Multi-stage extraction leaching device and method

Abstract

The invention belongs to the technical field of grease extraction. The multi-stage extraction and leaching device comprises a first extraction and leaching section, a second extraction and leaching section and a third extraction and leaching section, the first leaching mechanism comprises a first material conveying mechanism and a second material conveying mechanism which have a height difference; the second extraction and leaching section is located below the first extraction and leaching section and comprises a second shell and a second leaching mechanism arranged in the second shell, the feeding end of the second shell communicates with the discharging end of the first shell, and the discharging end of the second shell communicates with the discharging end of the second shell; and the second leaching mechanism comprises a third material conveying mechanism and a fourth material conveying mechanism which have a height difference. The invention further discloses a multi-stage extraction leaching process. The device is used for solving the technical problems that materials of existing leaching equipment are compacted in the conveying process, the permeation rate of a solvent is affected, and the leaching efficiency is low.

Description

Technical Field

[0001] The invention belongs to the technical field of oil extraction, and in particular relates to a multi-stage extraction and leaching device and a multi-stage extraction and leaching method. Background Art

[0002] The extractor is the core equipment of the leaching workshop and the first process of the production operation of the leaching workshop. Its operation effect and production indicators directly affect the results of subsequent equipment and process treatment. Due to the different characteristics of oil, whether the oil in the oil can be extracted well depends on the structure of the extractor. At present, most extractors on the market separate the oil from the oil after the oil accumulates to a certain height on the screen surface, and then it is sprayed, soaked and drained. As mentioned above, the characteristics of the oil have a great influence on the leaching process. The spraying effect, whether the soaking is sufficient, the energy consumption of the equipment operation, the stability of the mechanical movement, etc., are all comprehensive considerations that reflect the advantages and disadvantages of the extractor.

[0003] The extractors on the market are mainly rectangular box-type drag chain extractors and cylindrical flat rotary extractors. Regardless of the type of extractor, the material moves on the screen surface, from the feed to the screen plate to the discharge hopper, and moves forward in a specific shape. For the double-layer extractor, it can be turned over once in the middle. During the movement of the material, the volume of the material increases after being sprayed and soaked by the solvent, and because the material is pushed forward by the push plate, the materials will become more and more crowded, resulting in the following results: 1. Walking in one form for a long time will result in small gaps between materials, which will affect the penetration rate of the solvent. The penetration rate of the solvent from the material will decrease, that is, the penetration rate will deteriorate; the penetration rate will deteriorate, resulting in insufficient immersion; 2. Walking in one form for a long time will cause the material to be compacted, which will increase the "bridging" phenomenon of the material. In addition, the material cannot be loosened, reducing the leaching effect.

[0004] 3. The entire leaching process only involves a single continuous leaching and draining, resulting in low leaching efficiency.

[0005] The above situation eventually leads to a decrease in the leaching effect of the extractor, which is not conducive to the oil plant's goal of saving energy and reducing consumption and improving efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-stage extraction leaching device to solve the technical problem that materials in existing leaching equipment are compacted during transportation, affecting the solvent penetration rate and resulting in low leaching efficiency.

[0007] In order to solve the above technical problems, the present invention adopts the following technical scheme, a multi-stage extraction and leaching device, which is characterized in that it includes: The first extraction and leaching section comprises a first shell and a first leaching mechanism disposed in the first shell; the first leaching mechanism comprises a first material conveying mechanism and a second material conveying mechanism having a height difference; A second extraction and leaching section is located below the first extraction and leaching section, the second extraction and leaching section comprises a second shell, and a second leaching mechanism arranged in the second shell, the feed end of the second shell is connected to the discharge end of the first shell, and the second leaching mechanism comprises a third feeding mechanism and a fourth feeding mechanism with a height difference; The material is transported to the discharge end through the first feeding mechanism and falls onto the second feeding mechanism, thereby realizing the first turning and loosening of the material; the material is transported to the discharge end through the second feeding mechanism and falls onto the third feeding mechanism, thereby realizing the second turning and loosening of the material; the material is transported to the discharge end through the third feeding mechanism and falls onto the fourth feeding mechanism, thereby realizing the third turning and loosening of the material; at the same time, the material is extracted and leached in the first and second extraction and leaching sections.

[0008] The invention can improve the contact rate between the solvent and the oil by increasing the number of times the oil is loosened during operation, thereby reducing residual oil and improving the extraction effect. The invention can ensure the continuity of leaching by continuous operation, thereby ensuring the leaching efficiency.

[0009] In order to solve the technical problem of how to layout the first extraction and leaching section and the second extraction and leaching section, the present invention adopts the following technical solution: the second extraction and leaching section is located directly below the first extraction and leaching section; The first leaching mechanism and the second leaching mechanism are arranged in opposite directions of feeding.

[0010] The present invention designs the second extraction and leaching section to be directly below the first extraction and leaching section, the discharge end of the first extraction and leaching section corresponds to the feed end of the second extraction and leaching section, and the first leaching mechanism and the second leaching mechanism are arranged in opposite directions of feeding, so that the multi-stage extraction and leaching device occupies a small area. The third feeding mechanism and the fourth feeding mechanism have the same running direction, but are opposite to the running directions of the first feeding mechanism and the second feeding mechanism. The fourth feeding mechanism pushes the material toward the discharge port, which is conducive to the upper and lower layer feeding of the material, and does not occupy too much site area when the leaching length is increased.

[0011] In order to solve the technical problem of the large load-bearing capacity of the driving device, the present invention adopts the following technical solution: the second feeding mechanism is located below the discharge end of the first feeding mechanism, and the feed end of the second feeding mechanism overlaps with the discharge end of the first feeding mechanism; the second feeding mechanism is connected to the first feeding mechanism via a first transmission mechanism, and the first feeding mechanism or the second feeding mechanism is connected to the first driving mechanism.

[0012] The first feeding mechanism and the second feeding mechanism of the first extraction and leaching section are arranged one above and one below, one left and one right. The first feeding mechanism and the second feeding mechanism are in a step-like shape, separated from each other and partially overlapped. The first extraction and leaching section includes a conveying system composed of the first and feeding mechanisms. The conveying system is driven separately. Due to the separate drive, the load it bears is reduced by 50%. The load reduction at low speed increases the safety factor of the drive, and the selection of the drive device will also be relatively simple. The present invention uses a single-layer independent drive on the power to improve transmission efficiency and reduce energy consumption.

[0013] In order to solve the technical problem of how to realize the first and second feeding mechanisms, the present invention adopts the following technical solution: the first feeding mechanism includes a first chain scraper assembly; a first supporting screen plate assembly is arranged below the upper chain scraper of the first chain scraper assembly, for supporting materials and filtering solvents; The second feeding mechanism includes a second chain scraper assembly, and the second chain scraper assembly is connected to the second chain scraper assembly via a first transmission mechanism; A second supporting screen plate assembly is arranged below the upper chain scraper of the second chain scraper assembly for supporting materials and filtering solvents.

[0014] The material on the first supporting screen plate assembly is pushed forward by the scraper of the first chain scraper assembly, and the solvent above the material is continuously sprayed, and extrusion begins to occur inside the material. At this time, when it reaches the discharge end of the first feeding mechanism, the material is turned over once, and the material is loosely reorganized once, thus avoiding the impact of material compaction on the penetration rate.

[0015] In order to solve the technical problem of large load-bearing capacity of the driving device, the present invention adopts the following technical solution: the fourth feeding mechanism is located below the discharge end of the third feeding mechanism, and the feed end of the fourth feeding mechanism overlaps with the discharge end of the third feeding mechanism; the fourth feeding mechanism is connected to the third feeding mechanism via the second transmission mechanism, and the third feeding mechanism or the fourth feeding mechanism is connected to the second driving mechanism.

[0016] The third feeding mechanism and the fourth feeding mechanism of the second extraction and leaching section are arranged one above and one below, one left and one right. The third feeding mechanism and the fourth feeding mechanism are in a step-like shape, separated from each other and partially overlapped.

[0017] The second extraction and leaching section each includes a conveying system consisting of the third and fourth feeding mechanisms. The conveying system is driven separately. Due to the separate drive, the load it bears is reduced by 50%. The load reduction at low speed increases the safety factor of the drive, and the selection of the drive device will also be relatively simple.

[0018] The present invention uses dual input control on the power, that is, single-layer independent drive, to improve transmission efficiency and reduce energy consumption. Each individual conveying system moves independently and at the same speed, which not only ensures the synchronization of materials, but also reduces the load requirements of the conveying system.

[0019] In order to solve the technical problem of how to realize the third and fourth feeding mechanisms, the present invention adopts the following technical solution: the third feeding mechanism includes a third chain scraper assembly; a third supporting screen plate assembly is arranged below the upper chain scraper of the third chain scraper assembly to support the material and filter the solvent; The fourth feeding mechanism comprises a fourth chain scraper assembly, and the fourth chain scraper assembly is connected to the third chain scraper assembly via a second transmission assembly; A fourth supporting screen plate assembly is arranged below the upper chain scraper of the fourth chain scraper assembly for supporting materials and filtering solvents.

[0020] When the material reaches above the third supporting screen plate assembly of the second extraction section, the third scraper chain assembly on the third feeding mechanism pushes it in the opposite direction to the material of the first extraction and leaching section. The material is flipped from the left end of the third feeding mechanism to the fourth feeding mechanism and falls to the feeding end of the fourth supporting screen plate assembly, just like the feeding relationship between the first feeding mechanism and the second feeding mechanism. The material is flipped and loosened and reorganized every time the material is fed between two feeding mechanisms, which effectively solves the problem of compaction of the material during the leaching process, thereby improving the leaching effect.

[0021] In order to solve the technical problem of solvent source, the present invention adopts the following technical solution: the first extraction and leaching section also includes a first spraying component, which is used to spray solvent on the materials on the first feeding mechanism and the second feeding mechanism; The second extraction and leaching section also includes a second spraying assembly for spraying solvent on the materials on the third feeding mechanism and the fourth feeding mechanism, and the spraying efficiency is high. In order to solve the technical problem of solvent recycling, the present invention adopts the following technical solution: a feed port is provided on the first shell; a first oil hopper is provided on the first shell to collect the solvent filtered by the sieve plate support assembly; the first oil hopper is connected to the first spray assembly to form a circulating spray structure; A discharge port is arranged on the second shell, and the discharge port and the feed port are located on the same side; a second oil hopper is arranged on the second shell for collecting the solvent filtered by the sieve plate support assembly; the second oil hopper is connected to the second spray assembly to form a circulating spray structure.

[0022] The first and second shells are connected with the oil bucket and the spray assembly by pipelines to realize the recycling of solvent and reduce energy consumption.

[0023] The discharge port is located at the lower left end of the second extraction and leaching section. The feed port and the discharge port are in an upper and lower relationship and are both at the same end. This is conducive to the upper and lower layer feeding of materials, and will not occupy too much site area while increasing the leaching length.

[0024] In order to solve the technical problem of draining after extraction and leaching, the present invention adopts the following technical solution: the area where the fourth feeding mechanism is located forms a draining section for draining the material treated by extraction and leaching; The draining section is provided with a third spraying assembly for spraying fresh solvent on the material in the draining section; the third spraying assembly is located at the feed end of the draining section and at 1 / 3 of the length of the fourth feeding mechanism; A drain bucket is arranged at the bottom of the drain section for collecting the solvent in the drain section.

[0025] The fourth feeding mechanism and the fourth screen plate support assembly are the draining section, which is only used for fresh solvent to flush the material, and then drain naturally after flushing. Since the draining area and the lower draining bucket are independent structures, a forced draining system can be used to reduce the solvent content of the wet meal.

[0026] In order to solve the technical problem of how to set the slide pipe, the present invention adopts the following technical solution: the second shell is connected to the discharge end of the first shell via the slide pipe, and the slide pipe is inclined; A spray pipe is arranged on the discharge port of the chute for spraying solvent on the material passing through the chute.

[0027] The material chute is tilted up and down, with the upper part tilted to the right (i.e. the discharge end of the second feeding mechanism) and the lower part tilted to the left (i.e. the feed end of the third feeding mechanism) to ensure that the material falls on the third feeding mechanism. A spray pipe is installed on the chute to spray the material before it falls on the sieve plate of the second extraction and leaching section. At this time, spraying in a loose state effectively improves the contact rate, which not only ensures the leaching effect but also improves the utilization rate of the solvent.

[0028] In order to solve the technical problem that the material falls on the spray pipe and affects the spraying, the present invention adopts the following technical solution: the spray pipe is located on the inner side of the discharge port of the chute away from the material. A spray pipe is installed on the left side of the lower part of the material chute, and above the spray pipe is the left enclosure of the chute. The left enclosure covers the spray pipe from the top to the bottom projection area. When the material of the first extraction and leaching section falls to the second extraction and leaching section through the chute, the material will not fall on the spray pipe and will not affect the spraying work.

[0029] In order to solve the technical problem of how to layout the first and second shells, the present invention adopts the following technical solution: the first shell is in a Z shape, and the second shell is in a reverse Z shape, which will not occupy too much site area while increasing the leaching length; A column support assembly is arranged between the second shell and the first shell, and a slide pipe installation space is formed by utilizing the column support assembly.

[0030] In order to further improve the leaching and filtering effect, the present invention adopts the following technical solution: the discharge ends of the first feeding mechanism, the second feeding mechanism, the third feeding mechanism, and the fourth feeding mechanism are all arranged to be inclined upward; The slope of the fourth feeding mechanism is 1:10. Except for draining at the concave filtering structure of the concave filter plate, there is a tendency to move upward during the forward movement along the entire length of the draining section, which improves the overall draining effect.

[0031] The first feeding mechanism and the second feeding mechanism can be designed to be tilted upward on the right according to various material conditions, that is, the material runs to the right front on the screen surface; the third feeding mechanism and the fourth feeding mechanism are tilted upward on the left, that is, the material runs to the left front on the screen surface. Such leaching operation mode can make the leaching and filtration effect better.

[0032] In order to further improve the technical problem of leaching effect, the present invention adopts the following technical scheme: the first, second, third and fourth supporting screen plate assemblies include screen plates and supporting frames, and the supporting frames are arranged at the bottom of the screen plates; The sieve plate comprises a concave sieve plate and horizontal sieve plates at both ends of the concave sieve plate. The concave sieve plate and the horizontal sieve plate have a smooth transition, and the concave sieve plate forms a soaking area.

[0033] Since the filter screen plate is a shallow concave surface and the screen surface is a concave structure, the oil surface on the concave screen plate is also concave. A large amount of solvent spray is arranged on the upper part of the material layer length L1 (i.e. the concave screen plate length), and a soaking pool is formed within the length L1 of the concave surface. In this way, the extraction process is more conducive to the solvent spraying + soaking process.

[0034] In order to solve the technical problem of how to realize the concave sieve plate, the present invention adopts the following technical solution, wherein the concave sieve plate comprises: A first concave sieve plate, symmetrically arranged in the middle of the concave sieve plate; The second concave sieve plate is symmetrically arranged at two ends of the concave sieve plate, and the inclination of the second concave sieve plate is greater than the inclination of the first concave sieve plate.

[0035] In order to solve the above technical problems, the present invention adopts the following technical solution: the slope of the second concave screen plate is twice the slope of the first concave screen plate.

[0036] In order to solve the technical problem that the oil after soaking has a high solvent content and needs to be drained, the present invention adopts the following technical solution: no spray assembly is provided above the second inner concave screen plate at the discharge end. Without spraying, the solvent on the surface of the oil will move upward due to self-generated gravity and the oil will move forward, so the oil after soaking will be better drained.

[0037] In order to further improve the leaching effect, the present invention adopts the following technical scheme: the feed end of the first feeding mechanism forms a pre-leaching section; the middle part and the discharge end of the first feeding mechanism form a leaching section. The present invention is divided into different working areas, namely pre-leaching, extraction leaching (first extraction leaching, second extraction leaching), and draining. The section from the feed inlet to the front is the pre-leaching area, and the spray system performs high-flow spraying, and the composition ensures the amount of solvent required for material leaching.

[0038] In order to solve the technical problem of material accumulation at the scraper angle of the chain scraper, the present invention adopts the following technical solution: the scraper backs of the first, second, third and fourth chain scraper assemblies are provided with reinforcing ribs, and anti-material accumulation sealing plates are provided on the reinforcing ribs. The material pushing surface of the scraper structure is a flat plate, and the scraper back has reinforcing ribs. A thin sealing plate is covered on the outside of the reinforcing ribs to ensure that the scraper back is an inclined transition surface, so that the phenomenon of material accumulation at the scraper angle will not occur.

[0039] The second object of the present invention is achieved through the following technical scheme: a multi-stage extraction and leaching method, characterized in that it is achieved by using any of the multi-stage extraction and leaching devices described above.

[0040] In order to solve the technical problem of how to implement the multi-stage extraction and leaching method, the present invention adopts the following technical solution, the multi-stage extraction and leaching method comprises the following steps: pre-leaching: the material at the discharge end of the first feeding mechanism is pre-leached; Primary extraction and leaching: The first feeding mechanism transports the material and continuously sprays the solvent on the material. The material is squeezed inside and transported to the end of the first feeding mechanism and falls to the second feeding mechanism. The material is turned over, loosened, and reorganized. The second feeding mechanism continues to transport the material and continuously sprays the solvent on the material. The material is compacted. When it reaches the rightmost end of the second feeding mechanism, the leaching process of the material in the first extraction section ends. Secondary extraction and leaching: the material falls into the second extraction and leaching section, where it is turned over, loosened, and reorganized three times. The material continues to be leached, and the third feeding mechanism transports the material. At the same time, the solvent is continuously sprayed on the material. The material is squeezed inside and transported to the discharge end of the third feeding mechanism, and falls to the fourth feeding mechanism. The material is turned over, loosened, and reorganized four times. Draining: The fourth feeding mechanism continues to transport the material and continuously sprays fresh solvent on the material. The material is compacted and drained before being discharged.

[0041] During the entire extraction process, the oil always maintains the movement form of "translation-downward-upward-translation-flipping" for many times, and the solvent in the extraction stage extracts the oil in the form of "spraying-immersing-draining-spraying" for many times. This extraction method improves the extraction effect, optimizes the residual oil index, reduces the solubility content of wet meal, and ensures that the subsequent process DTDC can reduce the use of steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a front view of the multi-stage extraction and leaching device of the present invention; Figure 2 It is a left side view of the multi-stage extraction leaching device of the present invention; Figure 3 It is an axonometric diagram of the multi-stage extraction leacher of the present invention; Figure 4 It is a schematic diagram of the feeding mechanism of the multi-stage extraction and leaching device of the present invention; Figure 5 It is a component diagram of the slide pipe of the present invention; Figure 6 is an axonometric view of the scraper of the present invention; Figure 7 It is a concave filtering structure diagram of the present invention; Figure 8 It is a structural diagram of the driving mechanism of the present invention; In the figure: 10 multi-stage extraction and leaching devices; 100 first extraction and leaching section; 110 first shell; 111 feed port; 112 first oil bucket; 113 first installation square hole; 114 first manhole; 115 first inspection hole; 116 first sight glass; 120 first feeding mechanism; 130 second feeding mechanism; 131 scraper; 131 reinforcing rib; 1312 anti-accumulation sealing plate; 132 chain; 140 first supporting sieve plate assembly; 141 sieve plate; 14111 concave sieve plate; 14111 concave sieve plate ; 14112 concave sieve plate 2; 1412 horizontal sieve plate; 142 support frame; 150 second support sieve plate assembly; 160 first transmission mechanism; 161 first transmission wheel; 162 first transmission chain; 163 second transmission wheel; 164 first transmission shaft; 165 conveying wheel; 166 transmission wheel; 167 second transmission chain; 168 fourth transmission wheel; 169 second transmission shaft; 170 first driving mechanism; 180 first spray assembly; 190 first chain cover; 200 second extraction and leaching section; 210 second shell; 211 discharge port; 212 second oil bucket; 213 second installation square hole; 214 second manhole; 215 second inspection hole; 216 second sight glass; 220 third feeding mechanism; 230 fourth feeding mechanism; 240 third support sieve plate assembly; 250 fourth support sieve plate assembly; 260 second transmission mechanism; 270 second drive mechanism; 280 second spray group; 290 second chain cover; 300 pre-leaching section; 400 drain section; 410 third spray assembly; 420 drain bucket; 500 immersion area; 610 materials; 620 solvents; 700 slide pipe; 701 spray pipe; 800 column support assembly; 801 first column support; 802 second column support; 803 third column support. DETAILED DESCRIPTION

[0043] like Figure 1-8 As shown, the multi-stage extraction and leaching device 10 includes a first extraction and leaching section 100 and a second extraction and leaching section 200 .

[0044] The first extraction and leaching section 100 includes a first shell 110. The first shell 110 is preferably in a Z-shape. A feed port 111 is provided on the first shell 110; a first oil bucket 112 is provided on the first shell 110 to collect the solvent filtered by the sieve plate support assembly. The top of the first shell 110 is equipped with several first installation square holes 113 to facilitate the installation of large parts. Each first installation square hole 113 is provided with a standard first manhole 114 to facilitate personnel entry and exit for maintenance. A first inspection hole 115 and a first sight glass 116 are correspondingly provided above each first oil bucket 112 to facilitate observation of the interior. The first inspection hole 115 is preferably square.

[0045] The first leaching mechanism is installed in the first housing 110. The first leaching mechanism includes a first material conveying mechanism 120 and a second material conveying mechanism 130 with a height difference.

[0046] The feeding end of the first feeding mechanism 120 forms a pre-leaching section 300 ; the middle part and the discharging end of the first feeding mechanism 120 form a first extraction leaching section 100 .

[0047] In one embodiment, the first material feeding mechanism 120 includes a first chain scraper assembly. The first chain scraper assembly includes a chain 132 and a scraper 132. A reinforcing rib 1311 is disposed on the back of the scraper 131 of the first chain scraper assembly. In one embodiment, a sealing plate 1312 for preventing material accumulation is disposed on the reinforcing rib 1311.

[0048] like Figure 4 , Figure 7 As shown, a first supporting screen plate assembly 140 is arranged below the upper chain scraper of the first chain scraper assembly for supporting materials and filtering solvents. The first supporting screen plate assembly 140 comprises a screen plate 141 and a supporting frame 142. The supporting frame 142 is arranged at the bottom of the screen plate 141.

[0049] Preferably, the sieve plate 141 includes a concave sieve plate 1411 and a horizontal sieve plate 1412. The horizontal sieve plates 1412 are arranged at both ends of the concave sieve plate 1411, and there is a smooth transition between the concave sieve plate 1411 and the horizontal sieve plate 1412, and the concave sieve plate 1411 forms a soaking area 600.

[0050] In one embodiment, the concave sieve plate 1411 includes a concave sieve plate 1 14111 and a concave sieve plate 2 14112. The number of the concave sieve plate 1 14111 is preferably 2. The number of the concave sieve plate 2 14112 is preferably 2.

[0051] The concave sieve plate 14111 is symmetrically arranged in the middle of the sieve plate 141.

[0052] The second concave sieve plate 14112 is symmetrically arranged at both ends of the sieve plate 141. The slope of the second concave sieve plate 14112 is greater than the slope of the first concave sieve plate 14111. Preferably, the slope of the second concave sieve plate 14112 is twice the slope of the first concave sieve plate 14111.

[0053] In one embodiment, no spray assembly is provided above the concave screen plate 2 14112 at the discharge end.

[0054] In one embodiment, the discharge end of the first feeding mechanism 120 is tilted upward. The first feeding mechanism can be made to tilt upward on the right according to various material conditions, that is, the material runs to the right front on the screen surface. Such an leaching operation mode can make the leaching and filtering effect better.

[0055] The second feeding mechanism 130 is located below the discharge end of the first feeding mechanism 120, and the feed end of the second feeding mechanism 130 overlaps with the discharge end of the first feeding mechanism 120; the second feeding mechanism 130 is connected to the first feeding mechanism 120 via the first transmission mechanism 160, and the first feeding mechanism 120 or the second feeding mechanism 130 is connected to the first driving mechanism 170.

[0056] The first transmission mechanism 160 includes a first transmission wheel 161, a first transmission chain 162, a second transmission wheel 163, a first transmission shaft 164, a conveying wheel 165, a transmission wheel 166, a second transmission chain 167, and a fourth transmission wheel 168. The external transmission chains are all equipped with independent first chain covers 190 to ensure safety.

[0057] The drive of the first extraction and leaching section adopts a one-to-two transmission. The feeding mechanisms in the first and second extraction and leaching sections respectively have a driving mechanism, and each driving mechanism drives two feeding mechanisms. The driving mechanism of the first extraction and leaching section drives the first feeding mechanism and the second feeding mechanism to achieve consistent linear speeds of the first feeding mechanism and the second feeding mechanism.

[0058] The second material feeding mechanism 130 includes a second chain scraper assembly, and the second chain scraper assembly is connected to the second chain scraper assembly via the first transmission mechanism 160. The second chain scraper assembly includes a chain and a scraper. A reinforcing rib is provided on the back of the scraper of the second chain scraper assembly. In one embodiment, an anti-accumulation sealing plate is provided on the reinforcing rib.

[0059] A second support screen assembly 150 is disposed below the upper chain scraper of the second chain scraper assembly for supporting materials and filtering solvents. The structure of the second support screen assembly 150 is the same as that of the first support screen assembly 140 .

[0060] In one embodiment, the discharge end of the second feeding mechanism 130 is tilted upward. The second feeding mechanism can be made to tilt upward on the right according to various material conditions, that is, the material runs to the right front on the screen surface. Such an leaching operation mode can make the leaching and filtering effect better.

[0061] In one embodiment, the first extraction and leaching section 100 further includes a first spray assembly 180 for spraying solvent on the materials on the first feeding mechanism and the second feeding mechanism. Preferably, the first oil bucket 112 is connected to the first spray assembly 180 to form a circulating spray structure.

[0062] The second extraction and leaching section 200 is located below the second extraction and leaching section 100. The second extraction and leaching section 200 includes a second shell 210. The second shell 210 is preferably in an inverted Z shape. A column support assembly 800 is arranged between the second shell 210 and the first shell 110. The column support assembly 800 includes a first column support 810, a second column support 820, and a third column support 830.

[0063] There are two first column supports 810, which are used to connect and support the left ends of the first and second shells. There are two second column supports 820, which are used to connect and support the middle parts of the first and second shells. There are two third column supports 8130, which are used to connect and support the right ends of the first and second shells.

[0064] The second shell 210 is provided with a discharge port 211, and the discharge port 211 and the feed port 111 are located on the same side; the discharge port is located at the lower left end of the second extraction and leaching section, and the feed port and the discharge port are in an upper and lower relationship and are at the same end, which is conducive to the upper and lower layer feeding of the material, and will not occupy too much site area when the leaching length is increased.

[0065] A second oil hopper 212 is disposed on the second shell 210 for collecting the solvent filtered by the sieve plate support assembly.

[0066] The top of the second housing 210 is equipped with several second installation square holes 213 to facilitate the installation of large parts. Each second installation square hole 213 has a standard second manhole 214 to facilitate personnel to enter and exit for maintenance. A second inspection hole 215 and a second sight glass 216 are correspondingly arranged above each second oil bucket 212 to facilitate observation of the interior. The second inspection hole 215 is preferably square.

[0067] The feeding end of the second housing 210 is connected to the discharging end of the first housing 110. The second leaching mechanism is installed in the second housing 210. The second leaching mechanism includes a third feeding mechanism 220 and a fourth feeding mechanism 230 with a height difference.

[0068] In one embodiment, the second extraction and leaching section 200 is located directly below the first extraction and leaching section 100; the first leaching mechanism and the second leaching mechanism are arranged in opposite directions of feeding.

[0069] In one embodiment, the third material feeding mechanism 220 includes a third chain scraper assembly. The third chain scraper assembly includes a chain and a scraper. A reinforcing rib is provided on the back of the scraper of the third chain scraper assembly. In one embodiment, a sealing plate to prevent material accumulation is provided on the reinforcing rib.

[0070] A third support screen plate assembly 240 is disposed below the upper chain scraper of the third chain scraper assembly for supporting materials and filtering solvents. The structure of the third support screen plate assembly 240 is the same as that of the first support screen plate assembly 140 .

[0071] In one embodiment, the discharge end of the third feeding mechanism 220 is tilted upward. The left part of the third feeding mechanism is tilted upward, that is, the material is running to the left front on the screen surface. Such a leaching operation mode can make the leaching and filtering effect better.

[0072] In one embodiment, the fourth feeding mechanism 230 is located below the discharge end of the third feeding mechanism 220, and the feed end of the fourth feeding mechanism 220 overlaps with the discharge end of the third feeding mechanism 230; the fourth feeding mechanism 230 is connected to the third feeding mechanism 220 via the second transmission mechanism 260, and the third feeding mechanism 220 or the fourth feeding mechanism 230 is connected to the second driving mechanism 270. The structure of the second transmission mechanism 260 is the same as that of the first transmission mechanism 160. The second transmission mechanism 260 includes a first transmission wheel, a first transmission chain, a second transmission wheel, a first transmission shaft, a conveying wheel, a transmission wheel, a second transmission chain 167, and a fourth transmission wheel. The external transmission chains are all equipped with a separate second chain cover 290 to ensure safety.

[0073] The second driving mechanism of the second extraction and leaching section drives the third feeding mechanism and the fourth feeding mechanism to achieve the consistency of the linear speed of the third feeding mechanism and the fourth feeding mechanism. The first driving mechanism and the second driving mechanism are preferably drive motors. The drive motors use variable frequency motors of the same power and model, so that when the equipment is working, the oil speed in the first and second extraction and leaching sections is ensured to be synchronized.

[0074] The fourth feeding mechanism 230 includes a fourth chain scraper assembly, which is connected to the third chain scraper assembly via the second transmission mechanism. The fourth chain scraper assembly includes a chain and a scraper. A reinforcing rib is provided on the back of the scraper of the fourth chain scraper assembly. In one embodiment, a sealing plate to prevent material accumulation is provided on the reinforcing rib.

[0075] A fourth support screen plate assembly 250 is disposed below the upper chain scraper of the fourth chain scraper assembly for supporting materials and filtering solvents. The structure of the fourth support screen plate assembly 250 is the same as that of the first support screen plate assembly 140 .

[0076] In one embodiment, the discharging end of the fourth feeding mechanism 230 is tilted upward. The left part of the fourth feeding mechanism is tilted upward, that is, the material is running to the left front on the screen surface. Such a leaching operation mode can make the leaching and filtering effect better.

[0077] The second extraction and leaching section 200 further includes a second spraying assembly 280 for spraying solvent on the materials on the third feeding mechanism and the fourth feeding mechanism. Preferably, the second oil bucket 212 is connected to the second spraying assembly 280 to form a circulating spraying structure.

[0078] The area where the fourth feeding mechanism 230 is located forms a draining section 400, which is used to drain the materials that have been processed by extraction and leaching. In one embodiment, a third spraying assembly 410 is provided on the draining section 400, which is used to spray fresh solvent on the materials in the draining section. A draining bucket 420 is provided at the bottom of the draining section 400, which is used to collect the solvent in the draining section. Only fresh solvent flushing is provided on the upper part of the oil in the draining section. When the oil falls from the third feeding mechanism to the draining conveying section, one or more fresh solvent flushings are provided at 1 / 3 of the conveying length of the draining section. After the fresh solvent flushing, no further flushing is performed, and the oil begins to drain.

[0079] The fourth feeding mechanism of the draining section is lifted upward as a whole, with a slope of 1:10. Except for draining at the concave filter plate, there is a tendency to move upward in the process of moving forward along the entire length of the draining section, which improves the draining effect as a whole.

[0080] The second shell 210 is connected to the discharge end of the first shell 110 via a chute 700, and the chute 700 is inclined. The material chute is inclined up and down, with the upper part inclined to the right and the lower part inclined to the left.

[0081] In one embodiment, a spray pipe 310 is provided on the discharge port of the slide pipe 700 to spray the solvent on the material passing through the slide pipe. The spray pipe is installed on the slide pipe, and the material can be sprayed before falling on the screen plate of the second extraction and leaching section. At this time, the material is sprayed in a loose state, which effectively improves the contact rate, not only ensures the leaching effect, but also improves the utilization rate of the solvent.

[0082] Specifically, the spray pipe 310 is located at the inner side of the discharge port of the chute away from the material. A spray pipe is installed on the left side of the lower part of the material chute, and above the spray pipe is the left enclosure of the chute. The left enclosure covers the spray pipe from the top to the bottom projection area. When the material of the first extraction and leaching section falls to the second extraction and leaching section through the chute, the material will not fall on the spray pipe and will not affect the spraying work.

[0083] The material is transported to the discharge end through the first feeding mechanism and falls onto the second feeding mechanism, realizing the first turning and loosening of the material; it is transported to the discharge end through the second feeding mechanism and falls onto the third feeding mechanism, realizing the second turning and loosening of the material; it is transported to the discharge end through the third feeding mechanism and falls onto the fourth feeding mechanism, realizing the third turning and loosening of the material; at the same time, the material is extracted and leached in the first and second extraction and leaching sections.

[0084] The multi-stage extraction and leaching device of the present invention comprises a first extraction and leaching section, a second extraction and leaching section and a material chute. The first extraction and leaching section comprises a pre-leaching section and a first leaching section, and the second extraction and leaching section comprises a second leaching section and a draining section.

[0085] The first extraction and leaching section comprises a first shell, a feed inlet, an upper conveying system, a first sieve plate support assembly, and a second sieve plate support assembly. The upper conveying system comprises a first conveying mechanism and a second conveying mechanism.

[0086] The second extraction and leaching section comprises a second shell, a material outlet, a lower conveying system, a third sieve plate support assembly, and a fourth sieve plate support assembly. The lower conveying system comprises a third material conveying mechanism and a fourth material conveying mechanism.

[0087] The upper conveying system of the first extraction and leaching section is inside the first shell. The left end of the first feeding mechanism of the upper conveying system is below the feed port of the first extraction and leaching section. A first sieve plate is installed below the first feeding mechanism so that the material can fall directly on the first sieve plate. The first feeding mechanism is installed horizontally. The left and right shafts of the first feeding mechanism are respectively strung in the mounting holes of the front and rear wall panels of the first shell. There are bearing supports at both ends of the shaft to ensure the rotation of the shaft. A mechanical sealing device is installed in the wall panel mounting hole to ensure the sealing between the shaft and the shell. An even number of sprockets are installed on the shaft, and the chain is wrapped around the sprockets on the left and right shafts as a complete ring.

[0088] An anti-accumulation scraper is welded on the sprocket. When running, the scraper pushes the material forward inside the material. At this time, the material is easy to accumulate at the angle of the scraper. The pushing surface of the scraper structure is a flat plate, and there are reinforcing ribs on the back of the scraper. A thin sealing plate is covered on the outside of the reinforcing ribs to ensure that the back of the scraper is an inclined transition surface, so that the phenomenon of material accumulation at the scraper angle will not occur.

[0089] The screen plate is installed horizontally to ensure that the material and chain scraper run smoothly on the screen plate surface.

[0090] The second feeding mechanism is at the lower right of the first feeding mechanism, and the right end shaft of the first feeding mechanism is above the left end of the second feeding mechanism, ensuring that the material above the first sieve plate can fall onto the sieve plate at the left end of the second feeding mechanism when the material is pushed out to the rightmost end of the first feeding mechanism by the scraper of the first feeding mechanism. The first and second feeding mechanisms of the first extraction and leaching section are arranged one above and one below, one left and one right. The first feeding mechanism and the second feeding mechanism are in a step-like shape, separated from each other and partially overlapped. The material on the first sieve plate is pushed forward by the scraper, and the solvent above the material is continuously sprayed, and the material begins to be squeezed inside. At this time, at the end of the first feeding mechanism, the material is turned over once, and the material is loosely reorganized once, avoiding the impact of material compaction on the penetration rate.

[0091] The material is pushed forward again by the chain scraper on the second screen plate. The chain scrapers on the first screen plate support assembly and the second screen plate support assembly run in the same direction. At the same time, the spray assembly above the second feeding mechanism sprays continuously. After passing through a leaching section, the material will begin to be compacted again. When it reaches the rightmost end of the second feeding mechanism, the leaching process of the material in the first extraction leaching section is completed, and then it will fall into the second extraction leaching section to continue leaching.

[0092] A material chute is installed at the lower right side of the first extraction and leaching section, and the lower end of the chute is connected to the upper shell of the right end of the second extraction and leaching section, so that the first and second extraction and leaching sections are connected. The chute has a certain inclination angle to ensure that the material will not vertically impact the third screen plate support assembly of the second extraction and leaching section, thereby protecting the screen plate.

[0093] The material on the second screen plate support assembly falls onto the third screen plate support assembly through the slide pipe, achieving a second overturning and reorganization. Each time the material is overturned and reorganized, the gap inside the material will become relatively loose again, and a good penetration and leaching effect will be obtained.

[0094] When the material reaches above the third sieve plate supporting assembly of the second extraction and leaching section, the scraper chain on the third feeding mechanism of the lower conveying system pushes the material in the opposite direction to the material of the first extraction and leaching section. The material is flipped from the left end of the third feeding mechanism to the fourth feeding mechanism and falls to the right end of the fourth sieve plate, just like the feeding relationship between the first feeding mechanism and the second feeding mechanism. The material is flipped and loosened and reorganized every time the material is fed between two conveying devices, which effectively solves the problem of compaction of the material during the leaching process, thereby improving the leaching effect.

[0095] The chain scrapers on the third sieve plate support assembly and the fourth sieve plate support assembly run in the same direction, but opposite to the chain scrapers on the first sieve plate support assembly and the second sieve plate support assembly in the first extraction and leaching section. The fourth feeding mechanism pushes the material toward the discharge port.

[0096] The first and second extraction and leaching sections each include a conveying system, and each conveying system is driven separately. Due to the separate drive, the load it receives is reduced by 50%. The load reduction at low speed increases the safety factor of the drive, and the selection of the drive device is relatively simple. Each conveying system is composed of two independent devices. The two independent conveying devices are driven by two sprockets outside the shell. The two sprockets are respectively installed on the shaft ends of the conveying device on the same side of the shell. The large sprockets on the first feeding mechanism and the third feeding mechanism are respectively driven to rotate by the small sprockets on the chain and the driving mechanism. Each individual conveying device moves independently and at the same speed, which not only ensures the synchronization of the material, but also reduces the load requirements of the conveying device.

[0097] The first sieve plate support assembly, the second sieve plate support assembly, the third sieve plate support assembly and the fourth sieve plate support assembly in the first and second extraction and leaching sections are respectively located below the corresponding first feeding mechanism, the second feeding mechanism, the third feeding mechanism and the fourth feeding mechanism. The chain scraper of the feeding mechanism is a full-loop chain. The upper chain scraper of the feeding mechanism is on the screen surface, and the chain scrapers at both ends embrace the sprockets at both ends. The lower chain scraper falls on the corresponding support. The upper surface of the support has a symmetrical oblique track. When the chain scraper travels on it, the lower end surface of the chain scraper along the width direction of the equipment can contact the symmetrical oblique track, thereby avoiding contact and wear between the scraper and the guide rail at the same position.

[0098] The multi-stage material turning structure is more adaptable to materials with higher powder content and materials with poor processing quality in the pre-leaching process. At the same time, since the load-bearing capacity of the structural monomer is relatively small, the maintenance of the equipment is greatly reduced.

[0099] The first and second extraction and leaching sections are driven separately, the first extraction and leaching section is driven by the first drive, and the second extraction and leaching section is driven by the second drive. At the same time, the same drive parameters ensure the drive consistency, so that the walking speed of the upper and lower layers of materials is synchronized. The separate drive structure avoids one drive having to drive the entire material in the extractor, which increases the overall drive selection.

[0100] In the first and second extraction and leaching sections, the first extraction and leaching section on the first feeding mechanism and the second feeding mechanism, the second extraction and leaching section on the third feeding mechanism and the draining section on the fourth feeding mechanism, the middle parts of the sieve plate support components of the first, second extraction and leaching sections and the draining section are respectively made into a concave structure of the filtering surface, that is, the first, second extraction and leaching sections and the draining section are horizontally concave in the middle at both ends. Since the filter sieve plate is a shallow concave surface, the sieve surface is a concave structure, and the surface of the oil 610 on the concave sieve surface is also concave. A large number of solvent spraying components are arranged on the upper part of the material layer length L1. The slope of the sieve plate at the L1 section is set to 1:32. The top of the concave surface of the oil forms a concentrated solvent 620, and a soaking area 500 is formed within the L1 length of the concave surface. In this way, the extraction process is more conducive to the solvent spraying + soaking process.

[0101] After the oil 610 has traveled the length L1, it continues to move forward and upward. No spraying is arranged on the upper part of the length L2 of this forward and upward movement. The upward slope of the sieve plate at this L2 section is set to 1:16. Under the premise of no spraying, the solvent on the surface of the oil is drained better due to its own gravity and because the oil moves forward and has a tendency to move upward, the concave filter sieve plate and the horizontal filter sieve plates at both ends have a smooth transition. Therefore, while ensuring that the material with a high powder content can be soaked, the mechanical movement difficulty of the conveying is not increased.

[0102] The concave filtering structure is arranged in each feeding mechanism section. If there are several feeding sections for leaching, there will be several concave filtering structures, and the oil will be sprayed, soaked and drained several times continuously. Such continuous and repeated leaching increases the leaching efficiency.

[0103] In the last conveying section, which is a completely draining section, only fresh solvent flushing is set on the upper part of the oil in the draining section. When the oil falls from the third feeding mechanism to the draining conveying section, one or several fresh solvent flushings are set at 1 / 3 of the conveying length of the draining section. After the fresh solvent flushing, no further flushing is performed and the oil begins to drain.

[0104] An inner concave filter plate structure is also provided in the conveying device of the draining section. When the oil starts to move forward and downward, fresh solvent is flushed, and then the oil continues to move forward along the concave shape. When it moves to the bottom of the concave shape and starts to move upward, the speed at which the solvent separates from the oil is increased.

[0105] During the entire leaching process, the oil always maintains the movement form of "translation-downward-upward-translation-flipping" for many times, and the solvent in the leaching and extraction section leaches the oil in the form of "spraying-immersing-draining-spraying" for many times. This leaching method improves the leaching effect, optimizes the residual oil index, reduces the solubility content of wet meal, and ensures that the subsequent process DTDC can reduce the use of steam.

[0106] Since the extraction and leaching section works in coordination with the upstream and downstream, the front section of the extractor feeds the material into the extractor, and the oil in the extractor is sent to the downstream section. If a temporary failure occurs in the front section or the downstream section, the first and second extraction and leaching sections can also achieve fine-tuning differential operation.

[0107] Compared with the existing mechanism, the present invention has the following advantages: 1. Independent feeding mechanism, which reduces the maintenance required for the conveying device itself; 2. Independent feeding mechanism maintains synchronous conveying speed; 3. Able to loosen materials multiple times to avoid material compaction; 4. It improves the solvent penetration rate, increases the contact between the solvent and the material, and improves the leaching efficiency.

[0108] 5. The feeding between each pair of feeding mechanisms is from top to bottom, which will not increase the power and save energy and reduce consumption.

[0109] 6. The scraper is a fully sealed structure, which will not cause material accumulation at the angle.

[0110] 7. Each leaching section has a concave leaching structure, forming multiple "immersion + draining" to improve leaching efficiency; 8. Separate drive not only maintains the same speed, but also reduces the load on the drive and reduces maintenance costs.

[0111] Example 2 The multi-stage extraction and leaching method is implemented by using the multi-stage extraction and leaching device of any one of the embodiments 1, and the process comprises the following steps: Pre-leaching: the material is pre-leached at the discharge end of the first feeding mechanism; Primary extraction and leaching: The first feeding mechanism transports the material and continuously sprays the solvent on the material at the same time. The material is squeezed inside and transported to the discharge end of the first feeding mechanism and falls to the second feeding mechanism. The material is turned over, loosened, and reorganized. The second feeding mechanism continues to transport the material and continuously sprays the solvent on the material. The material is compacted. When it reaches the discharge end of the second feeding mechanism, the leaching process of the material in the first extraction and leaching section ends. Secondary extraction and leaching: the material falls into the second extraction and leaching section, where it is turned over, loosened, and reorganized three times. The material continues to be leached, and the third feeding mechanism transports the material. At the same time, the solvent is continuously sprayed on the material. The material is squeezed inside and transported to the discharge end of the third feeding mechanism, and falls to the fourth feeding mechanism. The material is turned over, loosened, and reorganized four times. Draining: The fourth feeding mechanism continues to transport the material and continuously sprays fresh solvent on the material. The material is compacted and drained before being discharged.

[0112] The multi-stage extraction and leaching process is divided into different working areas, namely pre-leaching, extraction and leaching (first extraction and leaching, second extraction and leaching), and draining. The pre-leaching area is from the feed inlet to the forward section, and the spray assembly performs large-flow spraying. The first screen plate support assembly includes a part of pre-leaching and a part of leaching. The pre-leaching is in the left half of the first screen plate support assembly, and the leaching is in the right half of the first screen plate support assembly. When the material continues to move forward into the leaching area, the spray system performs cyclic spraying on the material in this area. The leaching area includes the first extraction and leaching section and the right area of ​​the second extraction and leaching section, that is, the second screen plate support assembly and the third screen plate support assembly. The material is turned over many times in the leaching area to completely loosen and reorganize the material. The fourth screen plate support assembly is the draining section, which is only used for fresh solvent to flush the material, and then drain naturally after flushing. Since the draining area and the lower draining bucket are independent structures, a forced draining system can be equipped to reduce the solubility of wet meal.

Claims

1. A multi-stage extraction and leaching device, characterized in that: include: A first extraction and leaching section includes a first shell and a first leaching mechanism disposed in the first shell; The first leaching mechanism comprises a first material conveying mechanism and a second material conveying mechanism having a height difference; A second extraction and leaching section is located below the first extraction and leaching section, the second extraction and leaching section comprises a second shell, and a second leaching mechanism arranged in the second shell, the feed end of the second shell is connected to the discharge end of the first shell, and the second leaching mechanism comprises a third feeding mechanism and a fourth feeding mechanism with a height difference; The material is transported to the discharge end through the first feeding mechanism and falls onto the second feeding mechanism, thereby realizing the first turning and loosening of the material; the material is transported to the discharge end through the second feeding mechanism and falls onto the third feeding mechanism, thereby realizing the second turning and loosening of the material; the material is transported to the discharge end through the third feeding mechanism and falls onto the fourth feeding mechanism, thereby realizing the third turning and loosening of the material; at the same time, the material is extracted and leached in the first and second extraction and leaching sections.

2. The multi-stage extraction and leaching device according to claim 1 is characterized in that: The second extraction and leaching section is located directly below the first extraction and leaching section; The first leaching mechanism and the second leaching mechanism are arranged in opposite directions of feeding.

3. The multi-stage extraction and leaching device according to claim 1 is characterized in that: The second feeding mechanism is located below the discharge end of the first feeding mechanism, and the feed end of the second feeding mechanism overlaps with the discharge end of the first feeding mechanism; the second feeding mechanism is connected to the first feeding mechanism via the first transmission mechanism, and the first feeding mechanism or the second feeding mechanism is connected to the first driving mechanism.

4. The multi-stage extraction and leaching device according to claim 3 is characterized in that: The first feeding mechanism comprises a first chain scraper assembly; a first supporting screen assembly is arranged below the upper chain scraper of the first chain scraper assembly, for supporting materials and filtering solvents; The second feeding mechanism includes a second chain scraper assembly, and the second chain scraper assembly is connected to the second chain scraper assembly via a first transmission mechanism; A second supporting screen plate assembly is arranged below the upper chain scraper of the second chain scraper assembly for supporting materials and filtering solvents.

5. The multi-stage extraction and leaching device according to claim 4 is characterized in that: The fourth feeding mechanism is located below the discharge end of the third feeding mechanism, and the feed end of the fourth feeding mechanism overlaps with the discharge end of the third feeding mechanism; the fourth feeding mechanism is connected to the third feeding mechanism via the second transmission mechanism, and the third feeding mechanism or the fourth feeding mechanism is connected to the second driving mechanism.

6. The multi-stage extraction and leaching device according to claim 5 is characterized in that: The third feeding mechanism includes a third chain scraper assembly; a third supporting screen assembly is arranged below the upper chain scraper of the third chain scraper assembly, for supporting materials and filtering solvents; The fourth feeding mechanism comprises a fourth chain scraper assembly, and the fourth chain scraper assembly is connected to the third chain scraper assembly via a second transmission assembly; A fourth supporting screen plate assembly is arranged below the upper chain scraper of the fourth chain scraper assembly for supporting materials and filtering solvents.

7. The multi-stage extraction and leaching device according to claim 1 is characterized in that: The first extraction and leaching section further comprises a first spraying assembly for spraying solvent on the materials on the first feeding mechanism and the second feeding mechanism; The second extraction and leaching section also includes a second spraying assembly for spraying solvent on the materials on the third feeding mechanism and the fourth feeding mechanism.

8. The multi-stage extraction and leaching device according to claim 7 is characterized in that: A feed port is provided on the first shell; a first oil hopper is provided on the first shell for collecting the solvent filtered by the sieve plate support assembly; the first oil hopper is connected to the first spray assembly to form a circulating spray structure; A discharge port is arranged on the second shell, and the discharge port and the feed port are located on the same side; a second oil hopper is arranged on the second shell for collecting the solvent filtered by the sieve plate support assembly; the second oil hopper is connected to the second spray assembly to form a circulating spray structure.

9. The multi-stage extraction and leaching device according to claim 1, characterized in that: The area where the fourth feeding mechanism is located forms a draining section, which is used to drain the material after the extraction and leaching treatment; The draining section is provided with a third spraying assembly for spraying fresh solvent on the material in the draining section; the third spraying assembly is located at the feed end of the draining section and at 1 / 3 of the length of the fourth feeding mechanism; A drain bucket is arranged at the bottom of the drain section for collecting the solvent in the drain section.

10. The multi-stage extraction and leaching device according to claim 1, characterized in that: The second shell is connected to the discharge end of the first shell via a slide pipe, and the slide pipe is arranged obliquely; A spray pipe is arranged on the discharge port of the chute for spraying solvent on the material passing through the chute.

11. The multi-stage extraction and leaching device according to claim 10, characterized in that: The spray pipe is located at the inner side of the discharge port of the chute away from the material.

12. The multi-stage extraction and leaching device according to claim 1, characterized in that: The first shell is in a Z shape, and the second shell is in a reverse Z shape; A column support assembly is arranged between the second shell and the first shell.

13. The multi-stage extraction and leaching device according to claim 1, characterized in that: The discharge ends of the first feeding mechanism, the second feeding mechanism, the third feeding mechanism and the fourth feeding mechanism are all arranged to tilt upwards; The slope of the fourth feeding mechanism is 1:

10.

14. The multi-stage extraction and leaching device according to claim 6, characterized in that: The first, second, third and fourth supporting screen plate assemblies include screen plates and supporting frames, and the supporting frames are arranged at the bottom of the screen plates; The sieve plate comprises a concave sieve plate and horizontal sieve plates at both ends of the concave sieve plate. The concave sieve plate and the horizontal sieve plate have a smooth transition, and the concave sieve plate forms a soaking area.

15. The multi-stage extraction and leaching device according to claim 14, characterized in that: The concave sieve plate comprises: A first concave sieve plate is symmetrically arranged in the middle of the concave sieve plate; The second concave sieve plate is symmetrically arranged at two ends of the concave sieve plate, and the inclination of the second concave sieve plate is greater than the inclination of the first concave sieve plate.

16. The multi-stage extraction and leaching device according to claim 15, characterized in that: The slope of the second concave sieve plate is twice the slope of the first concave sieve plate.

17. The multi-stage extraction and leaching device according to claim 16, characterized in that: No spray assembly is arranged above the second concave sieve plate at the discharge end.

18. The multi-stage extraction and leaching device according to claim 1, characterized in that: The feeding end of the first feeding mechanism forms a pre-leaching section; the middle part and the discharging end of the first feeding mechanism form an extraction leaching section.

19. The multi-stage extraction and leaching device according to claim 6, characterized in that: Reinforcing ribs are arranged on the backs of the scrapers of the first, second, third and fourth chain scraper assemblies, and anti-material accumulation sealing plates are arranged on the reinforcing ribs.

20. A multi-stage extraction and leaching process, characterized in that: The process is realized by using the multi-stage extraction and leaching device according to any one of claims 1 to 19. The method comprises the following steps: Pre-leaching: the material is pre-leached at the discharge end of the first feeding mechanism; Primary extraction and leaching: The first feeding mechanism transports the material and continuously sprays the solvent on the material at the same time. The material is squeezed inside and transported to the discharge end of the first feeding mechanism and falls to the second feeding mechanism. The material is turned over, loosened, and reorganized. The second feeding mechanism continues to transport the material and continuously sprays the solvent on the material. The material is compacted. When it reaches the discharge end of the second feeding mechanism, the leaching process of the material in the first extraction and leaching section ends. Secondary extraction and leaching: the material falls into the second extraction and leaching section, where it is turned over, loosened, and reorganized three times. The material continues to be leached, and the third feeding mechanism transports the material. At the same time, the solvent is continuously sprayed on the material. The material is squeezed inside and transported to the discharge end of the third feeding mechanism, and falls to the fourth feeding mechanism. The material is turned over, loosened, and reorganized four times. Draining: The fourth feeding mechanism continues to transport the material and continuously sprays fresh solvent on the material. The material is compacted and drained before being discharged.

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