Phosphoric acid molten iron treatment system

Abstract

The utility model discloses a molten iron phosphate treatment system which comprises a washing water ceramic membrane filter for filtering iron phosphate washing water and a mother liquor ceramic membrane filter for filtering iron phosphate mother liquor, the buffer pool is respectively communicated with concentrated water outlets of the washing water ceramic membrane filter and the mother liquor ceramic membrane filter through concentrated drainage pipelines so as to collect concentrated water, and the condensate water tanks are respectively communicated with the concentrated drainage pipelines so as to provide condensate water for washing the concentrated drainage pipelines. According to the molten phosphoric acid treatment system disclosed by the utility model, the washing water ceramic membrane filter and the mother liquor ceramic membrane filter are respectively adopted to filter and remove impurities from washing water and mother liquor, and concentrated water obtained from the washing water and the mother liquor is respectively collected into the buffer pool through respective independent concentrated discharge pipelines without mutual interference, so that the stability of concentrated discharge quantity is improved; therefore, the filtering stability of the ceramic membrane filter is improved.

Description

Technical Field

[0001] The utility model belongs to the field of water treatment systems, in particular to an iron phosphate water treatment system. Background Art

[0002] During the production of iron phosphate, a positive electrode material for lithium batteries, the mother liquor ceramic membrane and wash water ceramic membrane processes in the water treatment device of the water treatment device are operated. After the solid-liquid separation process of filtering out the precipitate is adopted, the concentrated water generated respectively is merged through pipelines and sent to the downstream process together. However, because the two concentrate discharge pipelines are merged into one pipeline before entering the next process, mutual interference will be caused, resulting in unstable concentrate discharge volume, causing unstable operation of the ceramic membrane, and because the salt and sediment concentrations of the concentrate are high, when there are fluctuations, it is easy to adhere to the inner wall of the pipeline, forming scale attached to the inner wall of the pipeline, causing the pipeline to slowly become blocked, and the concentrate cannot be discharged normally, which is easy to cause damage to the ceramic membrane and affect the water quality of the produced water, resulting in the inability to achieve the process requirements and the poor operation of the device. Utility Model Content

[0003] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a ferric phosphate water treatment system that can prevent the concentrated discharge pipeline from being blocked and does not affect the concentrated discharge volume.

[0004] Technical solution: The iron phosphate water treatment system of the utility model includes a wash water ceramic membrane filter for filtering iron phosphate wash water, a mother liquor ceramic membrane filter for filtering iron phosphate mother liquor, which are respectively connected to the concentrate outlets of the wash water ceramic membrane filter and the mother liquor ceramic membrane filter through concentrate discharge pipelines, a buffer tank for collecting concentrate water, and condensate tanks respectively connected to the concentrate discharge pipelines to provide condensate water for flushing the concentrate discharge pipelines.

[0005] Furthermore, the system also includes a circulation tank connected to the upstream end of the wash water ceramic membrane filter and the upstream end of the mother liquid ceramic membrane filter respectively.

[0006] Furthermore, the system also includes plate and frame filter presses respectively connected to the upstream ends of the circulation tanks.

[0007] Furthermore, the clean water discharge port of the mother liquid ceramic membrane filter of the system is connected to the MVR evaporation system, and the condensed water of the MVR evaporation system is circulated into the condensed water tank.

[0008] Furthermore, the clean water discharge port of the mother liquid ceramic membrane filter of the system is connected to the MVR evaporation system, and the condensed water of the MVR evaporation system is circulated into the condensed water tank.

[0009] Furthermore, a plurality of stages of RO membrane filters are connected between the mother liquor ceramic membrane filter and the MVR evaporation system of the system. The concentrated liquid obtained after filtering through the plurality of stages of RO membrane filters is evaporated and concentrated by the MVR evaporation system, and the clear liquid obtained after filtering through the plurality of stages of RO membrane filters is circulated to the wash water ceramic membrane filter for re-filtration.

[0010] Furthermore, a plurality of stages of RO membrane filters are connected between the mother liquor ceramic membrane filter and the MVR evaporation system of the system. The concentrated liquid obtained after filtering through the plurality of stages of RO membrane filters is evaporated and concentrated by the MVR evaporation system, and the clear liquid obtained after filtering through the plurality of stages of RO membrane filters is circulated to the wash water ceramic membrane filter for re-filtration.

[0011] Furthermore, the clean water discharge port of the water washing ceramic membrane filter of the system is connected to several stages of RO membrane filters. The pure water obtained after filtering through several stages of RO membrane filters is used as standby water, and the mother liquor obtained after filtering through several stages of RO membrane filters is circulated to the mother liquor ceramic membrane filter for re-filtration.

[0012] Beneficial effects: Compared with the prior art, the advantages of the utility model are as follows: the iron phosphate water treatment system uses a wash water ceramic membrane filter and a mother liquor ceramic membrane filter to filter and remove impurities from the wash water and mother liquor, and the concentrated water obtained from the two is collected in the buffer tank through their own independent concentrated discharge pipelines, without interfering with each other, thereby improving the stability of the concentrated discharge volume, and thus improving the filtering stability of the ceramic membrane filter; and based on the setting of the condensate tank, the concentrated discharge pipeline can be independently flushed with condensate water regularly, effectively preventing the occurrence of blockage. In addition, the system further circulates the condensate obtained by the MVR evaporation system after water treatment to the condensate tank, making full use of the resources generated by the system and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure diagram of the water treatment system of the utility model is shown in FIG. Figure 1 ;

[0014] Figure 2 The structure diagram of the water treatment system of the utility model is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0015] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] The iron phosphate water treatment system of the utility model comprises a wash water ceramic membrane filter 1 connected to an iron phosphate wash water pipe, a mother liquor ceramic membrane filter 2 connected to an iron phosphate mother liquor pipe, a buffer tank 3 connected to a concentrated water outlet of the wash water ceramic membrane filter 1 and a concentrated water outlet of the mother liquor ceramic membrane filter 2 through a concentrated water discharge pipeline, and a condensed water tank 4 connected to the concentrated water discharge pipeline to provide condensed water for flushing the interior of the concentrated water discharge pipeline and thereby remove deposited salts and sediments. The flushing water in the concentrated water discharge pipeline, the concentrated water filtered by the wash water ceramic membrane filter and the mother liquor ceramic membrane filter are all collected in the buffer tank 3. Figure 1 It should be noted that the buffer tank 3 used in the utility model is actually a water storage tank, and the condensed water tank 4 is a water storage tank that can keep the water temperature constant at 40-70°C. The wash water ceramic membrane filter and the mother liquid ceramic membrane filter are both chemical equipment known in the art, and the utility model does not make specific limitations and descriptions.

[0017] Example 1

[0018] Based on the iron phosphate water treatment system composed of the wash water ceramic membrane filter 1, the mother liquor ceramic membrane filter 2, the buffer tank 3 and the condensed water tank 4 of the utility model, when the impurity content of the concentrated water obtained after filtering through the wash water ceramic membrane filter 1 and the mother liquor ceramic membrane filter 2 is relatively small, a circulation tank 5 can be respectively set at the upstream end of the wash water ceramic membrane filter 1 and the mother liquor ceramic membrane filter 2, so that the concentrated water can be collected by the circulation tank 5 and filtered again.

[0019] Example 2

[0020] Based on the iron phosphate water treatment system composed of the wash water ceramic membrane filter 1, the mother liquor ceramic membrane filter 2, the buffer tank 3 and the condensed water tank 4 of the utility model, in order to reduce the clogging damage caused by impurities in the iron phosphate wash water and the iron phosphate mother liquor to the ceramic membrane filter, plate and frame filter presses can be connected to the upstream ends of the wash water ceramic membrane filter 1 and the mother liquor ceramic membrane filter 2 respectively to perform preliminary filtration of large particle impurities.

[0021] Example 3

[0022] Based on the iron phosphate water treatment system composed of the wash water ceramic membrane filter 1, the mother liquor ceramic membrane filter 2, the buffer tank 3, the condensate tank 4 and the circulation tank 5 set in Example 1, the water treatment system can simultaneously set a plate and frame filter press at the upstream end of the circulation tank 5 to perform preliminary filtration of large particle impurities.

[0023] Example 4

[0024] Based on the iron phosphate water treatment system composed of the wash water ceramic membrane filter 1, the mother liquor ceramic membrane filter 2, the buffer tank 3 and the condensate tank 4 of the utility model, the clean water obtained after passing through the mother liquor ceramic filter 2 can be further evaporated and crystallized by connecting to the MVR evaporation system 6 arranged at the downstream end of the mother liquor ceramic membrane filter to obtain condensate water and corresponding salt substances respectively, and the condensate water can be circulated to the condensate tank 4 through the connecting pipe for repeated recycling, thereby making full use of resources and reducing costs.

[0025] Example 5

[0026] Based on Example 1 and Example 4, the iron phosphate water treatment system is composed of a circulation tank 5 connected to the iron phosphate washing water pipeline and a washing water ceramic membrane filter 1 connected to the circulation tank 5, a circulation tank 5 connected to the iron phosphate mother liquor pipeline, a mother liquor ceramic membrane filter 2 connected to the circulation tank 5, a buffer tank 3 connected to the concentrated water outlet of the washing water ceramic membrane filter and the concentrated water outlet of the mother liquor ceramic membrane filter through concentrated drainage pipelines, respectively, a condensate tank 4 connected to the washing water concentrated drainage pipeline and the mother liquor concentrated drainage pipeline, respectively, to provide condensate water for flushing the two, and the clear water outlet of the mother liquor ceramic membrane filter 2 is connected to the MVR evaporation system 6, and the condensate obtained by evaporation and crystallization of the MVR evaporation system 6 is circulated to the condensate tank 4 again.

[0027] Example 6

[0028] Based on Example 2 and Example 4, the iron phosphate water treatment system is composed of a plate and frame filter press connected to the iron phosphate wash water pipeline, a wash water ceramic membrane filter 1 connected to the plate and frame filter press, a plate and frame filter press connected to the iron phosphate mother liquor pipeline, a mother liquor ceramic membrane filter 2 connected to the plate and frame filter press, a buffer tank 3 connected to the concentrate outlet of the wash water ceramic membrane filter 1 and the concentrate outlet of the mother liquor ceramic membrane filter 2 through concentrate discharge pipelines, respectively, a condensate tank 4 connected to the wash water concentrate discharge pipeline and the mother liquor concentrate discharge pipeline, respectively, to provide condensate water for flushing the two, and the clear water outlet of the mother liquor ceramic membrane filter 2 is connected to the MVR evaporation system 6, and the condensate obtained by evaporation and crystallization of the MVR evaporation system 6 is circulated to the condensate tank 4 again.

[0029] Example 7

[0030] Based on Example 3 and Example 4, the iron phosphate water treatment system is composed of a plate and frame filter press connected to the iron phosphate washing water pipeline, a circulation tank 5 connected to the plate and frame filter press, a washing water ceramic membrane filter 1 connected to the circulation tank 5, a plate and frame filter press connected to the iron phosphate mother liquor pipeline, a circulation tank 5 connected to the plate and frame filter press, a mother liquor ceramic membrane filter 2 connected to the circulation tank 5, a buffer tank 3 connected to the concentrated water outlet of the washing water ceramic membrane filter 1 and the concentrated water outlet of the mother liquor ceramic membrane filter 2 through concentrated drainage pipelines, respectively, a condensate tank 4 connected to the washing water concentrated drainage pipeline and the mother liquor concentrated drainage pipeline, respectively, to provide condensate water for flushing the two, and the clear water outlet of the mother liquor ceramic membrane filter 2 is connected to the MVR evaporation system 6, and the condensate obtained by evaporation and crystallization of the MVR evaporation system 6 is circulated to the condensate tank 4 again.

[0031] Example 8

[0032] Based on the water treatment system structure of Example 4, Example 5, Example 6 or Example 7, the water treatment may also include several stages of RO membrane filters 7 disposed between the mother liquor ceramic membrane filter 2 and the MVR evaporation system 6. The specific number of stages may be flexibly selected according to actual purification requirements, preferably 1-3 stages. The concentrated solution purified by several stages of RO membrane filters 7 passes through MVR evaporation crystallization 6, and the obtained clean water is circulated to the wash water purification system, and may be circulated to the circulation tank 5 or directly circulated to the wash water ceramic membrane filter 1 for wash water purification.

[0033] Example 9

[0034] Based on the water treatment system structure of Example 8, the water treatment system may also include a plurality of RO membrane filters 7 arranged at the downstream end of the wash water ceramic membrane filter. The specific number of stages can be flexibly selected according to the actual purification requirements, preferably 1-3 stages. The concentrated liquid purified by the plurality of RO membrane filters 7 is circulated to the mother liquid purification system, and can be circulated to the circulation tank 5, or directly circulated to the mother liquid ceramic membrane filter 2; and the obtained pure water can be directly collected for subsequent use, and the water treatment system of Example 9 based on Example 7 is as follows: Figure 2 shown.

[0035] In addition to the above embodiments, it should be noted that feed pumps can be provided on each pipeline or conduit of the water treatment system of the present invention to achieve normal operation of each process. In addition, the utility model can select the two paths for the concentrated water from the mother liquid ceramic membrane filter 2 and the wash water ceramic membrane filter 1 to enter the buffer tank and the circulation tank respectively, which can be determined according to the monitoring of the impurity content of the concentrated water obtained. The two can enter in steps at the same time, but the flow rates of the two are not specifically limited.

Claims

1. A ferric phosphate water treatment system, characterized in that: The system comprises a wash water ceramic membrane filter (1) for filtering iron phosphate wash water, a mother liquor ceramic membrane filter (2) for filtering iron phosphate mother liquor, a buffer tank (3) connected to the concentrate outlets of the wash water ceramic membrane filter (1) and the mother liquor ceramic membrane filter (2) through concentrate discharge pipelines to collect concentrate water, and a condensate tank (4) connected to the concentrate discharge pipelines to provide condensate water for flushing the concentrate discharge pipelines.

2. The iron phosphate water treatment system according to claim 1, characterized in that: The system also includes a circulation tank (5) connected to the upstream end of the wash water ceramic membrane filter (1) and the upstream end of the mother liquid ceramic membrane filter (2), respectively.

3. The iron phosphate water treatment system according to claim 1 or 2, characterized in that: The system also includes plate and frame filter presses respectively connected to the upstream ends of the circulation tanks (5).

4. The iron phosphate water treatment system according to claim 1 or 2, characterized in that: The clean water discharge port of the mother liquid ceramic membrane filter (2) is connected to the MVR evaporation system (6), and the condensed water of the MVR evaporation system (6) is circulated into the condensed water tank (4).

5. The iron phosphate water treatment system according to claim 3, characterized in that: The clean water discharge port of the mother liquid ceramic membrane filter (2) is connected to the MVR evaporation system (6), and the condensed water of the MVR evaporation system (6) is circulated into the condensed water tank (4).

6. The iron phosphate water treatment system according to claim 4, characterized in that: A plurality of stages of RO membrane filters (7) are connected between the mother liquid ceramic membrane filter (2) and the MVR evaporation system (6). The concentrated liquid obtained after filtering through the plurality of stages of RO membrane filters (7) is evaporated and concentrated through the MVR evaporation system (6). The clear liquid obtained after filtering through the plurality of stages of RO membrane filters (7) is circulated to the wash water ceramic membrane filter (1) for re-filtration.

7. The iron phosphate water treatment system according to claim 5, characterized in that: A plurality of stages of RO membrane filters (7) are connected between the mother liquid ceramic membrane filter (2) and the MVR evaporation system (6). The concentrated liquid obtained after filtering through the plurality of stages of RO membrane filters (7) is evaporated and concentrated through the MVR evaporation system (6). The clear liquid obtained after filtering through the plurality of stages of RO membrane filters (7) is circulated to the wash water ceramic membrane filter (1) for re-filtration.

8. The iron phosphate water treatment system according to claim 6 or 7, characterized in that: The clean water discharge port of the wash water ceramic membrane filter (1) is connected to a plurality of stages of RO membrane filters (7). Pure water is obtained after filtering through the plurality of stages of RO membrane filters (7) for standby use. The mother liquor obtained after filtering through the plurality of stages of RO membrane filters (7) is circulated to the mother liquor ceramic membrane filter (2) for further filtration.

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