CN102784515B - 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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- CN102784515B CN102784515B CN201110130079.6A CN201110130079A CN102784515B CN 102784515 B CN102784515 B CN 102784515B CN 201110130079 A CN201110130079 A CN 201110130079A CN 102784515 B CN102784515 B CN 102784515B
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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, particularly relate 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 frictional force effect, enter emulsion system, form greasy filth and iron soap.These two kinds of impurity can block emulsion system associated conduit, cause fault in production or product surface quality defect.
At present, for the filtration of cold-rolling mill emulsion, the equipment such as general employing flat filter (FBF) and automatic backwashing filter (NWF), flat filter utilizes the impurity in filter-cloth filtering emulsion, and backwash filter is then carry out impurity screening by subsidiary filter core.Above two kinds of filter methods, although can remove the impurity in emulsion to a certain extent, also clearly, namely filtering accuracy and filter capacity are all very limited for its shortcoming, especially do not have very good filter effect for impurity such as the iron powders in emulsion.In addition, when the steel grade that rolling hardness is higher (as silicon steel, high-strength steel), in emulsion, can more greasy filth and iron soap be contained, be difficult to remove completely with single filters.
Publication number is CN1736906, publication date is on February 22nd, 2006, name is called that the Chinese patent literature of " 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: enter regulating reservoir A, regulating reservoir B from the emulsifying wastewater of milling train discharge by distributor box, deliver to paper tape filter A, paper tape filter B and remove impurity; 2) enter circulating box oil removing, enter pottery membrane microfiltration device and carry out loop ultrafiltration, filter liquor flows into filtrate collection pond; 3) be evacuated to neutralization pond with delivery pump to neutralize, deliver to cooling tower A, cooling tower B lowers the temperature, the water after cooling flow to bio-aeration pool and carries out biodegradation, delivers to membrane reactor after degraded, the filter liquor discharge after membrane reactor or reuse.
The processing method of the mainly emulsion oily waste water involved by technique scheme, does not comprise greasy filth in its waste liquid, and the waste water after process is emission treatment, do not need to use once again in retrieval system, therefore it mainly pays close attention to physical and chemical index again.
Summary of the invention
The object of this invention is to provide a kind of Deepened filtering method of cold mill complex emulsion, the method is by filtering technique order reasonable in design, utilize the multiple means such as electromagnetic separation and physical filtering, thus realize the impurity such as greasy filth, iron soap removing the overwhelming majority in emulsion, realize the depth-type filtration to emulsion, thus the emulsion after filtering can repetitive cycling be used.
The present invention is according to foregoing invention object, and provide a kind of Deepened filtering method of cold mill complex emulsion, it comprises the following steps: successively
(1) used for cold mill complex emulsion is pumped into a flat-panel filter, after the sticky contaminant that flat-panel filter is removed in emulsion, enter an emulsion box;
(2) emulsion in described emulsion box is carried out overflow filtration, make the impurity floating over emulsion surface enter a spill box thus;
(3) emulsion in described spill box is sent into a magnetic strength filter and a permanent magnet type filter filters further, remove the ferrous contaminants in emulsion;
(4) emulsion filtered through magnetic strength filter and permanent magnet type filter is sent back to described emulsion box;
(5) emulsion in described emulsion box is delivered to cold-rolling mill, and a backwash filter is set in the way delivering to cold-rolling mill, carry out the particle before milling train by backwash filter and filter.
It should be noted that, in order to ensure filter effect, the order of above steps must not change, technical solutions according to the invention are just by adopting different filter methods and order of steps reasonable in design, just ensure that final filter effect, make the emulsion filtered through above-mentioned steps can enter milling train again to be used, thus realize recycling of emulsion.The design principle of the technical program is specific as follows:
Containing more greasy filth and iron soap in the emulsion that cold-rolling mill frame ejects, and the impurity of bulk is more, therefore needs first to adopt flat-panel filter to filter.The filtering accuracy of flat-panel filter is low, but it is also lower to filter cost, is therefore applicable to carry out continuous filtration to the emulsion of large discharge, and the filter cloth formula of flat-panel filter is filtered and first the sticky contaminants such as greasy filth can be filtered out.
But in the emulsion of flat-panel filter filtration, still containing more iron powder and greasy filth, the feature of these impurity is that density is little, particle diameter is little.Now, the step adopting overflow to filter makes the impurity in emulsion can swim in the superiors of liquid level along with oil slick, and naturally overflows in spill box.And then adopt magnetic strength filter and permanent magnet type filter to filter the emulsion through overflow, just the filter efficiency of magnetic strength filter and permanent magnet type filter can significantly be improved, magnetic strength filter and permanent magnet type filter is avoided to filter the whole emulsions in whole emulsion box, decrease the consumption of ROLLING OIL, reduce the operating cost of system.
Why adopt in step (3) simultaneously magnetic strength filter and permanent magnet type filter carry out filtration be because, after the pressure reduction of magnetic strength filter reaches certain numerical value, can power-off be there is and to iron core self-cleaning in it, the now filtration of magnetic strength filter can temporarily be shielded, now permanent magnet type filter also runs in continuation, can not occur to leak through filter to the emulsion of overflow.
Emulsion after step (3) is filtered is got back to emulsion box, and is served milling train.The liquid supply pressure of emulsion is now very large, therefore before emulsion enters milling train, arranges a backwash filter again, the pressure of emulsion self can be relied on residual particles to be filtered.
In order to improve the efficiency with entire depth filtering technique that is filtered through of emulsion further, preferably, in described step (1), the filter cycle of flat-panel filter is 60-100min.
Preferably, the pressure reduction of described backwash filter is 0.2-1.0MPa.
Preferably, the pressure reduction of described magnetic strength filter is 0.05-0.25MPa, and the speed of described permanent magnet type filter is 10-100%.Wherein the pressure reduction of magnetic strength filter and the speed of permanent magnet type filter meet following matching relationship:
In described step (3), described ferrous contaminants comprises iron powder and iron soap.
In described step (2), described in float over emulsion surface impurity comprise iron soap and greasy filth.
The Deepened filtering method of cold mill complex emulsion of the present invention is owing to have employed technique scheme, make it can remove the impurity such as greasy filth, iron soap of the overwhelming majority in emulsion, realize the depth-type filtration to emulsion, emulsion after filtration can repetitive cycling use, this is that existing filtering technique cannot realize, thus greatly save the use amount of cold mill complex emulsion, significantly can save production cost for manufacturer.This Deepened filtering method is by improving filtering accuracy simultaneously, also overcomes that cold rolling production unit emulsion greasy filth is many, the susceptible to plugging problem of system pipeline, substantially increases the board surface quality of band steel simultaneously.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the filtration system that the Deepened filtering method of cold mill complex emulsion of the present invention adopts.
Fig. 2 is the FB(flow block) of the Deepened filtering method of cold mill complex emulsion of the present invention.
Detailed description of the invention
As shown in Figure 1, this filtration system in the present embodiment, is adopted to carry out depth-type filtration to cold mill complex, wherein:
Emulsion box and spill box are integral type structure, and it is full steel structure, and centre is opened by a baffle for separating, be equipped with mixer and heating system in emulsion box and spill box;
Flat filter is primarily of filter cloth and filter pipe composition, emulsion passes through by filter cloth, impurity (being mainly the goo such as greasy filth, greasy filth) is sticked by filter cloth, when the impurity that filter cloth sticks reaches certain level, emulsion cannot pass through smoothly, pressure reduction trigger differential pressure pickup is produced to filter cloth, by compressed air, the impurities purging on filter cloth is clean thus start next one filter cycle.
The filter core of high gradient magnetic strength filter (DEM) produces magnetic in the energized state, emulsion flows through by filter core, impurity (being mainly the iron powder in emulsion and iron soap) is adsorbed by filter core, when impurities accumulation to a certain extent after, trigger differential pressure pickup, filter core power-off, pours in cesspit by steam and filtered water by the impurity be attached on filter core, iron core is energized again afterwards, starts next filter cycle.
Permanent magnet type filter is primarily of Permanentmagnet bar and mud-scraping apparatus composition, pass through in the circulation that emulsion is made up of Permanentmagnet bar, impurity (being mainly the iron powder in emulsion and iron soap) is wherein adsorbed by bar magnet, and the impurity of constantly absorption then scrapes in sludge tank by with the matching used scraper of bar magnet.
According to step as shown in Figure 2, the emulsion in collection box is filtered:
(1) used for cold mill complex emulsion is pumped into flat-panel filter, after the sticky contaminant that flat-panel filter is removed in emulsion, enter emulsion box;
(2) emulsion in emulsion box is carried out overflow filtration, make the impurity floating over emulsion surface enter spill box thus;
(3) the emulsion feeding magnetic strength filter in spill box and permanent magnet type filter are filtered further, remove the ferrous contaminants in emulsion;
(4) emulsion filtered through magnetic strength filter and permanent magnet type filter is sent back to emulsion box;
(5) emulsion in emulsion box is delivered to cold-rolling mill, and a backwash filter is set in the way delivering to cold-rolling mill, carry out the particle before milling train by backwash filter and filter.
In the embodiment 1-5 of the technical program, the technological parameter of each step is as shown in table 1.
Table 1.
Inventor carries out test to the filter result of embodiment 1-5 and obtains, this emulsion after the method is filtered, its iron content remains on below 140ppm substantially, and ash content remains on below 300ppm, can meet the use needs that great surface quality requirement product produced by milling train completely.
That enumerates it should be noted that above is only specific embodiments of the invention, obviously the invention is not restricted to above embodiment, has many similar changes thereupon.If all distortion that those skilled in the art directly derives from content disclosed by the invention or associates, protection scope of the present invention all should be belonged to.
Claims (5)
1. a Deepened filtering method for cold mill complex emulsion, is characterized in that, comprises the following steps: successively
(1) used for cold mill complex emulsion is pumped into a flat-panel filter, after the sticky contaminant that flat-panel filter is removed in emulsion, enter an emulsion box;
(2) emulsion in described emulsion box is carried out overflow filtration, make the impurity floating over emulsion surface enter a spill box thus;
(3) emulsion in described spill box is sent into a magnetic strength filter and a permanent magnet type filter filters further, remove the ferrous contaminants in emulsion;
(4) emulsion filtered through magnetic strength filter and permanent magnet type filter is sent back to described emulsion box;
(5) emulsion in described emulsion box is delivered to cold-rolling mill, and a backwash filter is set in the way delivering to cold-rolling mill, carry out the particle before milling train by backwash filter and filter; Wherein
The pressure reduction of described magnetic strength filter is 0.05-0.25MPa, and the speed of described permanent magnet type filter is 10-100%; The pressure reduction of described magnetic strength filter and the speed of permanent magnet type filter meet following matching relationship:
When the pressure reduction of magnetic strength filter is 0.05MPa, correspondingly, the speed V of permanent magnet type filter is 10%≤V < 30%;
When the pressure reduction of magnetic strength filter is 0.10MPa, correspondingly, the speed V of permanent magnet type filter is 30%≤V < 50%;
When the pressure reduction of magnetic strength filter is 0.15MPa, correspondingly, the speed V of permanent magnet type filter is 50%≤V < 70%;
When the pressure reduction of magnetic strength filter is 0.20MPa, correspondingly, the speed V of permanent magnet type filter is 70%≤V < 90%;
When the pressure reduction of magnetic strength filter is 0.25MPa, correspondingly, the speed V of permanent magnet type filter is 90%≤V≤100%.
2. the Deepened filtering method of cold mill complex emulsion as claimed in claim 1, it is characterized in that, in described step (1), the filter cycle of flat-panel filter is 60-100min.
3. the Deepened filtering method of cold mill complex emulsion as claimed in claim 1, is characterized in that, in described step (2), described in float over emulsion surface impurity comprise iron soap and greasy filth.
4. the Deepened filtering method of cold mill complex emulsion as claimed in claim 1, it is characterized in that, in described step (3), described ferrous contaminants comprises iron powder and iron soap.
5. the Deepened filtering method of cold mill complex emulsion as claimed in claim 1 or 2, it is characterized in that, in described step (5), the pressure reduction of described backwash filter is 0.2-1.0MPa.
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| CN201110130079.6A CN102784515B (en) | 2011-05-19 | 2011-05-19 | Deep filtration method of emulsion used by cold-rolling unit |
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| CN102784515B true CN102784515B (en) | 2015-04-22 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191600B (en) * | 2013-04-09 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Filtering method of rolling oil filtering system of rolling mill |
| CN104801102B (en) * | 2014-01-23 | 2017-02-01 | 宝山钢铁股份有限公司 | Cold rolling emulsion purification system |
| 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 |
| 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 |
| CN112691789B (en) * | 2020-12-21 | 2023-02-03 | 中冶南方工程技术有限公司 | Cold-rolled emulsion filtering system and method considering multiple series of products |
| CN112807840B (en) * | 2020-12-31 | 2022-05-27 | 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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