CN102784515A - Deep filtration method of emulsion used by cold-rolling unit - Google Patents
Deep filtration method of emulsion used by cold-rolling unit Download PDFInfo
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- CN102784515A CN102784515A CN2011101300796A CN201110130079A CN102784515A CN 102784515 A CN102784515 A CN 102784515A CN 2011101300796 A CN2011101300796 A CN 2011101300796A CN 201110130079 A CN201110130079 A CN 201110130079A CN 102784515 A CN102784515 A CN 102784515A
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Abstract
The invention discloses a deep filtration method of an emulsion used by a cold-rolling unit. The deep filtration method comprises the following steps of pumping an emulsion used by a cold-rolling unit into a flat plate filter, removing sticky impurities in the emulsion by the flat plate filter, feeding the emulsion without the sticky impurities into an emulsion tank, carrying out overflow filtration of the emulsion in the emulsion tank so that impurities floating on the surface of the emulsion enter into an overflow tank, feeding the emulsion in the overflow tank into a magnetic induction filter and a permanent magnet-type filter, carrying out further filtration so that iron-containing impurities in the emulsion are removed, feeding back the emulsion filtered by the magnetic induction filter and the permanent magnet-type filter into the emulsion tank, feeding the emulsion in the emulsion tank into a cold-rolling machine, wherein a backwash filter is arranged in a passage for conveying the emulsion to the cold-rolling machine, and filtering the emulsion by the backwash filter to remove particles before the emulsion enters into the cold-rolling machine.
Description
Technical field
The present invention relates to a kind of mixed liquor filter method, relate in particular to a kind of emulsion filter method.
Background technology
Cold-strip needs to use emulsion to carry out technological lubrication in the operation of rolling.In plastic history, band steel and roll can produce tiny iron powder under the frictional force effect, get into emulsion system, form greasy filth and iron soap.These two kinds of impurity can stop up the emulsion system associated conduit, cause production fault or product surface quality defective.
At present; Filtration for the cold-rolling mill emulsion; General flat filter (FBF) and the automatic backwashing filter equipment such as (NWF) of adopting, flat filter utilizes filter cloth to filter the impurity in the emulsion, and backwash filter then is to come impurity screening through subsidiary filter core.More than two kinds of filter methods, though can remove the impurity in the emulsion to a certain extent, its shortcoming also clearly, promptly filtering accuracy and filter capacity are all very limited, especially do not have very good filter effect for the impurity such as iron powder in the emulsion.In addition, when the higher steel grade of rolling hardness (like silicon steel, high-strength steel), can contain more greasy filth and iron soap in the emulsion, be difficult to remove fully with single filtration means.
Publication number is CN1736906; Open day is on February 22nd, 2006; The Chinese patent document that name is called " method of cold rolling emulsion wastewater treatment and system thereof " discloses a kind of method of cold rolling emulsion wastewater treatment; It comprises the steps: 1) coarse filtration: get into regulating reservoir A, regulating reservoir B from the emulsifying wastewater of milling train discharging by distributor box, deliver to paper tape filter A, paper tape filter B removes impurity; 2) get into the circulating box oil removing, get into the ceramic membrane ultrafitration device and carry out loop ultrafiltration, filter liquor flows into the filter liquor collecting pit; 3) be evacuated to neutralization pond with delivery pump and neutralize, deliver to cooling tower A, cooling tower B lowers the temperature, the water after the cooling flow to the bio-aeration pool biodegrade, delivers to membrane reactor after the degraded, filter liquor discharging or reuse behind membrane reactor.
What technique scheme was related mainly is the processing method of emulsion oily waste water, does not comprise greasy filth in its waste liquid, and the waste water after handling is emission treatment, does not need to use once again in the retrieval system, so it mainly pays close attention to physical and chemical index again.
Summary of the invention
The Deepened filtering method that the purpose of this invention is to provide a kind of cold rolling unit emulsion; This method is through filtering technique order reasonable in design; Utilize multiple means such as electromagnetic separation and physical filtering; Thereby realize removing impurity such as greasy filth most in the emulsion, iron soap, realize depth-type filtration, thereby but make the emulsion repetitive cycling after filtering use emulsion.
The present invention provides a kind of Deepened filtering method of cold rolling unit emulsion according to the foregoing invention purpose, and it comprises the following steps: successively
(1) the used emulsion of cold rolling unit is pumped into a flat-panel filter, after flat-panel filter is removed the sticky contaminant in the emulsion, get into an emulsion box;
(2) emulsion in the said emulsion box is carried out overflow and filter, make the impurity that floats over the emulsion surface get into a spill box thus;
(3) emulsion in the said spill box is sent into a magnetic strength filter and a permanent magnet formula filter further filters, remove the ferrous contaminants in the emulsion;
(4) will pass through the emulsion that magnetic strength filter and permanent magnet formula filter filter and send back to said emulsion box;
(5) emulsion in the said emulsion box is delivered to cold-rolling mill, and in delivering to the way of cold-rolling mill, a backwash filter is set, the particle of being gone into before the milling train by backwash filter filters.
Need to prove; In order to guarantee filter effect; The order of above-mentioned each step must not change, and technical scheme of the present invention through adopting different filter methods and order of steps reasonable in design, has just guaranteed final filter effect just; The emulsion that makes the process above-mentioned steps filter can get into milling train and be used once more, thereby realizes the recycle of emulsion.Present technique design for scheme principle is specific as follows:
Contain more greasy filth and iron soap in the emulsion that cold-rolling mill frame ejects, and the impurity of bulk is more, therefore need at first adopts flat-panel filter to filter.The filtering accuracy of flat-panel filter is low, but it is also lower to filter cost, therefore is applicable to that the emulsion to big flow carries out continuous filtration, and the filter cloth formula of flat-panel filter is filtered and can sticky contaminants such as greasy filth at first be filtered out.
Yet in the emulsion through the flat-panel filter filtration, still contain more iron powder and greasy filth, the characteristics of these impurity are that density is little, particle diameter is little.At this moment, the step that adopts overflow to filter makes the impurity in the emulsion can swim in the superiors of liquid level along with oil slick, and overflows in the spill box naturally.And then adopt magnetic strength filter and permanent magnet formula filter that the emulsion through overflow is filtered; Just can significantly improve the filter efficiency of magnetic strength filter and permanent magnet formula filter; Avoid magnetic strength filter and permanent magnet formula filter that the whole emulsions in the whole emulsion box are filtered; Reduce the consumption of ROLLING OIL, reduced the operating cost of system.
Why adopt magnetic strength filter and permanent magnet formula filter to filter in the step (3) simultaneously to be because; After the pressure reduction of magnetic strength filter reaches certain numerical value; It can take place the outage and to the iron core self-cleaning; This moment, the filtration meeting of magnetic strength filter was shielded by temporary transient, and this moment, permanent magnet formula filter also continued operation, can not take place the emulsion of overflow is leaked filtration.
The emulsion that will pass through after step (3) is filtered is got back to emulsion box, and is served milling train.The liquid supply pressure of the emulsion of this moment is very big, therefore before emulsion gets into milling train, a backwash filter is set again, can rely on the pressure of emulsion self that residual particles is filtered.
For the further filtration process of emulsion and the efficient of entire depth filtering technique of improving, preferably, in the said step (1), be 60-100min the filter cycle of flat-panel filter.
Preferably, the pressure reduction of said backwash filter is 0.2-1.0MPa.
Preferably, the pressure reduction of said magnetic strength filter is 0.05-0.25MPa, and the speed of said permanent magnet formula filter is 10-100%.Wherein the speed of the pressure reduction of magnetic strength filter and permanent magnet formula filter satisfies following matching relationship:
In the said step (3), said ferrous contaminants comprises iron powder and iron soap.
In the said step (2), the said impurity that floats over the emulsion surface comprises iron soap and greasy filth.
The Deepened filtering method of cold rolling unit emulsion of the present invention is owing to adopted technique scheme; Make it can remove impurity such as the greasy filth of the overwhelming majority in the emulsion, iron soap; Realization is to the depth-type filtration of emulsion, but the emulsion repetitive cycling after the filtration use, this be existing filtering technique can't realize; Thereby saved the use amount of cold rolling unit emulsion greatly, can significantly save production cost for manufacturer.This Deepened filtering method has also overcome many, the susceptible to plugging problem of system pipeline of cold rolling production unit emulsion greasy filth through improving filtering accuracy simultaneously, has improved the plate face quality of band steel simultaneously greatly.
Description of drawings
Fig. 1 is the structured flowchart of the filtration system that Deepened filtering method adopted of cold rolling unit emulsion of the present invention.
Fig. 2 is the FB(flow block) of the Deepened filtering method of cold rolling unit emulsion of the present invention.
The specific embodiment
As shown in Figure 1, adopt this filtration system that cold rolling unit is carried out depth-type filtration in the present embodiment, wherein:
Emulsion box and spill box are integral structure, and it is a full steel structure, and the centre is separated by a dividing plate,, be equipped with mixer and heating system in emulsion box and the spill box;
Flat filter mainly is made up of filter cloth and filter pipe; Emulsion is by passing through on the filter cloth; Impurity (being mainly goos such as greasy filth, greasy filth) is sticked by filter cloth, and when the impurity that sticks when filter cloth reached certain level, emulsion can't pass through smoothly; Filter cloth is produced pressure reduction and triggers differential pressure pickup, thereby the impurity on the filter cloth is purged clean the beginning next filter cycle by compressed air.
The filter core of high gradient magnetic strength filter (DEM) produces magnetic under "on" position, emulsion is by flowing through in the filter core, and impurity (being mainly iron powder and iron soap in the emulsion) is adsorbed by filter core; After impurities accumulation arrives to a certain degree; Trigger differential pressure pickup, the filter core outage, the impurity that will be attached on the filter core with steam and filtered water pours in the cesspit; Iron core is switched on once more afterwards, begins next filter cycle.
Permanent magnet formula filter mainly is made up of Permanentmagnet bar and mud-scraping apparatus; Pass through in the circulation that emulsion is made up of Permanentmagnet bar; Impurity wherein (being mainly iron powder and iron soap in the emulsion) is by bar magnet absorption, and constantly the impurity of absorption is then by scraping in the sludge tank with the matching used scraper of bar magnet.
According to step as shown in Figure 2 emulsion in the collection box is filtered:
(1) the used emulsion of cold rolling unit is pumped into flat-panel filter, after flat-panel filter is removed the sticky contaminant in the emulsion, get into emulsion box;
(2) emulsion in the emulsion box is carried out overflow and filter, make the impurity that floats over the emulsion surface get into spill box thus;
(3) emulsion in the spill box is sent into the magnetic strength filter and permanent magnet formula filter further filters, remove the ferrous contaminants in the emulsion;
(4) will pass through the emulsion that magnetic strength filter and permanent magnet formula filter filter and send back to emulsion box;
(5) emulsion in the emulsion box is delivered to cold-rolling mill, and in delivering to the way of cold-rolling mill, a backwash filter is set, the particle of being gone into before the milling train by backwash filter filters.
The technological parameter of each step is as shown in table 1 among the embodiment 1-5 of present technique scheme.
Table 1.
The inventor tests the filter result of embodiment 1-5 and obtains; Through this emulsion after this method filtration; Its iron content remains on below the 140ppm basically, and ash content remains on below the 300ppm, can satisfy the use needs that milling train is produced great surface quality requirement product fully.
Be noted that above enumerate be merely specific embodiment of the present invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (7)
1. the Deepened filtering method of a cold rolling unit emulsion is characterized in that, comprises the following steps: successively
(1) the used emulsion of cold rolling unit is pumped into a flat-panel filter, after flat-panel filter is removed the sticky contaminant in the emulsion, get into an emulsion box;
(2) emulsion in the said emulsion box is carried out overflow and filter, make the impurity that floats over the emulsion surface get into a spill box thus;
(3) emulsion in the said spill box is sent into a magnetic strength filter and a permanent magnet formula filter further filters, remove the ferrous contaminants in the emulsion;
(4) will pass through the emulsion that magnetic strength filter and permanent magnet formula filter filter and send back to said emulsion box;
(5) emulsion in the said emulsion box is delivered to cold-rolling mill, and in delivering to the way of cold-rolling mill, a backwash filter is set, the particle of being gone into before the milling train by backwash filter filters.
2. the Deepened filtering method of cold rolling unit emulsion as claimed in claim 1 is characterized in that, in the said step (1), be 60-100min the filter cycle of flat-panel filter.
3. the Deepened filtering method of cold rolling unit emulsion as claimed in claim 1 is characterized in that, in the said step (2), the said impurity that floats over the emulsion surface comprises iron soap and greasy filth.
4. the Deepened filtering method of cold rolling unit emulsion as claimed in claim 1 is characterized in that, in the said step (3), said ferrous contaminants comprises iron powder and iron soap.
5. according to claim 1 or claim 2 the Deepened filtering method of cold rolling unit emulsion is characterized in that in the said step (3), the pressure reduction of said magnetic strength filter is 0.05-0.25MPa, and the speed of said permanent magnet formula filter is 10-100%.
6. according to claim 1 or claim 2 the Deepened filtering method of cold rolling unit emulsion is characterized in that in the said step (5), the pressure reduction of said backwash filter is 0.2-1.0MPa.
7. the Deepened filtering method of cold rolling unit emulsion as claimed in claim 5; It is characterized in that; The speed of the pressure reduction of said magnetic strength filter and permanent magnet formula filter satisfies following matching relationship: when the pressure reduction of magnetic strength filter is 0.05MPa; Correspondingly, the speed of permanent magnet formula filter is 10-30%;
When the pressure reduction of magnetic strength filter was 0.10MPa, correspondingly, the speed of permanent magnet formula filter was 30-50%;
When the pressure reduction of magnetic strength filter was 0.15MPa, correspondingly, the speed of permanent magnet formula filter was 50-70%;
When the pressure reduction of magnetic strength filter was 0.20MPa, correspondingly, the speed of permanent magnet formula filter was 70-90%;
When the pressure reduction of magnetic strength filter was 0.25MPa, correspondingly, the speed of permanent magnet formula filter was 90-100%.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191600A (en) * | 2013-04-09 | 2013-07-10 | 山西太钢不锈钢股份有限公司 | Filtering method of rolling oil filtering system of rolling mill |
| CN104801102A (en) * | 2014-01-23 | 2015-07-29 | 宝山钢铁股份有限公司 | Cold rolling emulsion purification system |
| CN105665542A (en) * | 2016-03-31 | 2016-06-15 | 苏州三维精密机械有限公司 | Deep drawing progressive die continuous stamping, cooling and lubricating system |
| CN106110730A (en) * | 2016-08-24 | 2016-11-16 | 苏州依斯倍环保装备科技有限公司 | Emulsion reuse integrating device |
| CN106281635A (en) * | 2015-05-27 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of silicon steel cold-rolling emulsion greasy filth reclaims method of purification |
| CN106425873A (en) * | 2016-10-13 | 2017-02-22 | 新野鼎泰电子精工科技有限公司 | Centralized filtration and oil supply system for machine tool machining |
| CN106680134A (en) * | 2015-12-30 | 2017-05-17 | 奎克化学（中国）有限公司 | Method for determining iron soap content in emulsion |
| CN107966043A (en) * | 2018-01-17 | 2018-04-27 | 酷仑冷却技术（上海）有限公司 | A kind of adiabatic closed cooling system for the cooling of welded pipe production line emulsion |
| CN108659945A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of Magnetic filter formula impurity treatment method of cold mill complex emulsion |
| CN112657675A (en) * | 2020-10-22 | 2021-04-16 | 无锡宝顺不锈钢有限公司 | Emulsion filtering process for cold rolling unit |
| CN112691789A (en) * | 2020-12-21 | 2021-04-23 | 中冶南方工程技术有限公司 | Cold-rolled emulsion filtering system and method considering multiple series of products |
| CN112807840A (en) * | 2020-12-31 | 2021-05-18 | 飞潮（无锡）过滤技术有限公司 | Recovery of Fe3O4Nano particle filtering and separating system and method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191600A (en) * | 2013-04-09 | 2013-07-10 | 山西太钢不锈钢股份有限公司 | Filtering method of rolling oil filtering system of rolling mill |
| CN104801102A (en) * | 2014-01-23 | 2015-07-29 | 宝山钢铁股份有限公司 | Cold rolling emulsion purification system |
| CN104801102B (en) * | 2014-01-23 | 2017-02-01 | 宝山钢铁股份有限公司 | Cold rolling emulsion purification system |
| CN106281635A (en) * | 2015-05-27 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of silicon steel cold-rolling emulsion greasy filth reclaims method of purification |
| CN106281635B (en) * | 2015-05-27 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of silicon steel cold-rolling emulsion greasy filth recycling method of purification |
| CN106680134A (en) * | 2015-12-30 | 2017-05-17 | 奎克化学（中国）有限公司 | Method for determining iron soap content in emulsion |
| CN105665542A (en) * | 2016-03-31 | 2016-06-15 | 苏州三维精密机械有限公司 | Deep drawing progressive die continuous stamping, cooling and lubricating system |
| CN106110730A (en) * | 2016-08-24 | 2016-11-16 | 苏州依斯倍环保装备科技有限公司 | Emulsion reuse integrating device |
| CN106425873A (en) * | 2016-10-13 | 2017-02-22 | 新野鼎泰电子精工科技有限公司 | Centralized filtration and oil supply system for machine tool machining |
| CN108659945B (en) * | 2017-03-30 | 2021-08-17 | 宝山钢铁股份有限公司 | Magnetic filtration type impurity treatment method for cold rolling unit emulsion |
| CN108659945A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of Magnetic filter formula impurity treatment method of cold mill complex emulsion |
| CN107966043A (en) * | 2018-01-17 | 2018-04-27 | 酷仑冷却技术（上海）有限公司 | A kind of adiabatic closed cooling system for the cooling of welded pipe production line emulsion |
| CN107966043B (en) * | 2018-01-17 | 2023-11-07 | 酷仑冷却技术（上海）有限公司 | Adiabatic closed cooling system for emulsion cooling of welded pipe production line |
| CN112657675A (en) * | 2020-10-22 | 2021-04-16 | 无锡宝顺不锈钢有限公司 | Emulsion filtering process for cold rolling unit |
| CN112691789A (en) * | 2020-12-21 | 2021-04-23 | 中冶南方工程技术有限公司 | Cold-rolled emulsion filtering system and method considering multiple series of products |
| CN112807840A (en) * | 2020-12-31 | 2021-05-18 | 飞潮（无锡）过滤技术有限公司 | Recovery of Fe3O4Nano particle filtering and separating system and method |
| WO2022142363A1 (en) * | 2020-12-31 | 2022-07-07 | 飞潮（无锡）过滤技术有限公司 | Filtration and separation system and method for recovering fe3o4 nanoparticles |
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