Reverse extraction automatic decalcification device

Abstract

The utility model discloses a reverse extraction automatic decalcification device, which belongs to the technical field of hydrometallurgy extraction and solid-liquid separation, and comprises a clarifying tank, an arc collector fixed in the middle of the interior of the clarifying tank, an ultrasonic vibration rod mounted right above the arc collector in an abutting manner, and a spiral scraper arranged on one side of the exterior of the clarifying tank, a scraper shaft rotationally connected with the inner wall of the clarifying tank is fixedly mounted at the output end of the spiral scraper, scraper blades are welded on the peripheral wall of the scraper shaft, and a liquid phase return pipe is inserted into the top of the clarifying tank; the novel reverse extraction automatic decalcification device composed of the arc collector, the spiral scraper, the calcium slag filter press, the liquid phase return pipe and the like is designed, so that the calcium slag can be efficiently separated into an extraction system, and the problems that in the existing production process, a large amount of calcium slag is enriched in a P204 extraction section, so that a pipeline is blocked, the production efficiency is low, and the like are solved. And the normal operation of an extraction system is seriously influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrometallurgical extraction and solid-liquid separation, in particular to a device for automatic decalcification by back extraction. Background Art

[0002] In the wet smelting technology of many metals such as nickel and cobalt, sulfuric acid leaching is mostly used. The leached sulfuric acid solution adopts the process technology of P204 extraction, purification and impurity removal. The calcium element in the pre-extraction liquid will also be extracted into the organic phase by the P204 extractant. In order to prevent the stripping to generate calcium slag and affect production, hydrochloric acid stripping is generally used in the stripping process. The stripping solution formed is calcium chloride. Calcium chloride is soluble, so there is no precipitation of calcium slag in the stripping system. However, due to the use of hydrochloric acid stripping, the organic phase needs to be continuously switched between the chloride system and the sulfate system, which produces a large amount of wash water and chlorine-containing stripping solution, which increases the wastewater treatment capacity of the system.

[0003] When sulfuric acid is used as a stripping agent, the calcium in the organic phase reacts with sulfuric acid to form calcium sulfate. However, calcium sulfate has a low solubility and is easily precipitated. The precipitated calcium sulfate adheres to the extraction tank, and large-scale calcium slag is quickly accumulated, causing pipeline blockage and phase separation difficulties, which seriously affects the extraction process. The machine needs to be shut down every three or four days to manually clean the calcium slag in the extraction tank, which seriously affects the normal operation of the extraction system.

[0004] In order to reduce the amount of wastewater generated by the hydrochloric acid stripping process and avoid the calcium slag produced by sulfuric acid stripping that seriously affects the production of the extraction system, it is urgent to develop a new process technology device to solve this problem. Utility Model Content

[0005] The main purpose of the utility model is to provide a device for automatic decalcification by back extraction.

[0006] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0007] A device for automatic decalcification by stripping comprises a clarification tank, wherein an arc collector is fixed in the middle of the clarification tank, an ultrasonic vibrating rod is installed in abutment with the arc collector directly above the arc collector, a spiral scraper is arranged on one side outside the clarification tank, a scraper shaft rotatably connected to the inner wall of the clarification tank is fixedly installed on the output end of the spiral scraper, scraper blades are welded on the outer wall of the scraper shaft, a liquid phase return pipe is inserted at the top of the clarification tank, an overflow port is connected to one side of the top of the clarification tank, and a mixing agitator tank is connected to the end of the overflow port away from the clarification tank.

[0008] Preferably, an organic phase inlet and a dilute sulfuric acid inlet are inserted on both sides of the outer top of the mixing mixer tank, a mixer is fixed through the middle of the top of the mixing mixer tank, a stirrer is nested on the output end of the mixer, and the organic phase entering the organic phase inlet is P2O4.

[0009] Preferably, a calcium slag discharge port is inserted at a corner of the bottom of the clarification tank, a solid-liquid separator is connected to the bottom of the calcium slag discharge port, a calcium slag transfer tank is connected to the bottom of the calcium slag discharge port, and a calcium slag feed pump is connected to one side of the outer bottom of the calcium slag transfer tank through a pipeline.

[0010] Preferably, the output end of the calcium slag feed pump is connected to a calcium slag filter press via a pipeline, and a calcium slag washing tank is aligned and placed directly below the calcium slag filter press.

[0011] Preferably, a calcium slag washing tank bottom side is connected to a calcium slag washing feed pump via a pipeline, and a calcium slag washing filter press is externally connected to an output end of the calcium slag washing feed pump.

[0012] Preferably, the clarification tank, the arc collector, the scraper shaft, the scraper blades and the agitator are made of anti-sticking materials such as polytetrafluoroethylene or Teflon and other acid-resistant, low-surface-roughness mirror materials.

[0013] Beneficial technical effects of the utility model:

[0014] The utility model designs a novel stripping automatic decalcification device composed of components such as an arc collector, a spiral scraper, a calcium slag filter press and a liquid phase return pipe, which can realize the efficient separation of the calcium slag into an extraction system, and solves the problem of a large amount of calcium slag enrichment in the extraction P204 stripping section in the existing production process, resulting in pipeline blockage and serious influence on the normal operation of the extraction system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure and flow of a preferred embodiment of a device for automatic decalcification by stripping according to the utility model;

[0016] Figure 2 It is a right sectional view of a middle clarification tank according to a preferred embodiment of a device for automatic decalcification by stripping of the utility model.

[0017] The following are the descriptions of the reference numerals:

[0018] 1. Organic phase inlet; 2. Mixer; 3. Dilute sulfuric acid inlet; 4. Overflow port; 5. Liquid phase return pipe; 6. Ultrasonic vibrator; 7. Clarifying tank; 8. Calcium slag filter press; 9. Calcium slag washing filter press; 10. Calcium slag washing feed pump; 11. Calcium slag washing tank; 12. Calcium slag feed pump; 13. Calcium slag feed pump; 14. Calcium slag discharge port; 15. Spiral scraper; 16. Scraper shaft; 17. Scraper blades; 18. Arc collector; 19. Agitator; 20. Mixing mixer tank. DETAILED DESCRIPTION

[0019] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0020] like Figure 1-Figure 2 As shown, a device for automatic decalcification by stripping provided in this embodiment includes a clarification tank 7, an arc collector 18 is fixed in the middle of the clarification tank 7, an ultrasonic vibration rod 6 is installed directly above the arc collector 18, a spiral scraper 15 is arranged on one side of the outside of the clarification tank 7, a scraper shaft 16 rotatably connected to the inner wall of the clarification tank 7 is fixedly installed on the output end of the spiral scraper 15, and scraper blades 17 are welded on the outer wall of the scraper shaft 16. A liquid phase return pipe 5 is inserted at the top of the clarification tank 7, an overflow port 4 is connected to one side of the top of the clarification tank 7, and a mixing and stirring machine tank 20 is connected to the overflow port 4 away from the clarification tank 7. The ultrasonic vibration rod 6 device vibrates regularly, and a small amount of calcium sulfate that may adhere to the walls of the clarification tank 7 and the arc collector 18 can be timely removed from the wall to the bottom of the arc collector 18 by ultrasonic vibration.

[0021] An organic phase inlet 1 and a dilute sulfuric acid inlet 3 are inserted on both sides of the outer top of the mixing and blending machine tank 20. A blender 2 is fixed through the middle of the top of the mixing and blending machine tank 20. A blender 19 is nested on the output end of the blender 2. The organic phase entering the organic phase inlet 1 is P2O4. The calcium-containing extracted organic phase and the dilute sulfuric acid are stripped through the mixing and blending machine tank 20. Calcium sulfate exceeding the solubility is precipitated from the solution and enters the clarification tank 7 through the overflow port 4 for sedimentation together with the empty organic phase.

[0022] A calcium slag discharge port 14 is plugged into a corner of the bottom of the clarification tank 7, a solid-liquid separator is connected to the bottom of the calcium slag discharge port 14, a calcium slag transfer tank 13 is connected to the bottom of the calcium slag transfer tank 13, a calcium slag feed pump 12 is connected to the outer bottom side of the calcium slag transfer tank 13 through a pipeline, and the calcium slag slurry discharged from the arc collector 18 passes through the solid-liquid separation system for solid-liquid separation, and is washed through the washing system to obtain pure calcium sulfate slag for construction, and the washing water is reused. The solid-liquid separation equipment of the claim includes but is not limited to plate-and-frame filter presses, disc filters, fine filters and other solid-liquid separation equipment.

[0023] The output end of the calcium slag feed pump 12 is connected to the calcium slag filter press 8 through a pipeline, and a calcium slag washing tank 11 is aligned and placed directly below the calcium slag filter press 8.

[0024] A calcium slag washing tank 11 is connected to a calcium slag washing feed pump 10 at one bottom side through a pipeline, and a calcium slag washing filter press 9 is externally connected to the output end of the calcium slag washing feed pump 10 .

[0025] The materials of the clarifier 7, arc collector 18, scraper shaft 16, scraper blades 17 and agitator 19 are anti-sticking materials such as polytetrafluoroethylene or Teflon and other acid-resistant, low-surface-roughness mirror materials to prevent calcium sulfate from firmly adhering to the material wall, which is not convenient for automatic cleaning. The entire system adopts an automatic control system. According to the generation of stripped calcium and the sticking to the wall, automatic ultrasonic vibration wall cleaning, automatic scraping and automatic solid-liquid separation are set up, which can greatly reduce the labor consumption of calcium slag cleaning and the downtime loss caused to the production system by stopping the machine for manual cleaning of calcium slag.

[0026] Working principle of the device: When the device is used, the calcium-loaded organic phase of the extraction system enters the mixing and blending machine tank 20 from the organic phase inlet 1, and the stripped sulfuric acid enters the mixing and blending machine tank 20 from the dilute sulfuric acid inlet 3. The stripping reaction occurs through the mixer 2 under the action of the stirrer 19, and calcium is dissolved from the organic phase and reacts with the dilute sulfuric acid to form calcium sulfate. When the saturation of calcium sulfate is exceeded, calcium sulfate precipitates from the solution in the form of calcium sulfate precipitate, and the calcium sulfate precipitate enters the clarification tank 7 together with the empty organic phase through the overflow port 4. Calcium sulfate will naturally settle on the walls of the clarification tank 7 and the arc collector 18. The ultrasonic vibration rod 6 is automatically started regularly to make the calcium sulfate precipitation crystals adhering to the wall automatically fall off and be collected in the arc collector 18. The spiral scraper 15 is automatically started regularly. Under the action of the scraper shaft 16 and the scraper blades 17, the calcium sulfate in the arc collector 18 is transported to the calcium slag transfer tank 13 through the calcium slag discharge port 14. The calcium slag feed pump 12 is automatically started regularly to transport the calcium sulfate slurry to the calcium slag filter press 8, and the filtrate is returned to the clarification tank 7 through the liquid phase return pipe 5. The calcium slag is automatically discharged into the calcium slag washing tank 11. After adding washing water for stirring and washing, the washed calcium slurry is transported to the washing calcium slag filter press 9 through the washing calcium slag feed pump 10. The washing water is reused after being treated as wastewater. The washed slag is pure calcium sulfate slag, which can be sold as a by-product.

[0027] The above are only further embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present invention according to the technical solution and concept of the present invention, which fall within the protection scope of the present invention.

Claims

1. A stripping automatic decalcification device, characterized in that: The invention comprises a clarification tank (7), wherein a circular arc material collector (18) is fixed in the middle of the clarification tank (7), an ultrasonic vibration rod (6) is installed directly above the circular arc material collector (18), a spiral scraper (15) is arranged on one side of the outside of the clarification tank (7), a scraper shaft (16) is fixedly installed on the output end of the spiral scraper (15), and scraper blades (17) are welded on the outer wall of the scraper shaft (16), a liquid phase return pipe (5) is inserted at the top of the clarification tank (7), and an overflow port (4) is connected to one side of the top of the clarification tank (7), and a mixing and stirring tank (20) is connected to the overflow port (4) at one end away from the clarification tank (7).

2. The device for automatic decalcification by stripping according to claim 1, characterized in that: An organic phase inlet (1) and a dilute sulfuric acid inlet (3) are inserted on both sides of the outer top of the mixing and blending machine tank (20), a blender (2) is fixed through the middle of the top of the mixing and blending machine tank (20), a blender (19) is embedded on the output end of the blender (2), and the organic phase entering the organic phase inlet (1) is P2O4.

3. A stripping automatic decalcification device according to claim 2, characterized in that: A calcium slag discharge port (14) is inserted at a corner of the bottom of the clarification tank (7), a solid-liquid separator is connected to the bottom of the calcium slag discharge port (14), a calcium slag transfer tank (13) is connected to the bottom of the calcium slag discharge port (14), and a calcium slag feed pump (12) is connected to one side of the outer bottom of the calcium slag transfer tank (13) via a pipeline.

4. The stripping automatic decalcification device according to claim 3 is characterized in that: The output end of the calcium slag feed pump (12) is connected to a calcium slag filter press (8) via a pipeline, and a calcium slag washing tank (11) is placed aligned directly below the calcium slag filter press (8).

5. The device for automatic decalcification by stripping according to claim 4, characterized in that: A calcium slag washing tank (11) is connected to a calcium slag washing feed pump (10) via a pipeline at one side of the bottom thereof, and a calcium slag washing filter press (9) is externally connected to the output end of the calcium slag washing feed pump (10).

6. The stripping automatic decalcification device according to claim 5, characterized in that: The material of the clarification tank (7), the arc collector (18), the scraper shaft (16), the scraper blade (17) and the stirrer (19) is a mirror material.

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