Continuous totally-enclosed solid-liquid separation system

Abstract

The invention discloses a continuous totally-enclosed solid-liquid separation system which comprises a preheater, a film evaporator, a continuous vacuum suction filter, a positive displacement pump, a horizontal double-shaft dryer, a double-spiral discharging machine and a stock bin, by arranging the preheater, the film evaporator, the continuous vacuum suction filtration machine, the displacement pump, the horizontal double-shaft drying machine, the double-spiral discharging machine and the stock bin which are communicated in sequence, continuous treatment of materials is achieved, efficiency is improved, solid-liquid separation quality is improved, the materials are primarily treated in the preheater, the film evaporator and the continuous vacuum suction filtration machine, the solid content of the materials is increased, and the solid content of the materials is reduced. And then fine solid-liquid separation is carried out through the horizontal double-shaft drying machine, on one hand, the separation quality can be improved, on the other hand, the cost can be reduced, all the components in the embodiment are communicated through pipelines, the whole solid-liquid separation process of the materials can be kept closed and in a whole-process negative pressure state, the sealing performance is improved, harmful gas and liquid leakage is avoided, and the device is more environmentally friendly and safer.

Description

Technical Field

[0001] The invention relates to the technical field of solid-liquid separation, in particular to the technical field of continuous fully enclosed solid-liquid separation system. Background Art

[0002] In industrial production scenarios, it is often necessary to separate high-salt liquids containing solid products into solids and liquids, and then treat the separated solid products and the remaining high-salt liquids separately. The treatment of high-salt liquids involves a series of process operations to achieve recovery or safe discharge. At present, the commonly used separation method is to use a plate and frame filter press, but when the filtration reaches a certain level, the filter medium is prone to reach its filtration limit, resulting in solid penetration, which in turn reduces the final yield of the solid product. For the separated high-salt liquid, common treatment methods include evaporation concentration and evaporation crystallization for recovery, or discharge after purification. Evaporation concentration and evaporation crystallization require multiple equipment and multiple processing steps to analyze and separate the salt in the high-salt liquid. The existing processing equipment is independent of each other, and it is impossible to combine multiple sets of equipment to continuously treat the liquid continuously. The process is cumbersome and inefficient, and the treatment process is prone to liquid and gas leakage, affecting the environment. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to propose a continuous fully enclosed solid-liquid separation system that can continuously perform solid-liquid separation treatment on liquids with high efficiency. The solid-liquid treatment process is fully enclosed to avoid leakage of harmful gases and liquids, which is more environmentally friendly.

[0004] To achieve the above-mentioned purpose, the present invention proposes a continuous fully enclosed solid-liquid separation system, comprising a preheater, a thin film evaporator, and a continuous vacuum filter, wherein the input end of the preheater is used to input materials, the output end of the preheater is connected to the input end of the thin film evaporator through a pipeline, the material output end at the bottom of the thin film evaporator is connected to the continuous vacuum filter through a pipeline, and a positive displacement pump is provided between the continuous vacuum filter and the thin film evaporator, the continuous vacuum filter comprises a filter discharge port and a liquid discharge port, the filter discharge port is connected to a horizontal double-axis dryer, the output end of the horizontal double-axis dryer is provided with a double-screw discharger, and the output end of the double-screw discharger is connected to a silo through a pipeline; The thin film evaporator is provided with an evaporator negative pressure port, the continuous vacuum filter is provided with a filter negative pressure port, and the horizontal double-axis dryer is provided with a dryer negative pressure port. The evaporator negative pressure port, the filter negative pressure port, and the dryer negative pressure port are all connected to a negative pressure source, so that the preheater, the thin film evaporator, the continuous vacuum filter, the horizontal double-axis dryer, the double-screw discharger and the pipelines used to connect the above components are all in a negative pressure state during operation.

[0005] Preferably, a condenser is further included, the condenser comprising a condensation tank and a condensation heat exchanger arranged on the upper part of the condensation tank, the condensation tank is provided with a tank body input port on the side and a tank body liquid outlet on the bottom, the condensation heat exchanger is provided with a tank body vacuum port on the top, the tank body vacuum port is connected to a negative pressure source, and the tank body input port is used to be connected to the negative pressure port of the evaporator, the negative pressure port of the filter, and the negative pressure port of the dryer.

[0006] Preferably, the operating temperature of the thin film evaporator is 100°C-150°C.

[0007] Preferably, the thin film evaporator processes the solid content of the material to 30%-50%, and the continuous vacuum filter processes the solid content of the material to 60%-80%.

[0008] Preferably, the continuous vacuum filter comprises a filter housing, a shell inner cavity is provided in the filter housing, a screw conveying shaft is provided in the shell inner cavity horizontally or obliquely, a driving mechanism for driving the screw conveying shaft to rotate to convey materials is provided on the filter housing, a filter cage cooperating with the screw conveying shaft is provided in the shell inner cavity, the screw conveying shaft is arranged in the filter cage, a liquid recovery bucket is provided on the lower side of the filter cage, a plurality of filter negative pressure ports for connecting with a negative pressure source are provided on the liquid recovery bucket, a liquid outlet is also provided on the liquid recovery bucket, and a material input port and a filter outlet for cooperating with the screw conveying shaft are respectively provided on the filter housing near the input end and the output end of the screw conveying shaft.

[0009] Preferably, the spiral conveying shaft comprises a first spiral shaft and a second spiral shaft arranged in parallel, and the first spiral shaft and the second spiral shaft run synchronously and maintain the same direction of conveying.

[0010] Preferably, a plurality of spray heads arranged toward the filter cage are provided in the filter housing.

[0011] Preferably, the filter cage is divided into a plurality of filtration grades with gradually increasing filter mesh sizes from the material input port to the filter outlet port.

[0012] Preferably, an independent liquid recovery bucket corresponding to the above-mentioned suction filtration and classification is provided at the lower side.

[0013] Preferably, the material input port is arranged on the upper side of the filter cage, and the filter outlet is arranged on the lower side of the filter cage.

[0014] Preferably, a transparent observation window is provided on the discharge port of the suction filter.

[0015] The beneficial effects of a continuous fully enclosed solid-liquid separation system of the present invention: the present invention realizes continuous processing of materials by arranging a preheater, a thin film evaporator, a continuous vacuum filter, a volumetric pump, a horizontal twin-axis dryer, a double-screw discharger, and a silo that are connected in sequence, thereby improving efficiency and the quality of solid-liquid separation. The materials are preliminarily processed in the preheater, the thin film evaporator, and the continuous vacuum filter to increase the solid content of the materials, and then are finely separated from the solid by the horizontal twin-axis dryer. On the one hand, the separation quality can be improved, and on the other hand, the cost can be reduced. In this embodiment, the various components are connected by pipelines, so that the solid-liquid separation process of the materials can be kept closed throughout the whole process, and a negative pressure state can be maintained throughout the whole process, thereby improving the sealing performance, avoiding the leakage of harmful gases and liquids, and being more environmentally friendly and safe.

[0016] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system structure of a continuous fully enclosed solid-liquid separation system of the present invention.

[0018] Figure 2 The invention discloses a horizontal double-shaft dryer and a double-screw discharger structure diagram of a continuous fully enclosed solid-liquid separation system.

[0019] Figure 3 The invention discloses a structural schematic diagram of a thin film evaporator, a continuous vacuum filter, a positive displacement pump, a horizontal double-shaft dryer and a double-screw discharger of a continuous fully enclosed solid-liquid separation system.

[0020] Figure 4 The present invention is a schematic diagram of the main structure of a continuous vacuum filter of a continuous fully enclosed solid-liquid separation system.

[0021] Figure 5 The present invention is a schematic diagram of a top view of the structure of a continuous vacuum filter in a continuous fully enclosed solid-liquid separation system.

[0022] Figure 6 The present invention is a schematic diagram of the side structure of a continuous vacuum filter of a continuous fully enclosed solid-liquid separation system.

[0023] Figure 7 The present invention is a schematic diagram of the condenser structure of a continuous fully enclosed solid-liquid separation system.

[0024] Figure 8 It is a schematic diagram of the structure of the continuous vacuum filter of Example 3.

[0025] in: 1-preheater; 2-thin film evaporator; 3-continuous vacuum filter; 4-displacement pump; 5-horizontal double-shaft dryer; 6-double-screw discharger; 7-bin; 8-condenser; 21-evaporator negative pressure port; 51-dryer negative pressure port; 81-condensation tank; 82-condensation heat exchanger; 83-tank input port; 84-tank liquid outlet; 85-tank vacuum port; 31-filter housing; 32-screw conveying shaft; 33-driving mechanism; 34-filter cage; 35-liquid recovery bucket; 36-spray head; 311-material input port; 312-filter discharge port; 321-first screw shaft; 322-second screw shaft; 3121-transparent observation window; 3211-spindle body; 3212-spiral blade; 351-filter negative pressure port; 352-liquid outlet. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0027] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invention product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of 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. Embodiment 1:

[0030] See also Figure 1-Figure 4 The present invention discloses a continuous fully enclosed solid-liquid separation system, comprising a preheater 1, a thin film evaporator 2, and a continuous vacuum filter 3. The input end of the preheater 1 is used to input materials. The preheater 1 is used to preheat the input materials to increase the material temperature for subsequent processing. The output end of the preheater 1 is connected to the input end of the thin film evaporator 2 through a pipeline. The thin film evaporator 2 is used to perform preliminary processing on the materials, evaporate the liquid in the materials, and increase the solid content of the materials. The material output end at the bottom of the thin film evaporator 2 is connected to the continuous vacuum filter 3 through a pipeline, and a positive displacement pump 4 is provided between the continuous vacuum filter 3 and the thin film evaporator 2. The continuous vacuum filter 3 includes a filter discharge port 312 and a liquid outlet 352. The filter discharge port 312 is connected to a horizontal double-axis dryer 5. The output end of the horizontal double-axis dryer 5 is provided with a double-screw discharger 6. The output end of the double-screw discharger 6 is connected to a silo 7 through a pipeline. The thin film evaporator 2 is provided with an evaporator negative pressure port 21, the continuous vacuum filter 3 is provided with a filter negative pressure port 351, and the horizontal double-axis dryer 5 is provided with a dryer negative pressure port 51. The evaporator negative pressure port 21, the filter negative pressure port 351, and the dryer negative pressure port 51 are all connected to a negative pressure source, so that the preheater 1, the thin film evaporator 2, the continuous vacuum filter 3, the horizontal double-axis dryer 5, the double-screw discharger 6 and the pipelines used to connect the above components are all in a negative pressure state during operation. In this embodiment, a preheater 1, a thin film evaporator 2, a continuous vacuum filter 3, a volumetric pump 4, a horizontal double-axis dryer 5, a double-screw discharger 6, and a silo 7 are arranged in sequence to realize continuous processing of materials, improve efficiency, and improve the quality of solid-liquid separation. The materials are preliminarily processed in the preheater 1, the thin film evaporator 2, and the continuous vacuum filter 3 to increase the solid content of the materials, and then pass through the horizontal double-axis dryer 5 for fine solid-liquid separation. On the one hand, the separation quality can be improved, and on the other hand, the cost can be reduced. Because the cost of the horizontal double-axis dryer 5 is relatively high, if all of them pass through the horizontal double-axis dryer 5 for the whole solid-liquid separation, then the horizontal double-axis dryer 5 used needs to be larger in scale and more expensive, while the material after the previous treatment in this embodiment can be separated into solid and liquid using a smaller horizontal double-axis dryer 5, which is less expensive, the displacement pump 4 between the thin film evaporator 2 and the continuous vacuum filter 3 can play a sealing role between the two, and the displacement pump 4 can also play a metering role to avoid the mutual influence of the vacuum systems of the two, and the double-screw discharger 6 at the discharge position of the horizontal double-axis dryer 5 can also play a certain sealing role to avoid affecting the negative pressure environment in the horizontal double-axis dryer 5. In this embodiment, the various components are connected by pipelines, which can keep the solid-liquid separation process of the material closed and in a negative pressure state throughout the process, improve the sealing performance, avoid the external environment from polluting the material, and affect the solid-liquid separation of the material, and improve the quality of solid-liquid separation.

[0031] See also Figure 1 , Figure 7 Based on the first embodiment, refer to Figure 1 , and also includes a condenser 8, the condenser 8 includes a condensation tank 81 and a condensation heat exchanger 82 arranged on the upper part of the condensation tank 81, the condensation tank 81 is provided with a tank input port 83 on the side and a tank liquid outlet 84 at the bottom, the top of the condensation heat exchanger 82 is provided with a tank vacuum port 85, the tank vacuum port 85 is connected to the negative pressure source, and the tank input port 83 is used to communicate with the evaporator negative pressure port 21, the suction filter negative pressure port 351, and the dryer negative pressure port 51. The air extracted from the thin film evaporator 2, the continuous vacuum filter 3, and the horizontal double-axis dryer 5 is condensed by the condenser 8, the moisture in the air is separated, and collected for standby use to avoid waste and pollution of the environment.

[0032] Preferably, the operating temperature of the thin film evaporator 2 is 100°C-150°C.

[0033] Preferably, the thin film evaporator 2 is a scraped thin film evaporator, and the horizontal double-shaft dryer 5 is a horizontal double-shaft self-cleaning dryer.

[0034] Preferably, the thin film evaporator 2 processes the solid content of the material to 30%-50%, and the continuous vacuum filter 3 processes the solid content of the material to 60%-80%. The solid content of the material is gradually increased to facilitate the solid-liquid separation of the horizontal double-axis dryer 5. Embodiment 2:

[0035] See also Figure 4 , Figure 5 and Figure 6 The continuous vacuum filter 3 includes a filter housing 31, a housing inner cavity is provided in the filter housing 31, a screw conveying shaft 32 is provided in the housing inner cavity horizontally or obliquely, a driving mechanism 33 for driving the screw conveying shaft 32 to rotate to convey materials is provided on the filter housing 31, a filter cage 34 cooperating with the screw conveying shaft 32 is provided in the housing inner cavity, the screw conveying shaft 32 is arranged in the filter cage 34, a liquid recovery hopper 35 is provided at the lower side of the filter cage 34, a plurality of filter negative pressure ports 351 for communicating with a negative pressure source are provided on the liquid recovery hopper 35, a liquid outlet 352 is also provided on the liquid recovery hopper 35, a material input port 311 and a filter outlet 312 for cooperating with the screw conveying shaft 32 are respectively provided at the input end and the output end of the filter housing 31 near the screw conveying shaft 32. When this embodiment is working, the input equipment that needs solid-liquid separation is introduced through the material input port 311, and the material is transported toward the liquid outlet 352 through the rotation of the spiral conveying shaft 32. During the transportation process, the material passes through the filter cage 34, and the negative pressure port 51 of the dryer is connected to the negative pressure source, so that the liquid recovery bucket 35 is in a negative pressure state. Under the action of the negative pressure, the liquid in the filter cage 34 is separated through the filter cage 34 and flows into the liquid recovery bucket 35, and is discharged through the liquid outlet 352 to achieve solid-liquid separation. During the solid-liquid separation process, the spiral conveying shaft 32 can keep conveying, thereby achieving uninterrupted solid-liquid separation and improving efficiency. The separated solid can be output through the filter outlet 312.

[0036] See also Figure 5 and Figure 6 The spiral conveying shaft 32 includes a first spiral shaft 321 and a second spiral shaft 322 arranged in parallel, and the first spiral shaft 321 and the second spiral shaft 322 run synchronously and keep conveying in the same direction. Double-axis conveying has better conveying efficiency, and the spiral blades 3212 of the two spiral conveying shafts 32 are staggered, and can cooperate with each other to clean the residual solids between the spiral blades 3212 for each other.

[0037] See also Figure 5 The first spiral shaft 321 and the second spiral shaft 322 both include a main shaft body 3211 and spiral blades 3212 wound on the surface of the main shaft body 3211. The diameter of the main shaft body 3211 remains unchanged from the material input port 311 to the filter discharge port 312.

[0038] See also Figure 4 The filter housing 31 is further provided with a plurality of spray heads 36 disposed toward the filter cage 34. The spray heads 36 are disposed on the upper side of the filter cage 34, and the filter cage 34 can be cleaned by the spray heads 36 to avoid clogging.

[0039] Preferably, the liquid source of the spray head 36 can be connected to the liquid outlet 352 to recycle the precipitated liquid, or it can be connected to an external liquid source.

[0040] See also Figure 4 The filter cage 34 is divided into two filtration grades S1 and S2 from the material input port 311 to the filter outlet 312. The filtration mesh number of S1 is greater than the filtration mesh number of S2, and the lower sides of S1 and S2 are respectively provided with independent liquid recovery buckets 35 corresponding thereto. The filtration is gradually refined to improve the filtration quality.

[0041] See also Figure 4 The filter outlet 312 is provided with a transparent observation window 3121, which is convenient for observing the discharge state and grasping the discharge situation in real time. Embodiment three:

[0042] See also Figure 8 Based on the second embodiment, the difference between this embodiment and the second embodiment is that the diameter of the main shaft body 3211 gradually increases from the material input port 311 to the filter outlet port 312. In this embodiment, the main shaft body 3211 with a gradually increasing diameter can cooperate with the filter cage 34 to squeeze the material during the material transportation process, which is conducive to squeezing out the liquid in the material and improving the solid-liquid separation effect.

[0043] Working process of the present invention: In the working process of the continuous fully enclosed solid-liquid separation system of the present invention, the material is first input into the preheater 1 for preheating, and then transported to the thin film evaporator 2, the thin film evaporator 2 evaporates the material at a temperature of 100°C-150°C, and the solid content of the material is processed to 30%-50%, and then the material is input into the continuous vacuum filter 3 through the volumetric pump 4, the continuous vacuum filter 3 performs preliminary solid-liquid separation on the material, and the solid content of the material is processed to 60%-80%, and then the material is input into the horizontal double-axis dryer 5, the horizontal double-axis dryer 5 performs fine solid-liquid separation on the material, and the solid content of the material is processed to more than 99%, and then the material is input into the silo 7 through the double-screw discharger 6 for storage.

[0044] The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The electric slide rail slide, cylinder, welding machine, electric telescopic rod and internal components of the controller all adopt conventional models in the prior art, and their internal structures belong to the prior art structure. Workers can complete normal operation of them according to the existing technical manual. In addition, the circuit connection adopts the conventional connection method in the prior art, and no specific description is given here.

[0045] It should be noted that, although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.

Claims

1. A continuous fully enclosed solid-liquid separation system, characterized in that: The invention comprises a preheater (1), a thin film evaporator (2), and a continuous vacuum filter (3); the input end of the preheater (1) is used for inputting materials; the output end of the preheater (1) is connected to the input end of the thin film evaporator (2) through a pipeline; the material output end at the bottom of the thin film evaporator (2) is connected to the continuous vacuum filter (3) through a pipeline; a positive displacement pump (4) is provided between the continuous vacuum filter (3) and the thin film evaporator (2); the continuous vacuum filter (3) comprises a filter discharge port (312) and a liquid discharge port (352); the filter discharge port (312) is connected to a horizontal double-shaft dryer (5); a double-screw discharger (6) is provided at the output end of the horizontal double-shaft dryer (5); the output end of the double-screw discharger (6) is connected to a silo (7) through a pipeline; The thin film evaporator (2) is provided with an evaporator negative pressure port (21), the continuous vacuum filter (3) is provided with a filter negative pressure port (351), and the horizontal double-axis dryer (5) is provided with a dryer negative pressure port (51). The evaporator negative pressure port (21), the filter negative pressure port (351), and the dryer negative pressure port (51) are all connected to a negative pressure source, so that the preheater (1), the thin film evaporator (2), the continuous vacuum filter (3), the horizontal double-axis dryer (5), the double-screw discharger (6), and the pipelines used to connect the above components are all in a negative pressure state during operation.

2. A continuous fully enclosed solid-liquid separation system according to claim 1, characterized in that: The invention also comprises a condenser (8), wherein the condenser (8) comprises a condensation tank (81) and a condensation heat exchanger (82) arranged on the upper part of the condensation tank (81); the condensation tank (81) is provided with a tank body input port (83) on the side and a tank body liquid outlet (84) on the bottom; the condensation heat exchanger (82) is provided with a tank body vacuum port (85) on the top; the tank body vacuum port (85) is connected to a negative pressure source; and the tank body input port (83) is used to be connected to the evaporator negative pressure port (21), the filter negative pressure port (351), and the dryer negative pressure port (51).

3. A continuous fully enclosed solid-liquid separation system as claimed in claim 1, characterized in that: The thin film evaporator (2) processes the solid content of the material to 30%-50%, and the continuous vacuum filter (3) processes the solid content of the material to 60%-80%.

4. A continuous fully enclosed solid-liquid separation system as claimed in claim 1, characterized in that: The continuous vacuum filter (3) comprises a filter housing (31), wherein a housing inner cavity is provided in the filter housing (31), a screw conveying shaft (32) is provided in the housing inner cavity in a transverse or oblique direction, a driving mechanism (33) is provided on the filter housing (31) for driving the screw conveying shaft (32) to rotate so as to convey materials, a filter cage (34) cooperating with the screw conveying shaft (32) is provided in the housing inner cavity, and the screw conveying shaft (32) is arranged on the filter cage (34). ), a liquid recovery hopper (35) is provided at the lower side of the filter cage (34), the liquid recovery hopper (35) is provided with a plurality of suction filter negative pressure ports (351) for communicating with a negative pressure source, the liquid recovery hopper (35) is also provided with a liquid outlet (352), and the suction filter housing (31) is provided with a material input port (311) and a suction filter outlet port (312) for cooperating with the screw conveying shaft (32) at the input end and the output end of the screw conveying shaft (32), respectively.

5. A continuous fully enclosed solid-liquid separation system as claimed in claim 4, characterized in that: The screw conveying shaft (32) comprises a first screw shaft (321) and a second screw shaft (322) which are arranged in parallel, and the first screw shaft (321) and the second screw shaft (322) run synchronously and maintain the same direction of conveyance.

6. A continuous fully enclosed solid-liquid separation system as claimed in claim 4, characterized in that: A plurality of spray heads (36) arranged toward the filter cage (34) are also provided in the filter housing (31).

7. A continuous fully enclosed solid-liquid separation system as claimed in claim 4, characterized in that: The filter cage (34) is divided into a plurality of filtration grades with gradually increasing filtration mesh sizes from the material input port (311) to the filter outlet port (312).

8. A continuous fully enclosed solid-liquid separation system as claimed in claim 7, characterized in that: An independent liquid recovery bucket (35) corresponding to the above-mentioned suction filtration and classification is provided at the lower side thereof.

9. A continuous fully enclosed solid-liquid separation system as claimed in claim 4, characterized in that: The material input port (311) is arranged on the upper side of the filter cage (34), and the suction filter discharge port (312) is arranged on the lower side of the filter cage (34).

10. A continuous fully enclosed solid-liquid separation system as claimed in claim 4, characterized in that: A transparent observation window (3121) is provided on the discharge port (312) of the suction filter.

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