CN110787512A - Pickling process for metal filter element - Google Patents

Pickling process for metal filter element Download PDF

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Publication number
CN110787512A
CN110787512A CN201910902551.XA CN201910902551A CN110787512A CN 110787512 A CN110787512 A CN 110787512A CN 201910902551 A CN201910902551 A CN 201910902551A CN 110787512 A CN110787512 A CN 110787512A
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CN
China
Prior art keywords
filter element
pickling
filter
acid
element assembly
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Pending
Application number
CN201910902551.XA
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Chinese (zh)
Inventor
何志
杨光耀
何劲松
何佳遂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Stareng Environmental Protection Equipment Co Ltd
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Chengdu Stareng Environmental Protection Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Stareng Environmental Protection Equipment Co Ltd filed Critical Chengdu Stareng Environmental Protection Equipment Co Ltd
Priority to CN201910902551.XA priority Critical patent/CN110787512A/en
Publication of CN110787512A publication Critical patent/CN110787512A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62Regenerating the filter material in the filter
    • B01D29/66Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62Regenerating the filter material in the filter
    • B01D29/66Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles

Abstract

The invention relates to a metal filter element pickling process, which comprises forward pickling and/or reverse pickling, wherein the forward pickling refers to that acid liquor is injected from a filter to enable pickling liquor to immerse a filter element assembly, and the reverse pickling refers to that the acid liquor is directly injected into the filter element assembly until the filter element is filled with the acid liquor. In these two processes, it is reverse pickling each other to make the clearance to the filter core more thorough, compare with traditional pickling mode, this scheme still has following difference, includes three kinds of pickling schemes in this scheme, and the first kind is forward pickling, the second kind is reverse pickling, the third kind is the combination of forward pickling and reverse pickling. This scheme can carry out different cleaning methods to the filter core of not size specification to improve the cleaning efficiency, reduce the wasting of resources.

Description

Pickling process for metal filter element
Technical Field
The invention relates to the field of metal filter element pickling, in particular to a metal filter element pickling process.
Background
The ternary precursor of the lithium battery positive material is usually subjected to precise filtration to concentrate suspended matters in the material in the production process, and the material particles are extremely fine and are easy to block a filter element to reduce the flux of the filter element, so that the filter element is subjected to acid washing after being used for a certain time, and the particles blocked in the pores of the filter element are dissolved to recover the flux of the filter element. Because the strength and the corrosion resistance of the metal filter element are greatly different from those of a plastic filter element and a ceramic filter element, the metal filter element cannot be cleaned by an acid washing process of the plastic filter element or the ceramic filter element.
For example, publication No. CN203329454U discloses a ceramic filter device for separating magnesium hydroxide solution. The ceramic filter device mainly comprises: the device comprises a water inlet tank, a ceramic filter, a cleaning water tank, an acid tank, a concentrated water tank, a water inlet pump, a cleaning water pump and a valve. The filtering time is 20-40 min, and the cleaning comprises air-water backwashing and acid washing. The ceramic filter consists of a shell, a supporting plate, a sealing ring, a ceramic membrane or a ceramic filter element. The method adopts seawater, brine and saturated salt water containing certain magnesium ion concentration as raw materials, a magnesium hydroxide precipitate is formed after sodium hydroxide solution or ammonia water is added, the magnesium hydroxide is separated and recovered by adopting a ceramic filter, water is purified at the same time, the efficiency is high, the equipment is easy to clean, the water yield is large, and the filtering pore size of a filtering element can be selected according to the particle size.
Mention in the above-mentioned patent that the washing comprises air water backwash and pickling two parts, no matter be the pickling or air water backwash all can cause a large amount of water waste, and wash and the direct emission of solution after the pickling can the polluted environment, and to the filter core of different models, one-way washing may have the problem of wasing unclean, pickling solution is extravagant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, is used for pickling a filter element of an external pressure type terminal filter element, and provides a pickling process for a metal filter element, which can be used for carrying out different cleaning modes aiming at filter elements with different sizes, thereby improving the cleaning efficiency and reducing the resource waste.
The purpose of the invention is realized by the following technical scheme:
a metal filter element pickling process comprises the following steps:
forward acid washing;
a1. injecting acid liquor into the filter until the acid liquor immerses the acid-washed filter element component;
a2. adjusting the pressure outside the filter element assembly to be higher than the pressure inside the filter element assembly, so that the acid liquid flows into the inner side of the filter element and is discharged to the outside;
a3. continuously pickling for 60 minutes according to the step a2, and then draining acid liquor in the filter;
a4. washing the filter element component for 5 minutes by using clear water;
a5. back-blowing the filter element for 2 minutes by using gas;
and/or, reverse acid washing;
b1. injecting acid liquor into the filter element assembly until the filter element assembly is filled with the acid liquor;
b2. adjusting the pressure of the inner side of the filter element assembly to be higher than the pressure of the outer side of the filter element assembly, so that the acid liquor flows into the inner side of the filter element, permeates out of the filter element through the pores of the filter element, is collected below the filter and is discharged from a tank bottom valve;
b3. continuously carrying out acid washing in the step b2 for 60 minutes, and then draining the acid liquor in the filter;
b4. washing the filter element assembly with clean water for 5 min until the clean water seeps from the filter element to the outside of the filter element and is discharged;
b5. and (5) carrying out back flushing on the filter element for 2 minutes by using gas.
In the scheme, the concepts of forward pickling and reverse pickling are introduced for the first time, wherein the forward pickling refers to that acid liquor is injected from a filter to enable the acid liquor to immerse a filter element assembly (namely a filter element), and the reverse pickling refers to that the acid liquor is directly injected into the filter element assembly (the filter element) until the filter element is filled with the acid liquor. In these two processes, it is reverse pickling each other to make the clearance to the filter core more thorough, compare with traditional pickling mode, this scheme still has following difference, includes three kinds of pickling schemes in this scheme, and the first kind is forward pickling, the second kind is reverse pickling, the third kind is the combination of forward pickling and reverse pickling. The specific selection mode is as follows:
for large-scale filtering equipment, because acid liquor is needed to immerse the filter element in forward acid washing, the needed acid liquor amount is large, the cost for recovering and treating the acid liquor is high, reverse acid feeding is adopted, the filter element does not need to be immersed, and the method is suitable for acid washing of metal filter elements in large-scale precise filtering equipment.
On the contrary, for small-size precision filtration equipment, because the equipment volume is less, the difficult evenly distributed of acid, consequently adopt the acid liquor mode of submergence to carry out the pickling to the filter core.
For medium-sized filtering equipment, mainly high-precision filtering equipment, a forward pickling and reverse pickling item is combined to improve pickling capacity.
Further, in the step a2, the pressure outside the filter element assembly is higher than the pressure inside the filter element assembly by 0.1 MPa.
Further, in the step b2, the pressure inside the filter element assembly is 0.1MPa higher than the pressure outside the filter element assembly.
The forward and reverse pickling is carried out by using the air pressure difference of 0.1Mpa, so that the acid liquor can be ensured to have enough flow velocity to impact the surface of the filter element, meanwhile, the contact time is longer, and the pickling effect is optimal under the air pressure difference through experimental verification.
Further, the gas pressure used in the back blowing in the step gases a5 and b5 is 0.15Mpb, and the purpose of the back blowing using the gas is mainly to remove the water drops remained in the filter element.
Further, the gas used for back flushing is compressed air or nitrogen.
Further, pure water or deionized water is used for the clear rinsing.
Further, the acid solution is dilute sulfuric acid with PH = 1. The dilute sulfuric acid has the advantage that the dilute sulfuric acid is easier to dissolve and take away with cleaning water in the cleaning process, so that acid liquor is prevented from remaining in the filter element.
The invention has the beneficial effects that:
(1) the acid liquor concentration is low, and the filter element cannot be damaged;
(2) the filter element can still have better cleaning effect under the condition of limited acid concentration;
(3) the process is simple, and full-automatic control is easy to realize;
(4) the cleaned substances can be recovered in the form of solution, and the environment is not polluted;
(5) the pickling effect of each filter element is relatively uniform.
Drawings
FIG. 1 is a schematic diagram of forward pickling;
FIG. 2 is a schematic diagram of reverse pickling.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited to the following.
A metal filter element pickling process is used for pickling a filter element of an external pressure type terminal filter element and comprises the following steps:
forward acid washing;
a1. injecting acid liquor into the filter 1 until the acid liquor immerses the pickled filter element component 3;
a2. adjusting the pressure of the outer side of the filter element assembly 3 to be higher than the pressure of the inner side of the filter element assembly, so that the acid liquid flows into the inner side of the filter element and is discharged to the outside;
a3. continuously pickling for 60 minutes according to the step a2, and then draining acid liquor in the filter 1;
a4. washing the filter element assembly with clear water for 35 minutes;
a5. back-blowing the filter element for 2 minutes by using gas;
and/or, reverse acid washing;
b1. injecting acid liquor into the filter element assembly 3 until the filter element assembly 3 is filled with the acid liquor;
b2. adjusting the pressure of the inner side of the filter element assembly 3 to be higher than the pressure of the outer side, so that the acid liquor flows into the inner side of the filter element, permeates out of the filter element through the pores of the filter element, is collected below the filter 1 and is discharged from the tank bottom valve 11;
b3. continuously carrying out acid washing in the step b2 for 60 minutes, and then draining the acid liquor in the filter 1;
b4. washing the filter element assembly 3 with clean water for 5 minutes until the clean water seeps out of the filter element from the filter element;
b5. and (5) carrying out back flushing on the filter element for 2 minutes by using gas.
As a preferred embodiment, in step a2, the pressure outside the filter element assembly 3 is higher than the pressure inside the filter element assembly by 0.1MPa, in step b2, the pressure inside the filter element assembly 3 is higher than the pressure outside by 0.1MPa, the air pressure used in the back blowing in the steps a5 and b5 is 0.15Mpb, the air used in the back blowing is compressed air or nitrogen, the pure water or deionized water is used for clear flushing, and the acid solution is dilute sulfuric acid with pH = 1.
As shown in FIG. 1, which is a schematic view of forward pickling of the present invention,
The device comprises a filter 1, a clear liquid outlet valve 2, a filter element assembly 3, an emptying valve 4, a flushing valve 5, forward clear water valves 1-6, forward acid liquid valves 1-7, a back-flushing air valve 8, a pressure regulating valve 9, a back-flushing air source 10 and a tank bottom valve 11.
Wherein, the filter element assembly 3 is positioned in the filter 1, the filter element assemblies 3 have different quantity according to the filters 1 with different filtering grades, the general filter element assemblies 3 all adopt the mode of parallel connection to form multi-stage filtration, as can be seen with reference to figure 1, an emptying valve 4 and a tank bottom valve 11 are respectively arranged at the tank top and the tank bottom of the filter 1, each filter element assembly 3 is provided with a flushing valve 5 and a clear liquid outlet valve 2 and is connected with the filter element assembly 3 through pipelines, wherein the clear liquid outlet valve 2 discharges clear water/acid liquid out of the filter 1 through the pipelines, forward clear water valves 1-6 are connected with the flushing valve 5 through the pipelines for feeding clear water, a pressure regulating valve 9, a back blowing air source 10 and a tank bottom valve 11 are sequentially connected through the pipelines to form a back blowing system, the pressure regulating valve 9 is connected with the flushing valve 5 through the pipelines, the forward acid liquid valves 1-7 are directly connected with the tank body of the filter, used for feeding acid liquor into the tank.
The forward pickling operation steps are as follows:
if a plurality of groups of filter elements exist, the acid cleaning is carried out on the plurality of groups of filter elements in turn, the acid cleaning is carried out on one group of filter elements each time, and the acid cleaning steps of the filter elements which are currently subjected to the acid cleaning are as follows:
1-1, opening a clear liquid outlet valve 2, closing an emptying valve 4, closing a flushing valve 5, closing a forward clear water valve 1-6, closing a back flushing air valve 8 and closing a tank bottom valve 11;
1-2, opening a forward acid liquid valve 1-7, and injecting acid liquid into the filter 1 until the acid liquid immerses the acid-washed filter element assembly 3;
1-3, adjusting the clear liquid outlet valve 2 to ensure that the pressure outside the filter element assembly 3 is higher than the pressure inside the filter element by 0.1Mpa, so that the acid liquid flows into the inside of the filter element and is discharged to the outside through the clear liquid outlet valve 2;
1-4, continuously pickling for 60 minutes according to the step 3, closing a forward acid liquid valve 1-7, closing a clear liquid outlet valve 2, opening a tank bottom valve 11, opening an emptying valve 4, and exhausting the acid liquid in the filter 1 through the tank bottom valve 11;
1-5, opening a flushing valve 5, opening a forward clean water valve 1-6, flushing the filter element group 3 with clean water for 35 minutes, and then closing the forward clean water valve 1-6;
1-6, adjusting the pressure of the outlet of the pressure regulating valve 9 to 0.15Mpa, opening a back-blowing air valve 8, and performing back-blowing for 2 minutes by using gas;
1-7, opening a clear liquid outlet valve 2, closing a flushing valve 5, closing an emptying valve 4, closing a tank bottom valve 11, closing a forward clear water valve 1-6, closing a forward acid liquid valve 1-7, closing a back flushing air valve 8, and returning to a normal filtering process.
During reverse pickling, corresponding modification is performed on the basis of forward pickling, and the difference is that a reverse acid liquid valve 2-6 and a reverse clean water valve 2-7 in the reverse pickling are respectively connected with a flushing valve 5, and the reference is made to fig. 2.
2-1, closing a clear liquid outlet valve 2, closing an emptying valve 4, opening a flushing valve 5, closing a reverse clear water valve 2-7, closing a back flushing air valve 8 and opening a tank bottom valve 11;
2-2, opening a reverse acid liquid valve 2-6, and injecting acid liquid into the filter element assembly 3 until the filter element assembly 3 is filled with the acid liquid;
2-3, adjusting a reverse acid liquid valve 2-6 to enable the pressure in the filter element assembly 3 to be higher than the pressure in the outer side by 0.1Mpa, so that the acid liquid flows into the filter element, permeates out of the filter element through the pores of the filter element, is collected below the filter and is discharged from a tank bottom valve 11;
2-4, continuously pickling for 60 minutes according to the step 3, closing the reverse acid liquid valve 2-6, opening the vent valve 4, and draining the acid liquid in the filter 1 through a tank bottom valve;
2-5, opening a clean water valve 6, washing the filter element assembly 3 with clean water, collecting the clean water after permeating from the filter element to the outside of the filter element to the bottom of the filter 1, discharging the clean water through a tank bottom valve 11, and closing a reverse clean water valve 2-7 after washing for 5 minutes;
2-6, adjusting the pressure of the outlet of the pressure regulating valve 9 to 0.15Mpa, opening a back-blowing air valve 8, and performing back-blowing for 2 minutes by using gas;
2-7, opening a clear liquid outlet valve 2, closing a flushing valve 5, closing an emptying valve 4, closing a tank bottom valve 11, closing a clear water valve 6, closing an acid liquid valve 7, closing a back flushing air valve 8, and returning to a normal filtering process.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. The utility model provides a metal filter core pickling process for the filter core pickling of external pressure type terminal filter original paper, its characterized in that includes:
forward acid washing;
a1. injecting acid liquor into the filter until the acid liquor immerses the acid-washed filter element component;
a2. adjusting the pressure outside the filter element assembly to be higher than the pressure inside the filter element assembly, so that the acid liquid flows into the inner side of the filter element and is discharged to the outside;
a3. continuously pickling for 60 minutes according to the step a2, and then draining acid liquor in the filter;
a4. washing the filter element component for 5 minutes by using clear water;
a5. back-blowing the filter element for 2 minutes by using gas;
and/or, reverse acid washing;
b1. injecting acid liquor into the filter element assembly until the filter element assembly is filled with the acid liquor;
b2. adjusting the pressure of the inner side of the filter element assembly to be higher than the pressure of the outer side of the filter element assembly, so that the acid liquor flows into the inner side of the filter element, permeates out of the filter element through the pores of the filter element, is collected below the filter and is discharged from a tank bottom valve;
b3. continuously carrying out acid washing in the step b2 for 60 minutes, and then draining the acid liquor in the filter;
b4. washing the filter element assembly with clean water for 5 min until the clean water seeps from the filter element to the outside of the filter element and is discharged;
b5. and (5) carrying out back flushing on the filter element for 2 minutes by using gas.
2. The process of claim 1, wherein in step a2, the pressure outside the filter element assembly is higher than the pressure inside the filter element assembly by 0.1 MPa.
3. The process of claim 2, wherein in step b2, the pressure inside the filter element assembly is higher than the pressure outside by 0.1 MPa.
4. The process of claim 3, wherein the gas pressure used for back flushing in the step a5 and b5 is 0.15 Mpb.
5. The process for pickling a metal filter element as recited in claim 4, wherein the gas used for back flushing is compressed air or nitrogen.
6. The process of claim 1, wherein the clean rinse is pure or deionized water.
7. The process of claim 1, wherein the acid solution is dilute sulfuric acid having a PH = 1.
CN201910902551.XA 2019-09-24 2019-09-24 Pickling process for metal filter element Pending CN110787512A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112973212A (en) * 2021-02-22 2021-06-18 宜宾丝丽雅股份有限公司 Method for cleaning filter element for viscose production
CN113198221A (en) * 2021-04-30 2021-08-03 成都思达能环保设备有限公司 Backwashing method of filter element

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19749411C1 (en) * 1997-08-12 1999-08-26 Chmiel Biological water treatment membranes subjected to intermittent reverse- flow
JP2004230287A (en) * 2003-01-30 2004-08-19 Japan Organo Co Ltd Method for backwashing filtering device
CN202010520U (en) * 2011-03-16 2011-10-19 上海依科绿色工程有限公司 Off-line cleaning device for reverse osmosis membrane
CN203329454U (en) * 2013-06-21 2013-12-11 天津滨瀚环保科技发展有限公司 Ceramic filter device for separating magnesium hydroxide solution
CN110193288A (en) * 2019-06-26 2019-09-03 吉林省锦嵘滔环境工程有限公司 A kind of restorative chemical cleaning method of unmanned automatic on-line of submerged ultrafiltration

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19749411C1 (en) * 1997-08-12 1999-08-26 Chmiel Biological water treatment membranes subjected to intermittent reverse- flow
JP2004230287A (en) * 2003-01-30 2004-08-19 Japan Organo Co Ltd Method for backwashing filtering device
CN202010520U (en) * 2011-03-16 2011-10-19 上海依科绿色工程有限公司 Off-line cleaning device for reverse osmosis membrane
CN203329454U (en) * 2013-06-21 2013-12-11 天津滨瀚环保科技发展有限公司 Ceramic filter device for separating magnesium hydroxide solution
CN110193288A (en) * 2019-06-26 2019-09-03 吉林省锦嵘滔环境工程有限公司 A kind of restorative chemical cleaning method of unmanned automatic on-line of submerged ultrafiltration

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112973212A (en) * 2021-02-22 2021-06-18 宜宾丝丽雅股份有限公司 Method for cleaning filter element for viscose production
CN112973212B (en) * 2021-02-22 2022-08-05 宜宾丝丽雅股份有限公司 Method for cleaning filter element for viscose production
CN113198221A (en) * 2021-04-30 2021-08-03 成都思达能环保设备有限公司 Backwashing method of filter element
CN113198221B (en) * 2021-04-30 2023-03-03 成都思达能环保设备有限公司 Backwashing method of filter element

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