High-efficiency low-abrasion leaching device

Abstract

The utility model relates to a leaching device, in particular to a high-efficiency low-abrasion leaching device and a using method thereof. The high-efficiency and low-abrasion leaching device comprises a leaching device, a rotating shaft is arranged in the center of the interior of the leaching device, a plurality of leaching cells are divided by connecting the rotating shaft and a separating plate on the inner wall of the leaching device, a collecting hopper with the same sectional area as the leaching device is arranged at the bottom of the leaching device, and the collecting hopper is provided with a plurality of collecting cells and a discharging cell. An oil collecting hopper is arranged on the outer side of the collecting hopper and provided with oil collecting cells, the bottom of each collecting cell is connected with one end of a solid conveying device, and the other end of each solid conveying device is located above the corresponding leaching cell on the top. According to the method, extraction is carried out in a mode that a solvent does not move and a solid moves, solid powder continuously falls down, which is equivalent to upward flushing of liquid, so that the solid and the liquid in a leaching grid do not violently turn over, the extraction process can be completed in a mild mode, no false bottom is arranged, and the abrasion of the false bottom does not exist.

Description

Technical Field

[0001] The utility model relates to a leaching device, in particular to an efficient and low-wear leaching device. Background Art

[0002] Leaching vessels are usually used in the extraction process of components soluble in solvents in plant fibers. The plant fiber powder is placed in the leaching grids inside the leaching vessel, and a solvent is injected into the leaching grids. The solvent overflows from the top of the leaching grids into the corresponding oil-collecting grids in the oil-collecting hopper below. Then the solvent is pumped out from the oil-collecting grids and pumped back into the upper leaching grids from the bottom of the aggregate grid for reuse. After repeated leaching, the aggregate grid inside the leaching vessel rotates along the rotating shaft, and the leaching process ends after one rotation, and discharging is required. Usually, with the design of one oil-collecting grid and a missing false bottom above, when the leaching grid rotates to this position, the solid-liquid mixture will fall into the oil-collecting hopper together. The solid needs to be precipitated, then the solvent is discharged, and finally the solid containing some solvent is centrifuged and the solvent is recovered by distillation. However, the biggest drawback of this device is that during the entire use process of the false bottom, as the upper leaching vessel keeps rotating, it is constantly worn, and the false bottom needs to be frequently repaired and replaced; a seal is provided between the leaching grid and the false bottom. The false bottom does not rotate while the leaching grid rotates. The seal between the leaching grid and the false bottom must be tight to prevent liquid from leaking between the leaching grid and the false bottom. If the seal is not tight, the liquid will leak into the adjacent leaching grids, resulting in "grid cross-leakage". If the seal between the leaching grid and the false bottom is not tight, it will also flow into the lower oil-collecting hopper, causing abnormal operation. Therefore, the sealing components between the leaching grid and the false bottom need to be frequently replaced to maintain their good sealing performance to ensure the normal operation of the leaching process; and when discharging, the solid-liquid mixture falls together and is recovered, with the solid carrying liquid, resulting in relatively high energy consumption in the subsequent solid-liquid separation process. Also, when the solvent flows from the bottom up to the bottom of the leaching grid, the solid powder is washed up, and the powder surges upward and directly overflows into the oil-collecting hopper along with the solvent. The powder material clogs the pipeline during the solvent circulation process and is difficult to clean, and at the same time, powder loss will also occur. This solvent circulation leaching method has low leaching efficiency and poor effect.

[0003] Patent CN220633084U discloses an anti-clogging liquid spraying device for a leaching apparatus. The leaching apparatus includes a leaching vessel. A liquid distribution plate is provided at the bottom of the leaching vessel. A oil collecting hopper with a diameter larger than that of the leaching vessel is provided at the bottom of the leaching vessel. An aggregate grid is provided inside the leaching vessel. An oil collecting grid corresponding to the aggregate grid is provided in the oil collecting hopper. An anti-clogging liquid spraying mechanism is provided below the liquid distribution plate at the bottom of the leaching vessel corresponding to the aggregate grid. A liquid extraction pipe is provided on the side wall of the oil collecting hopper, and the liquid extraction pipe is connected to a circulation pump. The anti-clogging liquid spraying mechanism includes a number of liquid spraying holes provided on the liquid distribution plate. A liquid spraying groove is fixedly provided below the liquid distribution plate along the direction of the liquid spraying holes. The circulation pump is connected to one end of the liquid spraying groove near the outer edge of the liquid distribution plate through a liquid inlet pipeline, and the bottom of the other end is connected to the liquid extraction pipe through a circulation pipeline. By providing the anti-clogging liquid spraying mechanism, using the inertia of solid materials, the solids will not enter the leaching vessel upward to block the liquid spraying holes, but will rush forward into the buffer zone of the liquid spraying groove and circulate through the circulation pipeline from below the buffer zone. Although this patent solves to a certain extent the problem of powder clogging when the solvent is pumped upward from the bottom, it cannot completely eliminate it, and there are still problems of false bottom wear and frequent replacement of sealing components. The leaching method of solvent circulation has low leaching efficiency and poor effect. At the same time, in the prior art, the solid materials and the solvent rotate together in the leaching grid and rotate to the oil collecting grid (i.e., the discharge grid) without a false bottom. After the solid powder settles, the solvent needs to be discharged before the solids can be discharged, and the structure and process are complex. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an efficient and low-wear leaching device, without a false bottom, eliminating the wear and replacement of the false bottom, and at the same time without using a sealing component, without the need for regular repair and replacement of the sealing component. At the same time, the leaching is carried out by the method of keeping the solvent stationary and circulating the solids, greatly improving the leaching effect.

[0005] The efficient and low-wear leaching device described in the present invention includes a leaching vessel. A rotating shaft is provided at the center inside the leaching vessel. A number of leaching grids are separated by a separation plate connecting the rotating shaft and the inner wall of the leaching vessel. The bottom of the leaching vessel is provided with an aggregate hopper having the same cross-sectional area as the leaching vessel. The aggregate hopper is provided with a number of aggregate grids, a discharge grid and an overflow grid. An oil collecting hopper is provided outside the aggregate grid and the overflow grid. The oil collecting hopper is provided with an oil collecting grid. One end of each aggregate grid and overflow grid is connected to a solid transportation device, and the other end of the solid transportation device is located above the top leaching grid.

[0006] The present invention breaks the conventional thinking in the prior art that leaching is carried out by circulating the solvent and keeping the solids stationary. Circulating the solids and keeping the solvent stationary can greatly improve the leaching efficiency and effect. At the same time, it avoids the problem that when the solvent is pumped from the bottom, the solid powder in the leaching grid surges and overflows with the solvent to the oil collecting grid, resulting in losses, and also eliminates the problem of powder clogging in the solvent spraying mechanism, achieving multiple benefits at once.

[0007] The solvent remains stationary while the solid powder moves. The solid powder continuously falls down, which is equivalent to the liquid flushing upward. In this leaching method, the solid and liquid inside the leaching cell do not surge violently, and the leaching process can be completed in a gentle manner.

[0008] Further, the solid transportation device is a scraper conveyor, and a feeding port is opened at the position directly above the leaching cell of the scraper conveyor.

[0009] Further, a sieve plate is inclined downward in front of the feeding port.

[0010] After passing through the inclined sieve plate, the solid powder is evenly distributed, so that the solid powder falling into the solvent has a high dispersion degree, and the leaching process can proceed more fully.

[0011] Further, the aggregate cell, the discharge cell, and the overflow cell are separated by a material dividing plate inside the aggregate hopper. The oil collecting cell is separated by a dividing plate inside the oil collecting hopper. The discharge cell and the overflow cell are adjacent. An inlet pipe is provided above the leaching device corresponding to the upper part of the aggregate cell adjacent to the other side of the discharge cell. A liquid inlet pipe is provided above the leaching device corresponding to the upper part of the aggregate cell adjacent to the other side of the overflow cell. A liquid discharge pipe is opened at the bottom of the oil collecting cell corresponding to the lower part of the inlet pipe. The height of the dividing plate decreases in sequence starting from the overflow cell.

[0012] Further, one end of the solid transportation and discharge device is connected to the bottom of the discharge cell. The other end of the solid transportation and discharge device is connected to the solid removal or solvent recovery equipment. A branch solid return device is provided on the solid transportation and discharge device. The other end of the branch solid return device is located directly above the overflow cell.

[0013] A solvent replenishing pipe is provided at the outer bottom of the oil collecting cell. The top of the solvent replenishing pipe is located above the leaching cell. A transportation pump is provided on the solvent replenishing pipe. The upper outlet of the solvent replenishing pipe is arranged at a position away from the outer edge of the leaching cell. So that the supplementary solvent transported from the oil collecting cell to the top of the leaching cell can be fully mixed with the original solvent instead of overflowing directly from the outer edge of the leaching cell.

[0014] Taking the position below the setting position of the inlet pipe as the starting leaching cell, it rotates in the direction opposite to the position of the lower discharging cell. Fresh solvent is replenished through the liquid inlet pipe in front of the overflow cell, realizing the use of the cleanest solvent to wash the cleanest material before discharging, and countercurrent cleaning, which improves the leaching effect and leaching efficiency.

[0015] The solid transportation and discharge device and the branch solid return device are preferably scraper conveyors.

[0016] The number of leaching cells is greater than or equal to the sum of the numbers of the aggregate cell and the discharge cell, and the sum of the numbers of the aggregate cell and the discharge cell is at least three.

[0017] The aggregate hopper is provided with at least two aggregate compartments and one discharge compartment; the aggregate compartments and the discharge compartment do not need to be arranged corresponding to the upper dipping compartments above. The reduction in the number of aggregate compartments and discharge compartments can reduce the number of solid transportation devices (scraper conveyors) provided, thereby reducing equipment costs.

[0018] The large number of dipping compartments is to evenly disperse the circulating solid materials in multiple dipping compartments, avoiding uneven distribution of solid powder, too thick or too thin material layers.

[0019] The number of oil collecting compartments is at least two. At least two are required to form a countercurrent extraction of the solvent, and it should not be too many to avoid complex equipment.

[0020] Working principle: Open the feed pipe to inject the solid powder to be leached into the leaching compartment. The rotating shaft is controlled by a motor to drive the leaching device to rotate. The rotation direction of the leaching compartments at the upper part of the leaching device is the same as the direction in which the height of the partition plate increases successively. So that the leaching device rotates and finally passes through the discharge compartment. The solid powder entering the leaching compartment falls. Without the obstruction of a false bottom, it directly enters the lower aggregate compartment. As the solid powder continuously increases until all the aggregate compartments are filled with solid powder and it is higher than the junction of the aggregate hopper and the leaching compartment of the leaching device. At this time, open the liquid inlet pipe and add the solvent into each leaching compartment at a certain speed. Since the solid has sealed the junction of the aggregate hopper and the leaching device, the solvent only exists in the leaching device above the aggregate hopper. As the solvent is continuously added, after the leaching compartment is filled, the solvent overflows downward from the outer edge at the top of the leaching compartment into the oil collecting grid of the oil collecting hopper. The solvent in the oil collecting grid then falls upward through the top of the leaching compartment through the solvent replenishing pipe to increase the concentration of the substances extracted in the solvent. The solvent in the oil collecting grid overflows downward along the partition plate with gradually decreasing height and is finally transported to the solvent recovery device for recovery through the liquid discharge pipe. The liquid discharge pipe is located directly below the feed pipe where the saturation of the solvent is the highest. In this way, the solid powder newly added can be leached with the solvent having the highest saturation, thus realizing the countercurrent extraction of the solvent. Continuously transport the solid powder at the bottom of each aggregate compartment upward to the top of the leaching compartment of the leaching device through a scraper conveyor, and it falls through the feeding port and passes through the inclined sieve plate to evenly distribute the solid powder. So that the solid powder falling into the solvent has a high degree of dispersion, making the leaching process proceed more fully. The solid powder dispersed by the sieve plate falls into the solvent in the leaching compartment and completes the leaching during the process of sinking from top to bottom. Control the speed of the scraper conveyor scraping the solid powder at the bottom so that the height of the piled solid powder always remains above the junction of the aggregate hopper and the leaching compartment of the leaching device. The feeding port of the scraper conveyor corresponding to the aggregate compartment before the overflow compartment transports a part of the solid powder to the overflow compartment through the material distribution guide plate. The amount of the separated solid powder is such that the height of the solid powder in the overflow compartment is close to being full, so that the solvent overflows (it should be noted that the solid powder inside the aggregate compartment before the overflow compartment is already in a state where it can be discharged). At the same time, keep the height of the solid material in the aggregate compartment before the overflow compartment not lower than the junction of the aggregate hopper and the leaching compartment of the leaching device. Or use a branch solid return device to transport part or all of the solid powder transported out of the discharge compartment back to the overflow compartment. Similarly, make the amount of the solid powder such that the height of the solid powder in the overflow compartment is close to being full. The solid powder in the overflow compartment continues to rotate to the discharge compartment and the leached solid powder is transported to the next process section through the solid transportation and discharge device.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] (1) The false bottom in contact with the bottom of the leaching apparatus of the present utility model is removed. By filling solid powder above the junction of the aggregate hopper and the leaching grid of the leaching apparatus, with solvent above the solid powder, there is no solvent leakage, eliminating the wear and replacement of the false bottom. At the same time, no sealing components are used, and there is no need to repair and replace the sealing components regularly. The equipment is simple and more suitable for continuous operation.

[0023] (2) At the same time, the method of keeping the solvent stationary and circulating the solid powder is adopted for leaching, greatly improving the leaching effect.

[0024] (3) In the present utility model, the solid powder is transported outward from the bottom and lifted above the leaching grid, and then the solid powder is dropped. The dropping process of the solid powder in the solvent can achieve relatively thorough leaching, with high efficiency and good effect.

[0025] (4) In the present utility model, a sieve plate is inclined below the feeding port, which can evenly disperse the materials and make them fall clearly one by one, further improving the leaching efficiency and effect.

[0026] (5) The present utility model breaks the conventional thinking in the prior art that leaching is solvent circulation and solid immobility. Solid circulation and solvent immobility can greatly improve the leaching efficiency and effect. At the same time, it avoids the problem that when the solvent is injected from the bottom, the solid powder in the leaching grid surges, follows the solvent and overflows into the oil collecting grid, resulting in losses, and also eliminates the problem of powder blockage in the solvent injection mechanism, achieving multiple benefits at one stroke.

[0027] (6) When the leaching apparatus of the present utility model rotates above the discharging grid, there is no need for the complex design of first precipitating, then discharging the solvent, and then discharging the solid. In the overflow grid in front of the discharging grid, through the recycled solid materials separated from the previous stage, the position of the solid powder in the overflow grid is close to full grid, and most of the solvent is separated by overflowing in the overflow grid. The separated solid automatically turns into the discharging grid and is transported to the next process section conveniently and quickly. Description of the Drawings

[0028] The drawings described herein are used to provide a further understanding of the present utility model and form a part of the present utility model. In the drawings:

[0029] Figure 1 is a three-dimensional structural schematic diagram of the high-efficiency and low-wear leaching apparatus described in the present utility model;

[0030] Figure 2 is a three-dimensional structural schematic diagram of the aggregate hopper and the oil collecting hopper of the high-efficiency and low-wear leaching apparatus described in the present utility model;

[0031] Figure 3 is a three-dimensional structural schematic diagram of the aggregate hopper of the high-efficiency and low-wear leaching apparatus described in the present utility model;

[0032] Figure 4 The front view of the high-efficiency and low-wear leaching device described in the present utility model;

[0033] Figure 5 The top view of the positional relationship among the feed pipe, liquid inlet pipe, solvent replenishing pipe, solid transportation and discharging device, and leaching tank in Embodiment 1 of the present utility model;

[0034] Figure 6 The top view of the aggregate hopper and oil collecting hopper in Embodiment 1 of the present utility model;

[0035] Figure 7 The three-dimensional structural schematic diagram of the material discharge port and the material distribution guide plate described in the present utility model;

[0036] Figure 8 The top view of the positional relationship among the feed pipe, liquid inlet pipe, solvent replenishing pipe, solid transportation and discharging device, and leaching tank in Embodiment 2 of the present utility model;

[0037] Figure 9 The top view of the aggregate hopper and oil collecting hopper in Embodiment 2 of the present utility model.

[0038] In the figure:

[0039] 1. Leaching tank; 2. Leaching grid; 3. Separation plate; 4. Aggregate hopper; 401. Aggregate grid; 402. Material distribution plate; 403. Discharge grid; 404. Overflow grid; 5. Oil collecting hopper; 501. Oil collecting grid; 502. Grid division plate; 503. Liquid discharge pipe; 6. Rotating shaft; 7. Scraper conveyor; 701. Material discharge port; 702. Sieve plate; 703. Material distribution guide plate; 8. Feed pipe; 9. Liquid inlet pipe; 10. Solvent replenishing pipe; 11. Solid transportation and discharging device; 12. Branch solid return device. Detailed implementation manners

[0040] The following further illustrates the present utility model in conjunction with embodiments, but the protection scope of the present utility model is not limited thereto.

[0041] All raw materials used in the embodiments are commercially available unless otherwise specified.

[0042] Embodiment 1

[0043] As Figures 1-7As shown, the efficient and low-wear leaching device includes a leaching vessel 1. A rotating shaft 6 is provided at the center inside the leaching vessel 1. A separation plate 3 connecting the rotating shaft 6 and the inner wall of the leaching vessel 1 divides the inside of the leaching vessel 1 into several leaching cells 2. A collecting hopper 4 with the same cross-sectional area as the leaching vessel 1 is provided at the bottom of the leaching vessel 1. The collecting hopper 4 is provided with several collecting cells 401, a discharge cell 403, and an overflow cell 404. An oil collecting hopper 5 is provided outside the collecting cells 401 and the overflow cell 404. The oil collecting hopper 5 is provided with an oil collecting cell 501. One end of a solid transportation device is connected to the bottom of each collecting cell 401 and the overflow cell 404, and the other end of the solid transportation device is located above the top leaching cell 2.

[0044] The utility model breaks the conventional thinking in the prior art that leaching is solvent circulation and solids are stationary. Solids circulation and solvent immobility can greatly improve the efficiency and effect of leaching. At the same time, it avoids the problem that when the solvent is injected from the bottom, the solid powder in the leaching cell 2 surges, follows the solvent and overflows into the oil collecting cell 501, resulting in losses, and also eliminates the problem of powder blockage in the solvent injection mechanism, achieving multiple benefits at one stroke.

[0045] The solvent is stationary and the solid powder moves. The solid powder continuously and continuously falls downward, which is equivalent to the liquid flushing upward. In this leaching method, the solids and liquids inside the leaching cell 2 do not surge violently, and the leaching process can be completed in a gentle manner.

[0046] Further, the solid transportation device is a scraper conveyor 7, and a feeding opening 701 is opened at the position of the scraper conveyor 7 directly above the leaching cell 2.

[0047] Further, a sieve plate 702 is inclined downward in front of the feeding opening 701.

[0048] After passing through the inclined sieve plate 702, the solid powder is evenly dispersed, so that the solid powder falling into the solvent has a high dispersion degree, and the leaching process can be carried out more fully.

[0049] Further, the collecting cells 401, the discharge cell 403, and the overflow cell 404 are separated by a dividing plate 402 inside the collecting hopper 4. The oil collecting cell 501 is separated by a dividing plate 502 inside the oil collecting hopper 5. The discharge cell 403 and the overflow cell 404 are adjacent. An inlet pipe 8 is provided above the leaching vessel 1 corresponding to the collecting cell 401 adjacent to the other side of the discharge cell 403. A liquid inlet pipe 9 is provided above the leaching vessel 1 corresponding to the collecting cell 401 adjacent to the other side of the overflow cell 404. A liquid discharge pipe 503 is opened at the bottom of the oil collecting cell 501 corresponding to the lower part of the inlet pipe 8. The height of the dividing plate 502 gradually decreases starting from the overflow cell 404.

[0050] The collecting cell 401 is separated by a dividing plate 402 inside the collecting hopper 4.

[0051] Further, the oil collecting grid 501 is separated by a dividing plate 502 inside the oil collecting hopper 5.

[0052] Further, above the discharging grid 403, a feed pipe 8 is provided above the adjacent position on one side corresponding to the leaching grid 2, and a liquid inlet pipe 9 is provided above the adjacent position on the other side.

[0053] Further, the heights of the dividing plates 502 decrease in sequence. A liquid discharge pipe 503 is provided at the bottom of the oil collecting grid 501 formed by the lowest and the highest dividing plates 502, and the position of the oil collecting grid 501 formed by the lowest and the highest dividing plates 502 is at the corresponding position below the feed pipe 8.

[0054] Further, one end of the solid transportation and discharging device 11 is connected to the bottom of the discharging grid 403, and the other end of the solid transportation and discharging device 11 is connected to the solid removing or solvent recovering equipment.

[0055] A solvent replenishing pipe 10 is provided at the bottom outside the oil collecting grid 501. The top of the solvent replenishing pipe 10 is located above the leaching grid 2. A transport pump is provided on the solvent replenishing pipe 10, and the upper outlet of the solvent replenishing pipe 10 is arranged at a position far from the outer edge of the leaching grid 2. So that the replenishing solvent transported from the oil collecting grid 501 to the top of the leaching grid 2 can be fully mixed with the original solvent instead of overflowing directly from the outer edge of the leaching grid 2.

[0056] Taking the position below the setting position of the feed pipe 8 as the starting leaching grid 2, rotating in the direction opposite to the position of the lower discharging grid, after rotating one week, fresh solvent is replenished through the liquid inlet pipe 9 located in front of the overflowing discharging grid, realizing the use of the cleanest solvent to wash the cleanest material before discharging, countercurrent cleaning, and improving the leaching effect and leaching efficiency.

[0057] The solid transportation and discharging device 11 is a scraper conveyor.

[0058] The number of the leaching grids 2 is greater than or equal to the sum of the numbers of the aggregate grids 401 and the discharging grids 403, and the sum of the numbers of the aggregate grids 401 and the discharging grids 403 is at least three.

[0059] The aggregate hopper 4 is provided with at least two aggregate grids 401 and one discharging grid 403; the aggregate grids 401 and the discharging grids 403 do not need to be arranged corresponding to the upper leaching grids 2. The reduction of the numbers of the aggregate grids 401 and the discharging grids 403 can reduce the setting number of the solid transportation devices (scraper conveyors 7) and reduce the equipment cost.

[0060] The large number of the leaching grids 2 is to evenly disperse the circulating solid materials in multiple leaching grids 2 to avoid uneven distribution of solid powder, too thick or too thin material layers.

[0061] The number of the oil collecting grids 501 is at least two. At least two are required to form a countercurrent extraction of the solvent, and the number should not be too large to avoid making the equipment complex.

[0062] Working principle: Open the feed pipe 8 to inject the solid powder to be leached into the leaching compartment 2. The rotating shaft 6 is controlled by a motor to drive the leaching device 1 to rotate. The rotating direction of the leaching compartment 2 in the upper part of the leaching device 1 is the same as the direction in which the height of the partition plate 502 increases successively, while the direction of the discharging compartment 403 in the lower part is opposite. When the leaching device 1 rotates one circle and finally passes through the discharging and feeding compartment 403, the solid powder entering the leaching compartment 2 falls. Since there is no false bottom to block it, it directly enters the lower collecting compartment 401. As the solid powder continuously increases until it fills all the collecting compartments 401 and is slightly higher than the junction of the collecting hopper 4 and the leaching compartment 2 of the leaching device 1, at this time, open the liquid feed pipe to add the solvent into each leaching compartment 2 at a certain speed. Since the solid has sealed the junction of the collecting hopper 4 and the leaching device 1, the solvent only exists in the leaching device 1 above the collecting hopper 4. As the solvent is continuously added, after the leaching compartment 2 is filled, the solvent overflows downward from the outer edge of the top of the leaching compartment 2 into the oil collecting grid 501 of the oil collecting hopper 5. The solvent in the oil collecting grid 501 then passes upward through the solvent replenishing pipe 10 and falls from the top of the leaching compartment 2 to be replenished upward at a lower flow rate to increase the concentration of the substances extracted in the solvent and keep the solvent in each leaching compartment 2 in a relatively stationary state. The solvent in the oil collecting grid 501 overflows downward along the gradually decreasing partition plate 502 and finally reaches the oil collecting grid 501 formed by the lowest and highest baffles and is transported to the solvent recovery device for recovery at a fixed rate through the liquid discharge pipe 503. The liquid discharge pipe 503 is located directly below the feed pipe 8. The oil collecting grid 501 formed by the lowest and highest baffles is located directly below the feed pipe 8, where the saturation of the solvent is the highest. In this way, the solid powder newly added can be leached with the solvent with the highest saturation, thus realizing the countercurrent extraction of the solvent. The solid powder at the bottom of each collecting compartment 401 is continuously transported upward to the top of the leaching compartment 2 of the leaching device 1 by the scraper conveyor 7 at a certain transportation speed, and falls through the feeding port 701, passes through the inclined sieve plate 702, and the solid powder is evenly distributed, so that the solid powder falling into the solvent has a high dispersion degree, making the leaching process proceed more fully. The solid powder dispersed by the sieve plate 702 falls into the solvent in the leaching compartment 2, and the leaching is completed during the process of settling from top to bottom. Control the speed of the scraper conveyor to scrape the solid powder at the bottom so that the height of the piled solid powder always remains above the junction of the collecting hopper 4 and the leaching compartment 2 of the leaching device 1. The feeding port 701 of the scraper conveyor 7 corresponding to the collecting compartment 401 before the overflow compartment 404 transports a part of the solid powder to the overflow compartment 404 through the material dividing guide plate 703. The amount of the separated solid powder is based on the height of the solid powder in the overflow compartment 404 approaching the full grid, so that the solvent overflows, and at the same time, the height of the solid material in the collecting compartment 401 before the overflow compartment 404 cannot be lower than the junction of the collecting hopper 4 and the leaching compartment 2 of the leaching device 1. The solid powder in the overflow compartment 404 continues to rotate to the discharging compartment 403, and the leached solid powder is transported to the next process section through the solid transportation and discharging device 11.

[0063] Example 2

[0064] As Figures 1-4 shown in FIGS. 8-9, which is the same as Example 1, except that a branch solid return device 12 is provided on the solid transportation and discharging device 11, and the other end of the branch solid return device 12 is located directly above the overflow cell 404. The branch solid return device 12 is a scraper conveyor.

[0065] The lower part of the feeding port 701 of the scraper conveyor 7 on the aggregate cell 401 adjacent to the other side of the overflow cell 404 is not inclined with a material dividing guide plate 703; a part or all of the solid powder transported out of the discharging cell 403 is transported back to the overflow cell 404 by using the branch solid return device 12, and similarly, the amount of solid powder is based on the height of the solid powder in the overflow cell 404 being close to full, so as to realize the function of solvent overflow in the overflow cell 404.

Claims

1. An efficient and low-wear leaching device, characterized in that, It includes a leaching tank (1). A rotating shaft (6) is arranged at the center inside the leaching tank (1). A number of leaching compartments (2) are separated by a separating plate (3) connecting the rotating shaft (6) and the inner wall of the leaching tank (1). A collecting hopper (4) with the same cross-sectional area as the leaching tank (1) is arranged at the bottom of the leaching tank (1). The collecting hopper (4) is provided with a number of collecting grids (401), a discharge grid (403) and an overflow grid (404). An oil collecting hopper (5) is arranged outside the collecting grids (401) and the overflow grid (404). An oil collecting grid (501) is arranged inside the oil collecting hopper (5). One end of a solid transportation device is connected to the bottom of each collecting grid (401) and the overflow grid (404), and the other end of the solid transportation device is located above the top leaching compartment (2).

2. The high-efficiency and low-wear leaching device according to claim 1, characterized in that, The solid transportation device is a scraper conveyor (7), and a feeding opening (701) is arranged at the position directly above the leaching compartment (2) of the scraper conveyor (7).

3. The high-efficiency and low-wear leaching device according to claim 2, characterized in that, A sieve plate (702) is arranged obliquely downward in front of the feeding opening (701).

4. The high-efficiency and low-wear leaching device according to claim 2, wherein, The collecting grids (401), the discharge grid (403) and the overflow grid (404) are separated by a material dividing plate (402) inside the collecting hopper (4). The oil collecting grid (501) is separated by a grid dividing plate (502) inside the oil collecting hopper (5). The discharge grid (403) and the overflow grid (404) are adjacent. An inlet pipe (8) is arranged above the leaching tank (1) corresponding to the collecting grid (401) adjacent to the other side of the discharge grid (403). A liquid inlet pipe (9) is arranged above the leaching tank (1) corresponding to the collecting grid (401) adjacent to the other side of the overflow grid (404). A liquid discharge pipe (503) is opened at the bottom of the oil collecting grid (501) corresponding to the lower part of the inlet pipe (8). The height of the grid dividing plate (502) decreases successively starting from the overflow grid (404). One end of a solid transportation and discharging device (11) is connected to the bottom of the discharge grid (403), and the other end of the solid transportation and discharging device (11) is connected to a solid removing or solvent recovering device.

5. The high-efficiency and low-wear leaching device according to claim 4, characterized in that A branch solid return device (12) is arranged on the solid transportation and discharging device (11), and the other end of the branch solid return device (12) is located directly above the overflow grid (404).

6. The high-efficiency and low-wear leaching device according to claim 4, wherein, A solvent replenishing pipe (10) is arranged at the outer bottom of the oil collecting grid (501). The top of the solvent replenishing pipe (10) is located above the leaching compartment (2). A transportation pump is arranged on the solvent replenishing pipe (10), and the upper outlet of the solvent replenishing pipe (10) is arranged at a position far from the outer edge of the leaching compartment (2).

7. The high-efficiency and low-wear leaching device according to claim 1, wherein, The number of the leaching compartments (2) is greater than or equal to the sum of the numbers of the collecting grids (401), the overflow grid (404) and the discharge grid (403), and the sum of the numbers of the collecting grids (401), the overflow grid (404) and the discharge grid (403) is at least three.

8. The high-efficiency and low-wear leaching device according to claim 1, wherein The number of the oil collecting grids (501) is at least two.

9. The high-efficiency and low-wear leaching device according to claim 4, wherein, Below the discharge opening (701) of the scraper conveyor (7) on the aggregate bin (401) adjacent to the other side of the overflow bin (404), a material distribution guide plate (703) is inclined, and the inclination direction of the material distribution guide plate (703) faces the top inlet of the dipping bin (2) above the direction where the overflow bin (404) is located.

Images