Chromium recovery leach separation plant

Abstract

This invention relates to the field of chromium recovery equipment technology, specifically a chromium recovery leaching and separation device, including a reactor body. The upper and lower surfaces of the reactor body are equipped with inlet and outlet components. A heating component is installed inside the reactor body. A rotating block is rotatably connected to the top of the reactor body via a bearing. A driving component is fixedly connected to the rotating block and the upper surface of the reactor body. Four fixing holes are drilled through the rotating block, and fixing rods are slidably connected to each of the four fixing holes. Three movable fixing rods, along with threaded grooves and locking bolts, flexibly adjust the height of the four filter screens, achieving three-dimensional layered stirring during leaching. Combined with embedded heating coils for temperature and pressure control, this ensures efficient chromium conversion and leaching. After leaching, the filter screens are quickly assembled into a disc, descending simultaneously for "squeezing + filtration." A dedicated extraction hole is used to extract the filtrate, avoiding secondary contamination and significantly improving filtrate purity and separation efficiency.

Description

Technical Field

[0001] This invention relates to the field of chromium recovery equipment technology, specifically to a chromium recovery leaching and separation device. Background Technology

[0002] In the field of resource recovery and treatment of chromium-containing solid wastes such as electroplating sludge, chromium slag, and smelting tailings, alkaline leaching oxidation has become the mainstream process in the industry due to its significant advantages of high selectivity for chromium, low leaching of impurity metals, and low difficulty in subsequent purification. It is widely used in industrial chromium salt preparation, heavy metal pollution control and other scenarios.

[0003] Traditional equipment often features a single-height stirring mechanism, which can easily lead to localized sedimentation of the slurry, uneven solid-liquid contact, and consequently incomplete reaction or excessive oxidation, reducing the chromium leaching rate. Furthermore, leaching and solid-liquid separation are often separate devices, resulting in lengthy processes, large footprints, and the risk of secondary contamination of the filtrate. Traditional filtration can only perform simple screening and is unable to retain fine impurities, increasing the load on subsequent purification. Some integrated devices require disassembly of components for function switching, which is cumbersome to operate and has high maintenance costs, making it difficult to adapt to different chromium-containing solid waste treatment needs. Therefore, it is necessary to propose a chromium recovery leaching separation device. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a chromium recovery leaching separation device.

[0005] The technical solution adopted by this invention to solve its technical problem is: a chromium recovery leaching separation device, including a reactor body, with inlet and outlet components provided on the upper and lower surfaces of the reactor body, a heating component provided inside the reactor body, a rotating block rotatably connected to the top of the reactor body via a bearing, a drive component fixedly connected to the rotating block and the upper surface of the reactor body, four fixing holes penetrating the rotating block, and fixing rods slidably connected in each of the four fixing holes, the lower ends of the four fixing rods extending into the reactor body and fixedly connected to a filter screen plate in each; the reactor body... A lifting assembly is fixedly connected to the upper surface of the reactor. A connecting block is rotatably connected to the lifting assembly via a bearing. Four connecting holes are opened through the connecting block. The upper ends of the four fixed rods are respectively opened through the four connecting holes and extend upward. One of the fixed rods is opened through a pull-out hole. The other three fixed rods have first threaded grooves on their rod walls inside the connecting holes. The other three fixed rods have second threaded grooves on their rod walls inside the reactor body. The walls of the other three connecting holes are all opened through threaded holes. The three first threaded grooves and the three threaded holes are all threadedly connected to a locking bolt.

[0006] Specifically, the feeding and discharging assembly includes a feed pipe and a discharge pipe. The feed pipe is fixedly installed on the upper surface of the reactor body, and the discharge pipe is fixedly installed on the lower surface of the reactor body. One end of both the feed pipe and the discharge pipe is connected to the interior of the reactor body, and the other end of both the feed pipe and the discharge pipe extends to the outside of the reactor body. A control valve is fixedly installed at the end of the discharge pipe located outside the reactor body.

[0007] Specifically, the heating assembly includes a mounting cavity, which is formed on the inner wall of the reactor body, and a heating coil is fixedly installed inside the mounting cavity.

[0008] Specifically, the drive assembly includes a drive motor and a first bevel gear. The drive motor is fixedly mounted on the upper surface of the reactor body. The first bevel gear is fixedly sleeved on one end of the rotating block located outside the reactor body. The output end of the drive motor is fixedly connected to a second bevel gear through a coupling. The first bevel gear and the second bevel gear mesh with each other.

[0009] Specifically, the lifting assembly includes two driving cylinders, which are fixedly installed on the upper surface of the reactor body. Each driving cylinder has a piston rod movably connected to its output end. The upper ends of the two piston rods are fixedly connected to a support plate. The lower surface of the support plate is fixedly connected to two support rods. The lower ends of the two support rods are fixedly connected to a connecting plate. The connecting block is rotatably connected to the connecting plate via a bearing.

[0010] Specifically, the fixed rod is fixedly connected to the rod wall inside the reactor vessel, and the other end of the stirring rod is fixedly connected to the filter screen plate.

[0011] Specifically, one of the fixing rods is fixedly connected to one of the connecting holes.

[0012] Specifically, the upper opening of the extraction hole is set through the upper surface of one of the fixing rods, and the lower opening of the extraction hole is opened through the rod wall of one of the fixing rods at a position cm above the filter screen.

[0013] The beneficial effects of this invention are as follows: The chromium recovery leaching separation device of this invention, through the precise cooperation of three movable fixing rods with the first threaded groove, the second threaded groove, and the locking bolt, allows for flexible adjustment of the height of the four filter screens. During the leaching stage, it enables three-dimensional layered stirring of the slurry, avoiding localized deposition and significantly improving the uniformity of solid-liquid contact. Combined with the low-temperature constant-temperature heating and heat preservation and pressure stabilization functions of the heating coil embedded in the inner wall of the reaction vessel, it provides a stable and controllable environment for the alkaline leaching oxidation reaction, accelerating the conversion of trivalent chromium to hexavalent chromium. Simultaneously, the strong alkaline system and the slow addition of the oxidant process are suitable for… The design effectively avoids incomplete reaction or excessive oxidation, ensuring stable dissolution of sodium chromate. After leaching, the lifting components and locking bolts work together to quickly assemble the four filter screens into a complete disc shape that fits tightly against the inner wall of the reactor. During the descent, the dual functions of "squeezing + filtering" are achieved simultaneously, compacting the slag to the bottom of the reactor and efficiently trapping fine impurities. Combined with the dedicated extraction hole 5cm above the filter screen, the filtered chromium-containing alkaline filtrate can be directly extracted, avoiding secondary pollution and significantly improving the purity and separation efficiency of the filtrate. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the external structure of the chromium recovery leaching separation device provided by the present invention; Figure 2 An internal cross-sectional view of the extrusion filtration implementation state of the chromium recovery leaching separation device provided by the present invention; Figure 3 An internal cross-sectional view of the chromium recovery leaching separation apparatus provided by the present invention in the pre-processing state of extrusion filtration; Figure 4 An internal cross-sectional view of the stirring and heating reaction state of the chromium recovery leaching separation device provided by the present invention; Figure 5 A schematic diagram of the connection structure between the lifting assembly and the connecting block of the chromium recovery leaching separation device provided by the present invention; Figure 6 A schematic diagram of the connection structure between the rotating block, the fixed rod, and the filter screen plate of the chromium recovery leaching separation device provided by the present invention; Figure 7 A schematic diagram of the connection structure between the fixing rod and the filter screen plate of the chromium recovery leaching separation device provided by the present invention.

[0016] In the diagram: 1. Reactor body; 2. Rotating block; 3. Fixing hole; 4. Fixing rod; 5. Filter screen; 6. Connecting block; 7. Connecting hole; 8. Extraction hole; 9. First threaded groove; 10. Second threaded groove; 11. Threaded hole; 12. Locking bolt; 13. Feed pipe; 14. Discharge pipe; 15. Control valve; 16. Stirring rod; 17. Mounting cavity; 18. Heating coil; 19. Drive motor; 20. First bevel gear; 21. Second bevel gear; 22. Drive cylinder; 23. Piston rod; 24. Support plate; 25. Support rod; 26. Connecting plate. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] like Figures 1-7 As shown, the present invention provides the following technical solution: Example 1: A chromium recovery leaching separation device includes a reactor body 1. Feeding and discharging components are installed on the upper and lower surfaces of the reactor body 1. A heating component is installed inside the reactor body 1. A rotating block 2 is rotatably connected to the top of the reactor body 1 via a bearing. A driving component is fixedly connected to the rotating block 2 and the upper surface of the reactor body 1. Four fixing holes 3 are formed through the rotating block 2. Fixing rods 4 are slidably connected to each of the four fixing holes 3. The lower ends of the four fixing rods 4 extend into the reactor body 1 and are fixedly connected to filter screens 5. A lifting mechanism is fixedly connected to the upper surface of the reactor body 1. The lifting assembly is rotatably connected to a connecting block 6 via a bearing. The connecting block 6 has four connecting holes 7. The upper ends of four fixing rods 4 pass through the four connecting holes 7 and extend upward. One of the fixing rods 4 has a pull-out hole 8. The other three fixing rods 4 have first threaded grooves 9 on their rod walls inside the connecting holes 7. The other three fixing rods 4 have second threaded grooves 10 on their rod walls inside the reactor body 1. The other three connecting holes 7 have threaded holes 11. The three first threaded grooves 9 and the three threaded holes 11 are all threadedly connected to a locking bolt 12.

[0019] The feeding and discharging assembly includes a feed pipe 13 and a discharge pipe 14. The feed pipe 13 is fixedly installed on the upper surface of the reactor body 1, and the discharge pipe 14 is fixedly installed on the lower surface of the reactor body 1. One end of the feed pipe 13 and the discharge pipe 14 are connected to the inside of the reactor body 1, and the other end of the feed pipe 13 and the discharge pipe 14 extend to the outside of the reactor body 1. A control valve 15 is fixedly installed on the end of the discharge pipe 14 located outside the reactor body 1.

[0020] The heating component includes a mounting cavity 17, which is located on the inner wall of the reactor body 1. A heating coil 18 is fixedly installed inside the mounting cavity 17.

[0021] The drive assembly includes a drive motor 19 and a first bevel gear 20. The drive motor 19 is fixedly installed on the upper surface of the reactor body 1. The first bevel gear 20 is fixedly sleeved on the end of the rotating block 2 located outside the reactor body 1. The output end of the drive motor 19 is fixedly connected to a second bevel gear 21 through a coupling. The first bevel gear 20 and the second bevel gear 21 mesh with each other.

[0022] The lifting assembly includes two drive cylinders 22, which are fixedly installed on the upper surface of the reactor body 1. Each drive cylinder 22 has a piston rod 23 movably connected to its output end. The upper ends of the two piston rods 23 are fixedly connected to a support plate 24. The lower surface of the support plate 24 is fixedly connected to two support rods 25. The lower ends of the two support rods 25 are fixedly connected to a connecting plate 26. The connecting block 6 is rotatably connected to the connecting plate 26 via a bearing.

[0023] Among them, the fixed rod 4 is fixedly connected to the rod wall inside the reactor body 1, and the stirring rod 16 is set in an inclined position. The other end of the stirring rod 16 is fixedly connected to the filter screen plate 5.

[0024] One of the fixing rods 4 is fixedly connected to one of the connecting holes 7.

[0025] The upper opening of the extraction hole 8 is set through the upper surface of one of the fixing rods 4, and the lower opening of the extraction hole 8 is opened through the rod wall of one of the fixing rods 4 located 5cm above the filter screen plate 5.

[0026] When using it, the following steps are included: First, pull up the three movable fixing rods 4 to align the second threaded groove 10 on the fixing rod 4 with the threaded hole 11. Then rotate the locking bolt 12 to connect the locking bolt 12 with the threaded hole 11 and the second threaded groove 10. This allows the connecting plate 26 to support the connecting block 6, and the connecting block 6 to support the fixing rods 4, thereby adjusting the three adjustable fixing rods 4 to different heights. The stationary fixing rod 4 and the three adjusted fixing rods 4 together move the filter screen plate 5 to different heights inside the reactor body 1. The second step involves crushing and grinding the chromium-containing waste residue, then feeding it into a slurry mixing tank. Production wastewater / clean water is added to prepare the slurry, and the solid-liquid ratio is controlled to ensure the fluidity of the slurry. Then, sodium hydroxide alkaline agent is stirred and mixed into the chromium-containing slurry to create a strongly alkaline reaction environment, dissolve some silicate impurities, loosen the material structure, and create conditions for the dissociation of chromium. Finally, the slurry is injected into the reactor body 1 through the feed pipe 13. The third step involves synchronizing the drive motor 19 and the heating coil 18. The drive motor 19 drives the second bevel gear 21 to rotate, and the first bevel gear 20, through meshing with the second bevel gear 21, rotates. The first bevel gear 20 then drives the rotating block 2 to rotate, which in turn drives the fixing rod 4 to rotate through the fixing hole 3. The fixing rod 4 drives the four filter screens 5 and the stirring rod 16 to rotate at different heights to stir the chromium-containing slurry. Simultaneously, the heating coil 18 heats the chromium-containing slurry at a low temperature to maintain a constant reaction temperature, enhance solid-liquid contact, and accelerate the precipitation and mass transfer of chromium inside the material. Step 4: Slowly add oxidant (hydrogen peroxide, sodium hypochlorite, air / oxygen, etc.) into reactor body 1 through feed pipe 13 to oxidize the difficult-to-dissolve trivalent chromium in the material into hexavalent chromium that can be dissolved in alkaline solution, forming sodium chromate that is completely dissolved in the solution; then keep the temperature and pressure stable for a period of time to allow the chromium to dissolve as much as possible, improving the overall recovery and leaching efficiency. After the reaction is completed, stop adding chemicals and heating, let it cool naturally and stand for a short time to complete the entire alkaline leaching and oxidation process, and obtain an alkaline slurry mixture containing soluble chromium. Step 5: First, rotate the locking bolt 12 to disengage it from the second threaded groove 10, and disconnect the connecting block 6 from the three fixed rods 4 and the filter screen plate 5. Then, start the drive cylinder 22, which drives the piston rod 23 to rise. The piston rod 23 will drive the support plate 24 to rise, and the support plate 24 will drive the connecting plate 26 to rise through the support rod 25. The connecting plate 26 will drive the connecting block 6 to rise, and the connecting block 6 will drive one of the filter screen plates 5 to rise to the top of the reactor body 1 through the fixed rod 4. Then, pull the other three fixed rods 4 upwards and align the first threaded groove 9 on the other three fixed rods 4 with the threaded hole 11. Then, rotate the locking bolt 12 again to enter the first threaded groove 9, so that the connecting block 6 is fixedly connected to the fixed rod 4, and the fixed rod 4 and the filter screen plate 5 are fixed and supported. The four filter screen plates 5 together form a disc-shaped filter screen plate 5 at the top of the reactor body 1, and are attached to the inner wall of the reactor body 1. Step 6: Start the drive cylinder 22. The drive cylinder 22 drives the piston rod 23 to descend, which in turn drives the support plate 24 to descend. The support plate 24, through the support rod 25, drives the connecting plate 26 to descend, which in turn drives the connecting block 6 to descend. The connecting block 6, through the fixing rod 4, drives the disc-shaped filter screen plate 5 to descend, thus squeezing and filtering the alkaline slurry mixture in the reactor body 1. This causes the slag to remain below the filter screen plate 5 and be pushed to collect at the bottom of the reactor body 1, while the chromium-containing alkaline filtrate is filtered by the filter screen plate 5 and remains above it. Then, the extraction hole 8 can be connected to an external extraction device, and the chromium-containing alkaline filtrate can be extracted through the extraction hole 8 and transported to the neutralization and precipitation process for adjustment. Chromium hydroxide product is precipitated.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chromium recovery leaching and separation device, comprising a reactor body (1), characterized in that, The upper and lower surfaces of the reactor body (1) are provided with inlet and outlet components. The reactor body (1) is provided with a heating component. The top of the reactor body (1) is rotatably connected to a rotating block (2) via a bearing. The rotating block (2) and the upper surface of the reactor body (1) are fixedly connected to a driving component. The rotating block (2) has four through holes (3). Each of the four holes (3) is slidably connected to a fixing rod (4). The lower ends of the four fixing rods (4) extend into the reactor body (1) and are fixedly connected to a filter screen plate (5). The upper surface of the reactor body (1) is fixedly connected to a lifting component. The lifting component is rotatably connected to a bearing. A connecting block (6) is connected, and four connecting holes (7) are opened through the connecting block (6). The upper ends of the four fixing rods (4) are respectively opened through the four connecting holes (7) and extend upward. One of the fixing rods (4) is opened through the extraction hole (8). The other three fixing rods (4) are opened with first threaded grooves (9) on the rod wall inside the connecting holes (7). The other three fixing rods (4) are opened with second threaded grooves (10) on the rod wall inside the reactor body (1). The other three connecting holes (7) are all opened through the hole wall with threaded holes (11). The three first threaded grooves (9) and the three threaded holes (11) are all threadedly connected with locking bolts (12).

2. The chromium recovery leaching separation device according to claim 1, characterized in that: The feeding and discharging assembly includes a feed pipe (13) and a discharge pipe (14). The feed pipe (13) is fixedly installed on the upper surface of the reactor body (1), and the discharge pipe (14) is fixedly installed on the lower surface of the reactor body (1). One end of the feed pipe (13) and the discharge pipe (14) are connected to the inside of the reactor body (1), and the other end of the feed pipe (13) and the discharge pipe (14) extend to the outside of the reactor body (1). A control valve (15) is fixedly installed at the end of the discharge pipe (14) located outside the reactor body (1).

3. The chromium recovery leaching separation device according to claim 1, characterized in that: The heating assembly includes a mounting cavity (17), which is located on the inner wall of the reactor body (1). A heating coil (18) is fixedly installed inside the mounting cavity (17).

4. The chromium recovery leaching separation device according to claim 1, characterized in that: The drive assembly includes a drive motor (19) and a first bevel gear (20). The drive motor (19) is fixedly installed on the upper surface of the reactor body (1). The first bevel gear (20) is fixedly sleeved on the end of the rotating block (2) located outside the reactor body (1). The output end of the drive motor (19) is fixedly connected to a second bevel gear (21) through a coupling. The first bevel gear (20) and the second bevel gear (21) mesh with each other.

5. The chromium recovery leaching separation apparatus according to claim 1, characterized in that: The lifting assembly includes two driving cylinders (22), which are fixedly installed on the upper surface of the reactor body (1). Each driving cylinder (22) is movably connected to a piston rod (23) at its output end. The upper ends of the two piston rods (23) are fixedly connected to a support plate (24). The lower surface of the support plate (24) is fixedly connected to two support rods (25). The lower ends of the two support rods (25) are fixedly connected to a connecting plate (26). The connecting block (6) is rotatably connected to the connecting plate (26) via a bearing.

6. The chromium recovery leaching separation apparatus according to claim 1, characterized in that: The fixed rod (4) is fixedly connected to the rod wall inside the reactor body (1) with an inclined stirring rod (16), and the other end of the stirring rod (16) is fixedly connected to the filter screen plate (5).

7. The chromium recovery leaching separation apparatus according to claim 1, characterized in that: One of the fixed rods (4) is fixedly connected to one of the connecting holes (7).

8. The chromium recovery leaching separation apparatus according to claim 1, characterized in that: The upper opening of the extraction hole (8) is set through the upper surface of one of the fixed rods (4), and the lower opening of the extraction hole (8) is opened through the rod wall of one of the fixed rods (4) located 5cm above the filter screen plate (5).

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