CN218507566U - C272 extraction system for nickel-magnesium separation - Google Patents
C272 extraction system for nickel-magnesium separation Download PDFInfo
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- CN218507566U CN218507566U CN202222721466.3U CN202222721466U CN218507566U CN 218507566 U CN218507566 U CN 218507566U CN 202222721466 U CN202222721466 U CN 202222721466U CN 218507566 U CN218507566 U CN 218507566U
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Abstract
The utility model relates to a C272 extraction system for nickel magnesium separation, it includes saponification unit and extraction unit, the saponification unit includes the caustic soda storage tank, the extractant storage tank, sodium soap device and nickel soap device, sodium soap device includes pipe mixer and leads to the water jacket, pipe mixer and caustic soda storage tank and extractant storage tank intercommunication, it establishes in pipe mixer periphery to lead to the water jacket cover, nickel soap device is equipped with nickel sulfate solution, and draw the unit including magnesium extraction device and anti-magnesium device with pipe mixer intercommunication, magnesium extraction device is equipped with the liquid before the extraction, and communicate with nickel soap device, the dilute sulphuric acid solution is equipped with in the anti-magnesium device, anti-magnesium device and magnesium extraction device and extractant storage tank intercommunication; the method solves the problems that in the prior art, when the C272 extractant is used for separating nickel and magnesium, the production cost is overhigh, and the extractant is easy to lose and the production line stops production due to crystallization of the extractant caused by too low temperature, so that economic loss is caused.
Description
Technical Field
The utility model relates to a chemical industry equipment technical field especially relates to a C272 extraction system for nickel magnesium separation.
Background
Nickel is an important metal, is widely applied to the steel industry and the new energy industry, particularly meets the requirement of long endurance of electric automobiles in recent years, promotes the development of lithium batteries to high nickel and increases the requirement of nickel. The nickel-magnesium separation is an important process link for producing high-purity battery-grade nickel sulfate. The prior nickel-magnesium separation method comprises an adsorption method, an extraction method and a precipitation method. The extraction method is an effective means for preparing high-purity raw materials, has good separation effect and mature industrial application, and is a method commonly used in the industry.
The extracting agent used for separating nickel and magnesium by an extraction method comprises a C272, P507, P204-N235 composite extracting agent and the like, wherein the C272 nickel and magnesium has a good separation effect and is widely applied to the separation of nickel and magnesium and nickel and cobalt in the year, for example, the Chinese invention patent with the patent application number of CN201910348755.3 provides a method for recovering valuable metals in waste nickel-cobalt-manganese ternary lithium batteries, the separation of nickel and magnesium is realized by C272 extraction, however, the C272 extracting agent is expensive and has high production cost, and simultaneously, the C272 extracting agent needs to be saponified before being used, and the C272 sodium salt generated after the C272 extracting agent is saponified has great influence on the solubility in an organic phase due to the temperature, and the extracting agent is easy to crystallize when the temperature is too low, so that the extracting agent is lost and production line is stopped, and further economic loss is caused.
Therefore, when the C272 extractant is used for separating nickel and magnesium in the prior art, the production cost is too high, and the extractant is easy to crystallize due to too low temperature, so that the extractant is lost, a production line stops production, and economic loss is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need to provide a C272 extraction system for nickel-magnesium separation, so as to solve the problems in the prior art that when a C272 extractant is used to separate nickel and magnesium, the production cost is too high, and crystallization of the extractant is easily caused by too low temperature, which leads to extractant loss and production line shutdown, and further causes economic loss.
The utility model provides a C272 extraction system for nickel magnesium separation includes saponification unit and extraction unit, the saponification unit includes caustic soda storage tank, extractant storage tank, sodium soap device and nickel soap device, sodium soap device includes pipe-line mixer and water-flowing jacket, the pipe-line mixer with caustic soda storage tank and extractant storage tank intercommunication, water-flowing jacket cover is established the pipe-line mixer periphery, nickel soap device be equipped with nickel sulfate solution, and with the pipe-line mixer intercommunication for the sodium in the replacement extractant, the extraction unit is including magnesium extraction device and anti-magnesium device, the magnesium extraction device is equipped with preceding liquid, and with nickel soap device intercommunication for nickel in the preceding liquid of separation extraction, be equipped with dilute sulfuric acid solution in the anti-magnesium device, the anti-magnesium device with the magnesium extraction device and extractant storage tank intercommunication is used for separating extractant and magnesium after the magnesium extraction, and with the extractant circulation extremely in the extractant storage tank recycle utilizes.
Further, the saponification unit still includes a washing unit, the nickel soap device with extract the magnesium device via the washing unit intercommunication, the nickel soap device with the washing unit all sets up to extraction equipment, the oil phase of nickel soap device separation is discharged in the washing unit, be equipped with the pure water that is arranged in washing extractant residual sodium, the oil phase of washing unit separation is discharged to in extracting the magnesium device, the aqueous phase of washing unit separation is discharged to recycle in the nickel soap device.
Further, liquid storage tank and pure water storage tank behind liquid storage tank, the nickel soap before the saponification unit still includes the nickel soap, before the nickel soap liquid storage tank with behind the nickel soap liquid storage tank all with nickel soap device intercommunication, before the nickel soap liquid storage tank be used for to the nickel soap device provides nickel sulfate, the aqueous phase of nickel soap device is arranged into in the liquid storage tank behind the nickel soap, the pure water storage tank with the washing device intercommunication is used for to the washing device supplies water.
Further, the storage tank for the post-nickel soap liquid is communicated with the magnesium reverse device, and is used for separating and recovering an extracting agent contained in the post-nickel soap liquid through the magnesium reverse device.
Further, the extraction unit further comprises a pickling device, the magnesium extraction device is communicated with the magnesium stripping device through the pickling device, the pickling device is also an extraction device, a dilute sulfuric acid solution is arranged in the pickling device and used for washing nickel in the process, a separated water phase of the pickling device flows back to the magnesium extraction device, and an oil phase separated by the pickling device is discharged into the magnesium stripping device.
Further, the extraction unit further comprises a pre-extraction liquid storage tank, a raffinate storage tank, a first dilute sulfuric acid storage tank, a second dilute sulfuric acid storage tank and a magnesium-stripping rear liquid storage tank, wherein the pre-extraction liquid storage tank and the raffinate storage tank are both communicated with the magnesium-stripping device, the pre-extraction liquid storage tank is used for introducing pre-extraction liquid to be extracted into the magnesium-stripping device, the raffinate storage tank is used for storing aqueous phase products extracted and separated by the magnesium-stripping device, the first dilute sulfuric acid storage tank and the second dilute sulfuric acid storage tank are respectively communicated with the acid washing device and the magnesium-stripping device and are respectively used for providing dilute sulfuric acid solutions for the acid washing device and the magnesium-stripping device, and the magnesium-stripping rear liquid storage tank is communicated with the magnesium-stripping device and is used for collecting the aqueous phase products separated by the magnesium-stripping device.
Further, the nickel soap device consists of a 1-5-level box-type extraction tank or a centrifugal extractor, the water washing device consists of a 1-3-level box-type extraction tank or a centrifugal extractor, the magnesium extracting device consists of a 3-10-level box-type extraction tank or a centrifugal extractor, the acid washing device consists of a 2-5-level box-type extraction tank or a centrifugal extractor, and the magnesium returning device consists of a 2-4-level box-type extraction tank or a centrifugal extractor.
Further, each level of the box-type extraction tank of the nickel soap device, the magnesium extraction device, the acid pickling device and the magnesium counter-device is provided with a stirring device, the oil phase of each level of the box-type extraction tank of the nickel soap device, the magnesium extraction device, the acid pickling device and the magnesium counter-device and the centrifugal extractor flow from the first level to the last level, and the water phase flows from the last level to the first level.
The system comprises an extraction agent storage tank, a magnesium-reverse product treatment unit, a nickel-reverse product treatment unit and a nickel-reverse product treatment unit, wherein the magnesium-reverse product treatment unit comprises a clarification device, a nickel-reverse kettle and a nickel-reverse filter press, the magnesium-reverse device is communicated with the extraction agent storage tank through the clarification device, the clarification device can be used for standing and separating an oil phase product discharged by the magnesium-reverse device, the separated clarified extraction agent is introduced into the extraction agent storage tank for recycling, the nickel-reverse kettle is communicated with the magnesium-reverse liquid storage tank and the nickel-reverse filter press, alkali liquor is added into the nickel-reverse kettle for precipitating nickel ions, and the nickel-reverse product treatment unit is used for separating and collecting nickel hydroxide precipitate in a solution discharged by the nickel-reverse kettle.
Furthermore, the nickel deposition kettle is also provided with a stirring paddle and an online pH detection device.
Compared with the prior art, the utility model provides a C272 extraction system for nickel magnesium separation, through with the setting of pipe mixer and water jacket in the sodium soap device, make alkali lye and C272 extractant carry out intensive mixing in the pipe mixer and carry out saponification, through the temperature of water jacket adjustment pipe mixer, avoid its temperature to hang down the crystallization that leads to the C272 extractant excessively, and simultaneously, magnesium in the C272 extractant after will accomplishing the magnesium extraction through the setting of anti-magnesium device separates out, realize the regeneration of C272 extractant, and let in the C272 extractant after regenerating to carry out cyclic utilization in the extractant storage tank, with the consumption that reduces the extractant, and the reduction in production cost.
Drawings
Fig. 1 is a schematic structural diagram of the whole C272 extraction system for nickel-magnesium separation according to the present embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sodium soap device in an embodiment of the C272 extraction system for nickel-magnesium separation according to the present invention.
In the figure: 1. a saponification unit; 2. an extraction unit; 3. a reverse magnesium product treatment unit; 11. a liquid caustic soda storage tank; 12. an extractant storage tank; 13. a sodium soap device; 14. a nickel soap device; 15. a water washing device; 16. a nickel soap precursor liquid storage tank; 17. a nickel soap post-liquid storage tank; 18. a pure water storage tank; 131. a pipeline mixer; 132. a water jacket is filled; 21. a magnesium extraction device; 22. a magnesium-removing device; 23. a pickling device; 24. a pre-extraction liquid storage tank; 25. a raffinate storage tank; 26. a first dilute sulfuric acid storage tank; 27. a second dilute sulfuric acid storage tank; 28. a magnesium-reversed liquid storage tank; 31. a clarification device; 32. a nickel deposition kettle; 33. and (4) depositing a nickel filter press.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.
As shown in fig. 1-2, a C272 extraction system for nickel-magnesium separation in the present embodiment includes a saponification unit 1 and an extraction unit 2, the saponification unit 1 includes a caustic soda tank 11, an extractant tank 12, a sodium soap apparatus 13 and a nickel soap apparatus 14, the sodium soap apparatus 13 includes a pipe mixer 131 and a water jacket 132, the pipe mixer 131 is communicated with the caustic soda tank 11 and the extractant tank 12, the water jacket 132 is sleeved on the periphery of the pipe mixer 131, the nickel soap apparatus 14 contains a nickel sulfate solution and is communicated with the pipe mixer 131 for replacing sodium in the extractant, the extraction unit 2 includes a magnesium extraction apparatus 21 and a magnesium counter-extraction apparatus 22, the magnesium extraction apparatus 21 contains a pre-extraction solution and is communicated with the nickel soap apparatus 14 for separating magnesium in the pre-extraction solution, the magnesium counter-extraction apparatus 22 contains a dilute sulfuric acid solution, the magnesium counter-extraction apparatus 22 is communicated with the magnesium extraction apparatus 21 and the extractant tank 12 for separating magnesium from the extracted extractant and recycling the extractant in the extractant tank 12.
The saponification unit 1 is used for performing saponification treatment on an extracting agent before use, the saponification unit 1 comprises a liquid alkali storage tank 11, an extracting agent storage tank 12, a sodium soap device 13 and a nickel soap device 14, a sodium hydroxide alkali solution is filled in the liquid alkali storage tank 11, a C272 extracting agent is filled in the extracting agent storage tank 12, the liquid alkali storage tank 11 and the extracting agent storage tank 12 are used for providing raw materials for saponification reaction in the sodium soap device 13, the sodium soap device 13 comprises a pipeline mixer 131 and a water passing jacket 132, the pipeline mixer 131 is respectively communicated with the liquid alkali storage tank 11 and the extracting agent storage tank 12 to realize mixing of sodium hydroxide and the C272 extracting agent, so that saponification reaction is fully performed, a temperature-controllable fluid is introduced into the water passing jacket 132 to keep the temperature in the pipeline mixer 131 to avoid crystallization of the saponified C272 extracting agent, a nickel sulfate solution is filled in the nickel soap device 14, the nickel soap device 14 is communicated with the pipeline mixer 131, the pipeline mixer 131 introduces the C272 extracting agent after the sodium soap into the nickel soap device 14, nickel soap device 14 removes nickel ions in the nickel ion displacement agent, and the purity of a subsequent sodium ion extraction solution is prevented from being influenced by sodium ion displacement; the extraction unit 2 extracts and separates nickel from nickel-magnesium-containing pre-extraction solution, and comprises a magnesium extraction device 21 and a magnesium counter-extraction device 22, the magnesium extraction device 21 is filled with pre-extraction solution to be extracted and communicated with a nickel soap device 14, an extractant after nickel soap in the nickel soap device 14 is introduced into the magnesium extraction device 21 to be fully mixed with the pre-extraction solution, magnesium in the pre-extraction solution is transferred into the extractant, nickel in the extractant is transferred into the pre-extraction solution, the pre-extraction solution and the extractant are respectively inorganic and organic solutions (also can be called as an aqueous phase and an oil phase) which are mutually incompatible, the two solutions are respectively discharged after being separated, so that a nickel-containing raffinate and a magnesium-containing extractant are discharged, the magnesium counter-extraction device 22 is communicated with the magnesium extraction device 21, the magnesium-containing extractant separated in the magnesium extraction device 21 is introduced into the magnesium counter-extraction device 22, the magnesium counter-extraction device 22 is filled with sulfuric acid for counter-extracting magnesium in the extractant, magnesium in the dilute sulfuric acid is dissolved in a dilute sulfuric acid aqueous phase to be separated from the extractant oil phase, so that the magnesium counter-extraction device 12 can be recycled, and the extractant can be used.
It should be noted that the water temperature in the water jacket 132 is adjustable between 10 ℃ and 60 ℃.
In the present embodiment, the saponification unit 1 is a unit for performing a preliminary treatment on the extractant, the extractant is provided with extraction activity by performing the saponification treatment on the extractant, a sodium hydroxide lye is usually added to perform the saponification reaction with the extractant, sodium in the extractant needs to be removed after the saponification reaction in order to avoid introducing sodium impurities into subsequent extraction products, and in the process, in order to improve the removal effect on sodium and reduce the loss of the extractant, the composition and structure of the saponification unit 1 are optimized in the following embodiments.
In order to more effectively remove sodium in the extractant, in a preferred embodiment, the saponification unit 1 further comprises a water washing device 15, the nickel soap device 14 is communicated with the magnesium extraction device 21 through the water washing device 15, the nickel soap device 14 and the water washing device 15 are both set as extraction equipment, an oil phase separated by the nickel soap device 14 is discharged into the water washing device 15, pure water for residual sodium in the extractant is filled in the water washing device 15, an oil phase separated by the water washing device 15 is discharged into the magnesium extraction device 21, and a water phase separated by the water washing device 15 is discharged into the nickel soap device 14 for recycling.
The water washing device 15 is arranged to further wash sodium in the extractant, so that sodium is dissolved in the water phase and separated from the extractant, the nickel-containing extractant washed by the water washing device 15 is introduced into the magnesium extraction device 21, and the sodium-containing water phase separated from the water washing device 15 is introduced into the nickel soap device 14, so that the concentration of sodium ions in the water phase of the nickel soap device 14 is reduced, and the removal effect of the sodium ions is improved.
In order to maintain the stable operation of the saponification unit 1, in a preferred embodiment, the saponification unit 1 further comprises a nickel soap front liquid storage tank 16, a nickel soap rear liquid storage tank 17 and a pure water storage tank 18, wherein the nickel soap front liquid storage tank 16 and the nickel soap rear liquid storage tank 17 are both communicated with the nickel soap device 14, the nickel soap front liquid storage tank 16 is used for supplying nickel sulfate to the nickel soap device 14, an aqueous phase extracted and separated by the nickel soap device 14 is discharged into the nickel soap rear liquid storage tank 17, and the pure water storage tank 18 is communicated with the water washing device 15 and is used for supplying water to the water washing device 15.
Wherein, the above-mentioned each storage tank is set up and is used for to the continuous raw materials supply of each apparatus in saponification unit 1 and the collection of extraction product, make saponification unit 1 can continuous stable operation.
In order to reduce the loss of the extractant in the sodium ion removal process, in a preferred embodiment, the nickel soap post liquid storage tank 17 is communicated with an anti-magnesium device 22, so that the extractant and nickel contained in the nickel soap post liquid are separated and recovered through the anti-magnesium device 22.
Wherein, when the nickel soap device 14 separates the oil phase and the water phase, a small part of the extraction machine oil phase is inevitably separated into the nickel soap post-liquid storage tank 17 along with the water phase, in order to avoid the loss of the part of the extraction agent, the nickel soap post-liquid is introduced into the magnesium-removing device 22 from the nickel soap post-liquid storage tank 17, so that the extraction agent in the nickel soap post-liquid is separated out along with the extraction agent in the magnesium-removing device 22, and then is introduced into the extraction agent storage tank 12 for recycling, thereby avoiding the loss of the part of the extraction agent.
In the present embodiment, the extraction unit 2 is not only used for separating nickel ions in the pre-extraction solution, but also used for performing back extraction on magnesium in the extraction solution, so as to purify and regenerate the extractant, so that the extractant can be recycled, and in order to ensure the nickel and magnesium extraction effect of the extraction unit 2, in the following embodiments, the structure and composition of the extraction unit 2 are improved as follows.
In order to improve the extraction effect of nickel, in a preferred embodiment, the extraction unit 2 further includes a pickling device 23, the magnesium extraction device 21 is communicated with the magnesium stripping device 22 through the pickling device 23, the pickling device 23 is also an extraction device, a dilute sulfuric acid solution is contained in the pickling device 23 to wash nickel in the extractant, a separated water phase of the pickling device 23 flows back to the magnesium extraction device 21, and an oil phase separated by the pickling device 23 is discharged to the magnesium stripping device 22.
The pickling device 23 is arranged to further extract nickel in the magnesium-containing extractant discharged from the magnesium extraction device 21, so as to prevent the nickel from entering the magnesium stripping device 22 to cause loss, a dilute sulfuric acid solution is contained in the pickling device 23, a small amount of nickel contained in the magnesium-containing extractant can be transferred to a dilute sulfuric acid aqueous phase through sufficient mixing with the magnesium-containing extractant, and then the aqueous phase in the pickling device 23 is refluxed to the magnesium extraction device 21, so that the aqueous phase and the aqueous phase in the magnesium extraction device 21 are separated into a raffinate storage tank 25, thereby reducing the loss of nickel.
In order to ensure the stable operation of the extraction unit 2, in a preferred embodiment, the extraction unit 2 further includes a pre-extraction liquid storage tank 24, a raffinate storage tank 25, a first dilute sulfuric acid storage tank 26, a second dilute sulfuric acid storage tank 27, and a magnesium-stripping liquid storage tank 28, wherein the pre-extraction liquid storage tank 24 and the raffinate storage tank 25 are both communicated with the magnesium-stripping device 21, the pre-extraction liquid storage tank 24 is used for introducing the pre-extraction liquid to be extracted into the magnesium-stripping device 21, the raffinate storage tank 25 is used for storing the aqueous phase product extracted and separated by the magnesium-stripping device 21, the first dilute sulfuric acid storage tank 26 and the second dilute sulfuric acid storage tank 27 are respectively communicated with the pickling device 23 and the magnesium-stripping device 22 and are respectively used for providing the dilute sulfuric acid solution to the pickling device 23 and the magnesium-stripping device 22, and the magnesium-stripping liquid storage tank 28 is communicated with the magnesium-stripping device 22 and is used for collecting the aqueous phase product separated by the magnesium-stripping device 22.
Wherein, the above-mentioned storage tanks are used for providing the aqueous phase solvent required for extraction for each device in the extraction unit 2 and collecting the aqueous phase product separated in each device, so that the extraction unit 2 can continuously and stably operate, it should be noted that the sulfuric acid concentration of the first dilute sulfuric acid storage tank 26 can be in the range of 0.5-2N, preferably 1N, and the sulfuric acid concentration of the second dilute sulfuric acid storage tank 27 can be in the range of 2-4N, preferably 4N.
In order to ensure the extraction effect of each device in the system, in a preferred embodiment, the nickel soap device 14 consists of a 1-5 stage box-type extraction tank or a centrifugal extractor, the water washing device 15 consists of a 1-3 stage box-type extraction tank or a centrifugal extractor, the magnesium extraction device 21 consists of a 3-10 stage box-type extraction tank or a centrifugal extractor, the acid washing device 23 consists of a 2-5 stage box-type extraction tank or a centrifugal extractor, and the magnesium counter-device 22 consists of a 2-4 stage box-type extraction tank or a centrifugal extractor.
It can be understood that the arrangement of the multistage extraction tank or the centrifugal extractor is to improve the extraction effect, and those skilled in the art can adjust the stage number of the extraction equipment in each device according to the actual use requirement, preferably, the nickel soap device 14 is composed of 5 stages of extraction equipment, the water washing device 15 is composed of 2 stages of extraction equipment, the magnesium extraction device 21 is composed of 5 stages of extraction equipment, the acid washing device 23 is composed of 4 stages of extraction equipment, and the magnesium removing device 22 is composed of 5 stages of extraction equipment.
In order to further improve the extraction effect, in a preferred embodiment, each stage of the box-type extraction tank of the nickel soap device 14, the magnesium extraction device 21, the acid washing device 23 and the magnesium counter-device 22 is provided with a stirring device, the oil phase of each stage of the box-type extraction tank and the oil phase of the centrifugal extractor of the nickel soap device 14, the magnesium extraction device 21, the acid washing device 23 and the magnesium counter-device 22 flow from the first stage to the last stage, and the water phase flows from the last stage to the first stage.
The stirring paddles are arranged to fully mix the oil phase and the water phase in each device so as to improve the extraction effect, and the reverse arrangement of the oil phase and the water phase in the opposite directions is used for realizing the gradual extraction operation of each device so as to achieve the effect of further purifying, extracting and separating the products.
The C272 extraction system for nickel-magnesium separation further comprises an anti-magnesium product processing unit 3, the anti-magnesium product processing unit 3 comprises a clarifying device 31, a nickel deposition kettle 32 and a nickel deposition filter press 33, the anti-magnesium device 22 is communicated with the extractant storage tank 12 through the clarifying device 31, the clarifying device 31 can be used for standing and separating an oil phase product discharged by the anti-magnesium device 22, the separated clarified extractant is introduced into the extractant storage tank 12 for recycling, the nickel deposition kettle 32 is communicated with the anti-magnesium post-liquid storage tank 28 and the nickel deposition filter press 33, an alkali liquor is added into the nickel deposition kettle 32 for depositing nickel ions, and the nickel deposition filter press 33 is used for separating and collecting nickel hydroxide precipitate in a solution discharged by the nickel deposition kettle 32.
The anti-magnesium product processing unit 3 is configured to further process the oil phase and the water phase separated by the anti-magnesium device 22, and further recover the extractant in the oil phase and the nickel in the water phase, the clarifying device 31 may be set as a standing layering device, the oil phase discharged by the anti-magnesium device 22 is introduced into the clarifying device 31, a small amount of water contained in the oil phase extractant discharged by the anti-magnesium device 22 is separated through standing layering to obtain a pure extractant, which is convenient for recycling, the water phase product discharged by the anti-magnesium device 22 is introduced into the nickel deposition kettle 32, the pH value of the solution in the nickel deposition kettle 32 is adjusted by introducing an alkaline solution into the nickel deposition kettle 32, nickel not extracted in the previous extraction process is deposited, the deposit is separated through a pressure filtration device and collected to avoid loss of nickel, so that the extractant and nickel are effectively recovered, the separated wastewater containing magnesium is subjected to wastewater treatment in a workshop, it is required to be noted that the pH in the nickel deposition kettle in this embodiment is 8-9, and the working pressure of a pressure machine is 0-0.8MPa.
In a preferred embodiment, the nickel deposition tank 32 further has a stirring paddle and an on-line pH detection device.
Wherein, the rotating speed of the stirring paddle is within the range of 0-500r/min, the pH value in the reaction kettle is convenient to be regulated and controlled by monitoring the pH value in the nickel deposition kettle 32 in real time, and the introduction of magnesium impurities into the nickel hydroxide deposition is avoided.
It should be noted that, the utility model discloses in all can set up the pump between each device and the storage tank and guarantee the stable flow of liquid, for the flow of the different liquid of control, can set up to the measuring pump, preferably, the pump between liquid storage tank 17 and the anti-magnesium device 22 behind the nickel soap can set up to diaphragm pump or centrifugal pump, sink the pump between nickel cauldron 32 and the heavy nickel pressure filter 33 and can set up to the diaphragm pump.
Compared with the prior art: the utility model provides a C272 extraction system for nickel magnesium separation, through the setting with pipeline mixer 131 and water jacket 132 in sodium soap device 13, make alkali lye and C272 extractant carry out intensive mixing in pipeline mixer 131 and carry out saponification, adjust the temperature of pipeline mixer 131 through water jacket 132, avoid its temperature to hang down the crystallization that leads to C272 extractant excessively, and simultaneously, magnesium in the C272 extractant after will accomplishing the magnesium extraction through the setting of anti-magnesium device 22 is separated out, realize the regeneration effect of C272 extractant, and let in the C272 extractant after will regenerating in extractant storage tank 12 and carry out cyclic utilization, with the consumption that reduces the extractant, reduction in production cost;
on the other hand, through the arrangement of the nickel deposition kettle 32 and the nickel deposition filter press 33, the nickel in the water phase separated by the magnesium counter-device 22 is further recovered, the recovery rate of nickel metal is improved, and the economic benefit is improved. The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. A C272 extraction system for nickel-magnesium separation is characterized by comprising a saponification unit and an extraction unit;
the saponification unit comprises a liquid alkali storage tank, an extractant storage tank, a sodium soap device and a nickel soap device, wherein the sodium soap device comprises a pipeline mixer and a water jacket, the pipeline mixer is communicated with the liquid alkali storage tank and the extractant storage tank, the water jacket is sleeved on the periphery of the pipeline mixer, and the nickel soap device is filled with a nickel sulfate solution, is communicated with the pipeline mixer and is used for replacing sodium in the extractant;
the extraction unit comprises a magnesium extraction device and a magnesium counter-device, the magnesium extraction device is provided with pre-extraction liquid and is communicated with the nickel soap device for separating nickel in the pre-extraction liquid, the magnesium counter-device is provided with a dilute sulfuric acid solution, and the magnesium counter-device is communicated with the magnesium extraction device and the extractant storage tank for separating the extractant and magnesium after magnesium extraction and recycling the extractant to the extractant storage tank.
2. The C272 extraction system for nickel and magnesium separation according to claim 1, wherein the saponification unit further comprises a water washing device, the nickel soap device and the magnesium extraction device are communicated through the water washing device, the nickel soap device and the water washing device are both provided as extraction equipment, the oil phase separated by the nickel soap device is discharged into the water washing device, the water washing device is filled with pure water for washing residual sodium in the extractant, the oil phase separated by the water washing device is discharged into the magnesium extraction device, and the water phase separated by the water washing device is discharged into the nickel soap device for recycling.
3. The C272 extraction system for nickel-magnesium separation according to claim 2, wherein the saponification unit further comprises a nickel soap pre-liquid storage tank, a nickel soap post-liquid storage tank and a pure water storage tank, wherein the nickel soap pre-liquid storage tank and the nickel soap post-liquid storage tank are both communicated with the nickel soap device, the nickel soap pre-liquid storage tank is used for providing nickel sulfate to the nickel soap device, the water phase of the nickel soap device is discharged into the nickel soap post-liquid storage tank, and the pure water storage tank is communicated with the water washing device and is used for supplying water to the water washing device.
4. The C272 extraction system for nickel-magnesium separation according to claim 3, wherein the nickel soap post liquid storage tank is communicated with the magnesium-removing device, so as to separate and recover the extractant contained in the nickel soap post liquid through the magnesium-removing device.
5. The C272 extraction system for nickel and magnesium separation according to claim 2, wherein the extraction unit further comprises a pickling device, the magnesium extraction device is communicated with the magnesium stripping device through the pickling device, the pickling device is also an extraction device, the pickling device is filled with dilute sulfuric acid solution for washing nickel in the process, the separated water phase of the pickling device flows back to the magnesium extraction device, and the oil phase separated by the pickling device is discharged into the magnesium stripping device.
6. The C272 extraction system for nickel-magnesium separation according to claim 5, wherein the extraction unit further comprises a pre-extraction liquid storage tank, a raffinate storage tank, a first dilute sulfuric acid storage tank, a second dilute sulfuric acid storage tank, and a magnesium-back liquid storage tank, the pre-extraction liquid storage tank and the raffinate storage tank are both communicated with the magnesium extraction device, the pre-extraction liquid storage tank is used for introducing a pre-extraction liquid to be extracted to the magnesium extraction device, the raffinate storage tank is used for storing an aqueous product extracted and separated by the magnesium extraction device, the first dilute sulfuric acid storage tank and the second dilute sulfuric acid storage tank are respectively communicated with the pickling device and the magnesium-back device, and are respectively used for providing a dilute sulfuric acid solution to the pickling device and the magnesium-back device, and the magnesium-back liquid storage tank is communicated with the magnesium-back device, and is used for collecting an aqueous product separated by the magnesium-back device.
7. The C272 extraction system for nickel magnesium separation according to claim 6, wherein the nickel soap apparatus consists of 1-5 stage box type extraction tank or centrifugal extractor, the water washing apparatus consists of 1-3 stage box type extraction tank or centrifugal extractor, the magnesium extraction apparatus consists of 3-10 stage box type extraction tank or centrifugal extractor, the acid washing apparatus consists of 2-5 stage box type extraction tank or centrifugal extractor, and the magnesium removing apparatus consists of 2-4 stage box type extraction tank or centrifugal extractor.
8. The C272 extraction system for nickel-magnesium separation according to claim 7, wherein each stage of the box-type extraction tank of the nickel soap device, the magnesium extraction device, the pickling device and the magnesium stripping device is provided with a stirring device, the oil phase of each stage of the box-type extraction tank of the nickel soap device, the magnesium extraction device, the pickling device and the magnesium stripping device and the oil phase of the centrifugal extractor flow from the first stage to the last stage, and the water phase flows from the last stage to the first stage.
9. The C272 extraction system for nickel and magnesium separation according to any one of claims 6-8, further comprising an anti-magnesium product treatment unit, wherein the anti-magnesium product treatment unit comprises a clarification device, a nickel precipitation kettle and a nickel precipitation filter press, the anti-magnesium device is communicated with the extractant tank through the clarification device, the clarification device can perform standing separation on an oil phase product discharged from the anti-magnesium device, and feed the separated clarified extractant into the extractant tank for recycling, the nickel precipitation kettle is communicated with the anti-magnesium raffinate tank and the nickel precipitation filter press, an alkali liquor is added into the nickel precipitation kettle for precipitating nickel ions, and the nickel precipitation filter press is used for separating and collecting nickel hydroxide precipitate in a discharged solution from the nickel precipitation kettle.
10. The C272 extraction system for nickel magnesium separation according to claim 9, wherein the nickel precipitation tank further comprises a stirring paddle and an online pH detection device.
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