplate liquid with filter before electroplate liquid mix mutually again, solid impurity reduces gradually, thus efficiency ratio turn over groove filtration low.The object of circulating filtration is mainly to keep clean, and thus prerequisite is that electroplate liquid is inherently more clean, therefore on the basis of turning over groove filtration, should implement circulating filtration again.
Be filter for carrying out the equipment of filter operation, the impact of the effect of filter in electroplating industry on electroplate liquid gains universal acceptance in the industry, and kind also develops into multi items to tackle various professional purpose from single variety.In actual production, there are plastic filter, plate and frame(type)filter press, double-drum filter, duo-lateral filter element filtering machine etc. by the filter used.But in actual application, these filters have certain defect, such as, plastic filter is cleaned and changed loaded down with trivial details; The same cleaned and changed complexity of plate and frame(type)filter press, and have leakage phenomenon to occur, filter quality is poor; Though double-drum filter filter quality still can, cost is high, safeguards complicated; The filter core regeneration difficulty of duo-lateral filter element filtering machine, cost is high.Therefore, the selection of filter and the design of filter method, to the pollution of despumation to electroplate liquid, the quality improving electrolytic coating is most important.
Summary of the invention
The object of the invention is for the above-mentioned problems in the prior art, propose a kind of good filtration effect, quality of coating is high, and cascade filtration method ultra-filtration membrane being used for electroplate liquid of economy, environmental protection.
Object of the present invention realizes by following technical proposal: a kind of ultra-filtration membrane is used for the cascade filtration method of electroplate liquid, and this cascade filtration method mainly comprises:
S1, common filtration: electroplate liquid obtains filtrate by metre filter;
S2, supercharging: filtrate obtained above is sent into after supercharging in ultrafiltration membrance filter machine;
S3, ultrafiltration membrance filter: in ultrafiltration membrance filter machine, filtrate obtains the permeate containing plating solution total amount 60-80% and the concentrated solution containing plating solution total amount 20-40% after filtration;
S4, circulating filtration: concentrated solution obtained above is transported in the strainer in step S1 and participates in circulating filtration.
Ultrafiltration membrance filter machine applies in the filter method of electroplate liquid by the present invention, after metre filter, carry out a ultrafiltration membrance filter again.And ultra-filtration membrane is the micropore filtering film that a kind of aperture is tiny, specification is consistent.It is for motivating force with the pressure difference of film both sides, take ultra-filtration membrane as filtration medium, under pressure, be filtered the filtrate obtained flow through film surface time, the many tiny micropore that ultrafiltration membrane surface gathers only allows water and small-molecule substance pass through and become permeate, the impurity component such as resolvent, ferric ion, colloid substances that in filtrate, volume is greater than the additives such as the brightening agent in film surface micropore footpath is then trapped within the liquid feeding side of ultra-filtration membrane, become concentrated solution, thus realize the object to the filtration of electroplate liquid.Therefore, the cascade filtration method of electroplate liquid of the present invention is first filtered by electroplate liquid, filtrate is obtained after removing the larger impurity of partial particulate, filtrate carries out more high-precision filtration through ultra-filtration membrane again, obtain the comparatively light even free of contamination permeate of contaminating impurity, this permeate can ensure coating surface quality after plating.The concentrated solution being trapped within ultra-filtration membrane liquid feeding side is then again transported in strainer through pipeline or other approach and mixes with the electroplate liquid newly added, enter metre filter, form a filtration cycle loop, like this, electroplate liquid carries out the filtration gone round and begun again through filter method of the present invention, not only can ensure the permeate quality obtained, electroplate liquid nil waste can also be ensured, improve the utilization ratio of electroplate liquid.
Because the filtering accuracy of strainer is generally at about 5 μm, and in electroplate liquid, impurity particle is mostly all below 1 μm, and wherein, impurity particle more than 90% grain graininess of less than 1 μm is all less than 0.75 μm.Illustrate thus, electroplate liquid of the present invention is after common filter filters, the impurity of particle > 5 μm can only be removed, filtrate is filtered by the ultrafiltration membrance filter machine of filtering accuracy < 0.1 μm again, remove the impurity that most of particle is less, make electroplate liquid obtain good filter effect.And in ultrafiltration membrance filter machine filtration procedure, the additives such as brightening agent are little due to granularity, can be become permeate smoothly by ultra-filtration membrane, the decomposition accumulation of the additives such as brightening agent then can be trapped within the liquid feeding side of ultra-filtration membrane and become concentrated solution.Therefore, after the selective filter by ultrafiltration membrance filter machine, obtain the permeate that the concentration of the additives such as filter effect is better, brightening agent is suitable, thus the quality of coating can be ensured.
On the other hand, strainer uses by the present invention together with ultrafiltration membrance filter machine, the large granular impurity being first greater than 5 μm by strainer removal particle, the higher filtration of precision is carried out again by ultrafiltration membrance filter machine, like this with the use of, the filtration velocity of electroplate liquid of the present invention and the stability of filtration can be ensured.Because if only use strainer merely, need repeatedly circulating filtration, but still required filtering requirement can not be reached, thus can not ensure the quality of coating.And if only use merely ultrafiltration membrance filter machine, then because filtering accuracy is high, the impurity particle being trapped within ultra-filtration membrane liquid feeding side is accumulated rapidly formation filter cake layer and thickeies gradually, and electroplate liquid is increased by the resistance of filter cake layer thereupon, filtration velocity just reduces thereupon, has a strong impact on filtration efficiency.So, the present invention by strainer and ultrafiltration membrance filter machine with the use of, first remove large granular impurity by strainer, more high-precision filtration is carried out again by ultrafiltration membrance filter machine, like this, filter and just can reach required filtering requirement one time, and can ensure that filtration can stablize, carry out fast.
Moreover, ultrafiltration membrance filter acc power of the present invention is little, be only 0.5-0.8kw/ platform, and the power of traditional filtering machine is about 2.2kw/ platform, and the filtration efficiency of ultrafiltration membrance filter machine of the present invention is high, filters and can reach a required filter effect, comparing traditional filtering machine needs through repeatedly circulating filtration, and filter method of the present invention energy consumption is in use just relatively low.
In addition, cleaning interval of ultrafiltration membrance filter machine of the present invention be 1-2 the month/time, traditional filtering machine then needs to clean once in about 3 days, comparatively speaking, ultrafiltration membrance filter machine of the present invention considerably reduce electroplate liquid drag-out, clean the waste water that produces and cost of labor etc., make the filter method of electroplate liquid of the present invention reach the multiple effects such as energy-conservation, reduction of discharging, consumption reduction.
Be used at above-mentioned a kind of ultra-filtration membrane in the cascade filtration method of electroplate liquid, the filtration process of step S1 middle filtrator is negative pressure filtration.The filter cake pine produced during negative pressure filtration, not easily stifled filter core.
Be used at above-mentioned a kind of ultra-filtration membrane in the cascade filtration method of electroplate liquid, in step S1, the filter pressure of negative pressure filtration is 0.01-0.05MPa.
Strainer is filtered medium and is divided into upper and lower two chambeies, and after electroplate liquid enters strainer epicoele, enter cavity of resorption by filtration medium under the effect of the pressure and form filtrate, impurity is then trapped within filter media surface and forms filter residue.Along with the carrying out of filtering, the filter cake layer that in filtration procedure, filtration media surface area is deposited thickeies gradually, and liquid is increased by the resistance of filter cake layer thereupon, and filtration velocity just reduces thereupon.Electroplate liquid must overcome these resistances by filter cake layer and filtration medium, and therefore, the control of the working pressure of strainer just seems particularly important, and it realizes filtering impellent that is stable, that carry out fast.If working pressure is too little, along with the prolongation of filter course, the filter cake layer that filtration media surface area is deposited thickeies gradually, and liquid is increased by the resistance of filter cake layer thereupon, and filtration velocity just reduces thereupon, and filter course is slow; And if working pressure is excessive, though can accelerated filtration, impurity easy blocking filtering medium hole when large pressure difference of pressurized after strain, filters and slows down on the contrary.And under the working pressure of strainer of the present invention, filtration can be stablized, carry out fast.
Be used at above-mentioned a kind of ultra-filtration membrane in the cascade filtration method of electroplate liquid, in step S3, the filtration process of ultrafiltration membrance filter machine is positive press filtration.
Be used at above-mentioned a kind of ultra-filtration membrane in the cascade filtration method of electroplate liquid, in step S3, the filter pressure of positive press filtration is 1-2MPa.
Ultrafiltration membrance filter machine, in filtration procedure, is with the pressure difference of ultra-filtration membrane both sides for motivating force equally, under the working pressure of ultrafiltration membrance filter machine of the present invention, can ensure that filtration can stablize, carry out fast.
Be used in the cascade filtration method of electroplate liquid at above-mentioned a kind of ultra-filtration membrane, step S1 middle filtrator is composing in parallel of composing in parallel of being composed in series of single composition or two and above strainer or two and above strainer or two groups and above strainer and every set filter is made up of two and above positioned inline.Two and above positioned inline are used, large granular impurity can be removed to greatest extent, ensure in the filtrate made a gift to someone in ultrafiltration membrance filter machine through topping-up pump containing less large granular impurity, not only can improve the filtration efficiency of ultrafiltration membrance filter machine, improve filtering accuracy, the damage of large granular impurity to ultra-filtration membrane can also be reduced, extend the work-ing life of ultra-filtration membrane.And two and the parallel connection of above strainer are used, under the working limit of ultrafiltration membrance filter machine, the rate of utilization to ultra-filtration membrane can be improved, improve the filtration efficiency of electroplate liquid.
Be used in the cascade filtration method of electroplate liquid at above-mentioned a kind of ultra-filtration membrane, in step S3, ultrafiltration membrance filter machine is composing in parallel and often organizing ultrafiltration membrance filter machine and being composed in series by two and above ultrafiltration membrance filter machine of composing in parallel of being composed in series of single composition or two and above ultrafiltration membrance filter machine or two and above ultrafiltration membrance filter machine or two groups and above ultrafiltration membrance filter machine.Two and the series connection of above ultrafiltration membrance filter machine are used, can filtering accuracy be improved, obtain the permeate that quality is higher, finally improve the phenomenon such as coating surface pin hole, pit, decortication, coarse, blackout, striped, effectively improve quality of coating.And two and the parallel connection of above ultrafiltration membrance filter machine are used, the filtration efficiency to electroplate liquid can be improved.
Compared with prior art, the present invention has following advantage:
1. in the present invention, the filtering accuracy of ultrafiltration membrance filter machine is high, effectively can improve the filter effect of electroplate liquid, reduce because electroplate liquid pollutes the various quality problems produced, effectively improve the phenomenon such as coating surface pin hole, pit, decortication, coarse, blackout, striped, improve quality of coating.
2. strainer uses by the present invention together with ultrafiltration membrance filter machine, first remove large granular impurity by strainer, then carry out more high-precision filtration by ultrafiltration membrance filter machine, like this with the use of, filter and just can reach required filtering requirement one time, and can ensure that filtration can stablize, carry out fast.
3. in the present invention, ultrafiltration membrance filter acc power is little, be only 0.5-0.8kw/ platform, but filtration efficiency is high, filters and can reach a required filter effect, comparing traditional filtering machine needs through repeatedly circulating filtration, and filter method of the present invention energy consumption is in use just relatively low.
4. in the present invention the ultrafiltration membrance filter machine cleaning interval be 1-2 the month/time, decrease the drag-out of electroplate liquid, clean the waste water that produces and cost of labor etc., make the filter method of electroplate liquid of the present invention reach the multiple effects such as energy-conservation, reduction of discharging, consumption reduction.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of a kind of ultra-filtration membrane of the present invention for the cascade filtration method of electroplate liquid.
Embodiment
Be below specific embodiments of the invention, and accompanying drawings is further described technical scheme of the present invention, but the present invention is not limited to these embodiments.
As shown in Figure 1, a kind of ultra-filtration membrane of the present invention is used for mainly employing strainer, topping-up pump and ultrafiltration membrance filter machine in the cascade filtration method of electroplate liquid.This cascade filtration method technique mainly comprises: be first filtered by electroplate liquid and obtain filtrate, the filtrate obtained sent in ultrafiltration membrance filter machine to filter through topping-up pump again and obtain the permeate containing plating solution total amount 60-80% and the concentrated solution containing plating solution total amount 20-40%, concentrated solution is again transported in strainer and filters.
Embodiment 1:
Electroplate liquid elder generation is through Cemented filling in strainer, and the filter pressure of controlling filter is 0.02MPa, is filtered and obtains filtrate.Then send in ultrafiltration membrance filter machine by filtering the filtrate obtained through topping-up pump, the filter pressure controlling ultrafiltration membrance filter machine is 2MPa, filtrate is filtered through ultrafiltration membrance filter machine and is obtained containing the permeate of plating solution total amount 70% with containing the concentrated solution of plating solution total amount 30%, and the concentrated solution containing plating solution total amount 30% obtained again is transported in strainer and filters.
Embodiment 2:
Electroplate liquid elder generation is through Cemented filling in strainer, and strainer is composed in series by 2, and the filter pressure simultaneously controlling 2 strainers is 0.02MPa, and 2 metre filter through being cascaded obtain filtrate.Then send in ultrafiltration membrance filter machine by filtering the filtrate obtained through topping-up pump, the filter pressure controlling ultrafiltration membrance filter machine is 2MPa, filtrate is filtered through ultrafiltration membrance filter machine and is obtained containing the permeate of plating solution total amount 70% with containing the concentrated solution of plating solution total amount 30%, and the concentrated solution containing plating solution total amount 30% obtained again is transported in strainer and filters.
Embodiment 3:
Electroplate liquid is first delivered in 2 strainers be connected in parallel through pipeline respectively, and the filter pressure simultaneously controlling 2 strainers is 0.02MPa, and 2 metre filter through being connected in parallel obtain filtrate.Then send in ultrafiltration membrance filter machine by filtering the filtrate obtained through topping-up pump, the filter pressure controlling ultrafiltration membrance filter machine is 2MPa, filtrate is filtered through ultrafiltration membrance filter machine and is obtained containing the permeate of plating solution total amount 70% with containing the concentrated solution of plating solution total amount 30%, and the concentrated solution containing plating solution total amount 30% obtained again is transported in strainer and filters.
Embodiment 4:
Electroplate liquid is first delivered in 2 set filters be connected in parallel through pipeline respectively, is connected respectively again in every 1 set filter by 2 positioned inline, and the filter pressure simultaneously controlling 4 strainers is 0.02MPa, is filtered and obtains filtrate.Then send in ultrafiltration membrance filter machine by filtering the filtrate obtained through topping-up pump, the filter pressure controlling ultrafiltration membrance filter machine is 2MPa, filtrate is filtered through ultrafiltration membrance filter machine and is obtained containing the permeate of plating solution total amount 70% with containing the concentrated solution of plating solution total amount 30%, and the concentrated solution containing plating solution total amount 30% obtained again is transported in strainer and filters.
Embodiment 5:
Electroplate liquid elder generation is through Cemented filling in strainer, and the filter pressure of controlling filter is 0.02MPa, is filtered and obtains filtrate.Then send in ultrafiltration membrance filter machine by filtering the filtrate obtained through topping-up pump, ultrafiltration membrance filter machine is in series by 2, the filter pressure simultaneously controlling 2 ultrafiltration membrance filter machines is 2MPa, filtrate is filtered through first ultrafiltration membrance filter machine and is obtained the permeate containing plating solution total amount 70% and the concentrated solution containing plating solution total amount 30%, the concentrated solution containing plating solution total amount 30% obtained again is transported in strainer and filters, the permeate containing plating solution total amount 70% obtained is filtered through the 2nd ultrafiltration membrance filter machine and is obtained the permeate containing plating solution total amount 70% and the concentrated solution containing plating solution total amount 30% (filtering with first time ultrafiltration membrance filter machine the permeate containing plating solution total amount 70% obtained is 100% total), the concentrated solution containing plating solution total amount 30% obtained equally again is transported in strainer and filters.
Embodiment 6:
Electroplate liquid elder generation is through Cemented filling in strainer, and the filter pressure of controlling filter is 0.02MPa, is filtered and obtains filtrate.Then send in ultrafiltration membrance filter machine by filtering the filtrate obtained through topping-up pump, ultrafiltration membrance filter machine is formed in parallel by 2, the filter pressure simultaneously controlling 2 ultrafiltration membrance filter machines is 2MPa, filtrate is filtered through 2 ultrafiltration membrance filter machines and is obtained the permeate containing plating solution total amount 70% and the concentrated solution containing plating solution total amount 30% simultaneously, and the concentrated solution containing plating solution total amount 30% obtained again is transported in strainer and filters.
Embodiment 7:
Electroplate liquid elder generation is through Cemented filling in strainer, and the filter pressure of controlling filter is 0.02MPa, is filtered and obtains filtrate.Then send in ultrafiltration membrance filter machine by filtering the filtrate obtained through topping-up pump, ultrafiltration membrance filter machine is formed in parallel by 2 groups, be in series by 2 ultrafiltration membrance filter machines respectively again in every 1 group of ultrafiltration membrance filter machine, the filter pressure simultaneously controlling 4 ultrafiltration membrance filter machines is 2MPa, filtrate filters the permeate obtaining containing plating solution total amount 70% and the concentrated solution containing plating solution total amount 30% through often organizing the 1st ultrafiltration membrance filter machine, the concentrated solution containing plating solution total amount 30% obtained again is transported in strainer and filters, the permeate containing plating solution total amount 70% obtained is filtered through the 2nd ultrafiltration membrance filter machine and is obtained the permeate containing plating solution total amount 70% and the concentrated solution containing plating solution total amount 30% (filtering with first time ultrafiltration membrance filter machine the permeate containing plating solution total amount 70% obtained is 100% total), the concentrated solution containing plating solution total amount 30% obtained equally again is transported in strainer and filters.
With the difference of embodiment 1, embodiment 8 is only that strainer is in series by 2, ultrafiltration membrance filter machine is also in series by 2.
With the difference of embodiment 1, embodiment 9 is only that strainer is in series by 2, ultrafiltration membrance filter machine is formed in parallel by 2.
With the difference of embodiment 1, embodiment 10 is only that strainer is in series by 2, ultrafiltration membrance filter machine is formed in parallel by 2 groups, and often group is in series by 2 ultrafiltration membrance filter machines.
With the difference of embodiment 1, embodiment 11 is only that strainer is formed in parallel by 2, ultrafiltration membrance filter machine is in series by 2.
With the difference of embodiment 1, embodiment 12 is only that strainer is formed in parallel by 2, ultrafiltration membrance filter machine is also formed in parallel by 2.
With the difference of embodiment 1, embodiment 13 is only that strainer is formed in parallel by 2, ultrafiltration membrance filter machine is formed in parallel by 2 groups, and often group is in series by 2 ultrafiltration membrance filter machines.
With the difference of embodiment 1, embodiment 14 is only that strainer is formed in parallel by 2 groups, often group is formed by 2 positioned inline, and ultrafiltration membrance filter machine is in series by 2.
With the difference of embodiment 1, embodiment 15 is only that strainer is formed in parallel by 2 groups, often group is formed by 2 positioned inline, and ultrafiltration membrance filter machine is formed in parallel by 2.
With the difference of embodiment 1, embodiment 16 is only that strainer is formed in parallel by 2 groups, often group is formed by 2 positioned inline, and ultrafiltration membrance filter machine is also formed in parallel by 2 groups, and often group is in series by 2 ultrafiltration membrance filter machines.
The difference of embodiment 17-32 and embodiment 1-16 is only to filter through ultrafiltration membrance filter machine to obtain the permeate containing plating solution total amount 60% and the concentrated solution containing plating solution total amount 40%.
The difference of embodiment 33-48 and embodiment 1-16 is only to filter through ultrafiltration membrance filter machine to obtain the permeate containing plating solution total amount 65% and the concentrated solution containing plating solution total amount 35%.
The difference of embodiment 49-64 and embodiment 1-16 is only to filter through ultrafiltration membrance filter machine to obtain the permeate containing plating solution total amount 75% and the concentrated solution containing plating solution total amount 25%.
The difference of embodiment 65-80 and embodiment 1-16 is only to filter through ultrafiltration membrance filter machine to obtain the permeate containing plating solution total amount 80% and the concentrated solution containing plating solution total amount 20%.
The difference of embodiment 81-96 and embodiment 1-16 is only that the filter pressure of strainer is 0.01MPa.
The difference of embodiment 97-112 and embodiment 1-16 is only that the filter pressure of strainer is 0.03MPa.
The difference of embodiment 113-128 and embodiment 1-16 is only that the filter pressure of strainer is 0.04MPa.
The difference of embodiment 129-144 and embodiment 1-16 is only that the filter pressure of strainer is 0.05MPa.
The difference of embodiment 145-160 and embodiment 1-16 is only that the filter pressure of ultrafiltration membrance filter machine is 1MPa.
The difference of embodiment 161-176 and embodiment 1-16 is only that the filter pressure of ultrafiltration membrance filter machine is 1.5MPa.
In the present embodiment, when strainer and ultrafiltration membrance filter machine are used by serial or parallel connection, the quantity of serial or parallel connection can also be 3,4,5 etc.The non-limit part of technical scope mid point value that this place embodiment is protected application claims, equally all in the scope of protection of present invention.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although made a detailed description the present invention and quoted some specific embodiments as proof, to those skilled in the art, only otherwise it is obvious for leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (7)
1. ultra-filtration membrane is used for a cascade filtration method for electroplate liquid, and it is characterized in that, described cascade filtration method comprises the steps:
S1, common filtration: electroplate liquid obtains filtrate by metre filter;
S2, supercharging: filtrate obtained above is sent into after supercharging in ultrafiltration membrance filter machine;
S3, ultrafiltration membrance filter: in ultrafiltration membrance filter machine, filtrate obtains the permeate containing plating solution total amount 60-80% and the concentrated solution containing plating solution total amount 20-40% after filtration;
S4, circulating filtration: concentrated solution obtained above is transported in the strainer in step S1 and participates in circulating filtration.
2. a kind of ultra-filtration membrane according to claim 1 is used for the cascade filtration method of electroplate liquid, and it is characterized in that, the filtration process of strainer described in step S1 is negative pressure filtration.
3. a kind of ultra-filtration membrane according to claim 2 is used for the cascade filtration method of electroplate liquid, and it is characterized in that, the filter pressure of negative pressure filtration described in step S1 is 0.01-0.05MPa.
4. a kind of ultra-filtration membrane according to claim 1 is used for the cascade filtration method of electroplate liquid, and it is characterized in that, the filtration process of the machine of ultrafiltration membrance filter described in step S3 is positive press filtration.
5. a kind of ultra-filtration membrane according to claim 4 is used for the cascade filtration method of electroplate liquid, and it is characterized in that, the filter pressure of positive press filtration described in step S3 is 1-2MPa.
6. a kind of ultra-filtration membrane according to claim 1 is used for the cascade filtration method of electroplate liquid, it is characterized in that, strainer described in step S1 is composing in parallel of composing in parallel of being composed in series of single composition or two and above strainer or two and above strainer or two groups and above strainer and every set filter is made up of two and above positioned inline.
7. a kind of ultra-filtration membrane according to claim 1 is used for the cascade filtration method of electroplate liquid, it is characterized in that, the machine of ultrafiltration membrance filter described in step S3 is composing in parallel and often organizing ultrafiltration membrance filter machine and being composed in series by two and above ultrafiltration membrance filter machine of composing in parallel of being composed in series of single composition or two and above ultrafiltration membrance filter machine or two and above ultrafiltration membrance filter machine or two groups and above ultrafiltration membrance filter machine.
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| CN204151441U (en) * | 2014-09-04 | 2015-02-11 | 天津亚轩科技有限公司 | Leacheate recycling system after a kind of electrophoresis production line electrophoresis |
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| CN109112606A (en) * | 2018-10-24 | 2019-01-01 | 北京硕泰汇丰科技有限公司 | A method of for electroplating bath solution repeatedly positive and negative filtering step by step |
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