Waste salt cleaning equipment and cleaning method

Abstract

The invention relates to the technical field of industrial salt treatment, in particular to waste salt cleaning equipment and method. The waste salt cleaning equipment comprises a cleaning tank, a feeder and a spraying device; the feeder is configured to be capable of conveying waste salt and saturated salt water in the cleaning tank from the inlet end to the outlet end and enabling the waste salt to roll over in the conveying process, and the saturated salt water sprayed by the saturated salt water nozzle can wash the waste salt in the rolling-over process; the waste salt cleaning device has the advantages that waste salt is continuously turned and rubbed through rotation and stirring effects generated in the conveying process of the feeder, the surfaces of salt particles can be deeply cleaned in combination with uniform spraying formed by the saturated salt water nozzles, soluble impurities contained in the salt particles and attached insoluble substances are effectively removed, and therefore cleaning thoroughness and consistency are remarkably improved.

Description

Waste salt cleaning equipment and cleaning methods Technical Field

[0001] This invention relates to the technical field of industrial salt treatment, and more particularly to a waste salt cleaning device and cleaning method. Background Technology

[0002] Industrial production generates large quantities of complex waste salts, which often contain various insoluble impurities. Therefore, effective cleaning and purification of waste salts is a crucial pretreatment step for their resource utilization or harmless disposal.

[0003] Currently, domestic industrial waste salt treatment equipment typically uses agitated salt washing machines for washing and purifying industrial waste salt. Through the agitation of the blades, the washing liquid causes strong collisions, scouring, and mixing of the salt particles, forming a reverse washing process that separates dirt from the particle surface, thus achieving the washing purpose.

[0004] However, simple soaking or stirring cleaning often results in uneven cleaning, many dead corners, and limited effectiveness in removing strongly attached impurities, leading to low cleaning efficiency and unstable results. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a waste salt cleaning equipment and cleaning method, which solves the technical problem of limited impurity removal effect of the existing waste salt cleaning equipment.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, the present invention provides a waste salt cleaning device, including a cleaning tank, a feeder, and a spraying device; the outlet end of the feeder is inclined upward, the cleaning tank is located at the inlet end and is suitable for containing waste salt and saturated brine; the spraying device includes several sets of saturated brine nozzles distributed along the extension direction of the feeder, the saturated brine nozzles being suitable for outputting saturated brine into the feeder; wherein, the feeder is configured to convey the waste salt and saturated brine in the cleaning tank from the inlet end to the outlet end, and to cause the waste salt to tumble during the conveying process, and the saturated brine sprayed by the saturated brine nozzles can rinse the tumbling waste salt.

[0010] In one technical solution of the present invention, an ultrasonic transducer is also included, which is disposed on the cleaning tank and is suitable for generating high-frequency sound waves and causing the saturated brine and / or waste salt to vibrate through cavitation effect.

[0011] In one embodiment of the present invention, an ultrasonic transducer is disposed on the bottom wall and / or side wall of the cleaning tank.

[0012] In one embodiment of the present invention, a jet nozzle is provided at the outlet end to output a mixture of waste salt and saturated brine.

[0013] In one embodiment of the present invention, the feeder is a twin-screw feeder comprising two parallel screws, wherein the two screws rotate in opposite directions.

[0014] In one embodiment of the present invention, both screws rotate inward relative to the axis of the feeder.

[0015] In one embodiment of the present invention, the spraying device further includes a pure water nozzle, which is located downstream of the saturated brine nozzle; the pure water nozzle is capable of outputting pure water to replenish the saturated brine with water while cleaning the waste salt.

[0016] In one embodiment of the present invention, a solid-liquid separation device is also included, located downstream of the feeder, to receive and separate the waste salt and saturated brine output from the feeder.

[0017] In one technical solution of the present invention, a water circulation system is also included, wherein the inlet of the water circulation system is connected to the saturated brine outlet of the solid-liquid separation device, and the outlet of the water circulation system is connected to the saturated brine nozzle.

[0018] Secondly, the present invention provides a waste salt cleaning method, applied to the waste salt cleaning equipment in the above-mentioned technical solution, the method comprising:

[0019] S1: Inject saturated brine into the cleaning tank;

[0020] S2: Start the ultrasonic transducer and feeder;

[0021] S3: Inject waste salt into the cleaning tank;

[0022] S4: Start the spray system to flush the waste salt being transported by the feeder.

[0023] (III) Beneficial Effects

[0024] The beneficial effects of this invention are as follows: In the operation of the waste salt washing equipment of this invention, the feeder transports waste salt and saturated brine from the inlet to the outlet of the washing tank. During this transport, saturated brine nozzles can spray saturated brine onto the waste salt to rinse and clean it. The cleaned waste salt and saturated brine are then discharged from the outlet.

[0025] The rotation and stirring action generated by the feeder during the conveying process continuously agitates and rubs the waste salt. Combined with the uniform spray formed by the saturated brine nozzle, it can deeply clean the surface of the salt particles, effectively removing soluble impurities and attached insoluble substances, thereby significantly improving the thoroughness and consistency of the cleaning.

[0026] The equipment features a compact structure and rational layout, facilitating transportation and on-site installation while simplifying daily operation and maintenance. The cleaning process can be automated through a programmed control system, helping to ensure long-term, continuous, and stable operation, and reducing maintenance frequency and operating costs. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the main structure of the waste salt cleaning equipment of the present invention;

[0028] Figure 2 is a top view of the waste salt washing equipment of the present invention.

[0029] Figure 3 is a schematic diagram of the right cross-sectional structure of the waste salt washing equipment of the present invention;

[0030] Figure 4 is a partially enlarged structural diagram of point A in Figure 1 of this invention;

[0031] Figure 5 is a partially enlarged structural diagram of point B in Figure 1 of the present invention;

[0032] Figure 6 is a schematic diagram of the waste salt treatment system of the present invention;

[0033] Figure 7 is a diagram of the saturated brine circulation of the water circulation system of the present invention.

[0034] Explanation of reference numerals in the attached figures

[0035] 1: Cleaning tank;

[0036] 2: Feeder; 201, Outlet end; 202, Inlet end; 21, Screw;

[0037] 3: Spraying device; 31: Saturated brine nozzle; 32: Pure water nozzle;

[0038] 4: Jet nozzle;

[0039] 6. Solid-liquid separation device;

[0040] 8. Ultrasonic transducer;

[0041] 40. Water circulation system. Detailed Implementation

[0042] To better explain and facilitate understanding of the present invention, the invention will be described in detail below with reference to Figures 1-7 through specific embodiments. In this document, directional terms such as "upper" and "lower" refer to the orientation in Figure 1. "Inner" refers to the direction perpendicular to the axis of the feeder 2 in Figure 2, and "outer" refers to the direction perpendicular to and away from the axis of the feeder 2 in Figure 2.

[0043] Example 1:

[0044] Referring to Figures 1-7, an embodiment of the present invention provides a waste salt washing device, including a washing tank 1, a feeder 2, and a spraying device 3;

[0045] One end of the feeder 2 is inclined upward as the outlet end 201, and the other end is the inlet end 202. The cleaning tank 1 is located at the inlet end 202 and is suitable for containing waste salt and saturated brine.

[0046] The spraying device 3 includes several sets of saturated brine nozzles 31 distributed along the extension direction of the feeder 2. The saturated brine nozzles 31 are adapted to output saturated brine into the feeder 2.

[0047] The feeder 2 is configured to convey waste salt and saturated brine from the inlet end 202 to the outlet end 201 in the washing tank 1, and to tumble the waste salt during the conveying process; the saturated brine sprayed by the saturated brine nozzle 31 can rinse the tumbling waste salt; the cleaned waste salt and saturated brine can be output from the outlet end 201.

[0048] In this embodiment, the feeder 2 is arranged at an angle, with its lower end being the inlet end 202 and its higher end being the outlet end 201. The cleaning tank 1 is located below the inlet end 202 and is used to contain the waste salt to be treated and the saturated brine. The spraying device 3 is equipped with multiple saturated brine nozzles 31, which are distributed along the extension direction of the feeder 2 and are capable of spraying saturated brine into the feeder 2.

[0049] During operation, the feeder 2 transports waste salt and saturated brine from the washing tank 1 from the inlet 202 to the outlet 201. During this transport, the saturated brine nozzle 31 sprays saturated brine onto the waste salt, rinsing and cleaning it. After use, some of the saturated brine naturally flows back into the washing tank 1 under gravity, achieving a certain degree of liquid recycling. The cleaned waste salt and the remaining saturated brine are ultimately discharged from the outlet 201.

[0050] The waste salt is constantly turned over and rubbed by the rotation and stirring action generated by the feeder 2 during the conveying process. Combined with the uniform spray formed by the saturated brine nozzle 31, it can deeply clean the surface of the salt particles, effectively removing the soluble impurities and insoluble substances contained therein, thereby significantly improving the thoroughness and consistency of cleaning.

[0051] The equipment features a compact structure and rational layout, facilitating transportation and on-site installation while simplifying daily operation and maintenance. The cleaning process can be automated through a programmed control system, helping to ensure long-term, continuous, and stable operation, and reducing maintenance frequency and operating costs.

[0052] Each set of saturated brine nozzles 31 may include multiple saturated brine nozzles 31 or one saturated brine nozzle 31. The saturated brine nozzle 31 may be set at an angle, such as at an acute angle to the downstream of the feeding direction of the feeder 2. In this way, after the saturated brine nozzle 31 outputs saturated brine, it can further tumble the waste salt and increase the speed of the output saturated brine relative to the waste salt, thereby improving the cleaning effect.

[0053] The washing tank 1 can be configured as an integral structure with the feeder 2, with the side wall of the washing tank 1 being the side wall of the feeder 2 inlet end 202, thereby improving the overall integrity of the waste salt washing equipment. Furthermore, the lowest point of the feeder 2 inlet end 202 can be considered the bottom of the washing tank 1, facilitating material feeding.

[0054] Meanwhile, the cleaning tank 1 extends along the length of the feeder 2, and the material inlet at the inlet end 202 also extends along the length of the feeder 2 to increase the feeding length. Thus, during the feeding process, the feeder 2 can improve the initial cleaning effect of the waste salt through its own agitation of the saturated brine and waste salt. After secondary cleaning by the saturated brine nozzle 31, the waste salt can achieve a better level of cleanliness.

[0055] The tilt angle of the feeder 2 can be 15°. By limiting the tilt angle of the feeder 2, the actual requirements of feeding efficiency and cleaning effect can be balanced. By limiting the tilt angle to 15°, the actual requirements of feeding efficiency and cleaning effect can be further balanced and optimized. Furthermore, the saturated brine nozzles 31 can be configured in three groups to achieve three-stage spraying of waste salt, thereby improving the cleaning effect of waste salt.

[0056] Example 2:

[0057] Referring to Figures 1-7, in addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0058] It also includes a jet nozzle 4 located at the outlet end 201 to output a mixture of waste salt and saturated brine. The jet nozzle 4 can be a flared mouth with the smaller end facing outward, so that the mixture of waste salt and saturated brine can enter the subsequent treatment process more efficiently.

[0059] By using a tapered flow channel design to guide and accelerate the discharged mixture, it enters the subsequent dehydration, drying, or further processing stages in a more concentrated and stable state. This not only helps reduce the escape and residue of the mixture in the transition stage, but also improves the connection efficiency between the entire cleaning system and subsequent processes, further enhancing the continuity of the production process and the overall processing efficiency.

[0060] Example 3:

[0061] Referring to Figures 1-7, in addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0062] The feeder 2 is a twin-screw feeder comprising two parallel screws 21 with opposite rotation directions. Both screws 21 rotate inward relative to the axis of the feeder 2. The twin-screw feeder can more thoroughly agitate and compress the waste salt during the feeding process. This is beneficial for the waste salt to be fully agitated and compressed in the washing tank 1, and also for it to be fully agitated and compressed in the feeder 2. The agitation process allows the saturated brine to contact the waste salt more fully, while the compression process allows the waste salt to remove surface impurities through friction, thereby improving the cleaning effect of the waste salt.

[0063] Specifically, compared to a single screw 21 or a simple conveying method, this design significantly enhances the intensity and uniformity of mixing and the transport volume of waste salt. During conveying, the waste salt is not only pushed forward but also subjected to squeezing, kneading, and shearing actions generated between the screws 21 and between the screws 21 and the cylinder wall. This continuous mechanical action effectively breaks up the waste salt clumps and promotes relative movement and friction between salt particles and between salt particles and saturated brine. On the one hand, this greatly increases the contact area and renewal frequency between the waste salt and saturated brine, allowing the saturated brine to more fully penetrate and flush every crevice and pit on the surface of the salt particles, thereby efficiently dissolving and removing soluble impurities. On the other hand, during the squeezing and mutual friction process, stubborn insoluble substances adhering to the surface of the salt particles are more easily peeled off and removed. Therefore, this twin-screw feeder not only performs the conveying function but also constitutes a continuous and efficient dynamic cleaning and pretreatment unit, improving the cleaning effect of the waste salt.

[0064] More specifically, one end of the two screws 21 can be linked by gear meshing to make their angular velocities equal, resulting in a more stable and balanced feeding process. Furthermore, the spiral blades of the two screws are interlaced to enhance the compression effect on the waste salt, thereby improving the cleaning effect. The spiral blades should be treated with a wear-resistant coating to extend their service life.

[0065] Furthermore, a saturated brine outlet can be provided on the screw 21. For example, the screw 21 can be made into a hollow structure so that the saturated brine can flow along the hollow screw 21 to the saturated brine outlet on it. Then, during the feeding process, the saturated brine is output through the screw 21 itself, which, together with the spraying effect of the saturated brine nozzle 31, can further improve the waste salt cleaning effect.

[0066] Example 4:

[0067] Referring to Figures 1-7, in addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0068] It also includes an ultrasonic transducer 8, which is mounted on the cleaning tank 1 and is suitable for generating high-frequency sound waves. Through the cavitation effect, it vibrates the saturated brine and / or waste salt. The cavitation effect forms tiny bubbles that burst instantly, generating a powerful impact force that can penetrate deep into the tiny gaps and blind holes of the salt particles, thoroughly removing organic matter, grease, and impurities adhering to the surface.

[0069] By incorporating an ultrasonic transducer 8, the waste salt cleaning process is no longer limited to macroscopic flow and mechanical friction. The powerful impact force generated by ultrasonic cavitation can penetrate to the microscopic cracks, deep pores, and interior layers of the salt particles, effectively stripping and dispersing organic pollutants, greases, and tightly adhering impurities that are difficult to reach with conventional rinsing. By introducing ultrasonic assistance, the cleaning process is enhanced at the microscopic scale, thereby significantly improving the purification depth and speed of complex contaminated waste salt.

[0070] Example 5:

[0071] Referring to Figures 1-7, in addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0072] The ultrasonic transducer 8 is installed on the bottom wall and / or side wall of the cleaning tank 1, thereby enabling it to directly emit high-frequency sound waves into the saturated brine in the tank. By embedding or attaching the ultrasonic transducer 8 to the tank structure, the generated ultrasonic waves can propagate in the saturated brine and induce a dense cavitation effect, allowing the cavitation effect to fully develop within the cleaning tank 1. A large number of microbubbles are continuously generated and imploded around the waste salt particles and in the gaps, releasing strong local impacts and microflows, thereby physically peeling off and dispersing stubborn impurities such as organic matter and grease attached to the surface of the salt particles and even in the micropores.

[0073] Example 6:

[0074] Referring to Figures 1-7, in addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0075] The spraying device also includes a pure water nozzle 32, which is located downstream of the saturated brine nozzle 31;

[0076] The pure water nozzle 32 can output pure water to replenish the saturated brine while washing the waste salt.

[0077] The saturated brine nozzles are arranged in a zoned design. Along the feeder's conveying direction, the downstream section is equipped with pure water nozzles 32, and the upstream section with saturated brine nozzles 31. The pure water nozzles 32 are used to replenish pure water during the final stage of cleaning, simultaneously cleaning the waste salt. This maintains the balance of liquid level and concentration within the cleaning tank and also rinses the salt particles in the final cleaning stage, reducing impurity residue. The saturated brine nozzles 31 are directly connected to the output of the water circulation system 40, spraying purified circulating saturated brine, ensuring the cleanliness of the final salt product while maximizing water resource utilization efficiency.

[0078] Example 7:

[0079] Referring to Figures 1-7, in addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0080] It also includes a solid-liquid separation device 6, located downstream of the feeder, to receive and separate the waste salt and saturated brine from the feeder output;

[0081] It also includes a water circulation system 40, the inlet of which is connected to the saturated brine outlet of the solid-liquid separation device 6, and the outlet of the water circulation system 40 is adapted to input saturated brine into the cleaning tank and the saturated brine nozzle.

[0082] The solid-liquid separation device 6 and the water circulation system 40 together with the aforementioned cleaning equipment form a closed loop for resource recycling. The solid-liquid separation device 6 is located downstream of the feeder and is used to receive the mixture of waste salt and saturated brine discharged from the jet nozzle, and to effectively separate the solid salt from the liquid through mechanisms such as centrifugation, filtration, or sedimentation.

[0083] The separated saturated brine enters the water circulation system 40 for treatment to remove impurities from the liquid. The purified saturated brine flows back from the outlet to the cleaning tank and saturated brine nozzle, thus realizing the main recycling of saturated brine and significantly reducing the consumption of fresh water and wastewater discharge.

[0084] Specifically, the water circulation system 40 includes a plate filter and a centrifugal filter connected downstream of the plate filter. The plate filter, as the primary filtration unit, has a relatively large pore size in its filter media, primarily used to intercept and remove larger solid particles and suspended matter from the saturated brine. The liquid pretreated by the plate filter then flows into the downstream centrifugal filter. The centrifugal filter, through the centrifugal force field generated by its high-speed rotation, can efficiently separate even finer suspended particles and some high-density impurities from the liquid.

[0085] The two-stage filters work together in order of increasing filtration precision to form a highly efficient and easy-to-maintain tiered purification process. This not only significantly improves the overall cleanliness of the saturated brine and ensures that the liquid returned to the cleaning tank meets the quality requirements for cleaning and spraying, but also effectively reduces the processing load of a single filter unit, extends the service life of each filter element, and reduces the system's maintenance frequency and operating costs.

[0086] Example 8:

[0087] Figures 1-7 illustrate an embodiment of the present invention providing a waste salt cleaning method, comprising the waste salt cleaning equipment described in any of the above embodiments, the method comprising:

[0088] S1: Inject saturated brine into cleaning tank 1;

[0089] S2: Start the ultrasonic transducer 8 and feeder 2;

[0090] S3: Inject waste salt into cleaning tank 1;

[0091] S4: Start the spray device 3 to flush the waste salt being conveyed by the feeder 2.

[0092] The method first injects an appropriate amount of saturated brine into the cleaning tank 1, and then starts the ultrasonic transducer 8 and the feeder 2. The ultrasonic transducer 8 starts working, generating high-frequency vibration and cavitation effect in the saturated brine, which pre-loosens and initially cleans the waste salt added later.

[0093] Next, the waste salt to be treated is fed into the washing tank 1. Under the inward rotation of the twin-screw feeder, the waste salt and saturated brine are thoroughly stirred, compressed, and conveyed from the inlet end 202 to the outlet end 201. At the same time, the spraying device 3 is activated, and its saturated brine nozzles 31 continuously spray and rinse the waste salt along the conveying path. The sprayed saturated brine flows back to the washing tank 1 under gravity, and undergoes multi-stage filtration and re-pumping through the water circulation system 40 to achieve the circulation purification and reuse of the saturated brine. Finally, the mixture of deep-washed waste salt and liquid is discharged through the funnel-shaped jet nozzle 4 at the outlet end 201 and enters the subsequent processing section.

[0094] This method integrates multiple mechanisms, including mechanical conveying, stirring and extrusion, spraying and rinsing, ultrasonic cavitation, and liquid circulation filtration, to achieve step-by-step and in-depth cleaning of waste salt during continuous operation. Ultrasonic cavitation acts at the microscopic level, the mechanical action of the twin-screw extruder focuses on macroscopic mixing and surface friction, while the circulating spray provides continuous fluid scouring force. These three mechanisms synergistically significantly improve the removal efficiency of soluble impurities, insoluble substances, and organic pollutants. Practice shows that this process can achieve a cleaning efficiency of over 98% and stably reduce the total organic carbon content in the treated salt to 15-30 mg / g. The entire process is clear and easy to automate, ensuring efficient and stable cleaning results while also offering advantages such as simple operation, resource recycling, and low operating and maintenance costs.

[0095] In S4, pure water can also be output through pure water nozzle 32 to replenish water to the saturated brine.

[0096] Furthermore, in S2, the feeder 2 can be controlled to periodically rotate in both directions to achieve a more thorough agitation of the waste salt and saturated brine, thereby improving the cleaning effect of the waste salt.

[0097] Furthermore, when the amount of water-soluble impurities in the waste salt reaches a threshold, the waste salt cleaning equipment can be set up in multiple sets connected in series to better clean the waste salt.

[0098] It can be understood that, except for conflicting parts, the above embodiments 1-8 can be freely combined to form other embodiments of the present invention.

[0099] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0100] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0101] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0102] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0103] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A waste salt washing device, characterized in that, The device includes a cleaning tank (1), a feeder (2), and a spraying device (3); the outlet end (201) of the feeder (2) is inclined upward, the cleaning tank (1) is connected to the inlet end (202) of the feeder (2) and is suitable for containing waste salt and saturated brine; the spraying device (3) includes several sets of saturated brine nozzles (31) distributed along the extension direction of the feeder (2), the saturated brine nozzles (31) are suitable for outputting saturated brine into the feeder (2); wherein, the feeder (2) is configured to convey the waste salt and saturated brine in the cleaning tank (1) from the inlet end (202) to the outlet end (201), and to make the waste salt tumble during the conveying process, and the saturated brine sprayed by the saturated brine nozzles (31) can rinse the tumbling waste salt.

2. The waste salt washing equipment as described in claim 1, characterized in that, It also includes an ultrasonic transducer (8), which is placed on the cleaning tank (1) and is suitable for generating high-frequency sound waves and causing the saturated brine and waste salt to vibrate through cavitation effect.

3. The waste salt washing equipment as described in claim 2, characterized in that, The ultrasonic transducer (8) is disposed on the bottom wall and / or side wall of the cleaning tank (1).

4. The waste salt washing equipment as described in claim 1, characterized in that, It also includes a jet outlet (4) located at the outlet end (201) to output a mixture of waste salt and saturated brine.

5. The waste salt washing equipment as described in claim 1, characterized in that, The feeder (2) is a twin-screw feeder comprising two parallel screws (21) with opposite rotation directions.

6. The waste salt washing equipment as described in claim 5, characterized in that, Both screws (21) rotate inward relative to the axis of the feeder (2).

7. The waste salt washing equipment as described in claim 1, characterized in that, The spraying device (3) also includes a pure water nozzle (32), which is located downstream of the saturated brine nozzle (31); the pure water nozzle (32) can output pure water to replenish the saturated brine while cleaning the waste salt.

8. The waste salt washing equipment as described in any one of claims 1-7, characterized in that, It also includes a solid-liquid separation device (6), located downstream of the feeder (2), to receive and separate the waste salt and saturated brine output from the feeder.

9. The waste salt washing equipment as described in claim 8, characterized in that, It also includes a water circulation system (40), the inlet of which is connected to the saturated brine outlet of the solid-liquid separation device (6), and the outlet of the water circulation system (40) is adapted to input saturated brine into the cleaning tank (1) and the saturated brine nozzle (31).

10. A method for cleaning waste salt, characterized in that, The method is applied to a waste salt cleaning device as described in any one of claims 2-9, and includes: S1: injecting saturated brine into the cleaning tank (1); S2: activating the ultrasonic transducer (8) and the feeder (2); S3: injecting waste salt into the cleaning tank (1); S4: activating the spray device (3) to flush the waste salt being conveyed by the feeder (2).

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