CN113772785A - Method and system for treating phosphoric acid waste liquid - Google Patents
Method and system for treating phosphoric acid waste liquid Download PDFInfo
- Publication number
- CN113772785A CN113772785A CN202111118164.0A CN202111118164A CN113772785A CN 113772785 A CN113772785 A CN 113772785A CN 202111118164 A CN202111118164 A CN 202111118164A CN 113772785 A CN113772785 A CN 113772785A
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- China
- Prior art keywords
- phosphoric acid
- waste liquid
- membrane
- acid waste
- phosphate
- Prior art date
- Legal status (The legal status 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 status listed.)
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 75
- 239000007788 liquid Substances 0.000 title claims abstract description 62
- 239000002699 waste material Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 40
- 229910001463 metal phosphate Inorganic materials 0.000 claims abstract description 21
- 239000000243 solution Substances 0.000 claims abstract description 20
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 18
- 239000010452 phosphate Substances 0.000 claims abstract description 18
- 239000011550 stock solution Substances 0.000 claims abstract description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000012528 membrane Substances 0.000 claims description 75
- 238000001223 reverse osmosis Methods 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- 239000010405 anode material Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 11
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 abstract description 9
- 229910000398 iron phosphate Inorganic materials 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 239000005955 Ferric phosphate Substances 0.000 abstract description 3
- 239000000084 colloidal system Substances 0.000 abstract description 3
- 229940032958 ferric phosphate Drugs 0.000 abstract description 3
- 229910000399 iron(III) phosphate Inorganic materials 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
Abstract
The specification provides a treatment method and a treatment system for phosphoric acid waste liquid, which comprise the following steps: coarsely filtering the phosphoric acid waste liquid; concentrating phosphate in the coarsely filtered phosphoric acid waste liquid to form a concentrated solution with the concentration of the phosphate being between 10% and 15%; and introducing the concentrated solution into a phosphoric acid stock solution to prepare the metal phosphate. By means of the method and the structure, after the phosphoric acid waste liquid is subjected to rough filtration, impurities such as suspended matters and colloids in the phosphoric acid waste liquid can be removed, and after concentration, the concentrated liquid can be circulated to the phosphoric acid stock solution, so that the phosphoric acid stock solution and iron react to form the iron phosphate required by the preparation of the lithium battery anode. The aqueous solution flowing out of the pressure side outlet is pure, and metal phosphate (ferric phosphate) can be cleaned to obtain a metal phosphate product. In the process of preparing the lithium battery anode, the phosphoric acid waste liquid can enter the preparation process again after being treated without being wasted.
Description
Technical Field
The invention relates to a waste liquid treatment process, and particularly provides a treatment method and a treatment system for phosphoric acid waste liquid.
Background
At present, in the process of preparing the anode material of the lithium battery, phosphoric acid solution and iron react to generate iron phosphate. However, a corresponding phosphoric acid waste liquid is also produced therefrom.
In the prior art, phosphoric acid waste liquid is subjected to post-treatment such as evaporative crystallization. However, this consumes a large amount of heat, and the resulting post-product is not particularly effective and remains in a waste state.
Disclosure of Invention
The present specification aims to provide a method and a system for treating a phosphoric acid waste liquid, which solve at least one of the above-mentioned problems.
In order to achieve the purpose, the invention provides the following technical scheme: a treatment method of phosphoric acid waste liquid comprises the following steps:
coarsely filtering the phosphoric acid waste liquid;
concentrating phosphate in the coarsely filtered phosphoric acid waste liquid to form a concentrated solution with the concentration of the phosphate being between 10% and 15%;
and introducing the concentrated solution into a phosphoric acid stock solution to prepare the metal phosphate.
Preferably, the step of "straining the phosphoric acid waste liquid" includes removing impurities from the phosphoric acid waste liquid.
Preferably, the step of "coarsely filtering the phosphoric acid waste liquid" includes performing a coarse treatment by a polytetrafluoroethylene membrane, silicon nitride or ceramic membrane.
Preferably, "concentrating the phosphate in the coarsely filtered phosphoric acid waste liquid to form a concentrated solution with the phosphate concentration of between 10% and 15%" includes concentrating the phosphate in the coarsely filtered phosphoric acid waste liquid by an acid-resistant concentration membrane.
Preferably, the acid-proof concentration membrane is an acid-proof reverse osmosis membrane, and the concentrated solution flows out from a membrane surface outlet of the acid-proof reverse osmosis membrane.
Preferably, the step of "concentrating phosphate in the coarsely filtered phosphoric acid waste liquid" further comprises: the phosphoric acid waste liquid after rough filtration permeates a part of the acid-resistant reverse osmosis membrane to form an aqueous solution, and flows out from a pressure side outlet of the acid-resistant reverse osmosis membrane.
Preferably, the method further comprises the following steps: and cleaning the metal phosphate by an aqueous solution flowing out of a pressure side outlet of the acid-resistant reverse osmosis membrane.
Preferably, the metal phosphate is used for preparing an anode material of a lithium battery.
The embodiment of the application also discloses phosphoric acid waste liquid processing system includes:
a first filtering membrane, wherein an inlet of the first filtering membrane is used for receiving phosphoric acid waste liquid;
and the inlet of the second filtering membrane is communicated with the outlet of the first filtering membrane, the membrane surface outlet of the second filtering membrane is communicated with a phosphoric acid stock solution for preparing metal phosphate, and the pressure side outlet of the second filtering membrane is communicated with a cleaning device for cleaning the metal phosphate.
Preferably, the method comprises the following steps: the first filtering membrane is a polytetrafluoroethylene membrane, and the second filtering membrane is an acid-resistant reverse osmosis membrane.
Compared with the prior art, by means of the method and the structure, after the phosphoric acid waste liquid is coarsely filtered, impurities such as suspended matters and colloids in the phosphoric acid waste liquid can be removed, after concentration, the concentrated liquid can be circulated to the phosphoric acid stock solution, and the phosphoric acid stock solution and iron react to form the iron phosphate required by the preparation of the lithium battery anode. The aqueous solution flowing out of the pressure side outlet is pure, and metal phosphate (ferric phosphate) can be cleaned to obtain a metal phosphate product. In the process of preparing the lithium battery anode, the phosphoric acid waste liquid can enter the preparation process again after being treated without being wasted.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present specification, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a phosphoric acid waste liquid treatment system provided in an embodiment of the present specification.
The figures of the above drawings are numbered: 1. a first filter membrane; 2. a second filter membrane; 3. a cleaning device; 4. a generating device; 5. and (4) phosphoric acid stock solution.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present specification, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present specification without any inventive step should fall within the scope of protection of the present specification.
The embodiment of the application discloses a treatment method of phosphoric acid waste liquid, which comprises the following steps:
coarsely filtering the phosphoric acid waste liquid;
concentrating phosphate in the coarsely filtered phosphoric acid waste liquid to form a concentrated solution with the concentration of the phosphate being between 10% and 15%;
the concentrate was introduced into a phosphoric acid stock solution 5 to prepare a metal phosphate.
By the method, after the phosphoric acid waste liquid is coarsely filtered, impurities such as suspended matters and colloids in the phosphoric acid waste liquid can be removed, and after concentration, the concentrated liquid can be circulated to the phosphoric acid stock solution 5, so that the phosphoric acid stock solution 5 and iron react to form iron phosphate required by the preparation of the lithium battery anode.
In the present embodiment, the phosphoric acid waste liquid can be roughly filtered by the first filtration membrane 1. The first filtration membrane 1 is a polytetrafluoroethylene membrane. Of course, in other alternative embodiments, the first filter membrane 1 may be made of other organic polymer materials, or may be made of inorganic materials such as silicon nitride membrane and ceramic membrane.
In the present embodiment, the phosphate in the coarsely filtered phosphoric acid waste liquid can be concentrated by the second filtration membrane 2. The second filtration membrane 2 may be an acid resistant concentrated reverse osmosis membrane. The acid-proof concentrated reverse osmosis membrane can enable phosphate to be intercepted on the membrane surface under the action of high pressure and flow out from the membrane surface outlet of the acid-proof reverse osmosis membrane, and the aqueous solution part in the solution can enter the pressure side of the acid-proof reverse osmosis membrane through the membrane surface and flow out from the pressure side outlet.
The concentration of the phosphoric acid in the concentrated solution flowing out from the membrane surface outlet can be increased from 2 percent of the phosphoric acid waste liquid to 10 to 15 percent. After the concentrated solution is introduced into the phosphoric acid raw solution 5, the concentrated solution and the phosphoric acid raw solution 5 may be mixed together and reacted with iron to form iron phosphate.
The aqueous solution flowing out of the pressure side outlet is pure, and metal phosphate (ferric phosphate) can be cleaned to obtain a metal phosphate product. Therefore, in the process of preparing the lithium battery anode, the phosphoric acid waste liquid can enter the preparation process again after being treated, and is not wasted.
Referring to fig. 1, an embodiment of the present application further discloses a phosphoric acid waste liquid treatment system, including:
a first filtering membrane 1, wherein the inlet of the first filtering membrane 1 is used for receiving phosphoric acid waste liquid;
and an inlet of the second filtering membrane 2 is communicated with an outlet of the first filtering membrane 1, a membrane surface outlet of the second filtering membrane 2 is communicated with a phosphoric acid stock solution 5 for preparing metal phosphate, and a pressure side outlet of the second filtering membrane 2 is communicated with a cleaning device 3 for cleaning the metal phosphate.
Specifically, the membrane surface outlet of the second filtration membrane 2 is mixed with a phosphoric acid stock solution 5, and the mixed solution and iron form metal phosphate (iron phosphate) in a generator 4. And the waste liquid generated in the generation device 4 is introduced into the first filtration membrane 1 again.
Preferably, the phosphoric acid waste liquid treatment system comprises: the first filtering membrane 1 is a polytetrafluoroethylene membrane, and the second filtering membrane 2 is an acid-resistant reverse osmosis membrane.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The method for treating the phosphoric acid waste liquid is characterized by comprising the following steps of:
coarsely filtering the phosphoric acid waste liquid;
concentrating phosphate in the coarsely filtered phosphoric acid waste liquid to form a concentrated solution with the concentration of the phosphate being between 10% and 15%;
and introducing the concentrated solution into a phosphoric acid stock solution to prepare the metal phosphate.
2. The method according to claim 1, wherein the step of "straining the phosphoric acid waste liquid" includes removing impurities from the phosphoric acid waste liquid.
3. The method according to claim 1, wherein the step of "straining the phosphoric acid waste liquid" comprises a step of performing a rough treatment by a polytetrafluoroethylene membrane, a silicon nitride membrane or a ceramic membrane.
4. The method according to claim 1, wherein the step of concentrating the phosphate in the phosphoric acid waste liquid after the preliminary filtration to form a concentrated solution having a phosphate concentration of 10% to 15% comprises concentrating the phosphate in the phosphoric acid waste liquid after the preliminary filtration by an acid-resistant concentration membrane.
5. The method for treating phosphoric acid waste liquid according to claim 4, wherein the acid-resistant concentration membrane is an acid-resistant reverse osmosis membrane, and the concentrated liquid flows out from a membrane surface outlet of the acid-resistant reverse osmosis membrane.
6. The method according to claim 5, wherein the step of "concentrating phosphate in the coarsely filtered phosphoric acid waste liquid" further comprises: the phosphoric acid waste liquid after rough filtration permeates a part of the acid-resistant reverse osmosis membrane to form an aqueous solution, and flows out from a pressure side outlet of the acid-resistant reverse osmosis membrane.
7. The method for treating a phosphoric acid waste liquid according to claim 6, further comprising the steps of: and cleaning the metal phosphate by an aqueous solution flowing out of a pressure side outlet of the acid-resistant reverse osmosis membrane.
8. The method for treating phosphoric acid waste liquid according to claim 1, wherein the metal phosphate is used for producing an anode material for a lithium battery.
9. A phosphoric acid waste liquid treatment system, characterized by comprising:
a first filtering membrane, wherein an inlet of the first filtering membrane is used for receiving phosphoric acid waste liquid;
and the inlet of the second filtering membrane is communicated with the outlet of the first filtering membrane, the membrane surface outlet of the second filtering membrane is communicated with a phosphoric acid stock solution for preparing metal phosphate, and the pressure side outlet of the second filtering membrane is communicated with a cleaning device for cleaning the metal phosphate.
10. The phosphoric acid waste liquid treatment system according to claim 9, comprising: the first filtering membrane is a polytetrafluoroethylene membrane, and the second filtering membrane is an acid-resistant reverse osmosis membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111118164.0A CN113772785A (en) | 2021-09-23 | 2021-09-23 | Method and system for treating phosphoric acid waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111118164.0A CN113772785A (en) | 2021-09-23 | 2021-09-23 | Method and system for treating phosphoric acid waste liquid |
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| Publication Number | Publication Date |
|---|---|
| CN113772785A true CN113772785A (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111118164.0A Pending CN113772785A (en) | 2021-09-23 | 2021-09-23 | Method and system for treating phosphoric acid waste liquid |
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Citations (8)
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|---|---|---|---|---|
| US20120231535A1 (en) * | 2011-02-18 | 2012-09-13 | Hydration Systems Llc | Organic Forward Osmosis System |
| EP2692417A1 (en) * | 2012-07-31 | 2014-02-05 | Hydration Systems, Llc | Organic forward osmosis system |
| CN204400744U (en) * | 2015-01-19 | 2015-06-17 | 山东国信环境系统股份有限公司 | Tertiary iron phosphate rinse water recycling and processing device |
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-
2021
- 2021-09-23 CN CN202111118164.0A patent/CN113772785A/en active Pending
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| US20120231535A1 (en) * | 2011-02-18 | 2012-09-13 | Hydration Systems Llc | Organic Forward Osmosis System |
| EP2692417A1 (en) * | 2012-07-31 | 2014-02-05 | Hydration Systems, Llc | Organic forward osmosis system |
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| CN113402046A (en) * | 2021-07-08 | 2021-09-17 | 江苏卓博环保科技有限公司 | Recycling treatment device and method for aging mother liquor in sodium-method iron phosphate production |
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Application publication date: 20211210 |