Single-stage membrane concentration device capable of realizing high-power concentration of ferric phosphate acid wastewater

Abstract

The utility model relates to the technical field of ferric phosphate acid wastewater concentration, and provides a single-stage membrane concentration device capable of realizing high-power concentration of ferric phosphate acid wastewater, which comprises a raw water tank, a booster pump, a heat exchanger, a pretreatment micron filter, a single-stage membrane concentration device, a reuse water tank, a high-pressure pump and a concentration water tank, an outlet of the raw water tank is connected with an inlet pipeline of the heat exchanger, a raw water outlet of the heat exchanger is connected with an inlet pipeline of the pretreatment micron filter, an outlet of the pretreatment micron filter is connected with an inlet pipeline of the single-stage membrane concentration device, and a concentrated water outlet of the single-stage membrane concentration device is respectively connected with the raw water tank and a concentrated water tank pipeline. And a reuse water pipeline of the single-stage membrane concentration device is connected with a reuse water tank. According to the technical scheme, the problems of high follow-up treatment difficulty and high cost easily caused by treatment of iron phosphate wastewater by a traditional process in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ferric phosphate acidic wastewater concentration, and specifically to a single-stage membrane concentration device capable of achieving high-fold concentration of ferric phosphate acidic wastewater. Background Art

[0002] Lithium is the raw material for cathode materials and a key component of electric vehicle batteries. As demand for electric vehicles increases, so does the demand for lithium, impacting lithium iron phosphate batteries. Iron phosphate is currently the ideal precursor for lithium iron phosphate, the battery cathode material. As demand for batteries grows, so too does the demand for iron phosphate. The production process for iron phosphate involves synthesis and washing. The resulting mother liquor and wash water have an acidic pH. After a single cooling step, the water temperature reaches 30-35°C. The mother liquor contains sulfate ions of 50,000-60,000 mg / L and a TDS of 12,000-65,000 mg / L, including metal ions such as calcium, magnesium, manganese, and fluorine. Wastewater treatment is challenging, and direct discharge would cause severe damage and impact on the surrounding environment, hindering the development of the industry.

[0003] Currently, some traditional processes for treating ferric phosphate wastewater can increase the difficulty of subsequent treatment, leading to unnecessary treatment issues, high operating costs, high reagent consumption, and large sludge volumes. Furthermore, the introduction of calcium salts can cause blockage in the downstream membrane concentration and evaporation crystallization units, impacting system stability. Furthermore, the predominantly used pretreatment + multi-stage membrane concentration + MVR solution has high investment costs and cannot guarantee a consistent supply of high-salinity concentrated water to the evaporation system when the raw water salinity fluctuates. Utility Model Content

[0004] The utility model provides a single-stage membrane concentration device that can achieve high-fold concentration of ferric phosphate acidic wastewater, solving the problem in related technologies that traditional processes for treating ferric phosphate wastewater easily lead to difficulty and high cost in subsequent treatment.

[0005] The technical solution of the utility model is as follows:

[0006] A single-stage membrane concentration device capable of achieving high-fold concentration of ferric phosphate acid wastewater, comprising a raw water tank, a heat exchanger, a pretreatment micron filter, a single-stage membrane concentration device, a recycled water tank, and a concentrated water tank;

[0007] The raw water tank outlet is connected to the inlet pipeline of the heat exchanger, the raw water outlet of the heat exchanger is connected to the inlet pipeline of the pretreatment micron filter, the pretreatment micron filter outlet is connected to the inlet pipeline of the single-stage membrane concentration device, the concentrated water outlet of the single-stage membrane concentration device is connected to the raw water tank and the concentrated water tank pipeline respectively, and the recycled water pipeline of the single-stage membrane concentration device is connected to the recycled water tank.

[0008] Optionally, a booster pump and a high-pressure pump are further included, wherein the booster pump is arranged between the raw water tank and the heat exchanger, and the high-pressure pump is arranged between the pretreatment micron filter and the single-stage membrane concentration device.

[0009] Optionally, the raw water tank, the recycled water tank and the concentrated water tank are all provided with liquid level transmitters for monitoring the liquid levels of the raw water tank, the recycled water tank and the concentrated water tank.

[0010] Optionally, an automatic valve is provided at the inlet of the raw water tank, and the opening and closing of the automatic water inlet valve is controlled by the raw water tank liquid level transmitter.

[0011] Optionally, an online conductivity meter and a remote flow meter are respectively provided at the inlet and outlet of the raw water tank to monitor the conductivity and flow value of the ceramic production liquid entering the raw water tank, and to monitor the conductivity and flow value of the raw water after the ceramic production liquid is mixed with concentrated water.

[0012] Optionally, the inlet and outlet of the pre-treatment micron filter are provided with differential pressure transmitters, and on-site pressure gauges are provided at the inlet and outlet of the filter for monitoring the pressure difference between the inlet and outlet of the pre-treatment micron filter.

[0013] Optionally, the high-pressure pump is provided with a variable frequency starter, and the inlet and outlet of the high-pressure pump are both provided with pressure transmitters for monitoring the inlet and outlet pressures of the high-pressure pump. The outlet of the high-pressure pump is designed with an on-site pressure gauge and an automatic valve.

[0014] Optionally, the concentrated water outlet main pipe of the single-stage membrane concentrating device is provided with a pressure transmitter and an on-site pressure gauge for monitoring the concentrated water outlet pressure of the single-stage membrane concentrating device.

[0015] Optionally, the concentrated water outlet main pipe of the single-stage membrane concentration device is provided with an automatic regulating valve, a remote flow meter, an on-site flow meter and an online conductivity meter, and the automatic regulating valve is used to adjust the total flow rate and conductivity value of the concentrated water.

[0016] Optionally, the concentrated water outlet main pipeline of the single-stage membrane concentration device is divided into two branches, one concentrated water outlet main pipeline is connected to the raw water tank through a pipeline; the other concentrated water outlet main pipeline is connected to the concentrated water tank through a pipeline.

[0017] The working principle and beneficial effects of the utility model are as follows:

[0018] In this utility model, the raw water tank stores ferric phosphate acidic wastewater treated by the ceramic membrane system. Its outlet is connected via a pipeline to the inlet of a heat exchanger, which regulates the wastewater temperature. The raw water, after heat exchange, flows from the heat exchanger's raw water outlet and enters a pretreatment micron filter for preliminary filtration to remove larger particles. The filtered water then enters a single-stage membrane concentrator for concentration. The concentrated reuse water is then piped into the reuse water tank, while the concentrated water flows to the raw water tank and the concentrate tank, respectively, as needed.

[0019] The advantage is that through this connection method and the coordinated work of various components, continuous treatment of ferric phosphate acidic wastewater is achieved, and the raw water, heat exchange, filtration, concentration, and storage and distribution of recycled water and concentrated water are rationally arranged, which improves the efficiency and stability of the entire treatment process and lays the foundation for subsequent concentration and reuse operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0021] Figure 1 This is a schematic structural diagram of the utility model.

[0022] In the figure: 1. Raw water tank, 2. Booster pump, 3. Heat exchanger, 4. Pretreatment micron filter, 5. High-pressure pump, 6. Membrane concentration device, 7. Recycled water tank, 8. Concentrated water tank. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0024] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0025] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0026] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] Reference Figure 1 , which is the first embodiment of the utility model, proposes a single-stage membrane concentrating device that can achieve high-fold concentration of ferric phosphate acidic wastewater, including a raw water tank 1, a heat exchanger 3, a pretreatment micron filter 4, a single-stage membrane concentrating device 6, a recycled water tank 7, and a concentrated water tank 8; the outlet of the raw water tank 1 is connected to the inlet pipeline of the heat exchanger 3, the raw water outlet of the heat exchanger 3 is connected to the inlet pipeline of the pretreatment micron filter 4, the outlet of the pretreatment micron filter 4 is connected to the inlet pipeline of the single-stage membrane concentrating device 6, the concentrated water outlet of the single-stage membrane concentrating device 6 is connected to the raw water tank 1 and the concentrated water tank 8 pipelines respectively, and the recycled water pipeline of the single-stage membrane concentrating device 6 is connected to the recycled water tank 7.

[0028] In this embodiment, raw water tank 1 stores ferric phosphate acidic wastewater. Its outlet is connected via a pipeline to the inlet of heat exchanger 3, which regulates the wastewater temperature. After heat exchange, the raw water flows from the raw water outlet of heat exchanger 3 and enters pretreatment micron filter 4 for preliminary filtration to remove larger particulate impurities. The filtered water then enters single-stage membrane concentrator 6 for concentration. The concentrated recycled water flows through a pipeline into recycled water tank 7, while the concentrated water flows to raw water tank 1 and concentrated water tank 8, respectively, as needed.

[0029] The advantage is that through this connection method and the coordinated work of various components, continuous treatment of ferric phosphate acidic wastewater is achieved, and the raw water, heat exchange, filtration, concentration, and storage and distribution of recycled water and concentrated water are rationally arranged, which improves the efficiency and stability of the entire treatment process and lays the foundation for subsequent concentration and reuse operations.

[0030] Furthermore, it also includes a booster pump 2 and a high-pressure pump 5. The booster pump 2 is arranged between the raw water tank 1 and the heat exchanger 3, and the high-pressure pump 5 is arranged between the pretreatment micron filter 4 and the single-stage membrane concentration device 6.

[0031] In this embodiment, booster pump 2 is installed in the pipeline between raw water tank 1 and heat exchanger 3. It provides sufficient pressure for raw water to enter heat exchanger 3, ensuring smooth water flow. High-pressure pump 5 is located between pretreatment micron filter 4 and single-stage membrane concentrator 6. It delivers pretreated water to single-stage membrane concentrator 6 at high pressure, meeting the pressure requirements of the membrane concentration process.

[0032] The advantage is that booster pump 2 overcomes the flow resistance of raw water in the pipeline, ensuring that raw water can stably enter heat exchanger 3 for heat exchange treatment, avoiding water flow obstruction or interruption caused by insufficient pressure. High-pressure pump 5 provides the necessary high pressure conditions for single-stage membrane concentration device 6, improving the efficiency and effectiveness of membrane concentration and enabling more effective concentration and separation of wastewater.

[0033] Furthermore, the raw water tank 1 , the recycled water tank 7 and the concentrated water tank 8 are all provided with liquid level transmitters for monitoring the liquid levels of the raw water tank 1 , the recycled water tank 7 and the concentrated water tank 8 .

[0034] In this embodiment, liquid level transmitters are installed in the raw water tank 1, the recycled water tank 7, and the concentrated water tank 8. The liquid level transmitters use a specific measurement principle to detect the liquid level in the tanks in real time and convert the liquid level information into an electrical signal that is transmitted to the monitoring system or controller.

[0035] The benefit is that real-time monitoring of the liquid level in each tank allows operators to promptly understand the water level within the tank and adjust the device's operating parameters accordingly, preventing abnormal operation caused by overflow or empty tanks. This also helps achieve automated control and optimize the operation and management of the entire treatment system.

[0036] Furthermore, an automatic valve is provided at the inlet of the raw water tank 1, and the switch of the water inlet automatic valve is controlled by the liquid level transmitter of the raw water tank 1.

[0037] In this embodiment, an automatic valve is installed at the inlet of the raw water tank 1. This automatic valve is linked to the liquid level transmitter in the raw water tank 1 through a control circuit. When the liquid level transmitter detects that the liquid level in the raw water tank 1 has reached a set high or low level, it sends a signal to the control circuit, which then controls the opening and closing of the automatic valve.

[0038] The advantage is that automatic control of water inlet to the raw water tank 1 is achieved. When the liquid level in the water tank reaches the preset limit value, the automatic valve can respond in time to close or open the water inlet, avoiding the impact of excessively high or low liquid levels on the stable operation of the entire device, thereby improving the reliability and safety of the system and reducing the need for manual intervention.

[0039] Furthermore, an online conductivity meter and a remote flow meter are respectively provided at the inlet and outlet of the raw water tank 1 to monitor the conductivity and flow value of the ceramic production liquid entering the raw water tank 1, and to monitor the conductivity and flow value of the raw water after the ceramic production liquid is mixed with the concentrated water.

[0040] In this embodiment, an online conductivity meter and a remote flowmeter are installed at the inlet and outlet of the raw water tank 1. The online conductivity meter measures the conductivity of the ceramic production ferric phosphate acidic wastewater entering and leaving the raw water tank 1 in real time, reflecting changes in the ion concentration of the solution. The remote flowmeter, using a specific measurement principle, monitors the flow rate of the ceramic production liquid in real time and remotely transmits the flow data to a monitoring center or control system.

[0041] The benefit is that real-time conductivity monitoring can reveal changes in ion concentrations in wastewater, which is crucial for assessing chemical reactions and separation effectiveness during wastewater treatment. Remote flowmeters provide timely information on wastewater flow, facilitating adjustments to device operating parameters based on flow changes, ensuring a stable and efficient treatment process. They also provide data support for overall system optimization and troubleshooting.

[0042] Furthermore, the inlet and outlet of the pre-treatment micron filter 4 are provided with differential pressure transmitters, and local pressure gauges are provided at the inlet and outlet of the filter for monitoring the inlet and outlet pressure difference of the pre-treatment micron filter 4 .

[0043] In this embodiment, a differential pressure transmitter is installed at the inlet and outlet of the pre-treatment micron filter 4 to measure the pressure difference between the filter inlet and outlet. At the same time, an on-site pressure gauge is also installed at the filter inlet and outlet to directly display the pressure value of the inlet and outlet.

[0044] The advantage is that the differential pressure transmitter can monitor the pressure difference between the filter inlet and outlet in real time. When the pressure difference exceeds a certain threshold, it indicates that the filter may be clogged or the filtration efficiency has decreased, prompting the operator to clean or replace the filter element in a timely manner. The on-site pressure gauge provides on-site operators with intuitive pressure information, facilitating quick judgment of the filter's operating status, ensuring the stable operation of the pretreatment process, and extending the filter's service life.

[0045] Furthermore, the high-pressure pump 5 is provided with a variable frequency starter, and the inlet and outlet of the high-pressure pump 5 are both provided with pressure transmitters for monitoring the inlet and outlet pressures of the high-pressure pump 5. The outlet of the high-pressure pump 5 is designed with an on-site pressure gauge and an automatic valve.

[0046] In this embodiment, the high-pressure pump 5 is equipped with a variable frequency starter, which can adjust the motor speed according to actual needs, thereby varying the output pressure and flow rate of the high-pressure pump 5. Pressure transmitters are installed at the inlet and outlet of the high-pressure pump 5 to monitor pressure changes in real time. The outlet of the high-pressure pump 5 is also equipped with a local pressure gauge for on-site display of the outlet pressure and an automatic valve to adjust the outlet flow rate and pressure according to control signals.

[0047] The benefit lies in the variable frequency starter enabling high-pressure pump 5 to flexibly adjust its output parameters according to varying operating conditions, improving energy efficiency and device adaptability. The pressure transmitter provides real-time feedback on inlet and outlet pressures, helping to promptly detect pressure anomalies and ensuring the safe and stable operation of high-pressure pump 5. An on-site pressure gauge allows operators to intuitively understand outlet pressure, while the automatic valve provides a means for precise control of outlet flow and pressure, further optimizing overall system operation.

[0048] Furthermore, a pressure transmitter and an on-site pressure gauge are provided on the concentrated water outlet main pipe of the single-stage membrane concentrating device 6 to monitor the concentrated water outlet pressure of the single-stage membrane concentrating device 6 .

[0049] In this embodiment, a pressure transmitter and a local pressure gauge are installed on the concentrated water outlet main pipe of the single-stage membrane concentrator 6. The pressure transmitter converts the pressure signal into an electrical signal and transmits it to the control system, while the local pressure gauge directly displays the pressure value of the main pipe on site.

[0050] The advantage is that real-time monitoring of the concentrate outlet main pipe pressure is crucial for determining the operating status of the single-stage membrane concentrator 6 and the stability of the concentrate discharge. Dual monitoring using a pressure transmitter and an on-site pressure gauge allows for timely detection of abnormal pressure fluctuations, enabling appropriate adjustments to ensure smooth concentrate discharge and prevent pressure issues from causing unit failure or compromising the concentration process.

[0051] Furthermore, the concentrated water outlet main pipe of the single-stage membrane concentration device 6 is provided with an automatic regulating valve, a remote flow meter, an on-site flow meter and an online conductivity meter. The automatic regulating valve is used to adjust the total flow rate and conductivity value of the concentrated water.

[0052] In this embodiment, an automatic regulating valve, a remote flowmeter, an on-site flowmeter, and an online conductivity meter are installed on the concentrated water outlet main pipe of the single-stage membrane concentrator 6. The automatic regulating valve adjusts the flow rate and conductivity of the concentrated water based on control signals. The remote flowmeter and the on-site flowmeter monitor the flow rate of the concentrated water main pipe remotely and on-site in real time, respectively. The online conductivity meter measures the conductivity of the concentrated water in real time.

[0053] The advantage lies in the ability of the automatic regulating valve to precisely adjust the parameters of the concentrated water according to actual needs, meeting the processing requirements under different operating conditions. Dual monitoring by remote and local flow meters ensures the accuracy and reliability of flow data, providing operators with a comprehensive understanding of the concentrated water flow rate. The online conductivity meter provides real-time information on changes in ion concentration in the concentrated water, providing important guidance for evaluating the concentration effect and subsequent processing, thereby improving the automation and operational efficiency of the entire system.

[0054] Furthermore, the concentrated water outlet main pipeline of the single-stage membrane concentration device 6 is divided into two branches, one of which is connected to the raw water tank 1 through a pipeline; the other is connected to the concentrated water tank 8 through a pipeline.

[0055] In this embodiment, the concentrated water outlet main pipeline of the single-stage membrane concentrator 6 is divided into two branches. One branch is connected to the raw water tank 1 via a pipeline equipped with an automatic regulating valve, a remote flowmeter, and a local flowmeter. The flow rate of the concentrated water returning to the raw water tank 1 is controlled by adjusting the opening of the automatic regulating valve, and the flow rate is monitored by the remote flowmeter and the local flowmeter. The other branch is connected to the concentrated water tank 8 via a pipeline and is also equipped with an automatic regulating valve, a remote flowmeter, and a local flowmeter to regulate and monitor the flow rate of the concentrated water entering the concentrated water tank 8.

[0056] The advantage of this design is that it enables flexible distribution and precise control of concentrated water. As needed, some of the concentrated water can be returned to the raw water tank 1 for further processing or to adjust system operating parameters, while the remaining portion can be transferred to the concentrated water tank 8 for storage or subsequent processing. The combined use of the automatic regulating valve and flowmeter makes flow regulation and monitoring more accurate and reliable, improving the adaptability and stability of the entire system and meeting the concentrated water processing and utilization requirements under different operating conditions.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A single-stage membrane concentration device capable of achieving high-fold concentration of ferric phosphate acidic wastewater, characterized in that: It includes a raw water tank (1), a heat exchanger (3), a pre-treatment micron filter (4), a single-stage membrane concentration device (6), a recycled water tank (7), and a concentrated water tank (8); The outlet of the raw water tank (1) is connected to the inlet pipeline of the heat exchanger (3), the raw water outlet of the heat exchanger (3) is connected to the inlet pipeline of the pretreatment micron filter (4), the outlet of the pretreatment micron filter (4) is connected to the inlet pipeline of the single-stage membrane concentration device (6), the concentrated water outlet of the single-stage membrane concentration device (6) is respectively connected to the pipelines of the raw water tank (1) and the concentrated water tank (8), and the recycled water pipeline of the single-stage membrane concentration device (6) is connected to the recycled water tank (7).

2. A single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: It also includes a booster pump (2) and a high-pressure pump (5), wherein the booster pump (2) is arranged between the raw water tank (1) and the heat exchanger (3), and the high-pressure pump (5) is arranged between the pretreatment micron filter (4) and the single-stage membrane concentration device (6).

3. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: The raw water tank (1), the recycled water tank (7) and the concentrated water tank (8) are all provided with liquid level transmitters for monitoring the liquid levels of the raw water tank (1), the recycled water tank (7) and the concentrated water tank (8).

4. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: An automatic valve is provided at the inlet of the raw water tank (1), and the opening and closing of the water inlet automatic valve is controlled by a liquid level transmitter of the raw water tank (1).

5. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: An online conductivity meter and a remote flow meter are respectively provided at the inlet and outlet of the raw water tank (1) for monitoring the conductivity and flow value of the ceramic production liquid entering the raw water tank (1), and monitoring the conductivity and flow value of the raw water after the ceramic production liquid is mixed with the concentrated water.

6. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: The inlet and outlet of the pre-treatment micron filter (4) are provided with differential pressure transmitters, and local pressure gauges are provided at the inlet and outlet of the filter for monitoring the inlet and outlet pressure difference of the pre-treatment micron filter (4).

7. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 2, characterized in that: The high-pressure pump (5) is provided with a variable frequency starter, and the inlet and outlet of the high-pressure pump (5) are both provided with pressure transmitters for monitoring the inlet and outlet pressures of the high-pressure pump (5). The outlet of the high-pressure pump (5) is designed with an on-site pressure gauge and an automatic valve.

8. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: The concentrated water outlet main pipe of the single-stage membrane concentrating device (6) is provided with a pressure transmitter and an on-site pressure gauge for monitoring the concentrated water outlet pressure of the single-stage membrane concentrating device (6).

9. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: The concentrated water outlet main pipe of the single-stage membrane concentration device (6) is provided with an automatic regulating valve, a remote flow meter, an on-site flow meter and an online conductivity meter. The automatic regulating valve is used to adjust the total flow rate and conductivity value of the concentrated water.

10. The single-stage membrane concentrating device capable of achieving high-fold concentration of ferric phosphate acidic wastewater according to claim 1, characterized in that: The concentrated water outlet main pipeline of the single-stage membrane concentration device (6) is divided into two branches, one branch of concentrated water is connected to the raw water tank (1) through a pipeline; the other branch of concentrated water is connected to the concentrated water tank (8) through a pipeline.

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