CN101716440A - Method for liquid filtration - Google Patents
Method for liquid filtration Download PDFInfo
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- CN101716440A CN101716440A CN200910312236A CN200910312236A CN101716440A CN 101716440 A CN101716440 A CN 101716440A CN 200910312236 A CN200910312236 A CN 200910312236A CN 200910312236 A CN200910312236 A CN 200910312236A CN 101716440 A CN101716440 A CN 101716440A
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- liquid
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- slag
- filtrate
- backwash
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Abstract
The invention relates to a method for liquid filtration and belongs to the field of separation. The invention aims to solve a technical problem of providing a liquid filtration method that can improve liquid filtration efficiency. The method for liquid filtration comprises the following steps: allowing raw liquid to enter a filter from a raw liquid inlet pipe of the filter to be filtered by a filter element or filter membrane and obtaining filtrate and slag liquid, wherein the filtrate is discharged from a filtrate discharge pipe, and the slag liquid is discharged from a slag liquid discharge pipe; and hermetically sealing the outlet of the slag liquid discharge pipe by using a liquid seal device and discharging the slag liquid into the liquid seal device from the slag liquid discharge pipe. The method prevents the air from entering the filter, so that the air does not undergo chemical reaction with the substances in the filter and the filtration effect is improved. The method of the invention can synchronously realize production and backwashing and avoids external power supply during backwashing. In the method of the invention, the liquid in the filter generates a concentration gradient during backwashing, so the backwashing is more complete.
Description
Technical field
The present invention relates to liquid filtration method, belong to separation field.
Background technology
TiCl
4Be the intermediate material of producing titanium sponge and titanium white, the method preparation of industrial main employing chlorination high titanium slag.Owing to be subjected to the influence of high titanium slag purity and chlorination process, the thick TiCl that this direct chlorination obtains
4Liquid contains a large amount of solid particles that contains Fe, Al and Mg salt usually, can influence the quality of follow-up titanium sponge or titanium white.Therefore, need be to this thick TiCl
4Suspension carries out Separation of Solid and Liquid.
At present, to thick TiCl
4The Separation of Solid and Liquid of carrying out suspension mainly adopts cloth bag to filter.But the cloth bag filtration has following defective: the filtering accuracy of cloth bag filtration is low, has influenced TiCl
4The quality of filtrate causes postorder to improve expensive in the quality deep-processing process; Cloth bag adheres to TiCl easily
4Solid particle in the suspension simultaneously because cloth bag can not carry out backwash regeneration, causes its filtration flux to decay significantly in a short time and lost efficacy, and has had a strong impact on thick TiCl
4The filter efficiency of suspension; After cloth bag lost efficacy, the back that needs to stop production was to the filter element dismounting and change, and frequent replacing causes a large amount of TiCl
4Hydrolysis, produce a large amount of HCl gas, thereby cause serious environmental to be polluted.
Adopt metal filtration film (or filter core) to filter and to improve TiCl
4The quality of filtrate, and can carry out backwash after metal filtration film (or filter core) obstruction, can continue after the backwash to use, needn't change.Therefore, adopt metal filtration film (or filter core) to filter the trend that replaces the cloth bag filtration is gradually arranged.
Adopt metal filtration film (or filter core) to filter and mainly comprise stoste inlet pipeline (stoste is the liquid before not filtering), filter core (or filter membrane), filtrate discharge line, slag liquid discharge line, because the aperture of filter core or filter membrane is less, enter obstruction filter core or filter membrane for fear of air, filter needs sealing when filtering, enter to prevent gas.When filtering, slag liquid discharge line is in closed condition, when slag liquid is accumulated to when a certain amount of, stops to filter, and opens slag liquid discharge line and discharges slag liquid, and the air in the discharge filter is closed slag liquid discharge line then, filters next time again.During long-time the filtration, filter core or filter membrane stop up easily, need carry out backwash to it, at present, the method for backwash filter core or filter membrane is mainly: backwash liquor enters from the filtrate discharge line by extra power, back flush filter membrane or filter core, the backwash liquor flushing is attached to the solid particle on filter membrane or the filter core, obtains slip, and slip is discharged (its process chart is seen Fig. 1) by slag liquid discharge line.After the backwash, also need the air in the discharge filter, otherwise bubble stops up filter membrane or filter core easily.
Summary of the invention
Technical problem to be solved by this invention provides a kind of liquid filtration method, and this method can improve liquid filtering efficient
Liquid filtration method of the present invention comprises the steps: that stoste is entered by the stoste inlet pipeline of filter, through filter core or membrane filtration, obtains filtrate and slag liquid; Gained filtrate is discharged through the filtrate discharge line, and gained slag liquid is discharged through slag liquid discharge line; Wherein, by liquid seal device hermetic seal is carried out in the outlet of slag liquid discharge line, slag liquid enters in the liquid seal device through slag liquid discharge line.
Employing the inventive method is filtered, and when slag liquid is accumulated to when a certain amount of, stops to filter, and opens slag liquid discharge line and discharges slag liquid, closes slag liquid discharge line then, can proceed to filter.Because hermetic seal is carried out in the outlet of slag liquid discharge line, also avoided air enter with filter in material generation chemical reaction.
Further, liquid filtration method of the present invention also comprises backwash filter core or filter membrane step, during backwash, the stoste inlet pipeline is closed, by liquid seal device hermetic seal is carried out in the outlet of slag liquid discharge line, backwash liquor obtains slip through filtrate discharge line back flush filter membrane or filter core, and slip is entered in the liquid seal device by slag liquid discharge line.Because liquid seal device carries out hermetic seal to the outlet of slag liquid discharge line, can make the liquid level in the filter keep certain altitude, backwash liquor is during from filtrate discharge line back flush filter membrane or filter core, the backwash liquid measure that enters in the filter equates with the slip amount of discharging substantially, realized that backwash and deslagging are synchronous, improved backwash efficiency.And can form concentration gradient during backwash, make the bigger slag liquid level of proportion in the below, the preferential discharge makes filter membrane or filter core backwash more thorough.
Further, in order to enhance productivity, the use in parallel of many filters can be carried out parallel connection with 〉=2 filters, the stoste inlet pipeline of each filter is parallel to stoste intake header road, and the filtrate discharge line is parallel to filtrate discharge header road.
Further,, then can increase sealing process, also can increase the consumption of liquid seal device, be unfavorable for saving cost if with liquid seal device the slag liquid discharge line of the filter of parallel connection is carried out hermetic seal respectively.The method that aforesaid liquid filters, preferably the slag liquid discharge line with each filter is parallel to slag liquid discharge header road, only the outlet in slag liquid discharge header road is carried out hermetic seal with liquid seal device and gets final product.
Wherein, liquid filtration method of the present invention during with the use in parallel of many filters, also comprises backwash filter core or filter membrane step, and during backwash, at least one filter is in the backwash state, and the stoste inlet pipeline that is in the filter of backwash state is closed; At least one filter is in the filtration state, and gained filtrate is all or part of to be in the filter membrane or the filter core of the filter of backwash state through filtrate discharge header road back flush, obtains slip, and slip is discharged by slag liquid discharge header road.
With many filters are in parallel when using, can be simultaneously when filtering the filter core or the filter membrane of certain filter be carried out backwash.If just two filter uses in parallel, need close or the outlet in semi-closed filtrate discharge header road, because two filtrate discharge lines link to each other, the direct back flush of filtrate that is in the filter of filtration state is in the filter membrane or the filter core of the filter of backwash state, do not need additionally to provide power, save energy consumption cost, and also do not needed to discharge the air operation after the backwash.In parallel constantly more when filter, because flow of filtrate is bigger, do not need to close or the outlet of semi-closed filtrate discharge line can be carried out backwash to the filter core or the filter membrane of certain filter, when producing, can carry out backwash to each filter in turn.
Wherein, the liquid in the above-mentioned liquid seal device should be selected not the liquid with slag liquid or slip generation chemical reaction.Liquid in the liquid seal device and slag liquid or slip generation chemical reaction and influence production, the liquid in the above-mentioned liquid seal device are preferably identical with the institute filtered liquid.As when filtering titanium tetrachloride since water can with titanium tetrachloride generation hydrolysis, the liquid in the liquid seal device preferably adopts titanium tetrachloride.
Wherein, need the liquid, particularly poor stability of liquid-solid separation, liquid easy and air generation chemical reaction can adopt the inventive method to filter, as: the filtration of the titanium tetrachloride liquid of industrial production.
The inventive method has following beneficial effect:
1, do not need behind the inventive method deslagging to increase extra discharge air operation, improved production efficiency, also reduced energy consumption, economize on resources;
2, the inventive method avoided air enter with filter in material generation chemical reaction, improved filter effect;
3, the inventive method can realize producing with backwash and carry out synchronously, does not also need additionally to provide power during backwash;
4, the liquid in the filter forms concentration gradient during the inventive method backwash, makes backwash more thorough.
Description of drawings
Fig. 1 is the process chart of existing filter method;
Fig. 2 is the structural representation of the inventive method filter device therefor;
Fig. 3 is the structural formula intention after the parallel connection of the inventive method filter device therefor;
Mark among the figure, 1 is the stoste inlet pipeline, and 1a is stoste intake header road, and 2 is the filtrate discharge line, and 2a is filtrate discharge header road, and 3 is slag liquid discharge line, and 3a is slag liquid discharge header road, and 4 is filter, and 5 is filter core or filter membrane, and 6 is valve, and 7 is liquid seal device.
The specific embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is further described, does not therefore limit the present invention among the described scope of embodiments.
Adopt the inventive method to filter titanium tetrachloride liquid, the structural representation of filter device therefor 4 as shown in Figure 2.The outlet of the slag liquid discharge line 3 among the figure is carried out hermetic seal by liquid seal device 7.During filtration, titanium tetrachloride stoste is entered by the stoste inlet pipeline 1 of filter 4, filters through filter core or filter membrane 5, obtains filtrate and slag liquid; Gained filtrate is discharged through filtrate discharge line 2, and gained slag liquid enters in the liquid seal device 7 through slag liquid discharge line 3.During backwash, close stoste inlet pipeline 1, backwash liquor obtains slip through filtrate discharge line 3 back flush filter membranes or filter core 5, and slip is entered in the liquid seal device 7 by slag liquid discharge line 3.
Adopt the inventive method to filter titanium tetrachloride liquid, the structural representation of filter device therefor 4 as shown in Figure 3.3 filters, 4 in parallel uses among the figure, the stoste inlet pipeline 1 of filter 4, filtrate discharge line 2 and slag liquid discharge line 3 carry out parallel connection respectively and obtain stoste intake header road 1a, filtrate discharge header road 2a and slag liquid discharge header road 3a, and carry out hermetic seal by the outlet of 7 pairs of slag liquid of liquid seal device discharge header road 3a.During filtration, titanium tetrachloride stoste is entered by the stoste inlet pipeline 1 of filter 4, filters through filter core or filter membrane 5, obtains filtrate and slag liquid; Gained filtrate is discharged through filtrate discharge header road 2a, and gained slag liquid enters in the liquid seal device 7 through slag liquid discharge header road 3a.During backwash, at least one filter 4 is in the backwash state, and the stoste inlet pipeline 1 that is in the filter 4 of backwash state is closed; At least one filter 4 is in the filtration state, and gained filtrate is all or part of to be in the filter membrane or the filter core of the filter 4 of backwash state through filtrate discharge header road 2a back flush, obtains slip, and slip is entered in the liquid seal device 7 by slag liquid discharge header road 3a.
Claims (7)
1. liquid filtration method comprises the steps: that stoste is entered by the stoste inlet pipeline of filter, through filter core or membrane filtration, obtains filtrate and slag liquid; Gained filtrate is discharged through the filtrate discharge line, and gained slag liquid is discharged through slag liquid discharge line, it is characterized in that also comprising the steps: by liquid seal device hermetic seal to be carried out in the outlet of slag liquid discharge line, and slag liquid enters in the liquid seal device through slag liquid discharge line.
2. liquid filtration method according to claim 1, it is characterized in that: also comprise backwash filter core or filter membrane step, during backwash, close the stoste inlet pipeline, seal by the outlet of liquid seal device slag liquid discharge line, backwash liquor obtains slip through filtrate discharge line back flush filter membrane or filter core, and slip is entered in the liquid seal device by slag liquid discharge line.
3. liquid filtration method according to claim 1 is characterized in that: 〉=2 filter is carried out parallel connection, and the stoste inlet pipeline of each filter is parallel to stoste intake header road, and the filtrate discharge line is parallel to filtrate discharge header road.
4. liquid filtration method according to claim 3 is characterized in that: the slag liquid discharge line of each filter is parallel to slag liquid discharge header road, and with liquid seal device hermetic seal is carried out in the outlet in slag liquid discharge header road.
5. according to claim 3 or 4 described liquid filtration method, it is characterized in that: also comprise backwash filter core or filter membrane step, during backwash, at least one filter is in the backwash state, and the stoste inlet pipeline that is in the filter of backwash state is closed; At least one filter is in the filtration state, and gained filtrate is all or part of to be in the filter membrane or the filter core of the filter of backwash state through filtrate discharge header road back flush, obtains slip, and slip is entered in the liquid seal device by slag liquid discharge header road.
6. according to each described liquid filtration method of claim 1～5, it is characterized in that: the liquid in the liquid seal device is identical with the institute filtered liquid.
7. liquid filtration method according to claim 6 is characterized in that: institute's filtered liquid is a titanium tetrachloride liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910312236A CN101716440A (en) | 2009-12-25 | 2009-12-25 | Method for liquid filtration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910312236A CN101716440A (en) | 2009-12-25 | 2009-12-25 | Method for liquid filtration |
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| CN101716440A true CN101716440A (en) | 2010-06-02 |
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| CN200910312236A Pending CN101716440A (en) | 2009-12-25 | 2009-12-25 | Method for liquid filtration |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430280A (en) * | 2011-09-20 | 2012-05-02 | 扬州市天龙环保设备有限公司 | Full-automatic filter |
| CN103708503A (en) * | 2013-12-11 | 2014-04-09 | 成都易态科技有限公司 | Causticizing method alkali preparation technology |
| CN104147846A (en) * | 2014-08-22 | 2014-11-19 | 瓮福（集团）有限责任公司 | Phosphoric acid filtration dry-process deslagging slag flushing water filter |
| CN104768625A (en) * | 2013-01-21 | 2015-07-08 | 阿普莎娜股份有限公司 | Liquid filtration systems, components, and methods |
| CN108837592A (en) * | 2018-08-15 | 2018-11-20 | 宁夏宝丰能源集团股份有限公司 | Pelletizing water filling device and pelletizing system |
| CN109499164A (en) * | 2018-12-11 | 2019-03-22 | 杭州富阳博纳水净化设备有限公司 | Filtration system and diafiltration method |
-
2009
- 2009-12-25 CN CN200910312236A patent/CN101716440A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430280A (en) * | 2011-09-20 | 2012-05-02 | 扬州市天龙环保设备有限公司 | Full-automatic filter |
| CN104768625A (en) * | 2013-01-21 | 2015-07-08 | 阿普莎娜股份有限公司 | Liquid filtration systems, components, and methods |
| US9713781B2 (en) | 2013-01-21 | 2017-07-25 | Aquasana, Inc. | Liquid filtration systems, components, and methods |
| CN104768625B (en) * | 2013-01-21 | 2017-09-15 | 阿普莎娜股份有限公司 | Fluid filter system, part and method |
| US11369902B2 (en) | 2013-01-21 | 2022-06-28 | A. O. Smith Water Treatment (North America), Inc. | Liquid filtration filter cap |
| US11951425B2 (en) | 2013-01-21 | 2024-04-09 | A. O. Smith Water Treatment (North America), Inc. | Liquid filtration systems, components, and methods |
| CN103708503A (en) * | 2013-12-11 | 2014-04-09 | 成都易态科技有限公司 | Causticizing method alkali preparation technology |
| CN104147846A (en) * | 2014-08-22 | 2014-11-19 | 瓮福（集团）有限责任公司 | Phosphoric acid filtration dry-process deslagging slag flushing water filter |
| CN108837592A (en) * | 2018-08-15 | 2018-11-20 | 宁夏宝丰能源集团股份有限公司 | Pelletizing water filling device and pelletizing system |
| CN109499164A (en) * | 2018-12-11 | 2019-03-22 | 杭州富阳博纳水净化设备有限公司 | Filtration system and diafiltration method |
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Application publication date: 20100602 |