A device for continuous stripping and crystallization

Abstract

The utility model provides a kind of continuous back extraction crystallization's device, belong to hydrometallurgy extraction and crystallization technical field, including a kind of continuous back extraction crystallizer, crystallizer inside is provided with fixed flow guide barrel, adjustable flow guide barrel and crystallization barrel, for the back extraction and solution crystallization of load organic phase.The utility model is by designing a new type of organic back extraction automatic continuous crystallization device by load organic phase pipe, circulating back extraction liquid pipe, flow guide barrel, crystallization barrel, crystal collection barrel, organic phase overflow weir tank, flow partition plate etc. Component constitutes, can realize the ion of organic load high-efficiently, fast continuous direct generation as corresponding metal salt crystal, dispense with traditional evaporation crystallization procedure, greatly save steam and electric energy, with good development prospect.

Description

Technical Field

[0001] This utility model relates to a novel hydrometallurgical extraction and crystallization separation technology, specifically a continuous back-extraction crystallization apparatus. Background Technology

[0002] In hydrometallurgical processes for many metals such as nickel and cobalt, the common practice is to extract and purify the metal by back-extracting the supported organic phase with acid to obtain a pure metal salt solution. This solution is then concentrated and crystallized through evaporation to yield the corresponding metal salts. However, the evaporation process consumes significant amounts of steam and electricity, increasing production costs and requiring substantial investment. Therefore, finding a process technology and equipment that reduces the energy consumption and investment associated with traditional crystallization is a key direction for the industry's development.

[0003] Based on this, this application provides an apparatus for continuous back-extraction crystallization. Utility Model Content

[0004] The purpose of this invention is to provide an apparatus for continuous back-extraction crystallization.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A continuous back-extraction crystallization apparatus includes a barrel and a crystal collection barrel, which are connected vertically to form the main body of the apparatus. A fixed support is installed on the top of the barrel, and a flow-guiding stirring motor is installed on the support. The output end of the flow-guiding stirring motor is connected to a lifting flow-guiding stirring rod through a flow-guiding stirring reducer. A flow-guiding barrel is set on the outside of the flow-guiding stirring rod. Loaded organic inlet pipes and back-extraction acid pipes are respectively set on both sides of the flow-guiding stirring motor on the barrel and connected to the barrel body. A crystallization barrel is set on the outside of the flow-guiding barrel. An oil-water separation weir is fixed on the top of the inner wall of the barrel, and an empty organic overflow pipe is connected to the oil-water separation weir and connected to the outside of the barrel body.

[0007] As a further embodiment of this utility model: the guide barrel consists of a fixed guide barrel and an adjustable guide barrel. The adjustable guide barrel is vertically slidably connected to the bottom of the fixed guide barrel, and an adjusting screw is connected to the outside of the barrel. The adjusting screw is threadedly connected to the adjusting handwheel at the top of the barrel.

[0008] As a further embodiment of this utility model: the loaded organic inlet pipe and the back-extraction acid pipe are connected to the fixed guide barrel.

[0009] As a further embodiment of this utility model, a baffle plate is installed between the crystallization tank and the outer tank wall.

[0010] As a further embodiment of this invention, a cooling coil is installed in the crystal collection tank.

[0011] As a further embodiment of this utility model: the loaded organic inlet pipe, the back-extraction pipe, and the unloaded organic overflow pipe are made of polytetrafluoroethylene lined or other acid-resistant and low-surface-roughness materials. Beneficial effects

[0012] This invention combines extraction and back-extraction with crystal crystallization. It utilizes the temperature rise from the acid-base reaction during the back-extraction of a saturated back-extraction solution and a loaded organic solution to increase the temperature of the back-extraction solution, thereby increasing the solubility of metal ions in the solution. Fine-grained crystals circulate and grow within the guide tank and crystallizer. By adjusting the vertical position of the adjustable guide tank, the upward suction force of the guide stirring rod on the back-extraction solution and fine crystals is balanced with the gravity of crystals of different sizes in the back-extraction solution, thus achieving gravity-based crystal sorting. A cooling coil cools the back-extraction solution by dissipating the heat generated by the back-extraction reaction. Metal salts in the back-extraction solution precipitate out due to decreased solubility and circulate and crystallize. This continuous back-extraction crystallization apparatus eliminates the need for solution evaporation and concentration, significantly saving energy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a vertical cross-sectional view of the present invention.

[0015] Figure 3 This is a cross-sectional view of the present invention.

[0016] Figure 1-3 The components are as follows: 1. Guided flow stirring motor; 2. Guided flow stirring reducer; 3. Loaded organic inlet pipe; 4. Guided flow stirring rod; 5. Adjustable guide flow tank; 6. Tank body; 7. Adjusting screw; 8. Back-extraction acid pipe; 9. Adjusting handwheel; 10. Oil-water separation weir; 11. Fixed guide flow tank; 12. Unloaded organic overflow pipe; 13. Baffle plate; 14. Crystallization tank; 15. Cooling coil; 16. Crystal collection tank. Detailed Implementation

[0017] The following description, in conjunction with the accompanying drawings of this utility model, will be presented... Figures 1-3 The specific technical solution of this utility model will be clearly and completely described.

[0018] Please see Figures 1-3 , Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a vertical cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the present invention.

[0019] This embodiment provides a continuous back-extraction crystallization apparatus, including a barrel 6 at the top of the apparatus, a crystal collection barrel 16 connected to the bottom of the barrel 6, a fixed guide barrel 11 and a crystallization barrel 14 fixedly installed inside the barrel 6, a fixed bracket installed at the top of the barrel 6, a guide stirring motor 1 installed on the bracket, the output end of the guide stirring motor 1 connected to a lifting guide stirring rod 4 through a guide stirring reducer 2, a guide barrel provided on the outside of the guide stirring rod 4, and negative pressure filters respectively provided on both sides of the guide stirring motor 1 on the barrel 6. The organic inlet pipe 3 and the back-extraction acid pipe 8 are connected to the inside of the tank 6. A crystallization tank 14 is set on the outside of the guide tank. An oil-water separation weir 10 is fixed on the top of the inner wall of the tank 6. An empty organic overflow pipe 12 is connected to the oil-water separation weir 10 and connects to the outside of the tank 6. The guide tank consists of a fixed guide tank 11 and an adjustable guide tank 5. The adjustable guide tank 5 is vertically slidably connected to the bottom of the fixed guide tank 11. An adjusting screw 7 is connected to the outside of the adjusting guide tank. The adjusting screw 7 is threadedly connected to the adjusting handwheel 9 on the top of the tank 6. The guide stirring rod 4 fully mixes the organic phase and acid solution and lifts it to overflow from the top of the fixed guide tank 11 into the crystallization tank 14.

[0020] A baffle plate 13 is installed between the crystallization tank 14 and the outer tank wall to separate the organic liquid and reduce the flow rate. The light phase, the unloaded organic phase, floats to the surface and enters the unloaded organic overflow pipe 12 through the oil-water separation weir 10, returning to the extraction production line. The heavy phase, the supersaturated salt solution, enters the lower part of the crystal collection tank 16.

[0021] Cooling coils 15 are installed in the crystal collection tank 16 to cool the high-temperature supersaturated salt solution and promote further crystallization. Lighter, finer crystals are circulated to the crystallization tank 14 via the adjustable guide tank 5 and the lifting guide stirring rod 4, where they repeatedly crystallize and grow. The grown, coarser crystals settle at the bottom of the crystal collection tank 16 and are discharged to the crystal centrifuge via the discharge valve. The centrifugal mother liquor is returned to prepare back-extraction acid and then pumped back into the fixed guide tank 11 for loading organic back-extraction.

[0022] The materials of the loaded organic inlet pipe 3, the back-extraction acid pipe 8, and the unloaded organic overflow pipe 12 in the equipment are lined with polytetrafluoroethylene or other acid-resistant and low-surface-roughness materials.

[0023] In implementing the technical solution described in this embodiment, the metal-loaded organic phase enters the fixed guide tank 11 through the loaded organic inlet pipe 3. After cooling the crystallization mother liquor and mixing it with the back-extraction acid, the mixture also enters the fixed guide tank 11 through the back-extraction acid pipe 8. The guide stirring motor 1 and the guide stirring reducer 2 drive the guide stirring rod 4 to fully react the back-extraction acid solution and the loaded organic phase in the guide tank. Ions from the loaded organic phase are transferred to the back-extraction acid solution, causing the salt concentration in the back-extraction solution to exceed its saturation solubility. The cooling coil 15 installed in the crystal collection tank 16 cools the high-temperature supersaturated salt solution, further promoting crystallization. The coarse crystallized particles settle at the bottom of the crystal collection tank 16 and are discharged to the crystal centrifuge through the discharge valve. Lighter, finer crystals are circulated and lifted to the crystallization tank 14 via the adjustable guide tank 5 and the lifting guide stirring rod 4, where they crystallize and grow. Meanwhile, the mixture of organic phase overflowing from the fixed guide tank 11 and the back-extracting salt enters the crystallization tank 14, where oil-water separation is achieved by controlling the flow rate through the baffle plate 13. The less dense, unloaded organic phase separates and settles with the denser salt solution in the crystallization tank 14. The unloaded organic phase then flows through the oil-water separation weir 10 into the unloaded organic overflow pipe 12, returning to the extraction production line.

Claims

1. An apparatus for continuous back-extraction crystallization, characterized in that, include: The barrel (6) and the crystal collection barrel (16) are connected vertically to form the main body of the device. A fixed bracket is installed on the top of the barrel (6), and a flow-guiding stirring motor (1) is installed on the bracket. The output end of the flow-guiding stirring motor (1) is connected to a lifting flow-guiding stirring rod (4) through a flow-guiding stirring reducer (2). A flow-guiding barrel is set on the outside of the flow-guiding stirring rod (4). Loaded organic inlet pipe (3) and back-extraction acid pipe (8) are respectively set on both sides of the flow-guiding stirring motor (1) on the barrel (6) and connected to the inside of the barrel (6). A crystallization barrel (14) is set on the outside of the flow-guiding barrel. An oil-water separation weir (10) is fixed on the top of the inner wall of the barrel (6). An empty organic overflow pipe (12) is connected to the oil-water separation weir (10) and connected to the outside of the barrel (6).

2. The apparatus for continuous back-extraction crystallization according to claim 1, characterized in that: The guide barrel consists of a fixed guide barrel (11) and an adjustable guide barrel (5). The adjustable guide barrel (5) is vertically slidably connected to the bottom of the fixed guide barrel (11), and an adjusting screw (7) is connected to the outside. The adjusting screw (7) is threadedly connected to the adjusting handwheel (9) at the top of the barrel body (6).

3. The apparatus for continuous back-extraction crystallization according to claim 2, characterized in that: The loaded organic inlet pipe (3) and the back-extraction acid pipe (8) are connected to the fixed guide bucket (11).

4. The apparatus for continuous back-extraction crystallization according to claim 1, characterized in that: A baffle plate (13) is installed between the crystallization tank (14) and the outer tank wall.

5. The apparatus for continuous back-extraction crystallization according to claim 1, characterized in that: Cooling coils (15) are installed in the crystal collection tank (16).

6. The apparatus for continuous back-extraction crystallization according to claim 1, characterized in that: The loaded organic inlet pipe (3), the back-extraction pipe (8), and the unloaded organic overflow pipe (12) are made of polytetrafluoroethylene lining or other acid-resistant and low-surface-roughness materials.

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