A lithium carbonate solution circulation centrifugal device and method based on the recycling of waste lithium iron phosphate batteries

Abstract

The present invention relates to the field of acid precipitation centrifugal kettles, and in particular to a lithium carbonate solution circulating centrifugal device and method based on the reuse of discarded lithium iron phosphate batteries, including an acid precipitation centrifugal kettle, the acid precipitation centrifugal kettle comprising a kettle body, an end cover is installed on the top of the kettle body, a motor is installed in the middle of the top of the end cover, a rotating shaft is fixedly connected to the driving end at the bottom of the motor, the bottom of the rotating shaft passes through the top cover, the rotating shaft is rotatably connected to the top cover, a heating rod is fixedly connected to the bottom of the rotating shaft, the heating rod is arranged on the inner side, the top cover is rotatably connected to the top of an inner cylinder, the inner cylinder is arranged in the lower part of the kettle body, a plurality of connecting frames are fixedly connected to the outer periphery of the bottom of the rotating shaft, and the connecting frames are all fixedly connected to the inner cylinder. According to the present invention, the filtered pure lithium-containing solution can be re-guided back to the inner cylinder through a through pipe to realize circulating centrifugation and complete the dual use of one cylinder, thereby making full use of the material, reducing equipment investment, and being beneficial to industrial production.

Description

Technical Field

[0001] The invention relates to the field of acid precipitation centrifugal kettles, and in particular to a lithium carbonate solution circulating centrifugal device and method based on the recycling of waste lithium iron phosphate batteries. Background Art

[0002] Lithium iron phosphate batteries have been widely used in automotive power batteries due to their high temperature resistance, high specific capacity, rich raw material sources, and low prices. With the continuous development of the new energy vehicle industry, the amount of scrapped power batteries will increase year by year. Therefore, the need to develop scrapped lithium iron phosphate recycling technology is imminent. The lithium iron phosphate in lithium iron phosphate batteries is all present in the battery positive electrode. As countries pay more attention to the global ecological environment, obtaining raw materials from secondary resources to prepare lithium iron phosphate will also become a trend in future research. However, in actual use, the current methods for recycling lithium iron phosphate batteries mainly focus on the separation and recovery of lithium elements, and most of the iron and phosphorus elements are not fully recycled, resulting in a low battery recovery rate. Therefore, we propose a lithium carbonate solution circulating centrifugal device and method based on the reuse of waste lithium iron phosphate batteries to solve the above-mentioned problems. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings existing in the background technology, and to propose a lithium carbonate solution circulating centrifugal device and method based on the recycling of waste lithium iron phosphate batteries.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a lithium carbonate solution circulating centrifuge device based on the recycling of discarded lithium iron phosphate batteries, including an acid precipitation centrifuge kettle, the acid precipitation centrifuge kettle including a kettle body, an end cover is installed on the top of the kettle body, a motor is installed in the middle of the top of the end cover, a rotating shaft is fixedly connected to the bottom driving end of the motor, the bottom of the rotating shaft passes through the top cover, the rotating shaft is rotatably connected to the top cover, a heating rod is fixedly connected to the bottom of the rotating shaft, the heating rod is arranged on the inner side of the inner cylinder, the top cover is rotatably connected to the top of the inner cylinder, the inner cylinder is arranged in the lower part of the kettle body, a plurality of connecting frames are fixedly connected to the outer periphery of the bottom of the rotating shaft, the connecting frames are all fixedly connected to the inner cylinder, the upper and lower parts of the outer periphery of the inner cylinder are rotatably connected to limiting frames, and the limiting frames are all fixedly connected to the lower part of the kettle body.

[0005] Preferably, a feed port is opened on one side of the middle portion of the end cover, a material guide pipe is fixedly connected to the bottom of the feed port, the bottom of the material guide pipe passes through one side of the middle portion of the top end of the top cover, and the feed port is fixedly connected to the top cover.

[0006] Preferably, a reflux pipe passes through the upper part of one side of the kettle body, and the bottom of the reflux pipe passes through the side of the top cover away from the material guide pipe, the end of the reflux pipe away from the top cover is fixedly connected with a liquid outlet 1, the liquid outlet 1 is flange-connected with a liquid through pipe, the end of the liquid through pipe away from the liquid outlet 1 is flange-connected with a liquid inlet 1, the liquid inlet 1 is installed at the lower part of one side of the outer periphery of the kettle body, a pump body is installed in the middle of the liquid through pipe, and the pump body is fixedly connected to the middle part of one side of the outer periphery of the kettle body.

[0007] Preferably, a heating tube is spirally wound around the lower outer periphery of the kettle body, the upper end of the heating tube is fixedly connected to an air inlet, the lower end of the heating tube is fixedly connected to an exhaust port, and the heating tube is connected to the air inlet via the exhaust port.

[0008] Preferably, evenly distributed solenoid valves are installed at the lower part of the outer circumference of the inner cylinder, filter covers are installed at the inner ports of the inner cylinder, and the interior of the inner cylinder is connected to the interior of the kettle body through the solenoid valve.

[0009] Preferably, a discharge pipe is rotatably connected to the middle part of the bottom end of the inner cylinder through a sealed bearing, the bottom of the discharge pipe passes through the middle part of the bottom end of the kettle body, the discharge pipe is fixedly connected to the kettle body, a collecting barrel is provided at the bottom of the discharge pipe, and a valve body is provided in the middle part of the discharge pipe.

[0010] Preferably, both sides of the middle of the bottom end of the kettle body are fixedly connected with a second liquid outlet, the middle of the second liquid outlet is provided with a valve body, the bottom of the second liquid outlet is respectively connected to the flanges at both ends of the connecting pipe, and the middle of one side of the connecting pipe is fixedly connected with a conduit.

[0011] Preferably, one end of the conduit away from the connecting pipe is fixedly connected to the inlet end of the filter pump, the outlet end of the filter pump is fixedly connected to a through pipe, one end of the through pipe away from the filter pump is flange-connected to a second liquid inlet, the second liquid inlet is fixedly connected to one side of the lower part of the outer periphery of the kettle body, one end of the second liquid inlet away from the through pipe is connected to the inside of the inner cylinder through a rotating sleeve, the rotating sleeve is rotatably connected to the lower part of the outer periphery of the inner cylinder, and the filter pump is installed on the lower inner side of the fixed frame.

[0012] Preferably, the upper part of the outer periphery of the kettle body is fixedly connected with evenly distributed connecting frames one, the connecting frames one are all fixedly connected to the top of the fixing frame, and the middle part of the upper end of the fixing frame is penetrated by the kettle body.

[0013] Preferably, a lithium carbonate solution circulation centrifugation method based on the reuse of waste lithium iron phosphate batteries comprises the following steps;

[0014] S1. First, the waste lithium iron phosphate battery is crushed by a crusher to obtain waste lithium iron phosphate battery powder, and then the crushed powder is introduced into the inner cylinder through the feed port and the guide tube, and then carbonic acid and hydrogen peroxide are injected into the inner cylinder to form a lithium iron phosphate mixed solution and the motor is started. The motor drives the inner cylinder to perform centrifugal mixing with a rotating shaft at a speed of 300r / min, and the lithium iron phosphate mixed solution is mixed and stirred, and the lithium iron phosphate mixed solution reacts to produce iron phosphate;

[0015] S2, turn off the motor, let the inner cylinder settle for 5 minutes, then open the solenoid valve to guide the remaining mixed solution out of the inner cylinder and into the kettle body, then open the valve on the discharge pipe to discharge the remaining iron phosphate inside the inner cylinder, and collect the iron phosphate through the collection bucket;

[0016] S3. After the remaining mixed solution enters the kettle, the hot air source is started to introduce hot air into the heating tube through the air inlet to heat and concentrate the remaining mixed solution. The heating temperature is 230 degrees Celsius to purify and concentrate the remaining mixed solution.

[0017] S4, opening the valve body on the second liquid outlet to guide the purified mixed solution out, filtering and removing impurities from the mixed solution through a filter pump, thereby removing impurities in the mixed solution to obtain a pure lithium-containing solution, and the filtered pure lithium-containing solution will be guided back into the inner cylinder through the through pipe;

[0018] S5. After the filtered pure lithium-containing solution returns to the inner cylinder, sodium carbonate is added to the inner cylinder, and the motor is started again to centrifugally mix the inner cylinder. The motor speed is 500r / min, and the heating rod at the bottom of the shaft is started. The heating temperature is 300 degrees Celsius. After mixing and heating, the lithium-containing solution reacts with the sodium carbonate to produce lithium carbonate.

[0019] S6. Turn off the motor again and let the inner cylinder settle for 5 minutes. Then open the solenoid valve again to drain the solution, so that the lithium carbonate remains in the inner cylinder and is discharged through the discharge pipe. Then people can repeat step S1. At the same time, the remaining solution from the previous cycle of the kettle body can be extracted through the pump body, and then led back to the inner cylinder through the liquid pipe, liquid outlet 1 and reflux pipe for further circulation.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The motor uses the rotating shaft to drive the inner cylinder for centrifugal mixing, which can mix and stir the lithium iron phosphate mixed solution, thereby effectively accelerating the reaction and mixing between the waste lithium iron phosphate battery powder and the carbonic acid and hydrogen peroxide, which is beneficial to practical use. At the same time, the electric heating rod at the bottom of the rotating shaft can further accelerate the mixing of the materials. At the same time, increasing the temperature can effectively accelerate the precipitation rate of lithium carbonate, which is beneficial to the recovery of iron elements in waste lithium iron phosphate batteries.

[0022] 2. After the first centrifugal sedimentation, people can open the solenoid valve to guide the remaining mixed solution out of the inner cylinder and into the kettle. In this process, the iron phosphate precipitated in the solution can be intercepted by the filter cover to prevent accidental discharge of the iron phosphate. Then, the valve on the discharge pipe is opened to discharge the remaining iron phosphate in the inner cylinder, and the iron phosphate is collected through the collection bucket, so that the effective part of the discarded lithium iron phosphate battery can be fully utilized.

[0023] 3. After the mixed solution enters the kettle body, people can start the hot air source to introduce hot air into the heating tube through the air inlet, heat and concentrate the remaining mixed solution, purify and concentrate the remaining mixed solution, and then open the valve body on the second liquid outlet to guide the purified mixed solution out. The mixed solution can be filtered and impurities can be removed by a filter pump, so that impurities in the mixed solution can be removed to obtain a pure lithium-containing solution, which is beneficial to the recovery work of subsequent processes. The pure lithium-containing solution after filtration will be guided back to the inner cylinder through the through pipe to realize circulating centrifugation and complete the dual use of one cylinder, thereby making full use of lithium, reducing equipment investment, and facilitating industrial production.

[0024] 4. When the filtered pure lithium-containing solution returns to the inner cylinder, sodium carbonate is added to the inner cylinder, the motor is started again, the inner cylinder is centrifugally mixed, and the heating rod at the bottom is started. After mixing and heating, the lithium-containing solution will react with sodium carbonate to produce lithium carbonate, thereby completing the recycling of the remaining lithium elements in the discarded lithium iron phosphate battery, which can effectively improve the recycling rate of waste batteries.

[0025] 5. During recycling, people can open the solenoid valve to drain the remaining solution, leaving the lithium carbonate in the inner cylinder and discharging it through the discharge pipe. After that, the remaining solution from the previous cycle of the kettle can be extracted through the pump body, and led back to the inner cylinder through the liquid pipe, the liquid outlet and the reflux pipe. At the same time, people can repeat the centrifugal acid precipitation steps and circulate it again. Through reciprocating circulation, the utilization rate of various materials and waste gas lithium iron phosphate batteries can be maximized to avoid waste, while reducing the pollution of battery waste, which is conducive to practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic diagram of a front view of a three-dimensional structure of a lithium carbonate solution circulation centrifugal device and method based on the recycling of waste lithium iron phosphate batteries according to the present invention;

[0027] Figure 2 It is a schematic diagram of the lower partial structure of the acid precipitation centrifugal kettle of a lithium carbonate solution circulating centrifugal device and method based on the recycling of waste lithium iron phosphate batteries of the present invention;

[0028] Figure 3 It is a schematic diagram of the partial structure of the side view of the acid precipitation centrifugal kettle of the lithium carbonate solution circulating centrifugal device and method based on the recycling of waste lithium iron phosphate batteries of the present invention;

[0029] Figure 4 This is one of the internal structure schematic diagrams of the acid precipitation centrifugal kettle of a lithium carbonate solution circulating centrifugal device and method based on the recycling of waste lithium iron phosphate batteries of the present invention;

[0030] Figure 5 This is a second schematic diagram of the internal structure of an acid precipitation centrifugal kettle of a lithium carbonate solution circulating centrifugal device and method based on the recycling of waste lithium iron phosphate batteries of the present invention;

[0031] Figure 6 A schematic top view of the internal structure of a lithium carbonate solution circulating centrifugal device and method for recycling discarded lithium iron phosphate batteries according to the present invention;

[0032] Figure 7 It is a schematic diagram of the partial structure of the heating tube of a lithium carbonate solution circulating centrifugal device and method for recycling discarded lithium iron phosphate batteries according to the present invention.

[0033] 1. Acid separation centrifugal kettle; 101. Kettle body; 102. Connecting frame 1; 103. Fixed frame; 104. End cover; 105. Feed inlet; 106. Motor; 107. Heating tube; 108. Liquid inlet 1; 109. Liquid inlet 2; 110. Exhaust port; 111. Connecting pipe; 112. Filter pump; 113. Through pipe; 114. Conduit; 115. Discharge pipe; 116. Liquid outlet 2; 117. Liquid outlet 1; 118. Pump body; 119. Inlet; 120. Reflux pipe; 121. Top cover; 122. Rotating shaft; 123. Limiting frame; 124. Feed guide pipe; 125. Inner cylinder; 126. Through pipe; 127. Solenoid valve; 128. Connecting frame 2; 129. Rotating sleeve. DETAILED DESCRIPTION

[0034] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0035] like Figure 1-Figure 7A lithium carbonate solution circulating centrifugal device based on the recycling of waste lithium iron phosphate batteries is shown, including an acid precipitation centrifugal kettle 1, the acid precipitation centrifugal kettle 1 includes a kettle body 101, the upper part of the outer periphery of the kettle body 101 is fixedly connected with a uniformly distributed connecting frame 102, the connecting frame 102 is fixedly connected to the top of the fixing frame 103, the middle part of the upper end of the fixing frame 103 is penetrated by the kettle body 101, an end cover 104 is installed on the top of the kettle body 101, a feed port 105 is opened on one side of the middle part of the end cover 104, a feed guide pipe 124 is fixedly connected to the bottom of the feed port 105, the bottom of the feed guide pipe 124 penetrates one side of the middle part of the top of the top cover 121, the feed port 105 is fixedly connected to the top cover 121, and the end cover A motor 106 is installed in the middle of the top of 104, and a rotating shaft 122 is fixedly connected to the bottom driving end of the motor 106. The bottom of the rotating shaft 122 passes through the top cover 121, and the rotating shaft 122 is rotatably connected to the top cover 121. A heating rod is fixedly connected to the bottom of the rotating shaft 122, and the heating rod is arranged on the inner side of the inner cylinder 125. The top cover 121 is rotatably connected to the top of the inner cylinder 125, and the inner cylinder 125 is arranged in the lower part of the kettle body 101. A plurality of connecting frames 128 are fixedly connected to the outer periphery of the bottom of the rotating shaft 122, and the connecting frames 128 are all fixedly connected to the inner cylinder 125. The upper and lower parts of the outer periphery of the inner cylinder 125 are rotatably connected to the limiting frames 123, and the limiting frames 123 are all fixedly connected to the lower part of the kettle body 101.

[0036] Furthermore, in a specific implementation, the waste lithium iron phosphate batteries are first crushed by a crusher to obtain waste lithium iron phosphate battery powder, and then the crushed powder is introduced into the inner tube 125 through the feed port 105 and the guide tube 124, and then carbonic acid and hydrogen peroxide are injected into the inner tube 125 to form a lithium iron phosphate mixed solution and the motor 106 is started. The motor 106 uses the rotating shaft 122 to drive the inner tube 125 for centrifugal mixing at a speed of 300r / min to mix and stir the lithium iron phosphate mixed solution. At this time, the lithium iron phosphate mixed solution reacts to produce iron phosphate. The motor 106 uses the rotating shaft 122 to drive the inner tube 125 for centrifugal mixing to mix and stir the lithium iron phosphate mixed solution, thereby effectively accelerating the reaction and mixing between the waste lithium iron phosphate battery powder and the carbonic acid and hydrogen peroxide, which is beneficial to practical use.

[0037] A heating tube 107 is spirally wound around the lower part of the outer periphery of the kettle body 101, an air inlet 119 is fixedly connected to the upper end of the heating tube 107, an exhaust port 110 is fixedly connected to the lower end of the heating tube 107, and a hot air source is connected to the heating tube 107 through the exhaust port 110 and the air inlet 119;

[0038] Furthermore, in a specific implementation, after the remaining mixed solution enters the kettle body 101, the hot air source is started to introduce hot air into the heating tube 107 through the air inlet 119 to heat and concentrate the remaining mixed solution. The heating temperature is 230 degrees Celsius to purify and concentrate the remaining mixed solution.

[0039] Among them, evenly distributed electromagnetic valves 127 are installed at the lower part of the outer periphery of the inner cylinder 125, and filter covers are installed at the inner ports of the inner cylinder 125. The interior of the inner cylinder 125 is connected to the interior of the kettle body 101 through the electromagnetic valve 127. The middle part of the bottom end of the inner cylinder 125 is rotatably connected with a discharge pipe 115 through a sealed bearing. The bottom of the discharge pipe 115 passes through the middle part of the bottom end of the kettle body 101. The discharge pipe 115 is fixedly connected to the kettle body 101. A collecting barrel is provided at the bottom of the discharge pipe 115, and a valve body is provided in the middle of the discharge pipe 115.

[0040] Furthermore, in a specific implementation, the solenoid valve 127 is opened to guide the remaining mixed solution out of the inner tube 125 and into the kettle body 101. During this process, the iron phosphate precipitated in the solution can be intercepted by the filter cover, and then the valve on the discharge pipe 115 is opened to discharge the remaining iron phosphate in the inner tube 125. The iron phosphate is collected through a collection bucket, thereby making full use of the effective part of the discarded lithium iron phosphate batteries.

[0041] Among them, both sides of the middle of the bottom end of the kettle body 101 are fixedly connected with the second liquid outlet 116, and the middle of the second liquid outlet 116 is provided with a valve body. The bottom of the second liquid outlet 116 is respectively connected with the flanges of the two ends of the connecting pipe 111, and the middle of one side of the connecting pipe 111 is fixedly connected with a guide tube 114, and the end of the guide tube 114 away from the connecting pipe 111 is fixedly connected with the inlet end of the filter pump 112, and the outlet end of the filter pump 112 is fixedly connected with a through pipe 113, and the end of the through pipe 113 away from the filter pump 112 is flange-connected with the second liquid inlet 109, and the second liquid inlet 109 is fixedly connected to one side of the lower part of the outer periphery of the kettle body 101, and the end of the second liquid inlet 109 away from the through pipe 113 is connected with the inside of the inner cylinder 125 through a rotating sleeve 129, and the rotating sleeve 129 is rotatably connected to the lower part of the outer periphery of the inner cylinder 125, and the filter pump 112 is installed at the lower inner side of the fixed frame 103;

[0042] Furthermore, in a specific implementation, the valve body on the second liquid outlet 116 is opened to guide the purified mixed solution out, and the mixed solution can be filtered and impurity removed by the filter pump 112, so that the impurities in the mixed solution can be removed to obtain a pure lithium-containing solution. The filtered pure lithium-containing solution will be guided back to the inner cylinder 125 through the through pipe 113. When the filtered pure lithium-containing solution returns to the inner cylinder 125, sodium carbonate is added to the inner cylinder 125, and the motor 106 is started again to centrifugally mix the inner cylinder 125. The speed of the motor 106 is 500r / min, and the heating rod at the bottom of the rotating shaft 122 is started, and the heating temperature is 300 degrees Celsius. After mixing and heating, the lithium-containing solution will react with sodium carbonate to produce lithium carbonate, thereby completing the recycling of the remaining lithium element in the discarded lithium iron phosphate battery, and effectively improving the recycling rate of waste batteries.

[0043] Among them, a reflux pipe 120 is penetrated through the upper part of one side of the kettle body 101, and the bottom of the reflux pipe 120 penetrates the side of the top cover 121 away from the guide pipe 124, and the end of the reflux pipe 120 away from the top cover 121 is fixedly connected with a liquid outlet 117, and the liquid outlet 117 is flange-connected with a liquid pipe 126, and the end of the liquid pipe 126 away from the liquid outlet 117 is flange-connected with a liquid inlet 108, and the liquid inlet 108 is installed at the lower part of one side of the outer circumference of the kettle body 101, and a pump body 118 is installed in the middle of the liquid pipe 126, and the pump body 118 is fixedly connected to the middle part of one side of the outer circumference of the kettle body 101;

[0044] Furthermore, in a specific implementation, after lithium carbonate is produced, people can open the solenoid valve 127 again to drain the solution, so that the lithium carbonate remains in the inner cylinder 125 and is discharged through the discharge pipe 115. Then people can repeat step S1, and at the same time, the remaining solution from the previous cycle of the kettle body 101 can be extracted through the pump body 118, and is led back to the inner cylinder 125 through the liquid pipe 126, the liquid outlet 117 and the reflux pipe 120 for further circulation. Through reciprocating circulation, the utilization rate of each material and the waste gas lithium iron phosphate battery can be maximized to avoid waste, while reducing the pollution of battery waste, which is beneficial to practical use.

[0045] Among them, a lithium carbonate solution circulation centrifugation method based on the reuse of waste lithium iron phosphate batteries includes the following operating steps;

[0046] S1. First, the waste lithium iron phosphate battery is crushed by a crusher to obtain waste lithium iron phosphate battery powder, and then the crushed powder is introduced into the inner tube 125 through the feed port 105 and the guide tube 124, and then carbonic acid and hydrogen peroxide are injected into the inner tube 125 to form a lithium iron phosphate mixed solution and the motor 106 is started. The motor 106 drives the inner tube 125 to perform centrifugal mixing by using the rotating shaft 122 at a speed of 300 r / min, and the lithium iron phosphate mixed solution is mixed and stirred, and the lithium iron phosphate mixed solution reacts to produce iron phosphate;

[0047] S2, turn off the motor 106, let the inner cylinder 125 settle for 5 minutes, then open the solenoid valve 127, lead the remaining mixed solution out of the inner cylinder 125 and into the kettle body 101, then open the valve on the discharge pipe 115, discharge the remaining iron phosphate in the inner cylinder 125, and collect the iron phosphate through the collection bucket;

[0048] S3, when the remaining mixed solution enters the kettle body 101, the hot air source is started to introduce hot air into the heating tube 107 through the air inlet 119 to heat and concentrate the remaining mixed solution. The heating temperature is 230 degrees Celsius to purify and concentrate the remaining mixed solution;

[0049] S4, opening the valve body on the second liquid outlet 116, leading out the purified mixed solution, filtering and removing impurities from the mixed solution through the filter pump 112, thereby removing impurities in the mixed solution to obtain a pure lithium-containing solution, and the filtered pure lithium-containing solution is guided back into the inner tube 125 through the through pipe 113;

[0050] S5. After the filtered pure lithium-containing solution returns to the inner cylinder 125, sodium carbonate is added to the inner cylinder 125, and the motor 106 is started again to centrifugally mix the inner cylinder 125. The speed of the motor 106 is 500 r / min, and the heating rod at the bottom of the rotating shaft 122 is started. The heating temperature is 300 degrees Celsius. After mixing and heating, the lithium-containing solution reacts with the sodium carbonate to produce lithium carbonate.

[0051] S6, turn off the motor 106 again, let the inner cylinder 125 settle for 5 minutes, then open the solenoid valve 127 again to drain the solution, so that the lithium carbonate remains in the inner cylinder 125 and is discharged through the discharge pipe 115. Then people can repeat the S1 step, and at the same time, the remaining solution of the previous cycle of the kettle body 101 can be extracted through the pump body 118, and guided back to the inner cylinder 125 through the liquid pipe 126, the liquid outlet 117 and the reflux pipe 120 for further circulation.

[0052] Working principle:

[0053] In actual use, people can first crush the waste lithium iron phosphate batteries through a crusher to obtain waste lithium iron phosphate battery powder, and then introduce the crushed powder into the inner tube 125 through the feed port 105 and the guide tube 124, and then inject carbonic acid and hydrogen peroxide into the inner tube 125 to form a lithium iron phosphate mixed solution and start the motor 106. The motor 106 uses the rotating shaft 122 to drive the inner tube 125 for centrifugal mixing at a speed of 300r / min to mix and stir the lithium iron phosphate mixed solution. At this time, the lithium iron phosphate mixed solution undergoes After the reaction produces iron phosphate, the solenoid valve 127 is opened to guide the remaining mixed solution out of the inner cylinder 125 and into the kettle body 101. Then, the valve on the discharge pipe 115 is opened to discharge the remaining iron phosphate in the inner cylinder 125. The iron phosphate is collected by the collection bucket. When the remaining mixed solution enters the kettle body 101, the hot air source is started to introduce hot air into the heating tube 107 through the air inlet 119 to heat and concentrate the remaining mixed solution. The heating temperature is 230 degrees Celsius. The remaining mixed solution is purified and concentrated. At this time, people can open The valve body on the second liquid outlet 116 is opened to guide the purified mixed solution out. The mixed solution can be filtered and impurity-removed by the filter pump 112, so that the impurities in the mixed solution can be removed to obtain a pure lithium-containing solution. The filtered pure lithium-containing solution will be guided back to the inner cylinder 125 through the through pipe 113. When the filtered pure lithium-containing solution returns to the inner cylinder 125, sodium carbonate is added to the inner cylinder 125, and the motor 106 is started again to centrifugally mix the inner cylinder 125. The speed of the motor 106 is 500r / min. And start the heating rod at the bottom of the rotating shaft 122, the heating temperature is 300 degrees Celsius, after mixing and heating, the lithium-containing solution will react with sodium carbonate to produce lithium carbonate, and then people can open the solenoid valve 127 again to guide the solution out, so that the lithium carbonate remains in the inner cylinder 125 and is discharged through the discharge pipe 115, and then people can repeat step S1, and at the same time, the remaining solution of the previous cycle of the kettle body 101 can be extracted through the pump body 118, and is guided back to the inner cylinder 125 through the liquid pipe 126, the liquid outlet 117 and the reflux pipe 120 for recirculation.

[0054] The above shows and describes 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 above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A lithium carbonate solution circulation centrifugal device based on the recycling of waste lithium iron phosphate batteries, comprising an acid precipitation centrifugal kettle (1), characterized in that: The acid precipitation centrifugal kettle (1) comprises a kettle body (101), an end cover (104) is installed on the top of the kettle body (101), a motor (106) is installed in the middle of the top of the end cover (104), a rotating shaft (122) is fixedly connected to the bottom driving end of the motor (106), the bottom of the rotating shaft (122) passes through the top cover (121), the rotating shaft (122) is rotatably connected to the top cover (121), a heating rod is fixedly connected to the bottom of the rotating shaft (122), the heating rod is arranged on the inner side of an inner cylinder (125), the top cover (121) is rotatably connected to the top of the inner cylinder (125), the inner cylinder (125) is arranged in the lower part of the kettle body (101), and a plurality of connecting frames are fixedly connected to the outer periphery of the bottom of the rotating shaft (122). The second connecting frame (128) is fixedly connected to the inner cylinder (125); the upper and lower parts of the outer circumference of the inner cylinder (125) are rotatably connected to the limiting frame (123); the limiting frame (123) is fixedly connected to the lower part of the inner part of the kettle body (101); a return pipe (120) is passed through the upper part of one side of the kettle body (101); the bottom of the return pipe (120) passes through the top of the top cover (121) away from the material guide pipe (124); one end of the return pipe (120) away from the top cover (121) is fixedly connected to a liquid outlet port (117); the liquid outlet port (117) is flange-connected to a liquid passage pipe (126); one end of the liquid passage pipe (126) away from the liquid outlet port (117) is flange-connected to a liquid inlet port (126); (108), the first liquid inlet (108) is installed at the lower part of one side of the outer periphery of the kettle body (101), a pump body (118) is installed in the middle of the liquid passage pipe (126), and the pump body (118) is fixedly connected to the middle part of one side of the outer periphery of the kettle body (101), a heating pipe (107) is spirally wound around the lower part of the outer periphery of the kettle body (101), the upper end of the heating pipe (107) is fixedly connected to an air inlet (119), the lower end of the heating pipe (107) is fixedly connected to an exhaust port (110), the heating pipe (107) is connected to the air inlet (119) through the exhaust port (110), and a hot air source is connected to the heating pipe (107) and the second liquid outlet (116) is fixedly connected to both sides of the middle part of the bottom end of the kettle body (101), and the second liquid outlet (116) is fixedly connected to the middle part of the bottom end of the kettle body (101). The bottom ends of the second liquid outlet (116) are respectively flange-connected to the two ends of the connecting pipe (111); a guide tube (114) is fixedly connected to the middle of one side of the connecting pipe (111); an end of the guide tube (114) away from the connecting pipe (111) is fixedly connected to the inlet end of the filter pump (112); a through pipe (113) is fixedly connected to the outlet end of the filter pump (112); an end of the through pipe (113) away from the filter pump (112) is flange-connected to the second liquid inlet (109); the second liquid inlet (109) is fixedly connected to one side of the lower part of the outer periphery of the kettle body (101); an end of the second liquid inlet (109) away from the through pipe (113) is connected to the interior of the inner cylinder (125) through a rotating sleeve (129);The rotating sleeve (129) is rotatably connected to the lower portion of the outer circumference of the inner cylinder (125), and the filter pump (112) is installed on the lower inner portion of the fixed frame (103).

2. The lithium carbonate solution circulating centrifugal device for recycling discarded lithium iron phosphate batteries according to claim 1, characterized in that: A feed port (105) is provided on one side of the middle portion of the end cover (104); a material guide tube (124) is fixedly connected to the bottom of the feed port (105); the bottom of the material guide tube (124) passes through one side of the middle portion of the top end of the top cover (121); and the feed port (105) is fixedly connected to the top cover (121).

3. The lithium carbonate solution circulating centrifugal device based on the recycling of waste lithium iron phosphate batteries according to claim 1, characterized in that: Evenly distributed electromagnetic valves (127) are installed at the lower part of the outer periphery of the inner cylinder (125), and filter covers are installed at the inner ports of the inner cylinder (125). The interior of the inner cylinder (125) is connected to the interior of the kettle body (101) through the electromagnetic valves (127).

4. The lithium carbonate solution circulating centrifugal device based on the recycling of waste lithium iron phosphate batteries according to claim 1, characterized in that: A discharge pipe (115) is rotatably connected to the middle of the bottom end of the inner cylinder (125) via a sealed bearing. The bottom of the discharge pipe (115) passes through the middle of the bottom end of the kettle body (101). The discharge pipe (115) is fixedly connected to the kettle body (101). A material collecting bucket is provided at the bottom of the discharge pipe (115). A valve body is provided in the middle of the discharge pipe (115).

5. The lithium carbonate solution circulating centrifugal device based on the recycling of waste lithium iron phosphate batteries according to claim 1, characterized in that: The upper part of the outer periphery of the kettle body (101) is fixedly connected with evenly distributed connecting frames 1 (102), and the connecting frames 1 (102) are all fixedly connected to the top of the fixing frame (103), and the middle part of the upper end of the fixing frame (103) is penetrated by the kettle body (101).

6. A lithium carbonate solution circulation centrifugation method based on the reuse of waste lithium iron phosphate batteries, applied to a lithium carbonate solution circulation centrifugation device based on the reuse of waste lithium iron phosphate batteries as claimed in any one of claims 1 to 5, characterized in that: The following steps are included: S1. First, the discarded lithium iron phosphate battery is crushed by a crusher to obtain discarded lithium iron phosphate battery powder, and then the crushed powder is introduced into the inner tube (125) through the feed port (105) and the guide tube (124), and then carbonic acid and hydrogen peroxide are injected into the inner tube (125) to form a lithium iron phosphate mixed solution and the motor (106) is started. The motor (106) drives the inner tube (125) to perform centrifugal mixing by using the rotating shaft (122) at a speed of 300 r / min, and the lithium iron phosphate mixed solution is mixed and stirred, and the lithium iron phosphate mixed solution reacts to produce iron phosphate; S2, turning off the motor (106), allowing the inner cylinder (125) to settle for 5 minutes, then opening the solenoid valve (127), leading the remaining mixed solution out of the inner cylinder (125) and into the kettle body (101), then opening the valve on the discharge pipe (115), discharging the remaining iron phosphate in the inner cylinder (125), and collecting the iron phosphate through a collection bucket; S3, when the remaining mixed solution enters the interior of the kettle body (101), the hot air source is started to introduce hot air into the interior of the heating tube (107) through the air inlet (119), so as to heat and concentrate the remaining mixed solution. The heating temperature is 230 degrees Celsius, so as to purify and concentrate the remaining mixed solution; S4, opening the valve body on the second liquid outlet (116) to discharge the purified mixed solution, filtering and removing impurities from the mixed solution through the filter pump (112), thereby removing impurities in the mixed solution to obtain a pure lithium-containing solution, and the filtered pure lithium-containing solution is guided back into the inner tube (125) through the through pipe (113); S5. After the filtered pure lithium-containing solution returns to the inner cylinder (125), sodium carbonate is added to the inner cylinder (125), and the motor (106) is started again to centrifugally mix the inner cylinder (125). The speed of the motor (106) is 500 r / min, and the heating rod at the bottom of the rotating shaft (122) is started. The heating temperature is 300 degrees Celsius. After mixing and heating, the lithium-containing solution reacts with the sodium carbonate to produce lithium carbonate. S6. Turn off the motor (106) again and allow the inner cylinder (125) to settle for 5 minutes. Then, open the solenoid valve (127) again to drain the solution so that the lithium carbonate remains in the inner cylinder (125) and is discharged through the discharge pipe (115). Then, people can repeat step S1. At the same time, the remaining solution from the previous cycle of the kettle body (101) can be extracted through the pump body (118) and guided back to the inner cylinder (125) through the liquid pipe (126), the liquid outlet (117) and the reflux pipe (120) for further circulation.

Images