A plate and frame filter press washing water recovery device

Abstract

The utility model provides a plate and frame filter press washing water recovery device, comprising a plate and frame filter press and a storage tank; one end of the plate and frame filter press is provided with a liquid inlet pipe and a liquid discharge pipe; the storage tank comprises a first storage tank, a second storage tank and a third storage tank; wherein the liquid discharge pipe is connected with the first storage tank, the second storage tank and the third storage tank respectively; the second storage tank and the third storage tank are also provided with a reflux pipe, and the reflux pipe is connected with the liquid inlet pipe; the washing water used each time is stored separately through a plurality of storage tanks, and a reflux pipe is added to the second storage tank and the third storage tank, so that the reflux pipe is connected with the liquid inlet pipe of the plate and frame filter press, so that the washing water after the second and third washing can re-enter the plate and frame filter press to wash solid materials, thereby the washing water for washing the solid materials can be reused, thereby effectively saving water resources.

Description

Technical Field

[0001] The utility model relates to the technical field of plate-frame filter presses, in particular to a washing water recovery device for a plate-frame filter press. Background Art

[0002] In the production process of lithium salts, the sulfuric acid production process is widely used. This process mainly transforms spodumene and then acidifies and roasts it with concentrated sulfuric acid, adds water to leach lithium sulfate, and then uses it to produce lithium carbonate / lithium hydroxide. Therefore, the leaching of acid clinker is the key to this process.

[0003] After leaching, the acid clinker is generally passed through a plate and frame filter press for solid-liquid separation to obtain a lithium sulfate solution. However, since some lithium is adsorbed in the solid material through adsorption, direct discharge will lead to loss of lithium resources. Therefore, water is needed to wash this part of the material. Usually three consecutive washings are required, and a large amount of water is consumed. If the washing water used for washing this part of the material is not effectively treated, it will cause a waste of water resources. Therefore, the problem of recycling the washing water of the plate and frame filter press needs to be effectively dealt with. Utility Model Content

[0004] The purpose of the utility model is to provide a plate and frame filter press washing water recovery device to solve the problem that the solid material obtained after the solid-liquid separation of the acid clinker proposed in the above background technology usually needs to be washed three times continuously, which will consume a large amount of water. If the washing water used for washing this part of the material is not effectively treated, it will cause a waste of water resources.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A plate-frame filter press washing water recovery device comprises a plate-frame filter press and a storage tank;

[0007] One end of the plate and frame filter press is provided with a liquid inlet pipe and a liquid outlet pipe;

[0008] The storage tanks include a first storage tank, a second storage tank and a third storage tank;

[0009] The liquid discharge pipe is connected to the first storage tank, the second storage tank and the third storage tank respectively; the second storage tank and the third storage tank are also provided with a reflux pipe, and the reflux pipe is connected to the liquid inlet pipe.

[0010] Preferably, the drainage pipe comprises:

[0011] a first liquid discharge pipe, connected to the first storage tank, and provided with a first switch valve;

[0012] a second liquid discharge pipe, connected to the second storage tank, and provided with a second switch valve;

[0013] The third liquid discharge pipe is connected to the third storage tank, and a third switch valve is arranged on the third liquid discharge pipe.

[0014] Preferably, a pressure reducing device is provided at the connection point between the first liquid discharge pipe and the first storage tank, and the first liquid discharge pipe is connected to the first storage tank through the pressure reducing device.

[0015] Preferably, a water pump is provided on the liquid inlet pipe.

[0016] Preferably, the reflux pipe comprises:

[0017] a first reflux pipe, connected to the second storage tank, wherein the first reflux pipe is provided with a fourth switch valve;

[0018] The second reflux pipe is connected to the third storage tank, and a fifth switch valve is provided on the second reflux pipe.

[0019] Preferably, there may be one or more plate and frame filter presses.

[0020] Preferably, each of the storage tanks is provided with an exhaust pipe.

[0021] Preferably, the upper portion of the exhaust pipe is arc-shaped.

[0022] Compared with the prior art, the beneficial effects of the utility model are as follows: multiple storage tanks are added to store the washing water used for each washing separately, and a reflux pipe is added to the storage tank containing the washing water used for the second and third washings, so that the reflux pipe is connected with the liquid inlet pipe of the plate and frame filter press, the liquid in the storage tank is made to flow to the liquid inlet pipe through a water pump, and the flow of the pipeline is controlled by a switch valve, so that the washing water used for the second and third washings can re-enter the plate and frame filter press to wash the solid materials, wherein the washing water used for the second washing can serve as the washing water for the first washing of the solid materials, and the washing water used for the third washing can serve as the washing water for the second washing of the solid materials, thereby the washing water for washing the solid materials can be reused, thereby effectively saving water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a plate-frame filter press according to an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of multiple plate-frame filter presses according to an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the first storage tank in an embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of the structure of the second storage tank in an embodiment of the utility model.

[0028] Figure numerals: 1. Plate and frame filter press; 2. Storage tank; 21. First storage tank; 22. Second storage tank; 23. Third storage tank; 3. Liquid inlet pipe; 4. Liquid discharge pipe; 41. First liquid discharge pipe; 411. First switch valve; 42. Second liquid discharge pipe; 421. Second switch valve; 43. Third liquid discharge pipe; 431. Third switch valve; 5. Reflux pipe; 51. First reflux pipe; 511. Fourth switch valve; 52. Second reflux pipe; 521. Fifth switch valve; 6. Pressure reducing structure; 61. Pressure reducing tank; 62. Quartz sand mixture; 7. Exhaust pipe; 8. Water pump. DETAILED DESCRIPTION

[0029] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships conventionally placed when the product of the present invention is used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0034] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 4 As shown, the embodiment of the utility model provides a plate-frame filter press washing water recovery device, comprising a plate-frame filter press 1 and a storage tank 2;

[0036] One end of the plate and frame filter press 1 is provided with a liquid inlet pipe 3 and a liquid outlet pipe 4;

[0037] The storage tank 2 includes a first storage tank 21, a second storage tank 22 and a third storage tank 23;

[0038] The liquid discharge pipe 4 is connected to the first storage tank 21 , the second storage tank 22 and the third storage tank 23 respectively; the second storage tank 22 and the third storage tank 23 are also provided with a reflux pipe 5 , and the reflux pipe 5 is connected to the liquid inlet pipe 3 .

[0039] The washing water used for each washing is stored separately through the first storage tank 21, the second storage tank 22 and the third storage tank 23, and a reflux pipe 5 is added to the second storage tank 22 and the third storage tank 23. The reflux pipe 5 is connected with the liquid inlet pipe 3 of the plate and frame filter press 1, so that the washing water used for the second and third washings can re-enter the plate and frame filter press 1 to wash the solid materials, wherein the washing water used for the second washing can serve as the washing water for the first washing of the solid materials, and the washing water used for the third washing can serve as the washing water for the second washing of the solid materials, thereby the washing water for washing the solid materials can be reused, thereby effectively saving water resources.

[0040] It should be noted that the washing water used for the first washing cannot be reused because a large amount of impurities have been accumulated in the washing water after multiple washings.

[0041] In order to control the flow direction of the liquid so that the washing water of each washing can flow into the corresponding storage tank 2, the drainage pipe 4 includes:

[0042] A first liquid discharge pipe 41 is connected to the first storage tank 21, and a first switch valve 411 is provided on the first liquid discharge pipe 41;

[0043] A second liquid discharge pipe 42 is connected to the second storage tank 22, and a second switch valve 421 is provided on the second liquid discharge pipe 42;

[0044] The third liquid discharge pipe 43 is connected to the third storage tank 23 , and a third switch valve 431 is disposed on the third liquid discharge pipe 43 .

[0045] When the washing water used for the first washing is discharged from the drain pipe 4, the first switch valve 411 is opened to allow the washing water to flow into the first storage tank 21 through the first drain pipe 41; when the washing water used for the second washing is discharged from the drain pipe 4, the second switch valve 421 is opened to allow the washing water to flow into the second storage tank 22 through the second drain pipe 42; when the washing water used for the third washing is discharged from the drain pipe 4, the third switch valve 431 is opened to allow the washing water to flow into the third storage tank 23 through the third drain pipe 43.

[0046] It should be noted that only the switch valve on the corresponding discharge pipe 4 is opened each time, and the switch valves on other pipes are all closed.

[0047] In addition, after the filter press completes the pressing and washing operations, the filter cake needs to be dried by compressed air to reduce the amount of lithium in the filter cake. Therefore, the wash water will carry compressed air, and a large amount of wash water mixed with pressurized air will be suddenly discharged into the storage tank 2, causing the internal pressure of the storage tank 2 to suddenly increase, causing an impact on the storage tank 2, causing it to vibrate, and even causing the wash water to splash out of the storage tank 2, affecting the environment around the storage tank 2. A decompression structure 6 is provided at the connection point between the first drain pipe 41 and the first storage tank 21. The first drain pipe 41 is connected to the first storage tank 21 through the decompression structure 6, and the decompression structure 6 plays a role in exhausting air, relieving pressure and slowing down the liquid flow rate.

[0048] Specifically, the decompression structure 6 includes a decompression groove 61 and a quartz sand mixture 62 , and the quartz sand mixture 62 is placed in the decompression groove 61 .

[0049] A decompression structure 6 is provided at the entrance of the first storage tank 21. When a large amount of liquid mixed with pressurized air is discharged from the first liquid discharge pipe 41, the liquid flows into the quartz sand mixture 62, and enters the first storage tank 21 after being buffered in the quartz sand mixture 62. The decompression tank 61 can temporarily store the washing water that has no time to flow into the first storage tank 21, thereby reducing the impact force on the first storage tank 21 caused by the sudden discharge of a large amount of liquid, thereby achieving the purpose of slowing down the rapid increase of the internal pressure of the tank body; in addition, when the pressure in the first storage tank 21 increases, since the quartz sand mixture 62 is air-permeable, the first storage tank 21 can be vented and depressurized through the quartz sand mixture 62, so that the gas in the tank body can be discharged in time, preventing the excessive pressure inside the first storage tank 21 from splashing out of the storage tank or affecting the discharge of washing water.

[0050] In order to pump out the liquid in the second storage tank 22 and the third storage tank 23 , a water pump 8 is provided on the liquid inlet pipe 3 .

[0051] Furthermore, the reflux pipe 5 comprises:

[0052] The first reflux pipe 51 is connected to the second storage tank 22 and is provided with a fourth switch valve 511;

[0053] The second reflux pipe 52 is communicated with the third storage tank 23 and is provided with a fifth switch valve 521 .

[0054] When the solid material needs to be washed for the first time, the fourth switch valve 511 is opened, and the pump 8 is started, so that the washing water used for the second washing enters the liquid inlet pipe 3 through the first reflux pipe 51, thereby re-entering the plate and frame filter press 1 to wash the solid material for the first time; when the solid material needs to be washed for the second time, the fifth switch valve 521 is opened, and the pump 8 is started, so that the washing water used for the third washing enters the liquid inlet pipe 3 through the second reflux pipe 52, thereby re-entering the plate and frame filter press 1 to wash the solid material for the second time.

[0055] It should be noted that the plate and frame filter press wash water recovery device is also provided with a controller, which is respectively connected to the first drain pipe 41, the second drain pipe 42, the third drain pipe 43, the fourth switch valve 511, the fifth switch valve 521 and the water pump 8 for controlling their opening and closing.

[0056] like Figure 1 As shown, the plate and frame filter press 1 can be one.

[0057] like Figure 2 As shown, there may be multiple plate and frame filter presses 1, and multiple plate and frame filter presses 1 may share a set of storage tanks 2, thereby meeting large-scale production needs while reducing equipment investment.

[0058] In order to prevent excessive pressure inside the tank body, an exhaust pipe 7 is provided on each storage tank 2, and the exhaust pipe 7 can be but is not limited to one.

[0059] Specifically, the upper portion of the exhaust pipe 7 is arc-shaped, which can effectively prevent liquid from splashing out of the exhaust pipe 7.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A plate and frame filter press washing water recovery device, characterized in that: It comprises a plate and frame filter press (1) and a storage tank (2); One end of the plate and frame filter press (1) is provided with a liquid inlet pipe (3) and a liquid outlet pipe (4); The storage tank (2) comprises a first storage tank (21), a second storage tank (22) and a third storage tank (23); The liquid discharge pipe (4) is connected to the first storage tank (21), the second storage tank (22) and the third storage tank (23) respectively; the second storage tank (22) and the third storage tank (23) are also provided with a return pipe (5), and the return pipe (5) is connected to the liquid inlet pipe (3).

2. The plate and frame filter press washing water recovery device according to claim 1, characterized in that: The liquid discharge pipe (4) comprises: A first liquid discharge pipe (41) connected to the first storage tank (21), wherein the first liquid discharge pipe (41) is provided with a first switch valve (411); A second liquid discharge pipe (42) connected to the second storage tank (22), wherein the second liquid discharge pipe (42) is provided with a second switch valve (421); The third liquid discharge pipe (43) is connected to the third storage tank (23), and a third switch valve (431) is provided on the third liquid discharge pipe (43).

3. The plate and frame filter press washing water recovery device according to claim 2, characterized in that: A decompression structure (6) is provided at the connection point between the first liquid discharge pipe (41) and the first storage tank (21); the first liquid discharge pipe (41) is connected to the first storage tank (21) via the decompression structure (6).

4. The plate and frame filter press washing water recovery device according to claim 1, characterized in that: The liquid inlet pipe (3) is provided with a water pump (8).

5. The plate and frame filter press washing water recovery device according to claim 1, characterized in that: The reflux pipe (5) comprises: A first reflux pipe (51) is connected to the second storage tank (22), and a fourth switch valve (511) is provided on the first reflux pipe (51); The second reflux pipe (52) is connected to the third storage tank (23), and a fifth switch valve (521) is provided on the second reflux pipe (52).

6. The plate and frame filter press washing water recovery device according to claim 1, characterized in that: The plate and frame filter press (1) may be one or more.

7. The plate and frame filter press washing water recovery device according to claim 1, characterized in that: The storage tanks (2) are each provided with an exhaust pipe (7).

8. The plate and frame filter press washing water recovery device according to claim 7, characterized in that: The top of the exhaust pipe (7) is arc-shaped.

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