Spent sulfuric acid circulating acid washing cooling crystallization configuration centrifugal kettle

Abstract

The application discloses a cooling crystallization and centrifugal kettle for waste sulfuric acid circulation pickling, which comprises a shell, a cover plate is hinged to the top of the shell, a reaction kettle is arranged in the shell, rolling supports are fixed to the bottom of the reaction kettle and abut against the inner bottom wall of the shell, a plurality of electric telescopic rods are fixed to the bottom of the reaction kettle, rollers are rotatably connected to the ends of the electric telescopic rods and tightly abut against the inner wall of the shell, a motor is fixed to the inner bottom wall of the shell, a driving gear is fixedly connected to the output shaft of the motor, and a transmission part is mounted in the middle of the bottom wall of the reaction kettle. The cooling crystallization and centrifugal kettle for waste sulfuric acid circulation pickling can effectively combine the adjusting kettle, the cooling crystallization kettle and the centrifugal machine together, effectively reduce material transfer loss and production time, and effectively improve production efficiency.

Description

Technical Field

[0001] This invention relates to a cooling crystallization and mixing centrifugal reactor, belonging to the technical field of chemical production equipment. Background Technology

[0002] Most domestic cold-drawn steel pipe manufacturers use sulfuric acid pickling. The general pickling process is as follows: 98% concentrated sulfuric acid is added to a tap water tank to dilute the concentrated sulfuric acid to a concentration of 13% to 15%. Then, the diluted sulfuric acid is heated to 55°C to pickle the steel pipe. Once the sulfuric acid concentration in the tank drops below 6%, it becomes waste acid. Waste acid is classified as hazardous waste and can only be removed by an environmental protection company with waste acid treatment qualifications, which is costly.

[0003] To reduce production and environmental operating costs, a waste sulfuric acid freeze crystallization method can be used to recycle waste sulfuric acid. This method mainly involves increasing the acid concentration and lowering the acid temperature. First, concentrated sulfuric acid is added and mixed, then ferrous sulfate is crystallized from the waste liquid through freeze crystallization. The recovered sulfuric acid (regenerated acid) is then reused for pickling. The general process involves pumping the pickling sulfuric acid waste liquid (with a sulfuric acid concentration of approximately 5%) into a mixing tank, then adding approximately 8% (by weight) of 98% sulfuric acid to the mixing tank. After thorough mixing, the mixture is pumped into a freeze crystallization tank, and the temperature is lowered to below 0 degrees Celsius using a freezer. Finally, a centrifuge is used to separate the solid and liquid phases. The liquid is recycled into an acid tank, while the solid ferrous sulfate is sold as a product. This waste acid treatment process requires multiple pieces of equipment, including a mixing tank, a freeze crystallization tank, and a centrifuge.

[0004] Chinese patent document CN102992409A discloses a ferrous sulfate solution freezing crystallization device, including a freezer, a freezing crystallizer, and heat exchange tubes installed in the freezing crystallizer. It also includes a cold capacity regulating tank. This device ensures that the temperature difference between the inlet and outlet water of the heat exchange tubes in the crystallizer remains constant during the freezing process by regulating the water temperature of the zone. That is, the cold capacity supplied to the freezing crystallizer is a constant value. Therefore, the required cooling capacity of the freezer is constant, ensuring the stable operation of the freezer. However, it still needs to be equipped with a mixing tank and a centrifuge. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a cooling crystallization mixing centrifugal kettle for waste sulfuric acid recycling pickling that integrates the functions of blending, cooling crystallization and centrifugation, and has high efficiency in treating waste acid.

[0006] To address the aforementioned technical problems, this invention provides a cooling crystallization centrifugal reactor for waste sulfuric acid recycling and washing, comprising an outer shell with a cover plate hinged to its top. A reaction vessel is disposed inside the outer shell, and a rolling support is fixed to the bottom of the reaction vessel against the inner wall of the outer shell. Multiple electrically operated telescopic rods are fixed to the bottom of the reaction vessel, with rollers rotatably connected to the ends of the telescopic rods and pressed against the inner wall of the outer shell. A motor is fixed to the inner wall of the outer shell, and a drive gear is fixedly connected to the motor's output shaft. A transmission component is installed in the middle of the bottom wall of the reaction vessel, comprising an intermediate gear, a driven gear meshing with the intermediate gear, and... A gear ring is fixedly installed on the outer side of the bottom of the reactor. The driving gear meshes with the intermediate gear and the gear ring in sequence. A transmission shaft is rotatably connected to the middle of the inner bottom wall of the reactor, passing through the bottom of the reactor and fixedly connected to the driven gear. The transmission shaft is equipped with a vibrating element including a sleeve. An anti-reverse component that limits the unidirectional rotation of the electric telescopic rod is fixed on the inner bottom wall of the outer shell. A feed tank is fixed on the top of the inner side wall of the reactor. A fixing component that limits the rotation of the sleeve is fixed on the top of the outer shell. An agitator is fixed on the outer side of the sleeve. The agitator intermittently contacts the bottom of the feed tank and opens the feed tank as the sleeve rotates. A stop plate is fixed on the bottom of the fixing component.

[0007] By incorporating a transmission mechanism and an electric telescopic rod, the motor drives the agitator to rotate via the transmission and vibration components. As the agitator rotates, it causes the feed tank to intermittently discharge material into the reactor for reaction. Simultaneously, the agitator scrapes off crystals that have condensed on the inner wall of the reactor due to cooling by the heat exchange tubes. The operator can also control the electric telescopic rod to eccentrically position the reactor relative to the outer shell. The motor then drives the eccentric reactor to rotate via the transmission mechanism, thus separating the reactants into solid and liquid components. This effectively combines the mixing vessel, cooling crystallizer, and centrifuge, significantly reducing material transfer losses and production time, thereby improving production efficiency.

[0008] Preferably, the rolling support includes a foot fixedly installed at the bottom of the reactor and balls snapped into the bottom of the foot and attached to the inner bottom wall of the outer casing.

[0009] By incorporating feet and ball bearings, the friction between the reactor and the outer shell can be effectively reduced, facilitating the sliding displacement of the reactor within the outer shell.

[0010] Preferably, three electric telescopic rods are provided and fixedly installed at equal intervals in a circular array at the bottom of the reactor, wherein two of the electric telescopic rods extend and retract synchronously, and the third electric telescopic rod extends and retracts in the opposite direction to the aforementioned two electric telescopic rods.

[0011] By setting three electric telescopic rods, each with a different extension length, the relative position of the reactor and the outer shell can be adjusted, thereby centrifugally separating the reactor and the outer shell by setting them off-center.

[0012] Preferably, the intermediate gear is rotatably connected to the bottom of the reactor and meshes with the driving gear, and the driving gear and the driven gear are coaxially arranged and do not contact each other.

[0013] By setting an intermediate gear, the intermediate gear can transmit the power of the driving gear to the driven gear, and at the same time, it can also realize the coaxial rotation of the driving gear and the driven gear.

[0014] Preferably, the outer wall of the reactor is fixed with a heat exchange tube arranged in a spiral shape.

[0015] By setting up heat exchange tubes, the heat exchange tubes can exchange the heat inside the reactor after the materials are mixed, allowing the materials to crystallize directly inside the reactor, effectively avoiding spillage and waste during material transfer and saving material transfer time.

[0016] Preferably, the anti-reverse component includes a mounting box fixed to the bottom wall of the outer casing, a triangular plate with its tip rotatably connected to one side of the inner wall of the mounting box, and a second spring fixedly installed between the bottom of the triangular plate and the bottom wall of the mounting box.

[0017] By setting an anti-reverse component, the triangular plate can cooperate with the third spring to block the reverse electric telescopic rod. After the electric telescopic rod is blocked, it will drive the reactor to stop rotating, thereby realizing the relative rotation between the drive shaft and the reactor.

[0018] Preferably, the stirring component includes a scraper and a stirring plate fixedly connected to the sleeve, and the scraper is in close contact with the inner wall of the reactor.

[0019] By setting up a scraper and a stirring plate, the scraper and stirring plate, which rotate with the sleeve, can mix the materials inside the reactor. At the same time, the scraper can also vibrate up and down to scrape off the crystals on the inner wall of the reactor, so that the temperature of the materials inside the reactor drops evenly.

[0020] Preferably, the bottom of the feed tank is provided with a discharge hole, the feed tank is engaged with a retaining ball located inside the discharge hole, and a third spring is fixed between the retaining ball and the feed tank.

[0021] By setting a locking ball and a third spring, the locking ball can be locked inside the discharge hole under the action of the third spring to restrict the feeding of the feed tank. After the locking ball is pushed, it compresses the third spring and disengages from the discharge hole, and the material inside the feed tank will fall into the reactor.

[0022] Preferably, a slider is fixed to the top of the side wall of the drive shaft, and a groove is provided on the inner wall of the sleeve to cooperate with the slider. The vibrating element also includes a first spring disposed between the sleeve and the drive shaft. An arc-shaped groove is provided on the top of the sleeve, and the abutment is engaged inside the arc-shaped groove.

[0023] By setting up sliders and grooves, when the drive shaft rotates, it can drive the sleeve to rotate through the sliders, without hindering the sleeve from vibrating up and down on the drive shaft. By setting up vibrating components, the rotating sleeve can be pressed down by the back plate and compress the first spring. The first spring will then provide thrust to the sleeve, so the sleeve can vibrate up and down and drive the stirring components to vibrate, which can accelerate the speed of uniform mixing of materials inside the reactor.

[0024] Preferably, the fixing component includes a sliding plate that is slidably connected to the inner wall of the reactor, a locking block that is fixedly installed at the bottom of the sliding plate, and a fourth spring that is fixed between the sliding plate and the outer wall of the reactor. The sleeve side wall is provided with a locking groove that cooperates with the locking block.

[0025] By setting a fixing component, the outer shell and the reactor are eccentrically positioned to abut against the sliding plate. The sliding plate compresses the fourth spring and drives the locking block to insert into the slot, thereby limiting the rotation between the sleeve and the reactor and effectively preventing the sleeve from driving the stirring component to rotate and turbid the centrifugally separated material.

[0026] This invention has positive effects: (1) The waste sulfuric acid circulating acid washing cooling crystallization mixing centrifuge of the present invention, by setting transmission components and electric telescopic rods, allows the user to control the electric telescopic rods to make the reaction vessel eccentric with the outer shell. The motor will drive the eccentric reaction vessel to rotate through the transmission components and then perform solid-liquid separation of the reactants. It can effectively combine the mixing vessel, cooling crystallization vessel and centrifuge, effectively reduce material transfer loss and production time, and effectively improve production efficiency.

[0027] (2) The heat exchange tube of the waste sulfuric acid circulating acid washing cooling crystallization centrifugal kettle of the present invention can reduce the temperature of the reactor after the material is mixed, so that the material crystallizes. The scraper will scrape off the crystals that have condensed on the inner wall of the reactor due to the cooling of the heat exchange tube, so that the temperature of the material inside the reactor drops uniformly and crystallizes quickly.

[0028] (3) The motor of the waste sulfuric acid recycling acid washing cooling crystallization centrifugal kettle of the present invention can drive the stirring plate and scraper to rotate and vibrate through the transmission and vibration components, which can effectively accelerate the mixing speed of the material inside the reactor; when the scraper rotates, it will drive the feed tank to intermittently feed the material into the reactor for reaction, effectively reducing the heat released when all the concentrated sulfuric acid is put into the water.

[0029] (4) When the reaction vessel and the outer shell are eccentric, the outer shell can drive the locking block to hold the sleeve through the sliding plate, effectively preventing relative rotation between the sleeve and the reaction vessel, and effectively avoiding the sleeve from rotating and stirring the solid-liquid separation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of part A in the middle; Figure 4 This is a cross-sectional structural diagram of an embodiment of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of part B in the middle; Figure 6 This is a schematic diagram of the vibration component structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the anti-reverse component structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the feed tank structure according to an embodiment of the present invention.

[0031] The above figures are labeled as follows: 1. Outer shell; 2. Cover plate; 3. Reactor; 4. Rolling support; 41. Foot; 42. Ball bearings; 5. Electric telescopic pole; 51. Roller; 6. Motor; 61. Drive gear; 7. Transmission components; 71. Intermediate gear; 72. Driven gear; 8. Drive shaft; 81. Slider; 9. Vibrating component; 91. Sleeve; 92. Slide groove; 93. First spring; 94. Arc groove; 10. Card slot; 11. Anti-reverse component; 111. Mounting box; 112. Triangular plate; 113. Second spring; 12. Feed tank; 121. Discharge port; 122. Ball catcher; 123. Third spring; 13. Heat exchanger tubes; 14. Fixing component; 141. Slide plate; 142. Fourth spring; 143. Locking block; 15. Mixing component; 151. Scraper; 152. Mixing plate; 16. Support plate. Detailed Implementation Example

[0032] The waste sulfuric acid recycling pickling cooling crystallization centrifuge in this embodiment solves the problem of low production efficiency caused by the need for multiple machines in the prior art for waste liquid treatment. By integrating the mixing tank, cooling crystallization tank and centrifuge together, the waste liquid treatment rate is effectively improved.

[0033] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0034] Reference Figures 1-3 A centrifugal reactor for cooling crystallization and preparation of waste sulfuric acid recycling acid washing includes an outer shell 1. A cover plate 2 is hinged to the top of the outer shell 1. A handle can be provided on the cover plate 2 for easy operation. A reaction vessel 3 is arranged inside the outer shell 1. The bottom of the cover plate 2 is in close contact with the top of both the outer shell 1 and the reaction vessel 3 to prevent leakage caused by gaps between the reaction vessel 3 and the cover plate 2. A rolling support 4 is fixed to the bottom of the reaction vessel 3 and abuts against the inner bottom wall of the outer shell 1. The rolling support 4 includes a foot 41 fixedly installed at the bottom of the reaction vessel 3 and a ball bearing 42 engaged at the bottom of the foot 41 and the inner bottom wall of the outer shell 1. A groove is opened at the bottom of the foot 41, and the ball bearing 42 is directly engaged in the groove to facilitate rotation of the ball bearing 42 in multiple directions. When the reaction vessel 3 moves inside the outer shell 1, the ball bearing 42 will roll with the outer shell 1, reducing the friction force on the reaction vessel 2.

[0035] Reference Figure 4 Multiple electric telescopic rods 5 are fixed at the bottom of the reactor 3. The ends of the electric telescopic rods 5 are rotatably connected to rollers 51 that are in close contact with the inner wall of the outer shell 1. When the reactor 3 rotates, the rollers 51 will roll against the inner wall of the outer shell 1 to reduce the vibration between the reactor 3 and the outer shell 1 and ensure the stability of the reactor 3. There are three electric telescopic rods 5 arranged in a circular array and fixed at equal intervals at the bottom of the reactor 3. Two of the electric telescopic rods 5 extend and retract synchronously, and the third electric telescopic rod 5 extends and retracts in the opposite direction to the two electric telescopic rods 5. When all the electric telescopic rods 5 are of the same length, the outer shell 1 and the reactor 3 are coaxial. When one electric telescopic rod 5 shortens, the other two electric telescopic rods 5 extend. After being pushed by the extended electric telescopic rod 5, the reactor 3 will move towards the outer shell 1 to achieve eccentricity with the outer shell 1.

[0036] The outer wall of the reactor 3 is fixed with a spiral heat exchange tube 13. When concentrated sulfuric acid flows into the reactor 3, it will release heat. At this time, the heat exchange tube 13 can exchange the heat inside the reactor 3 to facilitate rapid crystallization in the subsequent crystallization process.

[0037] Reference Figures 4-5A motor 6 is fixed to the bottom wall of the outer shell 1. The output shaft of the motor 6 is fixedly connected to a drive gear 61. A transmission component 7 is installed in the middle of the bottom wall of the reactor 3. The transmission component 7 includes an intermediate gear 71, a driven gear 72 meshing with the intermediate gear 71, and a gear ring 73 fixedly installed on the outer side of the bottom of the reactor 3. The teeth of the gear ring 73 are internal teeth. The drive gear 61 meshes with the intermediate gear 71 and the gear ring 73 in sequence. When the reactor 3 is coaxial with the outer shell 1, the drive gear 61 meshes with the intermediate gear 71. When the reactor 3 is eccentric with the outer shell 1, the drive gear 61 meshes with the intermediate gear 71. 1. It meshes with the gear ring 73; the intermediate gear 71 is rotatably connected to the bottom of the reactor 3 and meshes with the driving gear 61. The thickness of the intermediate gear 71 is greater than the sum of the thicknesses of the driving gear 61 and the driven gear 72, so as to facilitate stable meshing between the intermediate gear 71, the driving gear 61 and the driven gear 72; the driving gear 61 and the driven gear 72 are coaxially arranged and do not contact each other. The driving gear 61 and the driven gear 72 have the same size; a transmission shaft 8 is rotatably connected to the middle of the bottom wall of the reactor 3, passing through the bottom of the reactor 3 and fixedly connected to the driven gear 72.

[0038] Reference Figure 6 The drive shaft 8 is equipped with a vibrating element 9 including a sleeve 91. A slider 81 is fixed to the top of the side wall of the drive shaft 8. A groove 92 that cooperates with the slider 81 is opened on the inner wall of the sleeve 91. The height of the groove 92 is greater than the height of the slider 81, and the inner wall of the groove 92 is in close contact with the outer wall of the slider 81, so that the drive shaft 8 can drive the sleeve 91 to rotate through the slider 81. At the same time, it is also convenient for the sleeve 91 to slide along the slider 81 and the drive shaft 8.

[0039] Reference Figure 3 and Figure 6 The top of the outer shell 1 is fixed with a fixing member 14 that restricts the rotation of the sleeve 91. The fixing member 14 includes a sliding plate 141 that is slidably connected to the inner wall of the reactor 3, a locking block 143 fixedly installed at the bottom of the sliding plate 141, and a fourth spring 142 fixed between the sliding plate 141 and the outer wall of the reactor 3. The side wall of the sleeve 91 is provided with a slot 10 that cooperates with the locking block 143. The fourth spring 142 can open the sliding plate 141 and the reactor 3 to prevent the locking block 143 from being inserted into the slot 10 when the reactor 3 and the outer shell 1 are coaxial. When the reactor 3 and the outer shell 1 are eccentric, the outer shell 1 will compress the fourth spring 142 to make the locking block 143 insert into the slot 10.

[0040] Reference Figures 2-3 as well as Figure 6A stirring element 15 is fixed to the outside of the sleeve 91. The stirring element 15 includes a scraper 151 and a stirring plate 152 fixedly connected to the sleeve 91. The rotation of the stirring plate 152 can evenly mix the materials inside the reactor 3 and make the temperature of the materials inside the reactor 3 drop evenly during the crystallization step. The scraper 151 is in close contact with the inner wall of the reactor 3 and is arranged in a spiral shape. During the crystallization step, the scraper 151 can scrape off the crystals adhering to the inner wall of the reactor 3. At the same time, the scraper 151 vibrates along with the vibrating element 91. During vibration, the scraper can scrape up and down, thereby improving the efficiency of scraping crystals and preventing the internal heat from being unable to dissipate in time due to crystallization on the inner wall of the reactor 3. The scraper 151 rotates with the sleeve 91 and intermittently contacts the bottom of the feed tank 10 and opens the feed tank 12. The rotating scraper 151 will press against the top of the retaining ball 122 to retract it into the feed tank 12. Then, the concentrated sulfuric acid in the feed tank 12 flows into the reactor 3 along the scraper 151, which can reduce the intensity of the reaction between concentrated sulfuric acid and waste acid and ensure the safety of the reaction.

[0041] The vibrating element 9 also includes a first spring 93 disposed between the sleeve 91 and the drive shaft 8. The two ends of the first spring 93 are in close contact with the top of the drive shaft 8 and the inner wall of the sleeve 91, respectively, so that the first spring 93 can push the sleeve 92 upward. The top of the sleeve 91 is provided with an arc-shaped groove 94. The bottom of the slide plate 141 is fixed with a stop plate 16 that cooperates with the sleeve 91. The bottom of the stop plate 16 is arc-shaped and is engaged in the arc-shaped groove 94. The rotating sleeve 91 is held by the stop plate 16 and pressed down to compress the first spring 93. At this time, the stop plate 16 is disengaged from the arc-shaped groove 94. After the first spring 93 is compressed, it will push back the sleeve 91 so that the stop plate 16 is engaged in the arc-shaped groove 94 again, so that the sleeve 91 vibrates when it rotates. The sleeve 91 will drive the stirring plate 152 and the scraper 151 to rotate and vibrate.

[0042] Reference Figure 7 An anti-reverse component 11, which limits the one-way rotation of the electric telescopic rod 5, is fixed to the bottom wall of the outer casing 1. The anti-reverse component 11 includes a mounting box 111 fixed to the bottom wall of the outer casing 1, a triangular plate 112 whose tip is rotatably connected to one side of the inner wall of the mounting box 111, and a second spring 113 fixedly installed between the bottom of the triangular plate 112 and the bottom wall of the mounting box 111. Since the tip of the triangular plate 112 is limited by the mounting box 111, the second spring 113 can push the triangular plate 112 upward so that the triangular plate 112 stands upright inside the mounting box 111. When the electric telescopic rod 5 reverses, it will be blocked by the right angle side of the triangular plate 112 and stop rotating. When the electric telescopic rod 5 reverses, it can abut against the hypotenuse of the triangular plate 112 and force the triangular plate 112 to rotate and compress the second spring 113. At this time, the triangular plate 112 retracts into the mounting box 111 and no longer obstructs the rotation of the electric telescopic rod 5.

[0043] Reference Figure 8A feed tank 12 is fixed to the top of the inner wall of the reactor 3. Concentrated sulfuric acid is placed inside the feed tank 12. A discharge hole 121 is opened at the bottom of the feed tank 12. A retaining ball 122 is clamped inside the discharge hole 121. In order for the retaining ball 122 to completely block the discharge hole 121, the diameter of the retaining ball 122 must be larger than the diameter of the discharge hole 121. A third spring 123 is fixed between the retaining ball 122 and the feed tank 12. The third spring 123 will press the retaining ball downward to keep the retaining ball 122 stably clamped in the discharge hole 121 to prevent concentrated sulfuric acid from leaking. When the retaining ball 122 is pushed upward, it will disengage from the discharge hole 121, and at this time the concentrated sulfuric acid will flow out from the discharge hole 121.

[0044] Working principle: After the user puts the waste acid into the reactor 3 and closes the cover plate 2, the motor 6 is started to drive the drive gear 61 to rotate. The drive gear 61 drives the vibrating element 9 to rotate through the intermediate gear 71 and the driven gear 72. At this time, the vibrating element 9 will drive the reactor 3 to rotate due to friction. Then the triangular plate 112 will lock the electric telescopic rod 5 to limit the rotation of the reactor 3. Then the driven gear 72 will drive the vibrating element 9 to rotate relative to the reactor 3.

[0045] When the drive shaft 8 drives the sleeve 91 to rotate via the slider 81, the sleeve 91 will vibrate under the action of the abutment plate 16 and the first spring 93. Then the sleeve 91 drives the scraper 151 and the stirring plate 152 to rotate. During the rotation, the scraper 151 will intermittently push the ball 122 to release the concentrated sulfuric acid inside the feed tank 12. The concentrated sulfuric acid will flow into the reactor 3 in multiple times along the scraper 151. When the sulfuric acid inside the feed tank 12 has completely entered the reactor 3, the heat exchange tube 13 absorbs the heat generated by the reactor 3. Then the material inside the reactor 3 crystallizes at a low temperature, and the crystals will adhere to the inner wall of the reactor 3. At this time, the rotating scraper 151 will scrape off the crystals on the inner wall of the reactor 3 to achieve a uniform decrease in material temperature.

[0046] After the material crystallizes, the operator can control the electric telescopic rod 5 to extend to different lengths. The electric telescopic rod 5 of different lengths will cause the outer shell 1 and the reactor 3 to be eccentric. Then, the drive gear 61 meshes with the gear ring 73, and the motor 6 will drive the reactor 3 to rotate eccentrically inside the outer shell 1 through the drive gear 61 and the gear ring 73. At this time, the motor 6 reverses, and the electric telescopic rod 5 will press the triangular plate 112 to rotate and compress the second spring 113. The triangular plate 112 will retract into the mounting box 111 to avoid obstructing the rotation of the reactor 3. The material inside the eccentrically rotating reactor 3 will achieve solid-liquid separation, thereby separating the acid liquid from the solid ferrous sulfate product. Multiple process steps are achieved through highly centralized machinery, which effectively reduces material loss and increases production rate.

[0047] The surfaces of the reactor 3, feed tank 12, and other components in contact with the acid solution in the waste sulfuric acid recycling acid washing cooling crystallization centrifugal reactor of the present invention are all coated with tetrafluoroethylene.

[0048] Obviously, the above embodiments are merely examples to clearly illustrate the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A cooling crystallization centrifuge for waste sulfuric acid recycling and pickling, comprising an outer shell (1), characterized in that, The top of the outer shell (1) is hinged with a cover plate (2). A reaction vessel (3) is installed inside the outer shell (1). A rolling support (4) is fixed to the bottom of the reaction vessel (3) and abuts against the inner bottom wall of the outer shell (1). Multiple electric telescopic rods (5) are fixed to the bottom of the reaction vessel (3). The ends of the electric telescopic rods (5) are rotatably connected to rollers (51) that are in close contact with the inner wall of the outer shell (1). A motor (6) is fixed to the inner bottom wall of the outer shell (1). The output shaft of the motor (6) is fixedly connected to a drive gear (61). A transmission component (7) is installed in the middle of the bottom wall of the reaction vessel (3). The transmission component (7) includes an intermediate gear (71), a driven gear (72) meshing with the intermediate gear (71), and a gear ring (73) fixedly installed on the outer side of the bottom of the reaction vessel (3). The drive gear (61) sequentially meshes with the intermediate gear (71) and the driven gear (72) meshing with the intermediate gear (71). The intermediate gear (71) and the gear ring (73) mesh. The middle part of the inner bottom wall of the reactor (3) is rotatably connected to the transmission shaft (8) that passes through the bottom of the reactor (3) and is fixedly connected to the driven gear (72). The transmission shaft (8) is provided with a vibrating element (9) including a sleeve (91). The inner bottom wall of the outer shell (1) is fixed with an anti-reverse component (11) that limits the one-way rotation of the electric telescopic rod (5). The top of the inner side wall of the reactor (3) is fixed with a feed tank (12). The top of the outer shell (1) is fixed with a fixing component (14) that limits the rotation of the sleeve (91). The outside of the sleeve (91) is fixed with a stirring component (15). The stirring component (15) rotates with the sleeve (91) and intermittently contacts the bottom of the feed tank (12) and opens the feed tank (12). The bottom of the fixing component (14) is fixed with a stop plate (16).

2. The waste sulfuric acid recycling acid washing cooling crystallization centrifuge according to claim 1, characterized in that, The rolling support (4) includes a foot (41) fixedly installed at the bottom of the reactor (3) and a ball bearing (42) snapped into the bottom of the foot (41) and attached to the inner bottom wall of the outer shell (1).

3. The waste sulfuric acid recycling acid washing cooling crystallization centrifuge according to claim 1, characterized in that, Three electric telescopic rods (5) are provided and are fixedly installed at equal intervals in a circular array at the bottom of the reactor (3). Two of the electric telescopic rods (5) extend and retract synchronously, while the other electric telescopic rod (5) extends and retracts in the opposite direction to the other two electric telescopic rods (5).

4. The waste sulfuric acid recycling acid washing cooling crystallization centrifuge according to claim 1, characterized in that, The intermediate gear (71) is rotatably connected to the bottom of the reactor (3) and meshes with the drive gear (61). The drive gear (61) and the driven gear (72) are coaxially arranged and do not contact each other.

5. The waste sulfuric acid circulating acid washing cooling crystallization centrifuge according to claim 1, characterized in that, The outer wall of the reactor (3) is fixed with a heat exchange tube (13) arranged in a spiral shape.

6. The waste sulfuric acid recycling acid washing cooling crystallization centrifuge according to claim 1, characterized in that, The anti-reverse component (11) includes a mounting box (111) fixed to the bottom wall of the outer shell (1), a triangular plate (112) with its tip rotatably connected to one side of the inner wall of the mounting box (111), and a second spring (113) fixedly installed between the bottom of the triangular plate (112) and the bottom wall of the mounting box (111).

7. The waste sulfuric acid circulating acid washing cooling crystallization centrifuge according to claim 1, characterized in that, The stirring component (15) includes a scraper (151) and a stirring plate (152) fixedly connected to the sleeve (91), and the scraper (151) is in close contact with the inner wall of the reactor (3).

8. The waste sulfuric acid recycling acid washing cooling crystallization centrifuge according to claim 7, characterized in that, The feed tank (12) has a discharge hole (121) at the bottom. The feed tank (12) is fitted with a retaining ball (122) located inside the discharge hole (121). A third spring (123) is fixed between the retaining ball (122) and the feed tank (12).

9. The waste sulfuric acid circulating acid washing cooling crystallization centrifuge according to claim 1, characterized in that, The top of the side wall of the drive shaft (8) is fixed with a slider (81), and the inner wall of the sleeve (91) is provided with a groove (92) that cooperates with the slider (81). The vibrating element (9) also includes a first spring (93) provided between the sleeve (91) and the drive shaft (8). The top of the sleeve (91) is provided with an arc groove (94), and the abutment (16) is engaged inside the arc groove (94).

10. The waste sulfuric acid recycling acid washing cooling crystallization centrifuge according to claim 9, characterized in that, The fastener (14) includes a sliding plate (141) that is slidably connected to the inner wall of the reactor (3), a locking block (143) that is fixedly installed at the bottom of the sliding plate (141), and a fourth spring (142) that is fixed between the sliding plate (141) and the outer wall of the reactor (3). The sleeve (91) has a slot (10) on its side wall that cooperates with the locking block (143).

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