Intermeshing flighted dipper and method of extraction thereof

Abstract

The present application relates to a kind of staggered scraper type infuser and its extraction method, box is equipped with multiple mutually parallel longitudinal partitions, each longitudinal partition separates the width direction of box into multiple immersion pools side by side and in series;Each immersion pool is respectively provided with inclined bottom wall, the inclined direction of the inclined bottom wall of adjacent immersion pool is opposite, annular chain scraping mechanism is respectively arranged in each immersion pool, and the upper of first-stage immersion pool is provided with temporary storage feeding device. The upper of each inclined bottom wall is respectively provided with chain partition, each chain partition is respectively parallel with the inclined bottom wall below, the upper layer of chain scraping mechanism is down along the corresponding chain partition, and the lower layer of chain scraping mechanism is pulled out from the pool bottom of corresponding immersion pool and is pushed up along the inclined bottom wall. Fresh solvent enters the space below from the slot of last-stage chain partition, and after turning from bottom, it goes up along the chain partition to the upper level overflow;The advancing direction of material is opposite to solvent, to realize full countercurrent immersion type extraction.

Description

TECHNICAL FIELD

[0001] The present application relates to an extraction device, in particular to a staggered scraper type leaching device, and an extraction method of the staggered scraper type leaching device, and belongs to the technical field of solvent extraction. BACKGROUND

[0002] Oil-containing waste clay is a waste produced in the oil refining process. Taking palm oil refining as an example, during the oil decolorization process, 1.0-2.0 kg of activated clay is usually added per ton of vegetable oil to adsorb pigment particles, gum, soap particles and other impurities. After the decolorization process is completed, the clay is filtered by a leaf filter to form a filter cake, and the oil-containing filter cake is blown by compressed air (or saturated steam) to obtain waste clay containing 20-40% oil. If the waste clay is not properly stored and treated, it will spontaneously combust, quickly rancid when exposed to the atmosphere, and produce irritating odors, separate dirty oil, and cause pollution, resulting in high storage and treatment costs of the waste clay. Direct landfill will pollute the landfill area and cause secondary hazards such as pollution of groundwater. With the improvement of environmental awareness in various countries and the requirement of sustainable development, it is inevitable and necessary for large oil refining enterprises to treat waste clay harmlessly.

[0003] The most effective means of treating waste clay at present is extraction. The acid oil extracted can be used industrially or processed into biodiesel. The main components of the clay are alumina and silicon oxide, and after desolventization to recover the solvent, the clay can be used as a building brick material.

[0004] Under the influence of different moisture and pressure, the properties of waste clay are unstable, sometimes solid and sometimes nearly paste. There are many types of extraction equipment on the market, and the general principle is that the solid naturally accumulates into a stable bed or is forced to form a stable bed. The extraction liquid or washing liquid is poured from above the bed, and the liquid penetrates the bed to complete the mass transfer process. Such equipment has requirements for the particle size of solid waste clay. When the powder content of solid waste clay is too large, the void ratio of the bed is insufficient, and when the void ratio is less than 5%, the penetration rate will decrease or not penetrate.

[0005] The Chinese invention patent with the publication number CN 216755454U discloses a flat-bottom immersion type scraper plate leaching device. The inner cavity of the box is provided with an annular chain, and scraper plates are uniformly and intervaliy installed on the annular chain. The scraper plates extend transversely along the box. The box is provided with a horizontal bottom wall. The upper part of the head end of the box is provided with a driving shaft, and a driving sprocket is installed on the driving shaft. The lower part of the head end of the box is provided with a head end driven shaft, and a head end driven sprocket is installed on the head end driven shaft. The lower part of the tail end of the box is provided with a tail end driven shaft, and a tail end driven sprocket is installed on the tail end driven shaft. The annular chain is sequentially wound around the driving sprocket, the head end driven sprocket and the tail end driven sprocket to form a triangle including a vertical segment, a horizontal segment and an inclined segment. The bottom of the box stores extraction liquid to form an immersion pool, and the horizontal segment is entirely immersed in the immersion pool. The capacity of the leaching device of this structure type is not high, and it has not been applied to large and super-large leaching production lines.

[0006] The Chinese invention patent with the publication number CN 216755456U discloses a parallel scraper plate leaching device. The inner cavity of the box is provided with an annular chain, and scraper plates are uniformly and intervaliy installed on the annular chain. The scraper plates extend transversely along the box. The box is provided with an inclined bottom wall with a high head end and a low tail end. The upper part of the head end of the box is provided with a driving shaft, and a driving sprocket is installed on the driving shaft. The upper part of the tail end of the box is provided with a tensioning shaft, and a tensioning sprocket is installed on the tensioning shaft. The lower part of the tail end of the box is provided with a driven shaft, and a driven sprocket is installed on the driven shaft. The annular chain is sequentially wound around the driving sprocket, the tensioning sprocket and the driven sprocket to form a triangle including a horizontal segment, a vertical segment and an inclined segment. The inclined segment is parallel to the inclined bottom wall of the box. The bottom of the box stores extraction liquid to form an immersion pool, and the lower part of the inclined segment is immersed in the immersion pool. The leaching device adopts a V-shaped groove and is suitable for extracting powdery fibrous materials. The extraction efficiency is extremely high for powdery materials. However, the capacity of the leaching device of this structure type is not high, and it is not suitable for large and super-large leaching production lines. SUMMARY

[0007] The purpose of the present application is to overcome the problems existing in the prior art and provide an interleaved scraper plate type leaching device. The flow channel is reasonably arranged, full countercurrent immersion type extraction can be realized, the extraction power is maintained large throughout the process, the operation is stable and reliable, and it is suitable for large-scale extraction of oil-containing waste clay.

[0008] To solve the above technical problems, the interleaved scraper plate type leaching device of the present application comprises a box. The box is provided with multiple longitudinal partitions extending along the length direction of the box and parallel to each other. Each longitudinal partition separates the width direction of the box into multiple immersion pools arranged side by side and connected in series. Each immersion pool is provided with an inclined bottom wall. The inclined directions of the inclined bottom walls of adjacent immersion pools are opposite. Each immersion pool is provided with an annular chain scraper mechanism. The upper part of the first-stage immersion pool is provided with a temporary storage feeding device.

[0009] Further, the upper end of each inclined bottom wall is provided with a horizontal chute for guiding the material to the lower end of the next-stage soaking pool.

[0010] Further, the upper end of each inclined bottom wall is provided with a horizontal chute for guiding the material to the lower end of the next-stage soaking pool.

[0011] Further, the upper end of each inclined bottom wall is provided with a horizontal chute for guiding the material to the lower end of the next-stage soaking pool.

[0012] Further, the angle between the bottom wall of the horizontal main chute and the horizontal plane is greater than 60°, and the angle between the inclined bottom wall and the horizontal plane is less than 15°.

[0013] Further, the middle section of the adjacent longitudinal partition is provided with a stage-to-stage overflow port for overflowing to the next-stage soaking pool, and each stage-to-stage overflow port is located above the current-stage chain partition and below the next-stage chain partition.

[0014] Further, the stage-to-stage overflow ports of the adjacent stages are staggered in the length direction of the soaking pool.

[0015] Further, the upper part of the chain partition in the last-stage soaking pool is provided with a fresh solvent inlet, and the part above the liquid level of the last-stage chain partition is provided with a slot for allowing the solvent to pass through; the side of the lowest end of the first-stage soaking pool is provided with a concentrated solvent outlet.

[0016] Further, the fresh solvent first falls on the upper part of the chain partition of the last-stage soaking pool, flows downward and to the right, and then falls from the slot like a waterfall, enters the soaking space between the last-stage chain partition and the inclined bottom wall, and flows downward and to the right, thereby washing and extracting the powder that moves in the opposite direction; after reaching the bottom of the last-stage soaking pool, the solvent bypasses the lower edge of the chain partition and enters the upper part of the chain partition, and then flows upward and to the left.

[0017] The extraction liquid enters the lower part of the chain partition of the next-stage soaking pool from the stage-to-stage overflow port of the last stage, enters the soaking space between the chain partition and the inclined bottom wall of the stage, and flows downward and to the left, thereby extracting the powder that moves in the opposite direction; after reaching the bottom of the soaking pool of the stage, the solvent bypasses the lower edge of the chain partition and enters the upper part of the chain partition, and then flows upward and to the right.

[0018] The extraction liquid from the interstage overflow port of the stage enters the lower part of the chain partition of the soaking tank of the next stage, enters the soaking space between the chain partition and the inclined bottom wall of the soaking tank of the stage, and flows downward to the right to extract the powder material moving in the opposite direction. When the solvent reaches the bottom of the soaking tank of the stage, it bypasses the lower edge of the chain partition to enter the upper part of the chain partition, and then flows upward to the left. Then the extraction liquid enters the next stage from the interstage overflow port, and the process is repeated.

[0019] Further, the outer side of the last-stage soaking tank is further provided with a first-stage draining tank. The longitudinal partition between the last-stage soaking tank and the draining tank is a closed structure below the liquid surface. The upper end of the inclined bottom wall of the draining tank is provided with a chute connected with the material outlet.

[0020] Further, the chain scraping mechanism comprises a scraping chain and a scraper uniformly fixed on the scraping chain. The upper end of each group of scraping chains is wound around a head wheel above the liquid surface. The lower end of each group of scraping chains is wound around a tail wheel and immersed in the extraction liquid. The head wheels at the same end of the extractor are fixed on corresponding driving long shafts. The shaft ends of the two driving long shafts are respectively provided with main driving wheels. The two main driving wheels are respectively driven by respective scraping driving mechanisms.

[0021] Further, each tail wheel is fixed in the middle of a respective driven short shaft. The two ends of each driven short shaft are respectively supported on the bottom of the longitudinal partition of the adjacent soaking tank through bearings.

[0022] Further, the shaft end of the driven short shaft is supported in a sliding bearing. The sliding bearing is embedded in a driven bearing seat. The outer end of the driven bearing seat is covered with a sealing blind cover. The driven bearing seat is sealingly fixed at the central hole of a driven shaft end plate. The driven shaft end plate is sealingly fixed on the corresponding longitudinal partition.

[0023] Further, the temporary storage feeding device comprises a temporary storage hopper. The temporary storage hopper is tapered in the length and width directions, with the upper end being narrow and the lower end being wide. The lower end of the temporary storage hopper is provided with a feeding valve. The feeding valve comprises:

[0024] Impeller shafts, which are parallel to each other and extend along the length direction of the feeding valve;

[0025] Feeding blades, which are radially and uniformly distributed on the outer periphery of the impeller shafts, are located in the inner cavity of the valve body and extend along the length direction of the impeller shafts. The outer edges of each feeding blade respectively point to the outer wall of the adjacent impeller shaft. The feeding blades on the adjacent impeller shafts are cross-embedded and have a phase difference of half the included angle between the coaxial adjacent feeding blades.

[0026] Valve body, the upper and lower ends of which are rectangular. The length direction is provided with an arc-shaped side wall matched with the revolution circumference of the feeding blades.

[0027] Synchronous gears are installed on the same side of the shaft ends of the two impeller shafts and mesh with each other, so that the two impeller shafts rotate reversely and synchronously.

[0028] A driving wheel is installed on the other side of the shaft end of one of the impeller shafts,

[0029] A feeding speed reduction mechanism, the input end of which is driven by a feeding motor, and the output end of which drives the driving wheel through a chain or a synchronous belt.

[0030] Another object of the present application is to overcome the problems in the prior art and provide an extraction method of the staggered scraper type extractor, the flow channel of which is reasonably arranged, full countercurrent soaking type extraction can be realized, a large extraction power is maintained throughout the process, the operation is stable and reliable, and the method is suitable for large-scale extraction of oil-containing waste white clay.

[0031] To solve the above technical problems, the extraction method of the staggered scraper type extractor of the present application adopts the staggered scraper type extractor according to claim 8, and sequentially includes the following steps:

[0032] A1, the fresh solvent first falls on the upper part of the chain partition of the last-stage soaking pool, flows downward and to the right, fills the full width of the chain partition, and then falls like a waterfall from the gap, enters the soaking space between the last-stage chain partition and the inclined bottom wall, and flows downward and to the right, washing and extracting the powder that advances reversely, and after the solvent reaches the bottom of the last-stage soaking pool, bypasses the lower edge of the chain partition, enters the upper part of the chain partition, and flows upward and to the left;

[0033] A2, the extraction liquid enters the lower part of the chain partition of the upper-stage soaking pool from the inter-stage overflow port of the last stage, enters the soaking space between the chain partition and the inclined bottom wall of the stage, and flows downward and to the left, extracting the powder that advances reversely, and after the solvent reaches the bottom of the soaking pool of the stage, bypasses the lower edge of the chain partition, enters the upper part of the chain partition, and flows upward and to the right;

[0034] A3, the extraction liquid enters the lower part of the chain partition of the upper-stage soaking pool from the inter-stage overflow port of the stage, enters the soaking space between the chain partition and the inclined bottom wall of the stage, and flows downward and to the right, extracting the powder that advances reversely, and after the solvent reaches the bottom of the soaking pool of the stage, bypasses the lower edge of the chain partition, enters the upper part of the chain partition, and flows upward and to the left;

[0035] A4, the extraction liquid enters the soaking space between the chain partition and the inclined bottom wall of the upper-stage from the inter-stage overflow port, and the process is repeated in sequence.

[0036] A5, after the extraction liquid reaches the bottom of the first-stage soaking pool, bypasses the lower edge of the chain partition, and flows out from the concentrated solvent outlet upward.

[0037] Further, the temporary feeding device feeds new material into the first soaking pool and onto the chain partition, and the scraper pushes the material downward and to the right to be submerged below the liquid level, turns at the bottom of the first soaking pool, moves upward and to the left in the soaking space between the chain partition and the inclined bottom wall, and extracts, and continues to move upward and to the left and to be drained after gradually drying out of the liquid level;

[0038] The material drained in the first stage is slid laterally from the upper part of the first inclined bottom wall into the low end of the second soaking pool, moves upward and to the right in the soaking space between the chain partition and the inclined bottom wall of the stage, extracts, and continues to move upward and to the right and to be drained after gradually drying out of the liquid level, and is slid laterally from the upper part of the inclined bottom wall into the low end of the third soaking pool, and so on.

[0039] The material at the upper end of the inclined bottom wall of the last soaking pool falls into the low end of the draining pool, climbs along the inclined bottom wall of the draining pool and is finally drained, and is discharged through the discharge chute to the material outlet.

[0040] Compared with the prior art, the present application has the following beneficial effects: 1. The temporary feeding device solves the need for temporary storage of material before soaking, providing a guarantee for continuous and stable feeding; the use of a double-impeller structure increases the inlet width, effectively improving the passability of the upper inverted-cone temporary storage hopper, and eliminating arching and bridging; after the lower end of the temporary storage hopper is widened, its effective volume increases significantly, and the buffer space becomes larger, which can meet the needs of continuous and stable feeding.

[0041] 2. The relative positions of the double impellers are determined by synchronous gears, and a fixed phase difference is maintained between the two impellers, producing a similar meshing opposite rotation, and the blades on the shafts of the two impellers function to clean each other, preventing material from accumulating at the roots of the blades; the use of a positive displacement impeller accurately controls the feeding amount, preventing blockage caused by excessive feeding; the open structure at both ends of the impeller avoids the formation of a gap between the impeller and the valve body; the impeller does little work on the material, consumes less power, and has low operating costs.

[0042] 3. The temporary feeding device has a compact structure and good functionality, the feeding valve is a modular structure that can be used immediately after insertion, and is convenient and fast; it is suitable for batch manufacturing, and compared with a screw-type feeding device, the manufacturing cost is reduced by 30%.

[0043] 4. The material is soaked in the solvent to achieve soaking, and the mutual solubility of solute and solvent is used for extraction, and the multiple X-crossing soaking pools effectively compress the lengthwise dimension, allowing the main size of the equipment to be appropriately expanded in the width direction, greatly shortening the length of the equipment. The scraper chains are arranged in a positive-negative manner in the width direction of the leaching device, the main size of the equipment is appropriately expanded in the width direction, greatly shortening the total length of the multi-stage extraction equipment; the effective soaking path is lengthened, the surface area of the equipment is reduced, and materials are saved.

[0044] 5. All stages are fully immersion extraction tanks, which are more suitable for the extraction of powdered materials than rinsing extraction tanks. The mass transfer efficiency during the extraction process is significantly improved, with the mass transfer efficiency of full immersion extraction being 300-400% higher than that of traditional rinsing extraction. Compared to rinsing extraction which requires 90-120 minutes, immersion extraction only needs 30 minutes to reach or exceed its mass transfer level.

[0045] 6. The scraper chain's head pulley is the driving pulley, and there are no sealing issues between adjacent head pulleys. It uses a common drive shaft for overall drive, ensuring consistent operating speed across all stages. Each end of the leaching unit has its own drive shaft, with each shaft bearing only half the conveying load of the leaching tank, reducing the failure rate. The scraper chain's tail pulley is an idler pulley, mounted on segmented driven short shafts. These driven short shafts do not pass through the partitions between adjacent leaching tanks, simplifying the sealing process, improving reliability, and preventing interstage liquid cross-contamination.

[0046] 7. Multiple sets of X-shaped cross scrapers increase the material agitation frequency, achieving excellent mixing results and improving mass transfer efficiency. The transmission mechanism has a mature and simple structure, high material pushing and discharging efficiency, and ensures smooth material movement within the equipment.

[0047] 8. The inclination angle between the chain pusher plate and the horizontal plane is controlled below 15°, which is suitable for the extraction of powder materials with very small static friction angle. It has high reliability and reasonable flow channel setting. The material and solvent flow in opposite directions to realize full countercurrent immersion extraction, maintain a large extraction power, and have high extraction efficiency. It can solve the problem of large-scale extraction of oily waste clay.

[0048] 9. The highest and lowest liquid levels are fixed, and each stage includes a draining process to remove material from the liquid surface. Before being discharged from the leachate extractor, a separate stage is used for draining, achieving the process goal of large-scale, high-efficiency extraction. Suitable for harsh operating conditions, it boasts high reliability, a reasonable process layout, and a stable and reliable solution; especially for micron-sized powders like clay, which undergo "abnormal" changes under conditions of fluctuating Reynolds numbers, it is one of the few solutions available. Attached Figure Description

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0050] Figure 1 This is a front view of the staggered scraper leaching device of the present invention;

[0051] Figure 2 for Figure 1 The left view;

[0052] Figure 3 This is a top view of the extraction tank in this invention;

[0053] Figure 4 forFigure 3 Sectional view along the middle AA;

[0054] Figure 5 for Figure 3 A sectional view along the middle edge BB;

[0055] Figure 6 for Figure 3 A sectional view along the center CC;

[0056] Figure 7 for Figure 3 A sectional view along the middle DD;

[0057] Figure 8 for Figure 1 A sectional view along the middle of EE;

[0058] Figure 9 for Figure 8 Sectional view along the middle FF;

[0059] Figure 10 This is a perspective view of the transmission mechanism in this invention;

[0060] Figure 11 This is a sectional view of the tail wheel portion of the transmission mechanism;

[0061] Figure 12 This is a perspective view of the temporary feeding device in this invention;

[0062] Figure 13 This is a cross-sectional view of the feeding valve in this invention;

[0063] Figure 14 A perspective view of the temporary feeding device after removing the valve body and protective cover;

[0064] In the diagram: 1. Temporary storage hopper; 1a. Feed inlet; 2. Feeding valve; 2a. Valve body; 2b. Feeding motor; 2c. Feeding reduction mechanism; 2d. Feeding chain; 2e. Feeding drive wheel; 2f. Synchronous gear; 2g. Impeller shaft; 2g1. Mandrel; 2g2. Steel pipe; 2g3. Annular flange; 2h. Feeding blade; 2j. Annular stiffening plate;

[0065] 3. Box body; 3a. Longitudinal partition; 3a1. Interstage overflow outlet; 3b. Inclined bottom wall; 3c. Chain partition; 3c1. Slotted outlet; 3d. Extraction material inlet; 3e. Transverse main inclined chute; 3f. Transverse auxiliary inclined chute; 3g. Material outlet; 3h. Fresh solvent replenishment inlet; 3j. Concentrated solvent outlet; 3k. Soaking tank; 3m. Draining tank;

[0066] 4. driving long shaft; 5. head wheel; 6. scraping chain; 7. scraper; 8. tail wheel; 9. driven short shaft; 10. driven shaft end plate; 11. sliding bearing; 12. driven bearing seat; 13. sealing blind cover; 14. driving speed reducer; 15. main transmission chain; 16. main driving wheel. Embodiments

[0067] In the following description of the present application, the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not mean that the device must have a particular orientation. The soaking tank in which the material enters first is called "upper stage", and the soaking tank in which the material enters later is called "lower stage".

[0068] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in combination with specific drawings.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0070] As shown in Figures 1 to 7 The staggered leaching extraction tank of the present application includes a box body 3, which is provided with a plurality of longitudinal partitions 3a extending along the length direction of the box body and parallel to each other, each longitudinal partition 3a separates the width direction of the box body 3 into a plurality of side-by-side soaking tanks 3k, each soaking tank 3k is respectively provided with an inclined bottom wall 3b, and the inclined directions of the inclined bottom walls 3b of adjacent soaking tanks 3k are opposite.

[0071] The upper side of each inclined bottom wall 3b is respectively provided with a chain partition 3c, and each chain partition 3c is parallel to the lower inclined bottom wall 3b. The scraper descends along the chain partition 3c, turns at the bottom of the soaking tank 3k, and pushes the powder upwards along the inclined bottom wall 3b. The included angle between the inclined bottom wall 3b and the horizontal plane is less than 35°, which facilitates the scraper to push the powder upwards along the inclined bottom wall 3b and reduces the pushing resistance.

[0072] When the material falls into the low end of the soaking tank 3k and contacts the solvent liquid surface, efficient mass transfer begins. The entire solid particles are wrapped in solvent, the mass transfer path is extremely short, and the solute adsorbed on the surface of the solid particles is dissolved and desorbed by the solvent in turbulent state within a few seconds. After several countercurrent washing, a high extraction power is always maintained; finally, the fresh solvent is washed, and the small amount of residual solute is completely washed down due to the high purity of the fresh solvent.

[0073] The part of each inclined bottom wall 3b near the upper end is respectively provided with a horizontal main inclined chute 3e for guiding the material to the lower end of the next immersion tank, and the uppermost end of each inclined bottom wall 3b is respectively provided with a horizontal auxiliary inclined chute 3f for guiding the material to the lowest part of the next immersion tank. The angle between the bottom wall of the horizontal main inclined chute 3e and the horizontal plane is greater than 60°, which is beneficial to the sliding of the powder under the action of gravity. In order to avoid the powder remaining in the horizontal main inclined chute 3e and the horizontal auxiliary inclined chute 3f, a nozzle is arranged above the corresponding chute, and the powder is quickly collapsed and slides by spraying solvent.

[0074] Most of the powder falls on the inclined bottom wall 3b of the next immersion tank from the horizontal main inclined chute 3e, avoiding the risk of blockage caused by too much powder bypassing the tail shaft. A small amount of powder adhering to the chain push plate can further fall down when the head wheel rotates, and falls into the tail end of the next immersion tank 3k from the horizontal auxiliary inclined chute 3f, so that the chain push plate eliminates the problems of back feeding and material accumulation, and ensures the smooth conveying of solid materials. Under the pushing of the scraper, the powder bypasses the tail wheel of the next stage, enters the lower end of the inclined bottom wall 3b, extracts on one side, and goes up along the gentle slope, and gradually separates from the liquid surface.

[0075] The upper part of the extraction material inlet 3d in the middle of the first immersion tank is provided with a temporary feeding device, the powder enters the first immersion tank from the extraction material inlet 3d in the middle, first falls on the chain partition plate 3c, is pushed downward by the scraper, reaches the lowest part of the immersion tank 3k, and is pushed upward along the inclined bottom wall 3b after turning, and is reversely extracted with the extraction liquid. In order to ensure that the powder carries as little solute as possible when it enters the next stage, the powder has a proper draining process after leaving the liquid surface before entering the next extraction stage. Thus, the concentration gradient of the extraction liquid in each stage is obvious, and the extraction power on the granular material is always strong.

[0076] After entering the draining section and continuing to go up for a distance, most of the powder falls into the second immersion tank from the horizontal main inclined chute 3e, and a small amount of powder continues to go up and falls into the second immersion tank from the horizontal auxiliary inclined chute 3f. In this way, the powder goes through multiple immersion stages and reaches the last immersion tank.

[0077] The upper part of the chain partition plate 3c in the last immersion tank is provided with a fresh solvent supplement inlet 3h, and the part above the liquid level of the last chain partition plate is provided with a strip gap 3c1 for allowing the solvent to pass through. The fresh solvent first falls on the upper part of the chain partition plate 3c in the last immersion tank, which not only plays a role in energy dissipation, but also makes the fresh solvent uniformly distributed along the full width direction of the chain partition plate 3c. After flowing downward along the chain partition plate 3c for a distance, the fresh solvent falls like a waterfall from the strip gap 3c1, enters the immersion space between the chain partition plate 3c and the inclined bottom wall 3b, and flows downward along the inclined bottom wall 3b, reversely washing and extracting the powder pushed upward, and then bypassing the lower edge of the chain partition plate 3c to flow upward above the chain partition plate 3c.

[0078] The middle section of the adjacent longitudinal partition plate 3a is provided with a stage overflow port 3a1 for overflowing to the upper stage soaking pool, each stage overflow port 3a1 is located above the current stage chain partition plate and below the upper stage chain partition plate, the height of the stage overflow port 3a1 is lower than the strip port 3c1 of the last stage chain partition plate.

[0079] The stage overflow ports 3a1 of the adjacent two stages are staggered in the length direction of the soaking pool, separated by the chain partition plate 3c and opposite in flow direction, completely avoiding the short flow between stages, and ensuring the complete realization of the full countercurrent extraction.

[0080] The extraction liquid entering the upper stage soaking pool from the stage overflow port 3a1 first flows downward along the soaking space between the chain partition plate 3c and the inclined bottom wall 3b, reaches the bottom of the soaking pool, bypasses the lower edge of the chain partition plate 3c, enters the upper side of the chain partition plate 3c, and then flows upward until it enters the next lower stage through the stage overflow port 3a1.

[0081] After multiple stages of extraction, the extraction liquid enters the first stage soaking pool, flows downward along the soaking space between the chain partition plate 3c and the inclined bottom wall 3b to the tail of the first stage soaking pool, which is the lowest end, and then overflows from the concentrated solvent overflow port 3j on the tail box wall of the first stage soaking pool. The solvent flows by itself under the action of the liquid level difference, and the stage overflow port 3a1 can have a consistent height.

[0082] For materials with high moisture content, wet meal and the like, a draining pool 3m for draining can be provided on the outside of the last stage soaking pool, and the longitudinal partition plate 3a between the draining pool 3m and the last stage soaking pool is a closed structure below the liquid surface to isolate the solvent. The powder material flows upward along the inclined bottom wall 3b of the draining pool 3m to the upper part, and is discharged through the discharge chute to the material outlet 3g on the lower part of the end wall of the box.

[0083] As shown in Figures 8 to 11 The transmission mechanism includes multiple groups of head wheels 5, scraping chains 6 and tail wheels 8, each scraping chain 6 is located in the corresponding soaking pool, each scraping chain 6 is inclined with the bottom wall of the corresponding soaking pool, and the inclination directions of the adjacent two groups of scraping chains 6 are opposite, and the scraping plates 7 are uniformly fixed along the full length of each scraping chain 6 to push the material to climb along the inclined bottom wall of the soaking pool.

[0084] The upper end of each group of scraping chains 6 is wrapped around the head wheel 5, and each head wheel 5 is located at the high end of the soaking pool. Since the soaking pools are arranged in a positive-negative sequence, the two head wheels 5 at the same end are spaced apart by the width of one soaking pool, and the head wheel 5 of the soaking pool in the middle is located at the other end of the extractor.

[0085] The head wheels 5 at the same end of the leaching device are fixed on the corresponding driving long shafts 4, the shaft ends of the two driving long shafts 4 are respectively provided with main driving wheels 16, the scraping driving mechanism comprises a driving speed reducer 14, the input end of the driving speed reducer 14 is driven by a scraping motor, and the output end of the driving speed reducer 14 is in transmission connection with the main driving wheel 16 through a main transmission chain 15. Since each head wheel 5 is located above the liquid level, the driving long shafts 4 of the soaking tanks in the same direction are driven, there is no problem of leakage of the extraction liquid, and each stage of the scraping chain 6 can be kept in completely synchronous operation.

[0086] The lower ends of each group of scraping chains 6 are respectively wound around the tail wheels 8, each tail wheel 8 is immersed in the extraction liquid and located at the lowest end of the soaking tank, the load is extremely light, each tail wheel 8 is fixed in the middle of the corresponding driven short shaft 9, the two ends of each driven short shaft 9 are respectively supported in the driven bearing seat 12 through sliding bearings 11, the outer end of the driven bearing seat 12 is covered with a sealing blind cover 13, the inner convex ring of the sealing blind cover 13 is embedded in the outer end of the driven bearing seat 12, and the flange edge of the sealing blind cover 13 is pressed and fixed on the outer periphery of the driven bearing seat 12 through a sealing gasket.

[0087] The driven bearing seat 12 is fixed at the center hole of the driven shaft end plate 10, and the outer flange of the driven bearing seat 12 is pressed and fixed on the driven shaft end plate 10 through a sealing gasket. The flange edge of the driven shaft end plate 10 is fixed on the longitudinal partition plate of the adjacent soaking tank through a sealing gasket. In this way, each driven short shaft 9 is arranged in sections and located at the bottom of each soaking tank, and the two ends are completely sealed with the longitudinal partition plate of the soaking tank, so that there is no risk of leakage of the soaking liquid between adjacent soaking tanks, and the extraction effect is ensured.

[0088] The transmission mechanism is highly consistent with the mass transfer principle in the process of conveying materials: the extraction liquid level in the equipment is fixed, the bottom wall of the soaking tank is inclined, and each conveying process includes the following actions: the drained materials are mixed into low-concentration extraction liquid again for direct mass transfer, the extraction material layer is reconstructed on the inclined bottom of the soaking tank, and the weak stirring effect mass transfer is realized under the pushing and sweeping of the scraper, and the solute is discharged as much as possible during the draining process off the liquid surface, which guarantees the further reduction of the solute concentration and maintains the extraction power.

[0089] As shown in Figures 12 to 14 The temporary storage feeding device comprises a temporary storage hopper 1 and a feeding valve, the temporary storage hopper 1 is tapered in the length and width directions, the upper end of the temporary storage hopper 1 is provided with a feeding port 1a, and the lower end of the temporary storage hopper 1 is provided with the feeding valve 2.

[0090] The feeding valve 2 comprises a valve body 2a, a feeding motor 2b, a feeding speed reduction mechanism 2c, a feeding chain 2d, a feeding driving wheel 2e, a synchronous gear 2f, an impeller shaft 2g and feeding blades 2h. Two parallel impeller shafts 2g are arranged along the length direction of the feeding valve 2, and the feeding blades 2h are radially and uniformly distributed on the outer periphery of the impeller shafts 2g, respectively extend along the length direction of the impeller shafts 2g, and are located in the inner cavity of the valve body 2a. The length of the feeding blades 2h matches the length of the inner cavity of the valve body 2a. The outer edges of the feeding blades 2h respectively point to the outer walls of the adjacent impeller shafts 2g, and the feeding blades 2h on the adjacent impeller shafts 2g are cross-fitted.

[0091] The upper port of the valve body 2a is rectangular and is connected with the lower port of the temporary storage hopper 1, and the lower port of the valve body 2a is rectangular and is connected with the feed inlet of the leaching device. The valve body 2a is provided with arc-shaped side walls along the length direction, which match the revolution circumference of the feeding blades 2h.

[0092] The same side shaft ends of the two impeller shafts 2g are respectively provided with the synchronous gears 2f, and the two synchronous gears 2f are meshed with each other, so that the two impeller shafts 2g are reversely and synchronously rotated and keep a fixed phase difference.

[0093] The feeding speed reduction mechanism 2c is fixed to the outer wall of the valve body 2a. The high-speed input end of the feeding speed reduction mechanism 2c is driven by the feeding motor 2b, and the low-speed output end is connected with the feeding driving wheel 2e through the feeding chain 2d or a synchronous belt. The feeding driving wheel 2e is installed at the other side shaft end of the driving impeller shaft 2g.

[0094] The impeller shaft comprises a coaxial core shaft 2g1 and a steel pipe 2g2. The steel pipe 2g2 is sleeved on the outer periphery of the core shaft 2g1. The two ends of the steel pipe 2g2 are welded to the outer periphery of the core shaft 2g1 through annular webs 2g3 and are coaxial. The roots of the feeding blades are welded to the outer wall of the steel pipe 2g2.

[0095] The outer wall of the steel pipe 2g2 is symmetrically welded with at least two annular rib plates 2j. The annular rib plates 2j respectively pass through the notches of the feeding blades and are welded together, so as to improve the strength of the feeding blades 2h.

[0096] The working process of the temporary storage and feeding device is as follows:

[0097] The raw material enters the temporary storage hopper 1 through the feeding port 1a, gradually accumulates in the temporary storage hopper 1, forms an inverted conical material column, and the material column maintains a certain height to start the sealing of the medium in the leaching device. The feeding motor 2b is started, and after being decelerated by the feeding deceleration mechanism 2c, the feeding chain 2d drives the feeding driving wheel 2e to rotate, the feeding driving wheel 2e drives the driving impeller shaft 2g to rotate, and the synchronous gear 2f drives the driven impeller shaft 2g to rotate in the opposite direction synchronously. The material fills in the groove between the feeding blades 2h, the feeding blades 2h on the two impeller shafts 2g rotate outward on the valve body 2a respectively, avoiding extrusion to the middle part, the material rotates to the lowermost part of the impeller after the arc segment of the valve body, and the material falls under the action of gravity. The frequency control of the feeding motor 2b is used to adjust the rotation speed of the impeller, and the rotation speed of the impeller is strictly proportional to the feeding amount, so that the precise control of the feeding amount is realized.

[0098] The relative position of the double impellers is determined by the two synchronous gears 2f, and a fixed phase difference is maintained between them, which is equal to half of the included angle between two adjacent feeding blades 2h. The two impellers produce similar meshing opposite rotation, which plays a mutual self-cleaning function.

[0099] The impeller is a short-blade open structure, and the feeding blades 2h are open at both ends, which is an open structure. The gap formed by the end cover of the valve body and the end cover can avoid the material, which can cause blockage during operation and large friction. The open impeller can eliminate the blockage phenomenon.

[0100] The tooth-shaped groove formed by the feeding blade 2h and the steel pipe 2g2 is a feeding channel, the groove depth is shallow, and it is not easy to produce accumulation, and precise feeding can be realized. Even if there is some material in the groove, it can be self-cleaning through the meshing of the double impellers.

[0101] The extraction method of the staggered scraper type leaching device comprises the following steps in sequence:

[0102] A1, the fresh solvent first falls on the upper part of the chain partition of the last stage soaking pool, flows downward to the right, fills the full width of the chain partition, and then falls like a waterfall from the gap, enters the soaking space between the chain partition and the inclined bottom wall of the last stage, and flows downward to the right, and the powder in the opposite direction is washed and extracted;

[0103] A2, the extraction liquid enters the lower part of the chain partition of the upper stage soaking pool from the inter-stage overflow port of the last stage, enters the soaking space between the chain partition and the inclined bottom wall of the stage, and flows downward to the left, and the powder in the opposite direction is extracted, and the solvent enters the upper part of the chain partition by bypassing the lower edge of the chain partition after reaching the bottom of the soaking pool of the stage, and flows upward to the right;

[0104] A3, the extraction liquid from the stage of the interstage overflow port into more upper level immersion pool chain partition below, into the stage between the chain partition and the inclined bottom wall immersion space, and down to the right flow, to the reverse of the powder extraction, solvent to the bottom of the stage immersion pool after bypass chain partition lower edge into the chain partition above, in turn to the left up flow;

[0105] A4, the extraction liquid from the stage of the interstage overflow port into more upper level chain partition and the inclined bottom wall between the immersion space, in turn;

[0106] A5, the extraction liquid to the bottom of the first stage immersion pool after bypass chain partition lower edge, up from the concentrated solvent outlet.

[0107] The temporary feeding device feeds new material into the first stage immersion pool and falls on the chain partition, which is pushed down to the right by the scraper and immersed below the liquid level, turns after reaching the bottom of the first stage immersion pool, enters the immersion space between the chain partition and the inclined bottom wall, moves up to the left and extracts, continues to move up to the left and dries after gradually drying out the liquid level;

[0108] The material dried in the first stage slides laterally from the upper part of the first stage inclined bottom wall into the low end of the second stage immersion pool, moves up to the right and extracts along the immersion space between the chain partition and the inclined bottom wall of the stage, continues to move up to the right and dries after gradually drying out the liquid level, slides laterally from the upper part of the inclined bottom wall into the low end of the third stage immersion pool, and so on;

[0109] The material at the upper end of the inclined bottom wall of the last stage immersion pool falls into the low end of the drying pool, climbs along the inclined bottom wall of the drying pool and finally dries, and is discharged through the discharge chute to the material outlet.

[0110] The above only describes the preferred embodiments of the present application, shows and describes the basic principles, main features and advantages of the present application, and does not limit the patent protection scope of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments. In addition to the above embodiments, other embodiments of the present application can be obtained without departing from the spirit and scope of the present application. The present application can also have various changes and improvements. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present application. The scope of protection of the present application is defined by the appended claims and their equivalents. The technical features of the present application not described herein can be realized by or using existing technology, which will not be described here.

Claims

1. An interleaved flighted infuser comprising a housing, characterized in that, The box is provided with multiple longitudinal partitions extending along the length direction of the box and parallel to each other, each longitudinal partition separates the width direction of the box into multiple immersion pools in parallel and in series. Each immersion pool is provided with an inclined bottom wall, the inclined directions of the inclined bottom walls of adjacent immersion pools are opposite, each immersion pool is provided with a ring-shaped chain scraping mechanism, the upper side of the first-stage immersion pool is provided with a temporary feeding device; The upper side of each inclined bottom wall is provided with a chain partition, each chain partition is parallel to the underlying inclined bottom wall, the upper layer of the chain scraping mechanism descends along the corresponding chain partition, the lower layer of the chain scraping mechanism scoops out the material from the bottom of the corresponding immersion pool, drains and pushes the material upward along the inclined bottom wall, the upper end of each inclined bottom wall is provided with a horizontal chute for guiding the material to the lower end of the next-stage immersion pool.

2. The staggered flighted infuser of claim 1, wherein: The middle section of adjacent longitudinal partitions is provided with an inter-stage overflow port for overflowing to the next-stage immersion pool, each inter-stage overflow port is located above the chain partition of the present stage and below the chain partition of the next stage, the upper side of the chain partition of the last-stage immersion pool is provided with a fresh solvent supplement port.

3. The staggered flighted infuser of claim 2, wherein: The part of each inclined bottom wall close to the upper end is provided with a horizontal main inclined chute for guiding the material to the lower end of the next-stage immersion pool, the uppermost end of each inclined bottom wall is provided with a horizontal auxiliary inclined chute for guiding the material to the lowest part of the next-stage immersion pool.

4. The staggered flighted infuser of claim 1, wherein: The angle between the bottom wall of the horizontal main inclined chute and the horizontal plane is greater than 60°, the angle between the inclined bottom wall and the horizontal plane is less than 15°.

5. The staggered flighted infuser of claim 1, wherein: The inter-stage overflow ports of two connected stages are staggered in the length direction of the immersion pool.

6. The staggered flighted infuser of claim 5, wherein: The part of the last-stage chain partition above the liquid level is provided with a slot for allowing the solvent to pass through, the wall of the box on the side of the lowest end of the first-stage immersion pool is provided with a concentrated solvent outlet. The fresh solvent first falls on the upper part of the chain partition of the last-stage immersion pool, flows downward and to the right, covers the full width of the chain partition, then falls like a waterfall from the slot, enters the immersion space between the last-stage chain partition and the inclined bottom wall, and flows downward and to the right, washes and extracts the powder moving in the opposite direction, after reaching the bottom of the last-stage immersion pool, the solvent bypasses the lower edge of the chain partition, enters the upper side of the chain partition, and flows upward and to the left. The extraction liquid enters the lower side of the chain partition of the next-stage immersion pool from the inter-stage overflow port of the last stage, enters the immersion space between the chain partition and the inclined bottom wall of the stage, and flows downward and to the left, extracts the powder moving in the opposite direction, after reaching the bottom of the stage immersion pool, the solvent bypasses the lower edge of the chain partition, enters the upper side of the chain partition, and flows upward and to the right.

7. The staggered flighted infuser of claim 1, wherein: The extraction liquid enters the lower side of the chain partition of the next-stage immersion pool from the inter-stage overflow port of the last stage, enters the immersion space between the chain partition and the inclined bottom wall of the stage, and flows downward and to the right, extracts the powder moving in the opposite direction, after reaching the bottom of the stage immersion pool, the solvent bypasses the lower edge of the chain partition, enters the upper side of the chain partition, and flows upward and to the left. The extraction liquid enters the lower side of the chain partition of the next-stage immersion pool from the inter-stage overflow port of the last stage, enters the immersion space between the chain partition and the inclined bottom wall of the stage, and flows downward and to the right, extracts the powder moving in the opposite direction, after reaching the bottom of the stage immersion pool, the solvent bypasses the lower edge of the chain partition, enters the upper side of the chain partition, and flows upward and to the left. The outside of the last-stage immersion pool is further provided with a stage draining pool, the longitudinal partition between the draining pool and the last-stage immersion pool is a closed structure below the liquid surface, the upper end of the inclined bottom wall of the draining pool is provided with a chute connected with the material outlet.

8. The staggered flighted infuser of claim 1, wherein: The chain scraping mechanism comprises scraping chains and scraping plates fixed uniformly on the scraping chains, the upper ends of each group of scraping chains are wrapped around the head wheels above the liquid surface, the lower ends of each group of scraping chains are wrapped around the tail wheels and immersed in the extraction liquid, the head wheels at the same end of the leaching device are fixed on the corresponding driving long shafts, the shaft ends of the two driving long shafts are respectively provided with main driving wheels, and the two main driving wheels are respectively driven by the respective scraping driving mechanisms.

9. The staggered flighted infuser of claim 8, wherein: The tail wheels are respectively fixed in the middle of the respective driven short shafts, and the two ends of each driven short shaft are respectively supported on the bottom of the longitudinal partition plate of the adjacent soaking tank through bearings.

10. The staggered flighted infuser of claim 9, wherein: The shaft ends of the driven short shafts are supported in sliding bearings, the sliding bearings are embedded in driven bearing seats, the outer ends of the driven bearing seats are covered with sealing blind covers, the driven bearing seats are sealingly fixed at the central holes of driven shaft end plates, and the driven shaft end plates are sealingly fixed on the corresponding longitudinal partition plates.

11. The staggered flighted infuser of claim 1, wherein: The temporary feeding device comprises a temporary hopper, which is tapered in the length and width directions, with the upper end being narrow and the lower end being wide, and the lower end of the temporary hopper is provided with a feeding valve. Impeller shafts are provided with two parallel shafts, which respectively extend along the length direction of the feeding valve; Feeding blades are radially and uniformly distributed on the outer periphery of the impeller shafts, located in the inner cavity of the valve body and respectively extend along the length direction of the impeller shafts, the outer edges of each feeding blade respectively point to the outer wall of the adjacent impeller shaft, the feeding blades on the adjacent impeller shafts are cross-embedded and the phase difference is half of the included angle between the coaxial adjacent feeding blades; The valve body is rectangular at the upper and lower ends, and is provided with an arc-shaped side wall in the length direction, which matches the revolution circumference of the feeding blades; Synchronous gears are respectively installed on the same side shaft ends of the two impeller shafts and are meshed with each other, so that the two impeller shafts are reversely and synchronously rotated; A driving wheel is installed on the other side shaft end of one of the impeller shafts, A feeding speed reduction mechanism is driven by a feeding motor at the input end and drives the driving wheel through a chain or a synchronous belt at the output end.

12. An extraction method of a staggered blade type extractor using the staggered blade type extractor according to claim 8, characterized in that, The method comprises the following steps in sequence: A1, the fresh solvent first falls on the upper part of the chain partition plate of the last soaking tank, flows downward and to the right, covers the full width of the chain partition plate, and then falls like a waterfall from the gap, enters the soaking space between the last chain partition plate and the inclined bottom wall, and flows downward and to the right, thereby washing and performing the last extraction on the powder that moves in the opposite direction; when the solvent reaches the bottom of the last soaking tank, it bypasses the lower edge of the chain partition plate and enters the upper part of the chain partition plate, and then flows upward and to the left; A2, the extraction liquid enters the lower part of the chain partition plate of the upper soaking tank from the inter-stage overflow port of the last soaking tank, enters the soaking space between the chain partition plate and the inclined bottom wall of the soaking tank, and flows downward and to the left, thereby extracting the powder that moves in the opposite direction; when the solvent reaches the bottom of the soaking tank, it bypasses the lower edge of the chain partition plate and enters the upper part of the chain partition plate, and then flows upward and to the right. A3, the extraction liquid from the interstage overflow port of the stage enters the lower side of the chain partition of the immersion tank of the next stage, enters the immersion space between the chain partition and the inclined bottom wall of the stage, and flows downward to the right, extracting the powder that moves in the opposite direction, and after the solvent reaches the bottom of the immersion tank of the stage, bypasses the lower edge of the chain partition to enter the upper side of the chain partition, and flows upward to the left; A4, the extraction liquid enters the immersion space between the chain partition and the inclined bottom wall of the upper stage from the interstage overflow port, and so on; A5, the extraction liquid bypasses the lower edge of the chain partition after reaching the bottom of the immersion tank of the first stage, and flows out upward from the concentrated solvent outlet.

13. The process of extraction of an interleaved flighted infuser according to claim 12, wherein, The temporary feeding device feeds the new material into the immersion tank of the first stage and falls on the chain partition, which is pushed downward to the right by the scraper and immersed below the liquid level, turns after reaching the bottom of the immersion tank of the first stage, moves upward to the left in the immersion space between the chain partition and the inclined bottom wall, and extracts, continues to move upward to the left and drains after gradually drying out of the liquid level; The material drained from the first stage moves upward to the right in the immersion space between the chain partition and the inclined bottom wall of the second stage, and extracts, continues to move upward to the right and drains after gradually drying out of the liquid level, and so on; The material at the upper end of the inclined bottom wall of the last stage falls into the low end of the draining tank, climbs along the inclined bottom wall of the draining tank and finally drains, and is discharged through the discharge chute to the material outlet.

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