CN213623699U - Ternary precursor production washing water treatment system - Google Patents
Ternary precursor production washing water treatment system Download PDFInfo
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- CN213623699U CN213623699U CN202022643439.XU CN202022643439U CN213623699U CN 213623699 U CN213623699 U CN 213623699U CN 202022643439 U CN202022643439 U CN 202022643439U CN 213623699 U CN213623699 U CN 213623699U
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Abstract
The utility model belongs to the technical field of wastewater treatment, in particular to a ternary precursor production washing water treatment system, which comprises a washing water storage tank, a pH precipitation unit, a filtering device, a heat exchanger, a primary RO membrane system, a secondary RO membrane system, a reclaimed water storage tank, an ammonia still front liquid storage tank, an ammonia still and an MVR system which are connected; by the method for treating the washing water produced by the ternary precursor through the system, the recycling rate of the washing water produced by the ternary precursor reaches 85%, and the purposes of recycling reclaimed water, reducing the use of raw water, reducing the external discharge of waste water and building internal water circulation are achieved; meanwhile, heavy metal ions are removed; the secondary concentrated water of the secondary RO membrane system can obtain a byproduct sodium sulfate through evaporation and crystallization, ammonia water is directly recovered through deamination, steam condensate in the evaporation and crystallization process can be reused for the existing production, and MVR condensate water returns to a water washing storage tank for closed cycle treatment, so that the process flow is simplified, and the production cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment, concretely relates to ternary precursor production washing water treatment system.
Background
In recent years, the power lithium battery using ternary material as the anode material gradually occupies an increasingly important position in the power battery industry by virtue of important advantages of high capacity, large energy density, good cycle stability, moderate cost and the like. At present, the industrial ternary cathode material is generally prepared by taking hydroxides of three elements of Ni, Co and Mn as precursors, and calcining the hydroxides with lithium. The main process for generating the ternary material precursor is a coprecipitation method, wherein a solution with a certain concentration of mixed metal ions is prepared, NaOH is used as a precipitator, ammonia water is used as a complexing agent, and the mixed metal ions are added in a parallel flow manner to produce the sphere-like ternary hydroxide precursor through coprecipitation. The process can easily control the particle size, specific surface area, morphology and tap density of the precursor, but wastewater such as a washing kettle, a washing tank and the like can be generated in the production process of the ternary precursor, and the wastewater generated by washing with pure water at 50-80 ℃ in the post-treatment of the ternary precursor is collectively called washing water. The yield of washing water for producing one ton of ternary precursor product in the industry is 8-25 tons. Along with the increase of the production capacity, the produced washing water has large amount and contains nickel-cobalt metal, thereby having great influence on the surrounding environment and having the hidden danger of environmental pollution accidents. In the existing production process, after the washing water is subjected to pH regulation, precipitation and filtration, acid is added to regulate the pH value to reach the discharge standard, and the comprehensive treatment efficiency is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a ternary precursor production washing water treatment system which can improve the washing water recovery rate, reduce the wastewater discharge and collect resources.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a ternary precursor production washing water treatment system comprises a washing water storage tank, a pH precipitation unit, a filtering device, a heat exchanger, a primary RO membrane system, a secondary RO membrane system, a reclaimed water storage tank, an ammonia still front liquid storage tank, an ammonia still and an MVR system which are sequentially connected; and a concentrated water outlet of the primary RO membrane system is connected with a water inlet of the secondary RO membrane system, a concentrated water outlet of the secondary RO membrane system is connected with a front liquid storage tank of the ammonia still, and clear liquid outlets of the primary RO membrane system and the secondary RO membrane system are connected to the middle liquid storage tank.
Furthermore, a transfer tank I is connected between the filtering equipment and the heat exchanger, and a transfer tank II is connected between the primary RO membrane system and the secondary RO membrane system.
Still further, the filtration equipment is selected from one or more of a plate and frame filter press, a precision filter and a nanofiltration membrane module.
Further, the heat exchanger includes a chiller or a cooling tower, but not limited to one.
The first-stage RO membrane system comprises a normal-temperature membrane, a high-temperature membrane or a special membrane component with strong anti-fouling capability;
the two-stage RO membrane system comprises a normal-temperature membrane or a high-temperature membrane.
The method for treating the washing water produced by the ternary precursor based on the treatment system comprises the following steps:
(1) storing, collecting and transferring ternary precursor production washing water which is conveyed in a workshop in a classified manner in a washing water storage tank;
(2) the washing water is subjected to precipitation reaction through a pH precipitation unit to precipitate most of free heavy metal ions;
(3) the washing water after heavy metal ion precipitation enters filtering equipment for filtering, the filter residue is subjected to treatment such as re-dissolution and purification, the filter residue can be mixed into a normal salt solution production line, and the filtrate is transferred to a heat exchanger for cooling through a transfer tank I;
(4) pumping the washing water subjected to heavy metal removal and temperature reduction through precipitation into a primary RO (reverse osmosis) membrane system for reverse osmosis, collecting and storing primary effluent of the primary RO membrane system into a reclaimed water storage tank for use as pure water, and temporarily storing primary concentrated water in a transfer tank II;
(5) pumping primary concentrated water into a secondary RO membrane system for reverse osmosis, collecting and storing secondary effluent of the secondary RO membrane system into a reclaimed water storage tank for use as pure water, and storing, collecting and transferring secondary concentrated water into a liquid storage tank before an ammonia still;
(6) and (3) recovering ammonia from the secondary concentrated water in the ammonia still front liquid storage tank through the ammonia still, then evaporating and crystallizing the secondary concentrated water in the MVR system to obtain sodium sulfate crystal particles, and returning the MVR condensed water to the washing water storage tank for cyclic treatment.
Further, in the step (2), the pH value of the precipitation reaction is controlled within 9.8-11.2.
Further, the content of ionic heavy metal in the washing water after the heavy metal ions are precipitated is as follows: ni is less than or equal to 0.5mg/L, Co is less than or equal to 1mg/L, and Mn is less than or equal to 1 mg/L.
And (3) transferring the filtrate to a heat exchanger through a transfer tank I to cool, wherein the temperature is controlled at 25-35 ℃.
Further, the ratio of the effluent (X) to the concentrate (Y) of the primary RO membrane system and the secondary RO membrane system is the same, wherein the ratio of X, Y: x is more than or equal to 3 and less than 7, and Y is more than 3 and less than or equal to 7; preferably, the ratio of the effluent (X) to the concentrated water (Y) of the first-stage RO membrane system to the second-stage RO membrane system is 5: 5.
Furthermore, the conductivity of the primary effluent of the primary RO membrane system is less than or equal to 10 mu s/cm, and the conductivity of the secondary effluent of the secondary RO membrane system is less than or equal to 15 mu s/cm.
The utility model prepares the reclaimed water by removing heavy metals from the washing water produced by the ternary precursor, cooling and reverse osmosis of the RO membrane, the quality of the reclaimed water is the same as that of the pure water prepared by the tap water, and the reclaimed water is used as the supplement of the pure water used in production to achieve the recycling;
concentrated water in the RO membrane reverse osmosis system passes through an ammonia still, MVR and other equipment to recover ammonia and sodium sulfate, and the MVR condensed water is prepared into reclaimed water.
Compared with the prior art, the utility model realizes the recovery utilization rate of washing water in the ternary precursor production by 85 percent, achieves the purposes of reclaimed water reuse, reduces the use of raw water (including tap water), reduces the external discharge of waste water and builds internal water circulation through the implementation of the system and the corresponding process; meanwhile, valuable metal nickel-cobalt heavy metal ions are removed, and the hidden danger of environmental pollution is solved; the secondary concentrated water of the secondary RO membrane system can obtain a byproduct sodium sulfate through evaporation and crystallization, ammonia water is directly recovered through deamination, in addition, steam condensate in the evaporation and crystallization process can be reused for the existing production, and MVR condensate water returns to a water washing storage tank for circulation treatment, so that closed circulation of resources in washing water is realized, the process flow is simplified, and the production cost is reduced.
Drawings
FIG. 1 is a schematic structural view of a ternary precursor production wash water treatment system.
The notations in FIG. 1 have the following meanings: 1-washing water storage tank, 2-pH precipitation tank, 3-diaphragm plate-and-frame filter press, 4-heat exchanger, 5-first-stage RO membrane system, 6-second-stage RO membrane system, 7-reclaimed water storage tank, 8-ammonia still front liquid storage tank, 9-ammonia still, 10-MVR system, 11-transfer tank I, 12-transfer tank II and 13-cold water tower.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the following specific examples, which should not be construed as limiting the invention.
Example 1
A ternary precursor production washing water treatment system comprises a washing water storage tank 1, a pH precipitation tank 2, a diaphragm plate-and-frame filter press 3, a heat exchanger 4, a primary RO membrane system 5, a secondary RO membrane system 6, a reclaimed water storage tank 7, an ammonia still front liquid storage tank 8, an ammonia still 9 and an MVR system 10 which are connected in sequence;
a concentrated water outlet of the primary RO membrane system 5 is connected with a water inlet of the secondary RO membrane system 6, a concentrated water outlet of the secondary RO membrane system 6 is connected with a liquid storage tank 8 before an ammonia still, and clear water outlets of the primary RO membrane system 5 and the secondary RO membrane system 6 are both connected to the intermediate water storage tank 7;
a transfer tank I11 is connected between the diaphragm plate-and-frame filter press 3 and the heat exchanger 4, a transfer tank II 12 is connected between the primary RO membrane system 5 and the secondary RO membrane system 6, and the heat exchanger 4 comprises a cooling tower 13.
The primary RO membrane system 5 comprises a normal temperature membrane, a high temperature membrane or a special membrane component with strong anti-pollution capability; the two-stage RO membrane system 6 comprises a normal temperature membrane or a high temperature membrane.
Example 2
A method of treating a ternary precursor production wash water using the ternary precursor production wash water treatment system of example 1, comprising the steps of:
(1) storing, collecting and transferring the ternary precursor production washing water which is conveyed in a workshop in a classified manner in a washing water storage tank; the initial values of the washing water for the ternary precursor production of this example are shown in table 1 below:
TABLE 1 initial value of washing water for ternary precursor production
(2) The washing water is subjected to precipitation reaction through a pH precipitation unit to precipitate most of free heavy metal ions; wherein the pH control range of the precipitation reaction is 10.2-10.8; the content of ionic heavy metal in the washing water after the heavy metal ions are precipitated is as follows: ni is less than or equal to 0.5mg/L, Co is less than or equal to 1mg/L, and Mn is less than or equal to 1 mg/L;
(3) the washing water after heavy metal ion precipitation enters filtering equipment for filtering, the filter residue is subjected to treatment such as re-dissolution purification and the like, the filter residue can be mixed into a normal salt solution production line, filtrate is transferred to a heat exchanger through a transfer tank I for cooling, and the temperature is controlled to be 25-35 ℃;
(4) pumping the washing water subjected to heavy metal removal and temperature reduction through precipitation into a first-stage RO membrane system for reverse osmosis, wherein the ratio of the outlet water to the concentrated water is equal to 5: 5, collecting and storing primary outlet water of the first-stage RO membrane system into a reclaimed water storage tank for use as pure water, and recovering 50% of the washing water, wherein the conductivity of the primary outlet water of the first-stage RO membrane system is 6.5 mu s/cm, and the primary concentrated water is temporarily stored in a transfer tank II;
(5) pumping the primary concentrated water into a secondary RO (reverse osmosis) membrane system for reverse osmosis, wherein the ratio of outlet water to concentrated water is equal to 5: 5, collecting and storing secondary outlet water of the secondary RO membrane system into a reclaimed water storage tank, using the secondary outlet water as pure water, recovering 50% of the primary concentrated water, and the conductivity of the secondary outlet water of the secondary RO membrane system is 6.9 mu s/cm;
after passing through the RO membrane twice, the recycling rate of the washing water reaches 85%, and the secondary concentrated water enters a front liquid storage tank of the ammonia still for storage, collection and transfer;
the statistical results of the characteristics of the reclaimed water collected in the reclaimed water storage tank (the primary effluent of the primary RO membrane system and the secondary effluent of the secondary RO membrane system) are shown in the following table 2:
table 2 statistical results of water characteristics
(6) And (3) recovering ammonia from the secondary concentrated water in the ammonia still front liquid storage tank through the ammonia still, then evaporating and crystallizing the secondary concentrated water in the MVR system to obtain sodium sulfate crystal particles, and returning the MVR condensed water to the washing water storage tank for cyclic treatment.
The utility model removes the weight of the washing water produced by the ternary precursor, cools down and prepares the reclaimed water by RO membrane reverse osmosis, the quality of the reclaimed water is the same as that of the pure water prepared by tap water, and the reclaimed water is used as the supplement of the pure water used in production to achieve the recycling;
concentrated water in the RO membrane reverse osmosis system passes through an ammonia still, MVR and other equipment to recover ammonia and sodium sulfate, and the MVR condensed water is prepared into reclaimed water.
The utility model realizes the recycling rate of washing water in the ternary precursor production to 85 percent through the implementation of the corresponding process of the system, achieves the purposes of reclaimed water recycling, reducing the use of raw water (including running water), reducing the external discharge of waste water and building internal water circulation; meanwhile, valuable metal nickel-cobalt heavy metal ions are removed, and the hidden danger of environmental pollution is solved; the secondary concentrated water of the secondary RO membrane system can obtain a byproduct sodium sulfate through evaporation and crystallization, ammonia water is directly recovered through deamination, in addition, steam condensate in the evaporation and crystallization process can be reused for the existing production, and MVR condensate water returns to a water washing storage tank for circulation treatment, so that closed circulation of resources in washing water is realized, the process flow is simplified, and the production cost is reduced.
The above-mentioned embodiment is only the preferred embodiment of the present invention, all the basis the utility model discloses a technical entity all belongs to the utility model discloses any simple modification, modification and substitution change to what the above embodiment was done the within range of technical scheme.
Claims (4)
1. A ternary precursor production washing water treatment system is characterized by comprising a washing water storage tank, a pH precipitation unit, a filtering device, a heat exchanger, a primary RO membrane system, a secondary RO membrane system, a reclaimed water storage tank, an ammonia still front liquid storage tank, an ammonia still and an MVR system which are sequentially connected; and a concentrated water outlet of the primary RO membrane system is connected with a water inlet of the secondary RO membrane system, a concentrated water outlet of the secondary RO membrane system is connected with a front liquid storage tank of the ammonia still, and clear liquid outlets of the primary RO membrane system and the secondary RO membrane system are connected to the middle liquid storage tank.
2. The three-component precursor production wash water treatment system of claim 1, wherein a transfer tank i is connected between the filtration device and the heat exchanger, and a transfer tank ii is connected between the primary RO membrane system and the secondary RO membrane system.
3. The ternary precursor production wash water treatment system of claim 2, wherein the filtration device is selected from the group consisting of a plate and frame filter press, a precision filter, a nanofiltration membrane module, and combinations thereof.
4. The ternary precursor production wash water treatment system of claim 3, wherein the heat exchanger comprises a chiller or a cold water tower.
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| CN112299637A (en) * | 2020-11-16 | 2021-02-02 | 江西普瑞美新材料科技有限公司 | Ternary precursor production washing water treatment system and treatment method |
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| CN112299637A (en) * | 2020-11-16 | 2021-02-02 | 江西普瑞美新材料科技有限公司 | Ternary precursor production washing water treatment system and treatment method |
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