A pretreatment self-cleaning filter system for lithium extraction from salt lakes

Abstract

The utility model discloses a kind of pretreatment self-cleaning filtration systems for salt lake lithium extraction, it is related to salt field water treatment technical field, and it include: filter device, feeding device, online thick slurry discharge device, offline thick slurry discharge device, back flushing device, backwashing device, discharging device;Filter device includes filter, and the filter includes cylinder and the top cover of setting at cylinder top, filter core fixing plate is set between cylinder and top cover, and mounting port for being installed with filter core is opened on filter core fixing plate;Top cover is provided with filtered liquid outlet, back flushing and backwashing;Cylinder is provided with raw water inlet, thick slurry discharge port and vent port;Through the setting of self-cleaning filtration system, old brine / brine / tail brine can be entered into filter cylinder by feeding system, flow from outside to inside by filter core, after being treated, filtered water is entered into above filter core fixing plate of filter, is discharged by filtered liquid outlet, and the filtration of brine is completed again.

Description

Technical Field

[0001] This utility model specifically relates to the field of salt field water treatment technology, and more specifically to a pretreatment self-cleaning filtration system for lithium extraction from salt lakes. Background Technology

[0002] With changes in ambient temperature and weather, the suspended solids (SS) value of brine (mainly old brine from salt fields) fluctuates significantly. Due to the geographical location of salt fields, the SS value of brine can be affected by weather changes by up to 500 mg / L. The SS value has a significant impact on the adsorption effect and lifespan of lithium-ion adsorbents, mainly for the following two reasons:

[0003] Adsorption efficiency: Suspended solids and petroleum impurities can cover the surface of the adsorbent, hindering the effective adsorption of lithium ions and reducing the adsorption efficiency; specifically, the saturated adsorption capacity of the adsorbent is reduced. For example, the saturated adsorption capacities of aluminum-based, titanium-based, and manganese-based adsorbents are 7.9 mg / g, 12.5 mg / g, and 15.3 mg / g, respectively.

[0004] Adsorbent lifespan: Suspended solids and petroleum impurities can also increase the solubility rate of adsorbents, affecting their long-term service life. For example, the solubility rates of titanium-based and manganese-based adsorbents are 20 times and 70 times that of aluminum-based adsorbents, respectively, and their service life under long-term operation is significantly lower than that of aluminum-based adsorbents. Utility Model Content

[0005] The purpose of this invention is to provide a pretreatment self-cleaning filtration system for lithium extraction from salt lakes. In this device, raw water enters the cylinder through the raw water inlet. Through the filtration action of the filter element from the inside out, the filtered water enters above the filter element fixing plate and is discharged through the filtrate outlet. The filtrate is then transported to the next process flow through the discharge pipe, completing the filtration of the raw water. During filtration, according to a time setting, the concentrated slurry discharge port is opened periodically to discharge some of the concentrated slurry from the cylinder. After discharge, the concentrated slurry discharge port is closed. During filtration, based on the pressure difference between the feed pressure sensor and the discharge pressure sensor, filtration stops when the set value is reached. Compressed air is supplied through the backflush port and enters the filter through the top cover. The backflush air blows the filter element from the inside out, while the concentrated slurry discharge port is opened simultaneously for offline concentrated slurry discharge. By repeatedly completing the above process, the suspended solids (SS) index of the brine entering the adsorption system is effectively reduced, reducing the cost of manual cleaning and replacement of the adsorbent, and improving the adsorption efficiency; thus solving the problems mentioned in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pretreatment self-cleaning filtration system for lithium extraction from salt lakes includes: a filtration device, a feeding device, an online thick slurry discharge device, an offline thick slurry discharge device, a backflushing device, a backwashing device, and a discharge device.

[0008] The filtration device includes a filter, which comprises a cylinder and a top cover disposed on the top of the cylinder. A filter element fixing plate is disposed between the cylinder and the top cover, and the filter element fixing plate has an installation port for easy installation of the filter element. The top cover is provided with a filtrate outlet, a backflush port, and a backwash port. The filtrate outlet, backflush port, and backwash port are arranged in a through manner. The cylinder is provided with a raw water inlet, a concentrated slurry discharge port, and a vent port.

[0009] As a further technical solution of this utility model, the online slurry discharge device includes a slurry collection device and a slurry pump; it can discharge slurry from the filter without stopping the machine, which can reduce the frequency of backwash water and backflush air, reduce the amount of backwash water and backflush air used, and the system does not require chemical cleaning, does not introduce new chemical elements into the system, and does not use hazardous chemicals.

[0010] The offline slurry discharge device has the same structure as the online slurry discharge device; it can completely discharge all the slurry inside the filter.

[0011] As a further technical solution of this utility model, the feeding device includes a feeding pump, a feeding pipeline, a feeding pressure sensor, and a feeding turbidity detector; it can monitor the raw water feeding pressure and raw water turbidity.

[0012] As a further technical solution of this utility model, the backflushing device includes a backflushing process air tank, a pressure reducing valve, and a safety valve; it can use compressed air to blow the filter element from the inside out to restore the filter element's initial filtration effect.

[0013] The backwashing device includes a backwash water storage device and a backwash pump; it can use unsaturated brine or fresh water to clean the filter element from the inside out, restoring the filter element's initial filtration effect.

[0014] The discharge device includes a discharge pipe, a discharge pressure sensor, and a flow meter; it can monitor the discharge pressure of the filtered water, the turbidity of the filtered water, and the system processing flow rate.

[0015] As a further technical solution of this utility model, the feed pump is connected to the raw water inlet through a connecting pipe, and a static mixer, a feed pressure sensor and a feed turbidity detector are installed on the connecting pipe.

[0016] As a further technical solution of this utility model, the discharge pipe of the discharge device is connected to the outlet of the filter liquid, and the outlet of the filter liquid is equipped with a discharge pressure sensor and a discharge pressure detector.

[0017] As a further technical solution of this utility model, a cylinder sight glass and an inspection port are also provided on one side of the bottom of the cylinder; the inspection port facilitates personnel to enter for inspection and maintenance, and the sight glass facilitates personnel to observe the internal condition of the cylinder; the bottom of the cylinder is conical or elliptical, which is conducive to the automatic settling and accumulation of the slurry.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This utility model, through the setting of a self-cleaning filtration system, allows old brine / raw brine / tail brine to enter the filter cylinder through the feeding system, flowing from the outside of the filter element to the inside. Through the filtration effect of the filter element, the treated filtered water enters the filter element fixing plate above the filter element and is discharged through the filtered liquid outlet, thus completing the filtration of brine. Through the setting of the feeding device / discharging device, the quality and pressure of raw water / filtered water can be monitored remotely and locally without human supervision.

[0020] This invention, through the setting of the back-blowing device, uses compressed air to blow from the inside to the outside of the filter element, which can clean the impurities inside and outside the filter element, restore the filter element's initial effect, and extend its service life. Through the setting of the backwashing device, uses unsaturated brine / fresh water to rinse from the inside to the outside of the filter element, which can clean the impurities inside and outside the filter element, dissolve the crystallized salt inside and outside the filter element, restore the filter element's initial effect, and extend its service life.

[0021] This utility model has a static mixer installed on the slurry inlet pipe, and the other inlet of the dynamic mixer is connected to heated water. By setting the static mixer, the viscosity of brine and the risk of salt formation can be reduced, and the brine temperature can be increased, which is conducive to the stable operation of the filter in low temperature environment. It is made of ultra-high molecular weight polyethylene powder and is designed with material modification for salt lake brine, which can be used in low temperature working conditions of salt lake brine in various places.

[0022] In this utility model, in an online / offline concentrated slurry removal system, the concentrated slurry inside the filter cartridge is discharged to restore the initial operating conditions of the filtration system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pretreatment self-cleaning filtration system in this utility model.

[0024] Figure 2 This utility model Figure 1 Schematic diagram of the middle filtration device.

[0025] In the diagram: 1-Cylinder, 2-Backflush process gas tank, 3-Pressure reducing valve, 4-Safety valve, 5-Backwash water storage device, 6-Backwash pump, 7-Feed pump, 8-Static mixer, 9-Feed pressure sensor, 10-Feed turbidity detector, 11-Discharge pressure sensor, 12-Discharge pressure detector, 13-Slurry collection device, 14-Slurry pump, 15-Top cover, 16-Filter element fixing plate, 17-Vent port, 18-Filtrate outlet, 19-Backflush port, 20-Backwash port, 21-Filter element, 22-Raw water inlet, 23-Slurry discharge port, 24-Cylinder sight glass, 25-Inspection port. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-2 In this embodiment of the present invention, a pretreatment self-cleaning filtration system for lithium extraction from salt lakes includes: a filtration device, a feeding device, an online slurry discharge device, an offline slurry discharge device, a backflushing device, a backwashing device, and a discharge device.

[0028] The filtration device includes a filter, which comprises a cylinder 1 and a top cover 15 disposed on the top of the cylinder 1. A filter element fixing plate 16 is disposed between the cylinder 1 and the top cover 15. The filter element fixing plate 16 has an installation port for installing the filter element 21. The top cover 15 is provided with a filtrate outlet 18, a backflush port 19, and a backwash port 20. The filtrate outlet 18, the backflush port 19, and the backwash port 20 are arranged in a continuous manner. The cylinder 1 is provided with a raw water inlet 22, a concentrated slurry outlet 23, and a vent port 17. The filter element fixing plate 16 has multiple installation ports, and the tops of multiple filter elements 21 are respectively installed on each installation port. The installation ports facilitate the installation and connection of the filter element 21 and the filter by means of nuts, etc.

[0029] By adopting the above technical solution and setting up a self-cleaning filtration system, the old brine / raw brine / tail brine can enter the filter cylinder 1 through the feeding system and flow from the outside of the filter element 21 to the inside. Through the filtration effect of the filter element 21, the treated filtered water enters above the filter element fixing plate 16 and is discharged through the filtered liquid outlet, thus completing the filtration of brine. With the setting of the feeding device / discharging device, the quality and pressure of the raw water / filtered water can be monitored remotely and locally without human supervision. The replacement cycle and performance guarantee of the filter element are controlled by the feeding turbidity detector 10 and the discharging pressure detector 12.

[0030] In this embodiment, the online slurry discharge device includes a slurry collection device 13 and a slurry pump 14;

[0031] The offline thickening slurry discharge device and the online thickening slurry discharge device have the same structural configuration;

[0032] In this embodiment, the feeding device includes a feeding pump 7, a feeding pipe, a feeding pressure sensor 9, and a feeding turbidity detector 10;

[0033] The backflush device includes a backflush process gas tank 2, a pressure reducing valve 3, and a safety valve 4;

[0034] The backwashing device includes a backwash water storage device 5 and a backwash pump 6; the backwash water storage device 5 and the backwash pump 6 are connected to the filter backwash port 20 through a backwash pipe;

[0035] The start-up of the backwashing device and the backflushing device is controlled by the pressure difference set value between the feed pressure sensor 9 and the discharge pressure sensor 11.

[0036] The discharge device includes a discharge pipe, a discharge pressure sensor 11, and a flow meter;

[0037] By adopting the above technical solution, and by setting up a backflushing device, compressed air is used to blow from the inside to the outside of the filter element 21, which can clean the impurities inside and outside the filter element 21, restore the initial effect of the filter element, and extend the service life of the filter element. By setting up a backwashing device, unsaturated brine / fresh water is used to rinse from the inside to the outside of the filter element, which can clean the impurities inside and outside the filter element 21, dissolve the crystallized salt inside and outside the filter element 21, restore the initial effect of the filter element 21, and extend the service life of the filter element 21.

[0038] Furthermore, the feed pump 7 is connected to the raw water inlet 22 via a connecting pipe, and a static mixer 8, a feed pressure sensor 9, and a feed turbidity detector 10 are installed on the connecting pipe.

[0039] In this embodiment, the discharge pipe of the discharge device is connected to the filter outlet 18, and the filter outlet 18 is equipped with a discharge pressure sensor 11 and a discharge pressure detector 12.

[0040] The bottom side of the cylinder 1 is also provided with a cylinder sight glass 24 and an inspection port 25; this facilitates personnel access for inspection and maintenance, and the sight glass 24 allows personnel to observe the internal condition of the cylinder 1.

[0041] By adopting the above technical solution, a static mixer 8 is installed on the slurry inlet pipe, and the other inlet of the dynamic mixer is connected to the heating water. By setting the static mixer 8, the viscosity of the brine and the risk of salt formation can be reduced, and the brine temperature can be increased, which is conducive to the stable operation of the filter in low temperature environment. It is made of ultra-high molecular weight polyethylene powder and is designed with material modification for salt lake brine, which can be used in low temperature working conditions of salt lake brine in various places.

[0042] The concentrated slurry inside the filter housing 1 is discharged through the online / offline concentrated slurry removal system, restoring the initial operating conditions of the filtration system.

[0043] The working principle of this utility model is as follows: The entire process of this structure is basically divided into: filtration process, online concentration removal process, backflushing process, offline concentration removal process, and backwashing process;

[0044] Raw water enters the cylinder 1 through the raw water inlet 22 and is filtered from the inside out by the filter element 21. The filtered water then enters above the filter element fixing plate 16 and is discharged through the filtrate outlet 18. The filtrate is then transported to the next process flow through the discharge pipe, completing the raw water filtration. During filtration, the thick slurry discharge port 23 is opened periodically according to a time setting to discharge some of the thick slurry inside the cylinder 1. After discharge, the thick slurry discharge port 23 is closed. During filtration, the pressure difference between the feed pressure sensor 9 and the discharge pressure sensor 11 is set. When the set value is reached, filtration stops, and compressed air is supplied through the backflush port 19. The compressed air is discharged from the top cover 15. When the filter is entered, backflushing air blows the filter element from the inside out. At the same time, the thick slurry discharge port 23 is opened for offline thick slurry discharge. After completion, the equipment is reset and the filtration process is repeated. After the filtration process is restarted several times, the initial pressure difference setting of the feed pressure sensor 9 and the discharge pressure sensor 11 reaches the set value. Then, after the current filtration process is completed, the backwash process is performed. Backwash water is delivered through the backwash port 20 and enters the filter through the top cover 15. The backwash water washes the filter element from the inside out. At the same time, the vent port 17 is opened for exhaust. After the backwash is completed, the backwash wastewater in the cylinder 1 is discharged from the filter through the thick slurry discharge port 23. After completion, the equipment is reset and the filtration process is repeated.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pretreatment self-cleaning filtration system for lithium extraction from salt lakes, characterized in that: include: Filtration device, feeding device, online thick slurry discharge device, offline thick slurry discharge device, backflushing device, backwashing device, discharge device; The filtration device includes a filter, which includes a cylinder (1) and a top cover (15) on the top of the cylinder (1). A filter element fixing plate (16) is provided between the cylinder (1) and the top cover (15). The filter element fixing plate (16) has an installation port for installing the filter element (21). The top cover (15) is provided with a filtrate outlet (18), a backflush port (19), and a backwash port (20). The filtrate outlet (18), the backflush port (19), and the backwash port (20) are arranged in a continuous manner. The cylinder (1) is provided with a raw water inlet (22), a concentrated slurry outlet (23), and a vent (17).

2. The pretreatment self-cleaning filtration system for lithium extraction from salt lakes according to claim 1, characterized in that: The online slurry discharge device includes a slurry collection device (13) and a slurry pump (14). The offline thickening slurry discharge device has the same structural configuration as the online thickening slurry discharge device.

3. The pretreatment self-cleaning filtration system for lithium extraction from salt lakes according to claim 1, characterized in that: The feeding device includes a feed pump (7), a feed pipe, a feed pressure sensor (9), and a feed turbidity detector (10).

4. The pretreatment self-cleaning filtration system for lithium extraction from salt lakes according to claim 1, characterized in that: The backflush device includes a backflush process gas tank (2), a pressure reducing valve (3), and a safety valve (4); The backwashing device includes a backwash water storage device (5) and a backwash pump (6). The discharge device includes a discharge pipe, a discharge pressure sensor (11), and a flow meter.

5. A pretreatment self-cleaning filtration system for lithium extraction from salt lakes according to claim 3, characterized in that: The feed pump (7) is connected to the raw water inlet (22) via a connecting pipe. A static mixer (8), a feed pressure sensor (9), and a feed turbidity detector (10) are installed on the connecting pipe.

6. A pretreatment self-cleaning filtration system for lithium extraction from salt lakes according to claim 5, characterized in that: The discharge pipe of the discharge device is connected to the filter outlet (18), and the filter outlet (18) is equipped with a discharge pressure sensor (11) and a discharge pressure detector (12).

7. A pretreatment self-cleaning filtration system for lithium extraction from salt lakes according to claim 1, characterized in that: The bottom side of the cylinder (1) is also provided with a cylinder sight glass (24) and an inspection port (25).

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