CN115745300A - Treatment process for aluminum foil dissolving wastewater of waste lithium iron phosphate by alkali dissolution method - Google Patents
Treatment process for aluminum foil dissolving wastewater of waste lithium iron phosphate by alkali dissolution method Download PDFInfo
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Abstract
The invention discloses a treatment process for aluminum foil dissolving wastewater by an alkali dissolution method of waste lithium iron phosphate, wherein the treatment process comprises the following steps: s1, filtering I (sodium aluminate filtering) by using a plate and frame press; s2, filtering by using a ceramic membrane; s3, a nanofiltration membrane separation and purification device I (membrane concentration is carried out on the sodium aluminate wastewater to obtain a concentrated phase and a clear phase); s4, a reverse osmosis membrane concentration device I; s5, filtering the di (aluminum hydroxide) by using a plate and frame press; s6, a nanofiltration membrane concentration device II (sodium sulfate recovery); s7, concentrating by using a reverse osmosis membrane concentrating device II (concentrating by using sodium sulfate); s8, a reverse osmosis membrane concentration device III (a water quality purification system is used for water quality purification); s9 bipolar membrane separation device (ionization of sodium sulfate to sulfuric acid and sodium hydroxide). The invention adopts the combined process of nanofiltration, multistage reverse osmosis and bipolar membrane treatment to replace the traditional evaporative crystallization, the comprehensive cost is lower than that of the traditional method, the waste water is basically not discharged, the acid and alkali addition is not needed, and the sulfuric acid and the sodium hydroxide can be recycled.
Description
Technical Field
The invention relates to the field of treatment of industrial wastewater recovered from waste lithium iron phosphate, in particular to a treatment process for dissolving aluminum foil wastewater by a waste lithium iron phosphate alkali dissolution method.
Background
The lithium ion battery is a rechargeable electrochemical battery with the best technical performance in the world at present, has the advantages of high working voltage, large specific energy, long cycle life, small self-discharge, no memory effect, no pollution and the like, and is widely applied to the fields of mobile communication, notebook computers, portable tools, electric bicycles, electric automobiles and the like. However, the wide use of the lithium ion batteries is accompanied by the generation of a large amount of waste lithium ion batteries, and if the waste lithium ion batteries are discarded at will, not only the environment is polluted, but also the resources are seriously wasted. Therefore, the waste lithium ion battery and the waste material generated by the waste lithium ion battery are recycled, and good economic benefit, social benefit and environmental benefit can be generated. The waste lithium ion battery has a plurality of recyclable components, mainly contains valuable metals such as nickel, cobalt, copper, iron, aluminum, lithium and the like, belongs to primary resources, and has high recycling value. At present, people mainly concentrate on recycling active materials in a positive plate and research on separation and recovery of copper foils on the positive plate.
At the present stage of recovering the lithium ion battery anode aluminum foil, methods such as a neutralization method, a hot melting method, an alkaline leaching method, an organic solvent extraction method and the like are mainly used for recovering aluminum in lithium ion battery waste, but the effect of the neutralization method is not ideal, and the organic solvent in the organic solvent extraction method is harmful to human bodies. The cost of the extracting agent is higher than that of an alkaline leaching method, the cost of sodium hydroxide required by the alkaline leaching method is relatively lower, the technology is mature, and the method is a mainstream recovery method of the lithium ion battery aluminum foil.
Disclosure of Invention
The invention aims to provide a treatment process for aluminum foil dissolving wastewater by an alkali dissolution method of waste lithium iron phosphate, which comprehensively solves the problem that in the prior art, organic matters such as sodium aluminate solution binder, conductive agent and the like have high influence on the purity of subsequent products and the COD of the wastewater; the sodium sulfate wastewater is evaporated in multiple effects, the evaporation cost is extremely high, the sodium sulfate product value is low, a large amount of organic wastewater is generated by evaporation, and the like.
The invention provides a process combining a ceramic membrane, a nanofiltration membrane, reverse osmosis and a bipolar membrane for solving the problems. The nanofiltration membrane is used for separation and purification, the reverse osmosis is used for concentrating salt and preparing pure water to be returned to enterprises for continuous use, the salt concentrated solution is separated into acid and alkali through the bipolar membrane to be returned to the enterprises for reuse, the whole process is simple and efficient, the environmental protection pressure of the enterprises is relieved, and the production cost of the enterprises is reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a treatment process for aluminum foil dissolving wastewater by an alkaline dissolution method of waste lithium iron phosphate, which is characterized by comprising the following steps of:
s1, filtering by using a plate-and-frame filter press: filtering particle impurities and suspended matters in the sodium metaaluminate solution to respectively obtain a first filter pressing solution and filter residues, and returning the filter residues to the previous stage process for continuously dissolving alkali;
s2, filtering the first press filtrate obtained in the step S1 through a ceramic membrane to obtain a ceramic membrane concentrated phase and a ceramic membrane clear phase, and returning the ceramic membrane concentrated phase to pretreatment active substance recovery equipment;
s3, passing the ceramic membrane clear phase obtained in the step S2 through a nanofiltration membrane separation device I to obtain a nanofiltration membrane concentrated phase I and a nanofiltration membrane clear phase I;
s4, passing the clear phase I of the nanofiltration membrane obtained in the step S3 through a first reverse osmosis concentration device to obtain a first reverse osmosis concentrated phase and a first reverse osmosis clear phase, mixing the first reverse osmosis concentrated phase with the first nanofiltration membrane concentrated phase, and using the first reverse osmosis clear phase as aluminum hydroxide washing water;
s5, adding sulfuric acid into the nanofiltration membrane concentrated phase I obtained in the step S3 to obtain an acid conditioning solution, performing pressure filtration on the acid conditioning solution through a plate and frame II, and washing to obtain a second filter pressing solution, a filter residue aluminum hydroxide product and washing wastewater;
s6, enabling the second pressure filtrate obtained in the step S5 to pass through a second nanofiltration membrane separation device to obtain a second nanofiltration membrane concentrated phase and a second nanofiltration membrane clear phase, and returning the second nanofiltration membrane concentrated phase to the step S3 to be mixed with the first nanofiltration membrane concentrated phase;
s7, concentrating the clear phase two of the nanofiltration membrane obtained in the step S6 by a reverse osmosis concentration device II to obtain a reverse osmosis concentrated phase two and a reverse osmosis clear phase two;
s8, concentrating the reverse osmosis clear phase II obtained in the step S7 by a reverse osmosis concentration device III to obtain a reverse osmosis concentrated phase III and a reverse osmosis clear phase III, mixing the reverse osmosis concentrated phase III with the S6 nanofiltration membrane concentrated phase II, and using the reverse osmosis clear phase III as aluminum hydroxide washing water;
and S9, feeding the reverse osmosis concentrated phase II obtained in the step S7 into a bipolar membrane salt chamber, ionizing to obtain sulfuric acid and sodium hydroxide, returning the sulfuric acid to the step S5, and using the sulfuric acid as an acid conditioning solution, wherein the sodium hydroxide is used as an alkali-leaching aluminum foil.
Further, the first medium-pressure filtrate in the step S2 meets the turbidity less than 10 NTU.
Further, in the step S2, polymer ceramic membranes are adopted for filtration, and the filtration flux is 200-1000L per square meter per hour; the operation flow rate is as low as 1m/s, and the operation pressure is 0.1-0.3 Mpa; the obtained ceramic membrane concentrated phase I and the ceramic membrane clear phase I both meet the turbidity less than 10 NTU.
Further, in the step S3, when the nanofiltration membrane separation device I is used for separation and purification, the operation pressure is 0.5-4 Mpa, and the operation temperature is 20-40 ℃; TDS in the obtained nanofiltration membrane concentrated phase I is 20-50 g/L, and TDS in the obtained nanofiltration membrane clear phase I is 5-10 g/L.
Further, in the step S4, when the reverse osmosis membrane concentration device I carries out concentration and purification, the operation pressure is 0.5 Mpa-4 Mpa, and the operation temperature is 20-40 ℃; the TDS in the obtained reverse osmosis concentrated phase I is 15-30 g/L, and the TDS in the obtained reverse osmosis clear phase I is 0.005-0.01 g/L.
Further, in the step S5, sulfuric acid is added to adjust the PH to 5.5 to 7.5, so as to obtain an acid adjustment solution.
Further, in the step S6, when the nanofiltration membrane separation device II is used for separation and purification, the operation pressure is 0.5MPa to 4MPa, and the operation temperature is 20 ℃ to 40 ℃; TDS in the obtained nanofiltration membrane concentrated phase II is 3.3-10.5 g/L, and TDS in the obtained nanofiltration membrane clear phase II is 25-45 g/L.
Further, in the step S7, when the reverse osmosis membrane concentration device ii performs concentration treatment, the operation pressure is 0.5Mpa to 8Mpa, and the operation temperature is 20 ℃ to 40 ℃; TDS in the obtained reverse osmosis concentrated phase II reaches 60-120 g/L, and TDS in the obtained reverse osmosis clear phase II is 0.5-15 g/L.
Further, in the step S8, the reverse osmosis clear phase second feed liquid enters a reverse osmosis membrane concentration device III for concentration treatment, wherein the operation pressure is 0.5 Mpa-8 Mpa, and the operation temperature is 20-40 ℃; the TDS of the obtained reverse osmosis concentrated phase III reaches 5-30 g/L, and the TDS of the obtained reverse osmosis clear phase III is 0.01-0.05 g/L.
Further, in the step S9, the reverse osmosis concentrated phase II enters a bipolar membrane salt chamber, sodium sulfate is separated into sulfuric acid and sodium hydroxide which are respectively recycled and used by enterprises, the current of the bipolar membrane is 50-200A, the voltage is 100-500V, the water recovery rate is 30-70%, and the desalination rate is 80-90%.
Based on the technical scheme, the embodiment of the invention at least can produce the following technical effects:
(1) According to the treatment process for dissolving the aluminum foil wastewater by the waste lithium iron phosphate alkali dissolution method, organic matters are intercepted by using the special ceramic membrane in the pretreatment ceramic membrane process section, so that the pollution of the organic matters and the like to the membrane is avoided, and the product quality is ensured.
(2) According to the treatment process for dissolving aluminum foil wastewater by using the waste lithium iron phosphate alkali dissolution method, after a clear phase of a ceramic membrane obtained by alkaline leaching of aluminum foil mother liquor is subjected to separation treatment by using a first nanofiltration membrane device, a concentrated phase of a nanofiltration membrane is adjusted to pH 4-5 by using sulfuric acid, aluminum hydroxide floc is obvious, a plate frame is very easy to filter, and aluminum precipitation is complete. No aluminum is separated out after the salt concentration is ensured, and the subsequent bipolar membrane has higher and more stable ionization efficiency.
(3) The treatment process for aluminum foil dissolving wastewater by the waste lithium iron phosphate alkali dissolution method provided by the invention adopts a continuous flow-through membrane process combined with a special high-pollution-resistance acid-resistant membrane to realize concentration and recovery of residual acid and salt in the aluminum foil dissolving mother liquor and aluminum hydroxide rinsing water by the waste lithium iron phosphate alkali dissolution method, the concentration of the concentrated phase (reverse osmosis concentrated phase two) salt can reach 150-180g/L, the membrane dehydration amount is large, and the stable operation and the current efficiency of a rear-section bipolar membrane are ensured.
(4) The treatment process for dissolving aluminum foil wastewater by the waste lithium iron phosphate alkali dissolution method provided by the invention has the advantages that sodium aluminate wastewater is recovered in the step S4; aluminum hydroxide rinsing wastewater is recovered in step S7; a reverse osmosis concentrated phase III which can use a bipolar membrane to ionize sulfuric acid and sodium hydroxide for recycling and production is obtained in the step S8; in addition, from the view of operation cost consumption, the cost of removing 1 ton of water by the traditional evaporation process is 45-55 yuan, the value of sodium sulfate serving as a byproduct is low, the cost of removing 1 ton of water by membrane concentration is 3-5 yuan, and sodium hydroxide and sulfuric acid obtained by ionization are continuously returned to enterprises for use; compared with the treatment process in the prior art, the invention has lower consumption cost and obvious project economic benefit.
(5) The treatment process for dissolving aluminum foil wastewater by the waste lithium iron phosphate alkali dissolution method provided by the invention has the advantages that the applied treatment equipment is high in integration, small in equipment volume and small in occupied area, and can exert greater energy efficiency in a limited space.
(6) According to the treatment process for aluminum foil dissolving wastewater by the waste lithium iron phosphate alkali dissolution method, provided by the invention, the waste lithium iron phosphate alkali dissolution method aluminum foil mother liquor and rinsing water thereof are subjected to graded treatment by a combined process of micro-porous filtration, a plate-and-frame filter press, an organic ceramic membrane, an acid-base-resistant nanofiltration membrane and multi-stage high-pollution-resistance reverse osmosis membrane concentration filtration, so that the concentration filtration of all stages of reverse osmosis membranes is protected from being influenced by aluminum ions and organic matters, the continuous and stable production of the multi-stage membrane system is realized, the overall production running cost is low, the resource recovery rate is high, the wastewater is recycled, and the project zero discharge is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a process flow diagram of an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. In addition, the technical solutions in the embodiments may be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the technical solutions should be considered that the combination does not exist, and the technical solutions are not within the protection scope of the present invention.
The purpose of the invention is realized by the following technical scheme:
1. description of the apparatus:
ceramic membrane device: all the components are connected with an organic ceramic membrane filter element provided by fluid separation technology, inc. for filtration, the model of the membrane is LJ6T-MF9050, the cut-off molecular weight is 10KD-300KD, the operating pressure is 0.1-0.3MPa, the operating temperature is 0-50 ℃, and the tolerance to PH is 0-11; the filtration flux is 200-1000L/square meter.h; the operation flow rate of the ceramic membrane is as low as 1m/s, and the operation pressure is 0.1-0.3Mpa.
The first nanofiltration membrane concentration device and the second nanofiltration membrane concentration device adopt the acid-resistant nanofiltration membrane which is connected with the fluid separation technology company Limited, and the types are as follows: LJ6T-NF5 8040F35,4MPa; the reverse osmosis membrane concentration device III adopts a reverse osmosis membrane element with high desalination rate, which is connected with the fluid separation technology company Limited.
The first reverse osmosis membrane concentration device and the second reverse osmosis membrane concentration device adopt an acid-resistant high-pressure reverse osmosis membrane which is connected with fluid separation technology company Limited, and the model is as follows: LJ6T-RO5 8040F35, 8MPa; the reverse osmosis membrane concentration device III adopts a reverse osmosis membrane element with high desalination rate which is connected with the fluid separation technology company Limited.
A bipolar membrane device: and (4) separating the salt from the concentrated salt obtained by the membrane concentration treatment by using a bipolar membrane, and separating to obtain acid and alkali. The bipolar membrane has a current of 50-300A, a voltage of 100-500V, a water recovery rate of 30-70% and a desalination rate of 80-90%.
2. Example (b):
a treatment process for aluminum foil dissolving wastewater of waste lithium iron phosphate by an alkali dissolution method comprises the following steps:
s1, filtering by using a plate-and-frame filter press: filtering particle impurities and suspended matters in the sodium aluminate solution to respectively obtain a first filter pressing solution and filter residues, and returning the filter residues to the former stage process for continuously dissolving alkali;
s2, further treating the first press filtrate obtained in the step S1 through an organic ceramic membrane, wherein the cut-off molecular weight of a ceramic membrane filtering element adopted in the organic ceramic membrane device I is 200KD, when the ceramic device is used for filtering, the operating pressure is 0.2Mpa, the operating temperature is 40 ℃, so that a ceramic membrane concentrated phase and a ceramic membrane clear phase are obtained, the COD of the ceramic membrane clear phase is reduced to be less than 5mg/L from 2600mg/L, the turbidity is less than 10 NTU, and the COD of the ceramic membrane concentrated phase is 8910mg/L and returns to the pretreatment active material recovery equipment;
s3, passing the clear phase of the ceramic membrane obtained in the step S2 through a first nanofiltration membrane, wherein the increase trend of the operating pressure is 0.5-3.5Mpa and the operating temperature is 40 ℃ when the first nanofiltration membrane is separated and purified by a device, so that the content of aluminum in the dense phase of the nanofiltration membrane is increased to 11.78g/L from 5.49g/L and the content of aluminum in the clear phase of the nanofiltration membrane is less than 200PPm;
s4, the clear nanofiltration membrane obtained in the step S3 is subjected to a first reverse osmosis process, the change trend of the operating pH of the first reverse osmosis device is 9.3-8.9, the operating pressure is 5.5Mpa, the operating temperature is 40 ℃, a first reverse osmosis concentrated phase TDS (total dissolved solids) is 23.46 g/L and a first reverse osmosis clear phase TDS is 0.006g/L, the first reverse osmosis concentrated phase is mixed with the first nanofiltration membrane, and the first reverse osmosis clear phase is returned to an enterprise to be used as aluminum hydroxide washing water;
s5, adding the nanofiltration membrane obtained in the step S4 in concentrated phase, regulating the pH value to 6.8 with sulfuric acid to obtain an acid regulating solution, and performing filter pressing and washing on the acid regulating solution through a plate frame II to obtain a filter pressing solution II, a filter residue aluminum hydroxide product and washing wastewater;
s6, enabling the second pressure filtrate obtained in the step S5 to pass through a second nanofiltration membrane, wherein when a second nanofiltration membrane device is used for separation and purification, the operation pressure is 3.4Mpa, the operation temperature is 40 ℃, the obtained second nanofiltration membrane concentrated phase TDS is 9.8g/L, and the obtained second nanofiltration membrane clear phase TDS is 36.78g/L, and returning the second nanofiltration membrane concentrated phase to the S3 to be mixed with the first nanofiltration membrane concentrated phase;
s7, concentrating the clear nanofiltration membrane phase obtained in the step S6 through a reverse osmosis secondary device, wherein the concentration operation pH of the reverse osmosis secondary device is 7.11, the operation pressure is 7.5Mpa, the operation temperature is 40-42 ℃, and the obtained reverse osmosis concentrated phase secondary TDS reaches 131.52g/L and the reverse osmosis clear phase secondary TDS is 9.33g/L;
s8, concentrating and purifying the reverse osmosis clear phase obtained in the step S7 by a reverse osmosis triple device, wherein the trend of the operation pressure of the reverse osmosis triple device is 5.5Mpa, the operation temperature is 38 ℃, the obtained reverse osmosis concentrated phase three TDS reaches 12.5g/L, the obtained reverse osmosis clear phase three TDS is 0.02g/L, the reverse osmosis concentrated phase three is mixed with the S6 nanofiltration membrane concentrated phase, the conductivity of the reverse osmosis clear phase three is 12us/cm, and the reverse osmosis clear phase three is recycled for production and returned to enterprises to be used as aluminum hydroxide washing water;
and S9, feeding the reverse osmosis concentrated phase II obtained in the step S7 into a bipolar membrane salt chamber for salt separation, ionizing by a bipolar membrane device to obtain 5% sulfuric acid and 5% sodium hydroxide, returning the 5% sulfuric acid to the step S5 as an acid adjusting solution, returning the 5% sodium hydroxide to an enterprise for serving as an alkaline leaching solution for alkaline leaching of aluminum foil, and returning to the step S6 when the concentration of sodium sulfate is reduced to 3.5% to be mixed with the concentrated phase II of the nanofiltration membrane.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A treatment process for aluminum foil dissolving wastewater of waste lithium iron phosphate by an alkali dissolution method is characterized by comprising the following steps:
s1, filtering by using a plate-and-frame filter press: filtering particle impurities and suspended matters in the sodium metaaluminate solution to respectively obtain a first filter pressing solution and filter residues, and returning the filter residues to the previous stage process for continuously dissolving alkali;
s2, filtering the first press filtrate obtained in the step S1 through a ceramic membrane to obtain a ceramic membrane concentrated phase and a ceramic membrane clear phase, and returning the ceramic membrane concentrated phase to pretreatment active substance recovery equipment;
s3, passing the ceramic membrane clear phase obtained in the step S2 through a nanofiltration membrane separation device I to obtain a nanofiltration membrane concentrated phase I and a nanofiltration membrane clear phase I;
s4, passing the clear phase I of the nanofiltration membrane obtained in the step S3 through a first reverse osmosis concentration device to obtain a first reverse osmosis concentrated phase and a first reverse osmosis clear phase, mixing the first reverse osmosis concentrated phase with the first nanofiltration membrane concentrated phase, and using the first reverse osmosis clear phase as aluminum hydroxide washing water;
s5, adding sulfuric acid into the nanofiltration membrane concentrated phase I obtained in the step S3 to obtain an acid conditioning solution, performing pressure filtration on the acid conditioning solution through a plate and frame II, and washing to obtain a second filter pressing solution, a filter residue aluminum hydroxide product and washing wastewater;
s6, enabling the second pressure filtrate obtained in the step S5 to pass through a second nanofiltration membrane separation device to obtain a second nanofiltration membrane concentrated phase and a second nanofiltration membrane clear phase, and returning the second nanofiltration membrane concentrated phase to the step S3 to be mixed with the first nanofiltration membrane concentrated phase;
s7, concentrating the clear phase II of the nanofiltration membrane obtained in the step S6 by a reverse osmosis concentration device II to obtain a reverse osmosis concentrated phase II and a reverse osmosis clear phase II;
s8, concentrating the reverse osmosis clear phase II obtained in the step S7 by a reverse osmosis concentration device III to obtain a reverse osmosis concentrated phase III and a reverse osmosis clear phase III, mixing the reverse osmosis concentrated phase III with the S6 nanofiltration membrane concentrated phase II, and using the reverse osmosis clear phase III as aluminum hydroxide washing water;
and S9, feeding the reverse osmosis concentrated phase II obtained in the step S7 into a bipolar membrane salt chamber, ionizing to obtain sulfuric acid and sodium hydroxide, returning the sulfuric acid to the step S5, and using the sulfuric acid as an acid conditioning solution, wherein the sodium hydroxide is used as an alkali-leaching aluminum foil.
2. The treatment process for aluminum foil dissolving wastewater by the alkaline dissolution method of waste lithium iron phosphate as claimed in claim 1, wherein the turbidity of the medium-pressure filtrate in the step S2 is less than 10 NTU.
3. The treatment process for dissolving aluminum foil wastewater by the waste lithium iron phosphate alkali dissolution method according to claim 1, wherein in the step S2, a polymer ceramic membrane is adopted for filtration, and the filtration flux is 200-1000L/square meter.h; the operation flow rate is as low as 1m/s, and the operation pressure is 0.1-0.3 Mpa; the obtained ceramic membrane concentrated phase I and the ceramic membrane clear phase I both meet the turbidity less than 10 NTU.
4. The treatment process for the waste lithium iron phosphate alkali dissolution aluminum foil dissolving wastewater according to claim 1, wherein in the step S3, when a nanofiltration membrane separation device is used for separation and purification, the operation pressure is 0.5MPa to 4MPa, and the operation temperature is 20 ℃ to 40 ℃; the TDS in the obtained nanofiltration membrane concentrated phase I is 20-50 g/L, and the TDS in the obtained nanofiltration membrane clear phase I is 5-10 g/L.
5. The treatment process for dissolving aluminum foil wastewater by the waste lithium iron phosphate alkali dissolution method according to claim 1, wherein in the step S4, when a reverse osmosis membrane concentration device I performs concentration and purification, the operation pressure is 0.5-4 Mpa, and the operation temperature is 20-40 ℃; the TDS in the obtained reverse osmosis concentrated phase I is 15-30 g/L, and the TDS in the obtained reverse osmosis clear phase I is 0.005-0.01 g/L.
6. The treatment process for aluminum foil dissolving wastewater by the waste lithium iron phosphate alkali dissolution method according to claim 1, wherein in the step S5, sulfuric acid is added to adjust the pH value to 5.5-7.5.
7. The treatment process for the waste lithium iron phosphate alkali dissolution aluminum foil dissolving wastewater according to claim 1, wherein in the step S6, when a second nanofiltration membrane separation device is used for separation and purification, the operation pressure is 0.5MPa to 4MPa, and the operation temperature is 20 ℃ to 40 ℃; TDS in the obtained nanofiltration membrane concentrated phase II is 3.3-10.5 g/L, and TDS in the obtained nanofiltration membrane clear phase II is 25-45 g/L.
8. The treatment process for dissolving aluminum foil wastewater by the alkaline dissolution method of waste lithium iron phosphate according to claim 1, wherein in the step S7, when a reverse osmosis membrane concentration device II performs concentration treatment, the operation pressure is 0.5MPa to 8MPa, and the operation temperature is 20 ℃ to 40 ℃; TDS in the obtained reverse osmosis concentrated phase II reaches 60-120 g/L, and TDS in the obtained reverse osmosis clear phase II is 0.5-15 g/L.
9. The treatment process for dissolving aluminum foil wastewater by the waste lithium iron phosphate alkali dissolution method according to claim 1, wherein in the step S8, the reverse osmosis clear phase two liquid enters a reverse osmosis membrane concentration device III for concentration treatment, the operating pressure is 0.5-8 Mpa, and the operating temperature is 20-40 ℃; the TDS of the obtained reverse osmosis concentrated phase III reaches 5-30 g/L, and the TDS of the obtained reverse osmosis clear phase III is 0.01-0.05 g/L.
10. The process for treating waste water produced by dissolving aluminum foil in waste lithium iron phosphate by the alkaline dissolution method according to claim 1, wherein in the step S9, a reverse osmosis concentrated phase II enters a bipolar membrane salt chamber, sodium sulfate is separated into sulfuric acid and sodium hydroxide which are respectively recycled and reused by enterprises, the bipolar membrane has a current of 50-200A, a voltage of 100-500V, a water recovery rate of 30-70% and a desalination rate of 80-90%.
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