A zinc sulfate impurity removal device

Abstract

The application discloses a zinc sulfate impurity removal device, which comprises a crude reaction kettle, an auxiliary material tank, a mixing tank and a refined reaction kettle, a feeding mechanism is installed in the mixing tank, the feeding mechanism comprises a conical feeding port, a sealing stop block, a connecting rod, a feeding cover, a sealing sliding block, a positioning baffle, a sealing sliding groove and a sealing spring, a scraping mechanism is arranged at the bottom of the inner cavity of the crude reaction kettle, an installation block and a transmission cavity are arranged at the bottom of the refined reaction kettle, and a timing mechanism is installed in the installation block and the transmission cavity, the feeding mechanism can automatically control the feeding speed of the auxiliary material according to the feeding speed of the crude zinc sulfate solution, so that the impurity removal reaction of the zinc sulfate solution is more accurately controlled, and high-purity zinc sulfate solution is obtained, and the timing mechanism controls the stirring reaction time, so that the reaction condition is better controlled, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of zinc sulfate production devices, in particular to a zinc sulfate impurity removal device. BACKGROUND

[0002] Zinc sulfate (chemical formula: ZnSO4) is the most important zinc salt, is colorless orthorhombic crystal or white powder, and its heptahydrate (ZnSO4.7H2O) is commonly known as alunite, is a natural mineral, and the zinc sulfate is a main raw material for manufacturing zinc white and zinc salt, can also be used as a printing and dyeing mordant, a wood and leather preservative, and is an important auxiliary raw material for producing viscose fibers and vinylon fibers. In addition, the zinc sulfate has applications in the electroplating and electrolysis industries, and can also be used for manufacturing cables.

[0003] In the prior art, zinc oxide and sulfuric acid are generally used to produce zinc sulfate, and the formed zinc sulfate solution often contains iron, manganese, lead, nickel, cadmium and other impurities. Generally speaking, iron, manganese and other impurities are easy to remove, while lead, nickel and cadmium are not easy to remove, which affects the product quality. The existing measures are to replace the zinc powder according to the principle that the activity of nickel and cadmium is greater than that of hydrogen and less than that of zinc, but the replacement is easy to produce reverse dissolution. The existing zinc sulfate impurity removal method, such as patent application 2019110644370, discloses a zinc sulfate impurity removal method, which needs to add sodium dimethyldithiocarbamate and thiourea, then heating and stirring for 1.5h, and filtering to obtain refined zinc sulfate solution. For the production process, it is difficult for the existing production device to meet the production raw materials to be added in proportion, and the stirring and heating time is usually controlled by people. In view of the above problems, the application provides a solution. SUMMARY

[0004] The application aims to provide a zinc sulfate impurity removal device.

[0005] The above technical purpose of the application is realized by the following technical scheme:

[0006] The application discloses a zinc sulfate impurity removing device, which comprises a crude reaction kettle, an auxiliary material tank, a mixing tank and a refined reaction kettle, wherein the crude reaction kettle is internally provided with a crude stirrer, the crude stirrer is in transmission connection with a crude stirring motor arranged at the top of the crude reaction kettle, the top of the crude reaction kettle is further provided with a solid feeding port and a liquid feeding port, the bottom of the crude reaction kettle is provided with a crude impurity outlet and a crude liquid outlet, the crude liquid outlet is provided with a crude filter screen at the outlet position, the crude liquid outlet is connected with the mixing tank through a feeding pipe, the feeding pipe is provided with a feeding pump, the auxiliary material tank is arranged above the mixing tank, the mixing tank is arranged at the top of the refined reaction kettle, the refined reaction kettle is internally provided with a refined stirrer, the refined stirrer is in transmission connection with a refined stirring motor arranged at the bottom of the refined reaction kettle, the bottom of the refined reaction kettle is provided with a refined liquid outlet and a refined impurity outlet, the refined liquid outlet is provided with a refined filter screen at the outlet position, the mixing tank is internally provided with a feeding mechanism, the feeding mechanism comprises a conical feeding port, a sealing block, a connecting rod, a feeding cover, a sealing sliding block, a positioning baffle, a sealing sliding groove and a sealing spring, the feeding cover is arranged at the top of the mixing tank, the upper end of the feeding cover is connected with the auxiliary material tank through an auxiliary material inlet, the bottom of the feeding cover is communicated with the inner cavity of the mixing tank through the sealing sliding groove, the sealing sliding groove is provided with a T-shaped sealing sliding block, the positioning baffle is arranged above the sealing sliding groove, the both ends of the positioning baffle are fixedly connected with the feeding cover, one end of the sealing sliding block is inserted into the lower part of the positioning baffle, the sealing spring is arranged between the positioning baffle and the sealing sliding groove, the both ends of the sealing spring are inserted into the mounting holes of the sealing sliding block and the feeding cover respectively, the contact surfaces of the positioning baffle, the sealing sliding groove, the feeding cover and the positioning baffle are sealed through a sealing structure, the bottom of the sealing sliding block is fixedly connected with one end of an L-shaped connecting rod, the other end of the connecting rod is connected with the sealing block, the sealing block extends into the conical feeding port, the feeding pipe is connected with the mixing tank through the conical feeding port, when the sealing spring pushes the sealing sliding block to the end of the sealing sliding groove and separates the inner cavity of the feeding cover from the mixing tank completely, the sealing block is sealed with the inner wall of the conical feeding port, the feeding pump pumps the crude zinc sulfate solution to extrude the sealing block to move, the movement of the sealing block drives the movement of the sealing sliding block and extrudes the sealing spring, so that the sealing sliding groove is partially opened, and the liquid amount passing through the gap between the conical feeding port and the sealing block per unit time is proportional to the opening length of the sealing sliding groove; the bottom of the inner cavity of the crude reaction kettle is provided with a scraping mechanism; the bottom of the refined reaction kettle is provided with a mounting block and a transmission cavity, the lower end of the refined stirring shaft penetrates through the transmission cavity and is in transmission connection with the refined stirring motor arranged at the bottom of the transmission cavity, the mounting block and the transmission cavity are internally provided with a timing mechanism, and the timing mechanism controls the stirring reaction time of the refined reaction kettle.

[0007] Further, the timing mechanism comprises a partial bevel gear, a bevel gear, a timing slider, a conductive contact piece one, a timing sliding cavity, a timing sliding slot, a transmission screw and a conductive contact piece two. The partial bevel gear is installed on the refined stirring shaft in the transmission cavity. The timing slider is installed in the timing sliding cavity. The timing sliding slot is arranged on the upper and lower sides of the timing sliding cavity. The upper and lower sides of the timing slider are provided with sliding ears matched with the timing sliding slot. Each of the upper and lower sliding ears is provided with a conductive contact piece one. The two conductive contact pieces one are connected through a wire. The middle of the timing slider is provided with a threaded hole matched with the transmission screw. The middle section of the transmission screw is provided with a thread. The two ends of the transmission screw are installed on the mounting block through bearings. The timing sliding cavity is arranged inside the mounting block. One end of the transmission screw extends out of the mounting block. The other end of the transmission screw extends into the transmission cavity. The bevel gear is installed on the end of the end of the transmission screw extending into the transmission cavity. The bevel gear is engaged with the partial bevel gear. One end of the timing sliding slot is provided with a conductive contact piece two. The two conductive contact pieces two are connected in series in the control circuit. The partial bevel gear and the bevel gear are engaged and driven to rotate the transmission screw. The timing slider is matched with the transmission screw in a threaded manner, so that the timing slider moves in the timing sliding cavity. When the conductive contact piece one contacts the conductive contact piece two, the control circuit is connected, and an electrical signal is transmitted to the controller. After receiving the electrical signal, the controller controls the refined stirring motor circuit to be disconnected, so that the stirring reaction is controlled in time.

[0008] Further, the scraping mechanism comprises a partial gear, a transmission gear, a transmission shaft, a mounting rod, a spring, a scraping plate and a transmission pin. The partial gear is installed at the bottom of the crude stirrer. The transmission shaft is installed on the mounting rod through bearings. The mounting rod is fixedly installed on the inner side wall of the crude reaction kettle. The transmission gear is installed at the top of the transmission shaft and engaged with the partial gear. The bottom of the transmission shaft is provided with a transmission hole. The upper end of the scraping plate is provided with a transmission rod with the same diameter as the transmission shaft. The upper end of the transmission rod is provided with a transmission pin matched with the transmission hole. The spring is sleeved outside the transmission shaft below the transmission rod and the mounting rod. The spring pushes the scraping plate to be attached to the crude filter screen through the elastic force of the spring.

[0009] Further, one end of the transmission screw extending out of the mounting block is provided with a hexagonal slot.

[0010] Further, the refined reaction kettle is provided with a scraping mechanism with the same structure as that in the crude reaction kettle, and the scraping mechanism is installed on the refined stirring shaft.

[0011] Preferably, the outer sides of the crude reaction kettle, the auxiliary material tank, the mixing tank and the refined reaction kettle are provided with mounting seats, and the mounting seats are fixed on the mounting frame through the mounting seats.

[0012] Preferably, the outer sides of the refined reaction kettle and the crude reaction kettle are provided with heating jackets.

[0013] Preferably, the sealing rubber layer is arranged on the surface of the sealing sliding block in contact with the upper end of the sealing sliding groove on both sides, and the sealing strip is arranged on the inner wall of the positioning baffle and the feeding cover to seal the sealing sliding block.

[0014] In summary, the present application has the following advantages:

[0015] 1、The feeding mechanism can automatically control the feeding speed of the auxiliary material according to the feeding speed of the crude zinc sulfate solution, so as to more accurately control the impurity removal reaction of the zinc sulfate solution and obtain high-purity zinc sulfate solution.

[0016] 2、The timing mechanism controls the stirring reaction time, so as to better control the reaction conditions and improve the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 is a schematic diagram of the bottom structure of the crude reaction kettle;

[0019] Figure 3 is a connection structure diagram of the scraping plate;

[0020] Figure 4 is a schematic diagram of the local gear meshing structure;

[0021] Figure 5 is a schematic diagram of the feeding mechanism part of the mixing tank;

[0022] Figure 6 is a top view of the mixing tank;

[0023] Figure 7 is a schematic diagram of the installation structure of the sealing sliding block;

[0024] Figure 8 is a schematic diagram of the structure of the timing mechanism;

[0025] Figure 9 is a schematic diagram of the installation of the timing sliding block;

[0026] Figure 10 is a schematic diagram of the local bevel gear structure.

[0027] In the figure, 1, crude reactor; 2, auxiliary material tank; 3, mixing tank; 4, refined reactor; 5, crude stirring motor; 6, solid feed port; 7, liquid feed port; 8, crude stirrer; 9, mounting base; 10, crude impurity outlet; 11, crude liquid outlet; 12, feed pipe; 13, feed pump; 14, feed mechanism; 15, refined stirrer; 16, refined stirring motor; 17, refined liquid outlet; 18, refined filter; 19, refined impurity outlet; 20, timing mechanism; 21, heating jacket; 22, local gear; 23, transmission gear; 24, transmission shaft; 25, mounting rod; 26, spring; 27, scraper; 28. Transmission latch; 29. ​​Coarse filter; 30. Transmission socket; 31. Conical feed port; 32. Sealing block; 33. Connecting rod; 34. Feed cover; 35. Sealing slider; 36. Positioning baffle; 37. Sealing chute; 38. Sealing spring; 39. Auxiliary material inlet; 40. Sealing strip; 41. Mounting block; 42. Transmission cavity; 43. Refined stirring shaft; 44. Partial bevel gear; 45. Bevel gear; 46. Timing slider; 47. Conductive contact piece 1; 48. Timing slide cavity; 49. Timing chute; 50. Transmission screw; 51. Conductive contact piece 2; 52. Hexagonal slot; 53. Threaded hole; 54. Sliding ear; 55. Bevel gear. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] A zinc sulfate impurity removal device, such as Figure 1 As shown, it includes a crude reactor 1, an auxiliary material tank 2, a mixing tank 3 and a refined reactor 4. A crude stirrer 8 is installed in the crude reactor 1. The crude stirrer 8 is connected to the crude stirring motor 5 on the top of the crude reactor 1. The top of the crude reactor 1 is also provided with a solid feed port 6 and a liquid feed port 7. The solid feed port 6 is provided with a cover plate. When no material is fed, the cover plate is closed. The liquid feed port 7 can be installed with a pipe joint to pump liquid feed through the pipeline. The bottom of the crude reactor 1 is provided with a crude impurity outlet 10 and a crude liquid outlet 11. Both the crude impurity outlet 10 and the crude liquid outlet 11 are provided with valves, preferably electromagnetic control valves. The outlet position of the crude liquid outlet 11 is provided with a crude filter screen 29. Figure 2The medium coarse filter screen 29 is conical structure, coarse liquid outlet 11 through the feed pipe 12 and mixing tank 3 is connected, the feed pump 13 is installed on the feed pipe 12, the auxiliary material tank 2 is installed above the mixing tank 3, the mixing tank 3 is installed on the top of the refining reactor 4, the valve is arranged between the auxiliary material tank 2 and the mixing tank 3, the valve is also arranged between the mixing tank 3 and the refining reactor 4, the refining reactor 4 is installed with the refining stirrer 15, the refining stirrer 15 is drivingly connected with the refining stirring motor 16 installed at the bottom of the refining reactor 4, the bottom of the refining reactor 4 is installed with the refining liquid outlet 17 and the refining impurity outlet 19, the same refining liquid outlet 17 and refining impurity outlet 19 are provided with valves, controller opening and closing, the outlet position of the refining liquid outlet 17 is installed with the refining filter screen 18, the mixing tank 3 is installed with the feeding mechanism 14, please refer to Figure 5 、 Figure 6 and Figure 7 , the feeding mechanism 14 includes conical feed port 31, sealing block 32, connecting rod 33, feed cover 34, sealing sliding block 35, positioning baffle 36, sealing sliding groove 37 and sealing spring 38, the feed cover 34 is arranged at the top of the mixing tank 3, the upper end of the feed cover 34 is connected with the auxiliary material tank 2 through the auxiliary material inlet 39, the bottom of the feed cover 34 is communicated with the inner cavity of the mixing tank 3 through the sealing sliding groove 37, the sealing sliding groove 37 is installed with the sealing sliding block 35 of “T” shape, the positioning baffle 36 is arranged above one side of the sealing sliding groove 37, the both ends of the positioning baffle 36 are fixedly connected with the feed cover 34, one end of the sealing sliding block 35 is inserted into the lower side of the positioning baffle 36 (the bottom of the sealing sliding block 35 is inserted into the sealing sliding groove 37), the sealing spring 38 is installed between the positioning baffle 36 and the sealing sliding groove 37, both ends of the sealing spring 38 are respectively inserted into the mounting hole of the sealing sliding block 35 and the feed cover 34, the contact surface of the positioning baffle 36, the sealing sliding groove 37, the feed cover 34 and the positioning baffle 36 is sealed by sealing structure, please refer to Figure 7The surface of the sealing sliding block 35 in contact with the upper end of the sealing sliding groove 37 is provided with a sealing rubber layer, and the positioning baffle 36 and the inner wall of the feeding cover 34 are provided with a sealing strip 40 in contact with the sealing sliding block 35. The bottom of the sealing sliding block 35 is fixedly connected with one end of the “L”-shaped connecting rod 33, the other end of the connecting rod 33 is connected with the sealing block 32, the sealing block 32 extends into the conical feeding port 31, and the feeding pipe 12 is connected with the mixing tank 3 through the conical feeding port 31. When the sealing spring 38 pushes the sealing sliding block 35 to the end of the sealing sliding groove 37, and the inner cavity of the feeding cover 34 is completely separated from the mixing tank 3, the sealing block 32 is in contact with the inner wall of the conical feeding port 31. When the feeding pump pumps the crude zinc sulfate solution to press the sealing block 32 to move, the movement of the sealing block 32 drives the sealing sliding block 35 to move and press the sealing spring 38, so that the sealing sliding groove 37 is partially opened. At this time, the amount of liquid passing through the gap between the conical feeding port 31 and the sealing block 32 per unit time is proportional to the opening length of the sealing sliding groove 37, that is, the crude zinc sulfate and the auxiliary materials are added in proportion, so when designing, the matching between various parameters should be considered to meet the above requirements.

[0030] As shown in Figure 2 and Figure 3 , the inner cavity bottom of the crude reaction kettle 1 is provided with a scraping mechanism; the scraping mechanism includes a partial gear 22, a transmission gear 23, a transmission shaft 24, a mounting rod 25, a spring 26, a scraping plate 27 and a transmission pin 28. The circumference of the partial gear 22 is partially provided with teeth, for example, one-third or one-fourth of the circumference is provided with teeth, as shown in Figure 4 , the partial gear 22 is installed at the bottom of the crude stirrer 8, the transmission shaft 24 is installed on the mounting rod 25 through a bearing, the mounting rod 25 is fixedly installed on the inner side wall of the crude reaction kettle 1, the transmission gear 23 is installed at the top of the transmission shaft 24 and engages with the partial gear 22, the bottom of the transmission shaft 24 is provided with a transmission hole 30, the upper end of the scraping plate 27 is provided with a transmission rod with the same diameter as the transmission shaft 24, the upper end of the transmission rod is provided with a transmission pin 28 matched with the transmission hole 30, and the spring 26 is sleeved outside the transmission shaft 24 below the transmission rod and the mounting rod 25. The spring 26 pushes the scraping plate 27 to be in contact with the crude filter screen 29 by the elastic force of the spring 26. When the crude stirring motor 5 drives the crude stirrer 8 to rotate, the transmission gear 23 engages with the partial gear 22 to drive the scraping plate 27 to move intermittently, so as to intermittently clean the crude filter screen 29.

[0031] As shown in Figure 1 and Figure 8The bottom of the refining reactor 4 is provided with a mounting block 41 and a transmission cavity 42, the lower end of the refining stirring shaft 43 is in transmission connection with the refining stirring motor 16 mounted at the bottom of the transmission cavity 42 through the transmission cavity 42, the inside of the mounting block 41 and the transmission cavity 42 is provided with a timing mechanism 20, the timing mechanism 20 controls the stirring reaction time of the refining reactor 4.

[0032] Specifically, referring to Figure 8 、 Figure 9 and Figure 10 , the timing mechanism 20 comprises a partial bevel gear 44, a bevel gear 45, a timing sliding block 46, a conductive contact piece one 47, a timing sliding cavity 48, a timing sliding slot 49, a transmission screw rod 50 and a conductive contact piece two 51, the partial bevel gear 44 is mounted on the refining stirring shaft 43 in the transmission cavity 42, the timing sliding block 46 is mounted in the timing sliding cavity 48, the timing sliding slot 49 is arranged on the upper and lower sides of the timing sliding cavity 48, the upper and lower sides of the timing sliding block 46 are provided with sliding ears 54 matched with the timing sliding slot 49, one conductive contact piece one 47 is arranged on each of the upper and lower sliding ears 54, the two conductive contact piece ones 47 are in communication through wires, the middle of the timing sliding block 46 is provided with a threaded hole 53 threadedly matched with the transmission screw rod 50, the middle section of the transmission screw rod 50 is provided with threads, the two ends are mounted on the mounting block 41 through bearings, the timing sliding cavity 48 is arranged in the inside of the mounting block 41, one end of the transmission screw rod 50 extends out of the outside of the mounting block 41, the other end extends into the transmission cavity 42, the bevel gear 45 is mounted on the end of the end of the transmission screw rod 50 extending into the transmission cavity 42, and the bevel gear 45 is engaged with the partial bevel gear 44, only part of the positions on the circumference of the partial bevel gear 44 are provided with bevel gears 55, the bevel gear 45 and the partial bevel gear 44 are engaged to serve as a delay action (the number of teeth of the bevel gear 45 is much larger than the number of teeth on the partial bevel gear 44), and the transmission screw rod 50 is further threadedly matched with the timing sliding block 46 to further delay and amplify, so as to achieve a long-time timing action, so that the position of the timing sliding block 46 in the timing sliding cavity 48 can be adjusted by controlling the rotating speed of the refining stirring motor 16, and accurate timing can be achieved; the conductive contact piece two 51 is arranged on one end of the timing sliding slot 49 close to the transmission cavity 42, the two conductive contact piece twos 51 are connected in series in a control circuit, the partial bevel gear 44 and the bevel gear 45 are engaged in transmission to drive the transmission screw rod 50 to rotate, the timing sliding block 46 is threadedly matched with the transmission screw rod 50 to move the timing sliding block 46 in the timing sliding cavity 48, when the conductive contact piece one 47 contacts with the conductive contact piece two 51, the control circuit is connected, and an electrical signal is transmitted to the controller, after the controller receives the electrical signal, the circuit of the refining stirring motor 16 is controlled to be disconnected, the stirring reaction timing control is realized, and the controller can be selected as PLC, and the controller and other system parts are existing mature technologies, and the related description thereof is omitted here.

[0033] Further, as Figure 8As shown, the end of the transmission screw 50 extending out of the mounting block 41 is provided with a hexagonal slot 52, a hexagonal head wrench can be inserted into the hexagonal slot 52 to rotate the transmission screw 50, so that the timing slider 46 is reset or preset to a position, ensuring that the finishing mixer 16 rotates at a constant speed, that is, ensuring timing, and when rotating, the bevel gear 44 is quickly separated from the bevel gear 45, so that the finishing mixer 15 does not rotate with the bevel gear 44.

[0034] Further, the finishing reactor 4 is provided with a scraping mechanism with the same or similar structure as the crude reactor 1, and the scraping mechanism is installed on the finishing stirring shaft 43. The shape and structure of the scraping plate can be adjusted according to the position of the finishing liquid outlet 17. The specific structure of the scraping mechanism in the finishing reactor 4 is omitted in the drawing.

[0035] Further, the crude reactor 1, the auxiliary tank 2, the mixing tank 3 and the finishing reactor 4 are each provided with a mounting seat 9, and are fixed on a mounting frame through the mounting seat 9 and a bolt structure. The structure of the mounting frame is omitted in the drawing.

[0036] Further, the finishing reactor 4 and the crude reactor 1 are each provided with a heating jacket 21, and heating steam or hot water and the like are introduced into the heating jacket 21 to heat and keep warm the finishing reactor 4 and the crude reactor 1.

[0037] Working principle: first, the raw materials are added to the crude reactor 1, the solid raw material zinc oxide is added from the solid inlet 6, and the liquid raw material sulfuric acid is added from the liquid inlet 7, then the crude stirrer 8 is driven by the crude stirring motor 5 to stir and react the raw materials to obtain a crude zinc sulfate solution, the solid impurities not participating in the reaction are discharged through the crude impurity outlet, and the crude zinc sulfate solution is pumped into the mixing tank 3 through the crude liquid outlet 11 and the feeding pump 13. During the pumping process, the zinc sulfate solution pushes open the sealing block 32 (the greater the flow, the greater the opening degree), and at the same time, the sealing sliding block 35 is moved by the connecting rod 33 to open the sealing sliding groove 37 (the valve between the auxiliary tank 2 and the mixing tank 3 is opened in advance), and the opening degree (the length of the sealing sliding groove) is proportional to the flow of the zinc sulfate solution, and the auxiliary materials (a mixed solution of thiram and thiourea) flow into the mixing tank 3 from the opening position of the sealing sliding groove 37 for mixing, and then enter the finishing reactor 4 for reaction. The finishing reactor 4 is timed by the timing mechanism (the timing accuracy is ensured by ensuring that the finishing stirring motor 16 rotates at a constant speed), heated and stirred for a preset time, the timing mechanism triggers to disconnect the finishing stirring motor 16 circuit, completes the stirring reaction, and the filtered zinc sulfate solution obtained from the finishing liquid outlet 17 is a finished solution, and the filtered impurities are discharged from the finishing impurity outlet. It should be noted that the feeding proportion accuracy and timing accuracy of the present application can fully meet the production process of zinc sulfate.

[0038] The embodiments are only used for explaining the present application, and are not used for limiting the present application, and the person skilled in the art can make the modification of the embodiments without the creative contribution according to the need after reading the description, and as long as the modification is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A zinc sulfate impurity removal device, comprising a crude reactor (1), an auxiliary material tank (2), a mixing tank (3) and a refined reactor (4), a crude stirrer (8) is installed in the crude reactor (1), the crude stirrer (8) is drivingly connected with a crude stirring motor (5) at the top of the crude reactor (1), a solid feeding port (6) and a liquid feeding port (7) are arranged at the top of the crude reactor (1), a crude impurity outlet (10) and a crude liquid outlet (11) are arranged at the bottom of the crude reactor (1), a crude filter screen (29) is arranged at the outlet position of the crude liquid outlet (11), the crude liquid outlet (11) is connected with the mixing tank (3) through a feeding pipe (12), a feeding pump (13) is installed on the feeding pipe (12), the auxiliary material tank (2) is installed above the mixing tank (3), the mixing tank (3) is installed at the top of the refined reactor (4), a refined stirrer (15) is installed in the refined reactor (4), the refined stirrer (15) is drivingly connected with a refined stirring motor (16) installed at the bottom of the refined reactor (4), a refined liquid outlet (17) and a refined impurity outlet (19) are installed at the bottom of the refined reactor (4), a refined filter screen (18) is installed at the outlet position of the refined liquid outlet (17), characterized in that: The mixing tank (3) is provided with a feeding mechanism (14), which comprises a conical feeding port (31), a sealing block (32), a connecting rod (33), a feeding cover (34), a sealing sliding block (35), a positioning baffle (36), a sealing sliding groove (37) and a sealing spring (38). The feeding cover (34) is arranged at the top of the mixing tank (3), and the upper end of the feeding cover (34) is connected with the auxiliary tank (2) through an auxiliary inlet (39). The bottom of the feeding cover (34) is communicated with the inner cavity of the mixing tank (3) through the sealing sliding groove (37). The sealing sliding groove (37) is provided with a "T"-shaped sealing sliding block (35). The positioning baffle (36) is arranged above one side of the sealing sliding groove (37). The two ends of the positioning baffle (36) are fixedly connected with the feeding cover (34). One end of the sealing sliding block (35) is inserted into the lower part of the positioning baffle (36). The sealing spring (38) is arranged between the positioning baffle (36) and the sealing sliding groove (37). The two ends of the sealing spring (38) are respectively inserted into the mounting holes of the sealing sliding block (35) and the feeding cover (34). The contact surfaces of the positioning baffle (36), the sealing sliding groove (37), the feeding cover (34) and the positioning baffle (36) are sealingly arranged through a sealing structure. The bottom of the sealing sliding block (35) is fixedly connected with one end of an "L"-shaped connecting rod (33). The other end of the connecting rod (33) is connected with the sealing block (32). The sealing block (32) extends into the conical feeding port (31). The feeding pipe (12) is connected with the mixing tank (3) through the conical feeding port (31). When the sealing spring (38) pushes the sealing sliding block (35) to the end of the sealing sliding groove (37) and completely separates the inner cavity of the feeding cover (34) from the mixing tank (3), the sealing block (32) is sealingly attached to the inner wall of the conical feeding port (31). The feeding pump pumps the crude zinc sulfate solution to move the sealing block (32). The movement of the sealing block (32) drives the movement of the sealing sliding block (35) and the compression of the sealing spring (38), so that the sealing sliding groove (37) is partially opened. The liquid amount passing through the gap between the conical feeding port (31) and the sealing block (32) per unit time is proportional to the opening length of the sealing sliding groove (37). The inner cavity of the crude reaction kettle (1) is provided with a scraping mechanism. The bottom of the refined reaction kettle (4) is provided with a mounting block (41) and a transmission cavity (42). The lower end of the refined stirring shaft (43) penetrates through the transmission cavity (42) and is drivingly connected with the refined stirring motor (16) arranged at the bottom of the transmission cavity (42). The inside of the mounting block (41) and the transmission cavity (42) is provided with a timing mechanism (20). The timing mechanism (20) controls the stirring reaction time of the refined reaction kettle (4).

2. The zinc sulfate impurity removal device of claim 1, wherein: The timing mechanism (20) comprises a partial bevel gear (44), a bevel gear (45), a timing slider (46), a conductive tab (47), a timing sliding cavity (48), a timing sliding slot (49), a transmission screw rod (50) and a conductive tab (51), the partial bevel gear (44) is installed on the refined stirring shaft (43) in the transmission cavity (42), the timing slider (46) is installed in the timing sliding cavity (48), the timing sliding slot (49) is arranged on the upper and lower sides of the timing sliding cavity (48), the upper and lower sides of the timing slider (46) are provided with sliding ears (54) matched with the timing sliding slot (49), one conductive tab (47) is arranged on each of the upper and lower sliding ears (54), the two conductive tabs (47) are communicated through a wire, the middle of the timing slider (46) is provided with a threaded hole (53) threadedly matched with the transmission screw rod (50), the middle section of the transmission screw rod (50) is provided with a thread, and the two ends are installed on the mounting block (41) through bearings, the timing sliding cavity (48) is arranged inside the mounting block (41), one end of the transmission screw rod (50) extends out of the mounting block (41), and the other end extends into the transmission cavity (42), the bevel gear (45) is installed on the end of the end of the transmission screw rod (50) extending into the transmission cavity (42), and the bevel gear (45) is engaged with the partial bevel gear (44); one end of the timing sliding slot (49) close to the transmission cavity (42) is provided with a conductive tab (51), and the two conductive tabs (51) are connected in series in a control circuit, the partial bevel gear (44) is engaged with the bevel gear (45) to drive the transmission screw rod (50) to rotate, the timing slider (46) is threadedly matched with the transmission screw rod (50), so that the timing slider (46) moves in the timing sliding cavity (48), when the conductive tab (47) contacts the conductive tab (51), the control circuit is turned on, and an electrical signal is transmitted to the controller, after the controller receives the electrical signal, the refined stirring motor (16) circuit is controlled to be turned off, and the stirring reaction timing control is realized.

3. The zinc sulfate impurity removal device of claim 2, wherein: The scraping mechanism comprises a partial gear (22), a transmission gear (23), a transmission shaft (24), a mounting rod (25), a spring (26), a scraping plate (27) and a transmission bolt (28), the partial gear (22) is installed at the bottom of the crude stirrer (8), the transmission shaft (24) is installed on the mounting rod (25) through bearings, the mounting rod (25) is fixedly installed on the inner side wall of the crude reactor (1), the transmission gear (23) is installed at the top of the transmission shaft (24) and engaged with the partial gear (22), the bottom of the transmission shaft (24) is provided with a transmission insertion hole (30), the upper end of the scraping plate (27) is provided with a transmission rod with the same diameter as the transmission shaft (24), the upper end of the transmission rod is provided with a transmission bolt (28) matched with the transmission insertion hole (30), the spring (26) is sleeved outside the transmission shaft (24) below the transmission rod and the mounting rod (25), and the scraping plate (27) is pushed to be attached to the crude filter screen (29) through the elastic force of the spring (26).

4. The zinc sulfate impurity removal device of claim 3, wherein: The end of the transmission screw rod (50) extending out of the mounting block (41) is provided with a hexagonal slot (52).

5. A zinc sulfate polishing apparatus as claimed in claim 4, wherein: The refining reaction kettle (4) is provided with a scraping mechanism with the same structure as that in the crude reaction kettle (1), and the scraping mechanism is installed on the refining stirring shaft (43).

6. The zinc sulfate impurity removal device of claim 1, wherein: The crude reaction kettle (1), the auxiliary material tank (2), the mixing tank (3) and the refining reaction kettle (4) are all provided with mounting seats (9), and are fixed on the mounting frame through the mounting seats (9).

7. The zinc sulfate impurity removal device of claim 1, wherein: The refining reaction kettle (4) and the crude reaction kettle (1) are both provided with heating jackets (21).

8. The zinc sulfate polishing apparatus of claim 1, wherein: The sealing rubber layer is arranged on the surface of the sealing sliding block (35) in contact with the upper end of the two sides of the sealing sliding groove (37), and the sealing strip (40) is arranged on the inner wall of the positioning baffle (36) and the feeding cover (34) to seal the sealing sliding block (35).

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