CN212292849U - Waste liquid regeneration facility after glass cleaning - Google Patents
Waste liquid regeneration facility after glass cleaning Download PDFInfo
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- CN212292849U CN212292849U CN201820259591.8U CN201820259591U CN212292849U CN 212292849 U CN212292849 U CN 212292849U CN 201820259591 U CN201820259591 U CN 201820259591U CN 212292849 U CN212292849 U CN 212292849U
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- pipeline
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- waste liquid
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- 239000007788 liquid Substances 0.000 title claims abstract description 116
- 239000002699 waste material Substances 0.000 title claims abstract description 43
- 230000008929 regeneration Effects 0.000 title claims abstract description 28
- 238000011069 regeneration method Methods 0.000 title claims abstract description 28
- 239000011521 glass Substances 0.000 title claims abstract description 22
- 238000004140 cleaning Methods 0.000 title claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000008367 deionised water Substances 0.000 claims abstract description 21
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 21
- 239000002244 precipitate Substances 0.000 claims description 19
- 239000010865 sewage Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000005406 washing Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 23
- 239000002253 acid Substances 0.000 description 18
- 238000005530 etching Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 4
- 229910004014 SiF4 Inorganic materials 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 3
- 238000007654 immersion Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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Abstract
The application discloses waste liquid regeneration facility after glass washs increases through top and the flowing back pipeline at a filter tower that is equipped with filter equipment and connects compressed air input pipe-line system and deionized water washing pipe-line system, when detecting the pressure differential of filter equipment both sides exceeds the setting value, and each corresponding valve is closed and opened in control system control, stops the filtration operation of waste liquid to wash through compressed air and deionized water and wash, get rid of and adhere to the flocculent deposit of filter equipment downside, regeneration filter equipment. By adopting the waste liquid regeneration equipment and the regeneration and use method disclosed by the application, the industrial process is relatively simple, and the work is reliable. And, when guaranteeing the quality of waste liquid regeneration, both can reduce the emission of waste liquid, the environmental protection, reduce environmental protection cost, can reduce the use amount and the purchase volume of acidizing fluid again, reduce the cost of material purchase.
Description
Technical Field
The application relates to the field of glass industry, in particular to waste liquid regeneration equipment after glass cleaning.
Background
Glass products, especially when used as liquid crystal display panels, are often subjected to immersion etching using an acid solution to achieve thinning. The glass is typically subjected to a soaking and etching process using a concentration of hydrofluoric acid (HF), such as 40% -50% hydrofluoric acid. However, hydrofluoric acid is a volatile, highly corrosive acid, and thus waste liquid generated after immersion and etching cannot be disposed of at will.
Soaking and etching glass with hydrofluoric acid, and performing chemical reaction specifically to obtain SiO2React with HF to produce gaseous SiF4However, gaseous SiF4Will hydrolyze to produce a crystalline, usually white, flocculent precipitate, which leads to a clouding of the etched solution and a white haze, wherein the white flocculent precipitate is SiF4Ortho silicic acid (H) produced by hydrolysis4SiO4) And the white mist is acid mist generated by dissolving HF in water vapor. When the turbidity in the hydrofluoric acid solution reaches a certain ratio, the operation of etching the glass will affect the efficiency of etching the glass and the smoothness of the glass surface, which means that the batch of acid solution cannot be used for production, i.e. waste liquid is generated. At present, the batch of acid liquor, i.e. waste liquor, is usually drained and replaced with new acid liquor.
Therefore, firstly, the replaced acid solution contains high hydrofluoric acid content, so that the acid solution needs to be treated without harm before being discharged, which brings treatment cost. Meanwhile, the consumption and purchase of new hydrofluoric acid are increased, namely the purchase cost is increased.
Thus, if the acid liquor and the white flocculent precipitate can be separated, for example, by a filter, the acid liquor can be reused, which greatly reduces the production cost.
However, the white flocculent precipitate in the acid liquor can be solidified after a long time, like glass slag, and has a relatively high viscosity, and if the white flocculent precipitate is filtered by using a simple filter bag, the whole pipeline needs to be cleaned manually every day, and the filter bag needs to be replaced. This also increases the cost of procurement in view of the dangers that may result from contact of the acid during manual cleaning and in view of the need for regular replacement of the filter bags. More importantly, the harmless treatment of a large amount of acid liquor cannot be realized at present.
Of course, there is also a natural precipitation method, in which the acid solution is stored in a large tank, allowed to precipitate naturally, and then the supernatant is taken and recycled. This approach is clearly inefficient and requires significant tank space.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present application aims to provide a waste liquid recycling apparatus after glass cleaning.
The technical scheme of the application is as follows:
the application discloses waste liquid regeneration equipment after glass cleaning, which comprises a filter tower, wherein a filter device for separating clear liquid and flocculent precipitates in waste liquid is arranged in the filter tower, the lower part of the filter tower is connected with a liquid inlet pipeline through a liquid inlet valve, and the upper part of the filter tower is connected with a liquid discharge pipeline through a liquid discharge valve; the device also comprises a compressed air input pipeline system and a deionized water cleaning pipeline system, wherein the compressed air input pipeline system comprises a gas transmission pipeline which is connected with the upper part of the filter tower through a gas transmission valve and used for flushing the filter device by using compressed air; the deionized water cleaning pipeline system is connected to the liquid drainage pipeline through a water delivery valve and is used for cleaning the liquid drainage pipeline and the filtering device by using deionized water; the pressure gauges are respectively arranged on the liquid inlet pipeline and the liquid discharge pipeline; the control system is used for calculating the pressure difference between the liquid inlet pipeline and the liquid discharge pipeline and determining the opening and closing of each valve according to the pressure difference.
Preferably, the compressed air input pipeline system further comprises a cleaning liquid inlet pipeline and a cleaning liquid inlet valve which are connected and used for cleaning the liquid inlet pipeline.
More preferably, the deionized water cleaning pipeline system further comprises a cleaning pipeline and a cleaning valve, wherein the cleaning pipeline and the cleaning valve are connected with the liquid drainage pipeline and the cleaning liquid inlet pipeline.
Preferably, the drainage pipeline is provided with a plurality of drainage pipelines, and the drainage pipelines are respectively connected with a drainage valve and then are dispersedly arranged at the upper part of the filter tower.
Preferably, the lower part of the filter tower is also provided with a sewage draining outlet for draining the flocculent precipitate and a sewage draining valve for opening and closing the sewage draining outlet.
More preferably, the lower part of the filter tower is arranged to be in an inverted cone shape, and the sewage draining outlet is positioned at the lowest part of the inverted cone shape.
Preferably, the filter device comprises a plurality of filter elements, and filter cloth is arranged on the filter elements.
Preferably, each valve is a pneumatic diaphragm valve.
The utility model discloses waste liquid regeneration facility after glass washs increases to connect compressed air input pipe-line system and deionized water washing pipe-line system through top and the flowing back pipeline at a filter tower that is equipped with filter equipment, when detecting the pressure differential of filter equipment both sides exceeds the setting value, and each corresponding valve is closed and opened in control system control, stops the filtration operation of waste liquid to wash through compressed air and deionized water and wash, get rid of and adhere to the flocculent deposit of filter equipment downside, regeneration filter equipment. By adopting the waste liquid regeneration equipment and the regeneration and use method disclosed by the application, the industrial process is relatively simple, and the work is reliable. And, when guaranteeing the quality of waste liquid regeneration, both can reduce the emission of waste liquid, the environmental protection, reduce environmental protection cost, can reduce the use amount and the purchase volume of acidizing fluid again, reduce the cost of material purchase.
Drawings
Fig. 1 is a sectional view of a filter tower in the waste liquid regenerating apparatus of the present application.
Fig. 2 is an internal structure and a flow chart of the waste liquid regeneration apparatus of the present application.
Fig. 3 is a top view of a filter tower in the waste liquid regeneration device of the present application.
In the figure, 1, a filter tower 2, a clear liquid tank 3, a compressed air tank 4, a deionized water tank 5, a water drainage system 11, a filter device 12, a liquid inlet pipeline 13, a liquid discharge pipeline 14, a sewage discharge outlet 15, a sewage discharge valve 16, a collection vehicle 17, a gas transmission pipeline 33, a cleaning pipeline 41, a water transmission valve 121, a liquid inlet valve 123, a cleaning liquid inlet pipeline 124, a cleaning liquid inlet valve 129, a liquid inlet pressure gauge 131, a liquid discharge pipeline small pipe 132, a liquid discharge valve 133, a tank inlet valve 139, a liquid discharge pressure gauge 171, a gas transmission valve 172, a one-way valve 173, a pressure regulating valve 331 and a cleaning valve are arranged.
Detailed Description
In order to make the purpose, technical scheme and effect of the present application clearer and clearer, the present application is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method is mainly applied to the production industry of cleaning glass by using hydrofluoric acid liquid, and the waste liquid after the glass is cleaned still contains high hydrofluoric acid liquid components, but white flocculent precipitates generated by the glass acid cleaning affect the surface smoothness of the cleaned glassware, so that the white flocculent precipitates need to be removed when reaching a certain concentration, and the acid liquid components cannot be completely utilized. For example, in the photovoltaic industry, when it is necessary to clean the glass of various panels with an acid solution.
The utility model discloses waste liquid regeneration facility after glass washs, including a control center, control center is used for controlling whole waste liquid regeneration flow, mainly through controlling each valve, control whole waste liquid regeneration flow.
The waste liquid regeneration equipment comprises a filter tower 1, as shown in fig. 1, a filtering device 11 is arranged inside the filter tower 1, and the filtering device 11 is used for filtering the waste liquid to separate clear liquid and white flocculent precipitate in the waste liquid. The filtering device 11 is preferably composed of a plurality of vertically arranged cylindrical filter elements, each filter element is provided with a filter cloth, and the filter cloth is preferably arranged below the filter element. And, in a better embodiment, the lower part of the filtering tower 1 is designed to be an inverted cone, and a sewage draining outlet 14 and a sewage draining valve 15 are arranged at the lowest part of the inverted cone.
As shown in fig. 2, during operation, the control system opens the liquid inlet valve 121, and the waste liquid is fed into the filtering tower 1 under a certain pressure from the liquid inlet pipe 12 disposed at the lower part of the filtering tower 1, and is filtered and separated upwards through the filtering device 11 into a clear liquid and flocculent precipitates attached and accumulated below the filter cloth. And, the opening of feed liquor pipeline 12 in the lower part of filter tower 1 can set up to a plurality ofly, and every opening outside all is provided with a feed liquor valve 121, all can open respectively with close to can adjust according to the actual work needs the income flow of waste liquid. The clear liquid, i.e. the acid liquid, after filtration, is collected from the upper, preferably top, drain pipe 131 of the filtration column 1 into the drain pipe 13 and sent to the clear liquid tank 2 for storage. Also, the drain pipe small tube 131 is preferably provided in plural, as shown in the top view of fig. 3, in plural uniformly distributed, so that the outflow of the clear liquid is more convenient, and it is more reasonable in the subsequent washing and rinsing. A drain valve 132 is connected to each drain pipe tube 131, and the drain pipe 13 is connected to the clear liquid tank 2 to store the clear liquid in the clear liquid tank 2.
And the flocculent precipitate falls to the vicinity of a sewage discharge port 14 below the filter tower 1 in the subsequent washing and cleaning processes, is discharged out of the filter tower 1 after a sewage discharge valve 15 is opened, falls into a collection vehicle 16 placed below the sewage discharge port 14, and is collected and discarded.
Each pipeline is provided with a corresponding valve for opening or closing each pipeline under the instruction of the control center. For example, each drain pipe 131 passes through a drain valve 132 before being connected to the filtration column 1, and the drain pipe 13 also passes through a tank inlet valve 133 before being connected to the clear liquid tank 2.
The upper part of the filter tower 1 is also connected to the gas pipeline 17 via a gas valve 171 and a check valve 172, i.e. connected to a compressed air input pipeline system. The check valve 172, for example, a check ball valve, can ensure that the fluid can only flow from the gas pipeline 17 to the upper part of the filter tower 1, or flow into the upper part of the filter tower 1 after passing through the drainage pipeline 13. That is, only the high-pressure gas in the compressed air tank 3 is regulated by the pressure regulating valve 173, and then flows through the check valve 172 from the gas transmission pipe 17, and finally flows into the filter tower 1 from the upper part of the filter tower 1, including directly connecting to the upper part of the filter tower 1 through a pipe, or flowing into the upper part of the filter tower 1 through the liquid discharge pipe 13, and reversely flushing the filter device 11. By providing the one-way valve 172, it is ensured that the clear liquid in the liquid discharge pipe 13 cannot flow into the gas transmission pipe 17. The gas delivery valve 171 is used for opening and closing the gas delivery pipeline 17 according to requirements under the control of the control system.
At this time, since a part of the high pressure gas is introduced into the filter tower 1 through the small discharge pipe 131, when the small discharge pipe 131 is provided in a plurality of evenly distributed, it is ensured that each filter element in the lower filter device 11 is washed.
In a more preferred embodiment, the gas pipeline 17 also introduces compressed air into the liquid inlet pipeline 12 through a cleaning liquid inlet pipeline 123 and a cleaning liquid inlet valve 124, and flushes the liquid inlet pipeline 12.
In the preferred embodiment of the present application, a deionized water cleaning piping system is further provided at the upper part of the filtration tower 1, including a deionized water tank 4 connected to the drain 13 through a water delivery valve 41, so that deionized water can be used to reversely clean the drain 13 and the filtration device 11, further ensuring the elution of the flocculent precipitate. And the washed flocculent precipitate also falls to the drain outlet 14. Simultaneously, drainage pipe 13 can also be connected to through washing valve 331 and washing pipeline 33 wash inlet line 123, like this, just so, can make deionized water can control center control is opened wash behind the valve 331, through wash inlet line 123 and flow into inlet line 12, it is right wash inlet line 123 reach inlet line 12 washes. The sewage after washing flows into the sewage system 5 or is collected and treated.
Meanwhile, part of the deionized water flowing into the filter tower 1 also flows into the sewer system 5 through the valve at the upper part of the filter tower 1.
A pressure gauge, i.e. a liquid inlet pressure gauge 129 and a liquid discharge pressure gauge 139, is respectively arranged on the liquid inlet pipe 12 and the liquid discharge pipe 13. Under the control of the control center, the liquid waste is filtered, meanwhile, the pressure inside the liquid inlet pipeline 12 and the liquid discharge pipeline 13 is detected in real time by reading the measured value of the pressure gauge, and the pressure difference is calculated in real time. Since the floc deposits are accumulated on the filter cloth covered by the filter element in the filter device 11, although the filter cloth is preferably covered under the filter element, the floc deposits of smaller particles are still clogged on the filter cloth, resulting in poor filtration, which increases the pressure difference. Therefore, by arranging the pressure gauge, the control center respectively collects the pressure on the liquid inlet pipeline 12 and the liquid discharge pipeline 13, calculates the pressure difference, compares the pressure difference with a preset value input in advance, and can monitor the blocking condition of the filtering device in real time according to the comparison result, thereby determining whether to carry out the next flushing work by controlling the on-off of each valve.
When the control center detects that the pressure difference between the liquid inlet pipeline 12 and the liquid discharge pipeline 13 exceeds the set value, the control center firstly closes the liquid inlet valve 121 and stops the waste liquid from entering the filter tower 1. Then, the blow-off valve 15 and the gas delivery valve 171 are opened, compressed air is fed from the compressed air tank 3 through the pressure regulating valve 173, the filter device 11 is backwashed from the upper portion, the flocculent precipitate attached to the lower side of the filter device 11 and even embedded in the meshes of the filter cloth is flushed down, and the flushed flocculent precipitate falls along the flow of the high-pressure gas and is discharged through the blow-off port 14, falls into the collection vehicle 16 placed below the blow-off port 14, and is collected and discarded. Then the gas delivery valve 171 is controlled to be closed, the water delivery valve 41 is opened, deionized water is delivered, the liquid discharge pipeline 13 and the filtering device 11 are cleaned, and part of the deionized water also falls into the collecting vehicle 16.
When the cleaning work is finished, the control system collects the pressure on the liquid inlet pipeline 12 and the liquid discharge pipeline 13 again, calculates the pressure difference, controls to switch each relevant valve when the pressure difference is smaller than the set value, stops the washing and cleaning processes, and restarts the filtering operation.
The valve used in the present application, considering that the liquid in the pipeline is the hydrofluoric acid of strong corrosivity, all preferably is pneumatic diaphragm valve, especially adopts the pneumatic diaphragm valve of hard rubber material.
The utility model discloses a waste liquid regeneration facility after glass washs, through the top at filter tower 1 and drain 13 increase connect compressed air input pipe-line system and deionized water washing pipe-line system, when detecting the pressure differential of 11 both sides of filter equipment exceeds the setting value, and each corresponding valve is closed and opened in control system control, stops the filtration operation of waste liquid to wash through compressed air and deionized water wash, get rid of and adhere to flocculent precipitate of the 11 downside of filter equipment, regeneration filter equipment 11. By adopting the waste liquid regeneration equipment disclosed by the application, the industrial process is relatively simple and the work is reliable. And, when guaranteeing the quality of waste liquid regeneration, both can reduce the emission of waste liquid to the environmental protection reduces the environmental protection cost, can reduce the use amount and the purchase volume of acidizing fluid again, reduces material purchasing cost.
It should be understood that the application of the present application is not limited to the above examples, and that modifications or changes may be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.
Claims (7)
1. The waste liquid regeneration equipment after glass cleaning is characterized by comprising a filter tower, wherein a filter device for separating clear liquid and flocculent precipitates in waste liquid is arranged in the filter tower, the lower part of the filter tower is connected with a liquid inlet pipeline through a liquid inlet valve, and the upper part of the filter tower is connected with a liquid discharge pipeline through a liquid discharge valve;
the device comprises a compressed air input pipeline system and a deionized water cleaning pipeline system, wherein the compressed air input pipeline system comprises a gas transmission pipeline which is connected with the upper part of the filter tower through a gas transmission valve and used for flushing the filter device by using compressed air; the deionized water cleaning pipeline system is connected to the liquid drainage pipeline through a water delivery valve and is used for cleaning the liquid drainage pipeline and the filtering device by using deionized water; and
pressure gauges respectively arranged on the liquid inlet pipeline and the liquid discharge pipeline;
the control system is used for calculating the pressure difference between the liquid inlet pipeline and the liquid discharge pipeline and determining the opening and closing of each valve according to the pressure difference.
2. The apparatus of claim 1, wherein the compressed air input conduit system further comprises a wash inlet conduit and a wash inlet valve coupled to and configured to wash the inlet conduit.
3. The waste liquid regeneration apparatus as claimed in claim 1, wherein the plurality of drain pipes are separately provided at an upper portion of the filtration tower after being connected to a drain valve.
4. The waste liquid recycling apparatus as claimed in claim 1, wherein a drain outlet for discharging said flocculent precipitate and a drain valve for opening and closing said drain outlet are further provided at a lower portion of said filtering tower.
5. The waste liquid regeneration equipment as claimed in claim 4, wherein the lower part of the filter tower is arranged in an inverted cone shape, and the sewage draining outlet is positioned at the lowest part of the inverted cone shape.
6. The waste liquid recycling apparatus of claim 1, wherein the filtering means comprises a plurality of filter elements, and the filter elements are provided with filter cloth.
7. The spent liquor regeneration device of any of claims 1 to 6 wherein each valve is a pneumatic diaphragm valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820259591.8U CN212292849U (en) | 2018-02-15 | 2018-02-15 | Waste liquid regeneration facility after glass cleaning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820259591.8U CN212292849U (en) | 2018-02-15 | 2018-02-15 | Waste liquid regeneration facility after glass cleaning |
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| Publication Number | Publication Date |
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| CN212292849U true CN212292849U (en) | 2021-01-05 |
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| CN201820259591.8U Active CN212292849U (en) | 2018-02-15 | 2018-02-15 | Waste liquid regeneration facility after glass cleaning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557909A (en) * | 2018-02-15 | 2018-09-21 | 上海晶福机电科技有限公司 | Spent solution regeneration equipment and working method after a kind of glass cleaning |
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2018
- 2018-02-15 CN CN201820259591.8U patent/CN212292849U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557909A (en) * | 2018-02-15 | 2018-09-21 | 上海晶福机电科技有限公司 | Spent solution regeneration equipment and working method after a kind of glass cleaning |
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