Mechanical stirring auxiliary mechanism, galvanized steel sheet zinc recovery system and method

Abstract

The present invention relates to the field of zinc recovery technology, and in particular to a mechanical stirring auxiliary mechanism, a galvanized steel plate zinc recovery system and method. The mechanical stirring auxiliary mechanism comprises a stirring container, an isolation ring, a drainage pipe, a control sleeve and a power pump. The drainage pipe is arranged outside the isolation ring and extends along the circumference of the isolation ring. A gap is left between the two ends of the drainage pipe, and one end of the drainage pipe is a closed structure. The drainage pipe is provided with a notch, which is located on the side close to the isolation ring. The notch runs from the outer wall to the inner space, and the notch extends along the length direction. The control sleeve can be slidably sleeved on the drainage pipe, and the inner wall of the control sleeve fits the outer wall of the drainage pipe. The control sleeve is driven by a first driver, and the control sleeve can reciprocate between the two ends of the drainage pipe. The power pump is arranged inside the drainage pipe and at the mouth of the drainage pipe, so as to transport the liquid inside the drainage pipe outward. It has positive significance for improving the efficiency and adequacy of zinc recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of zinc recovery, and in particular to a mechanical stirring auxiliary mechanism, a galvanized steel plate zinc recovery system and a method. Background Art

[0002] In the process of recycling zinc on galvanized steel sheets, auxiliary stirring tools are needed to promote the full release of zinc. However, in the actual production operation process, due to the high hardness of galvanized steel sheets and the difficulty of crushing, when recycling zinc, galvanized steel sheets are often in the form of plates and large blocks, which makes it difficult to use traditional stirring tools that use stirring blades (the stirring blades are easily damaged when they collide with the galvanized steel sheets). Therefore, in the actual recycling process, insufficient stirring, insufficient zinc release or slow release are likely to occur, which is not conducive to improving production efficiency and fully recycling zinc.

[0003] In view of this, this application is hereby filed. Summary of the invention

[0004] The first object of the present invention is to provide a mechanical stirring auxiliary mechanism, which is suitable for auxiliary stirring of a mixed phase of a solid material with a large volume and a heavy weight and a solution, overcoming the problem that traditional stirring tools cannot effectively perform stirring tasks. The auxiliary stirring that can be applied to zinc recovery has positive significance for improving the efficiency and adequacy of zinc recovery.

[0005] The second object of the present invention is to provide a galvanized steel plate zinc recovery system, which can effectively exert the stirring effect during the recovery process, overcome the problem that traditional stirring tools cannot effectively perform stirring tasks, and has positive significance for improving the efficiency and adequacy of zinc recovery.

[0006] The third object of the present invention is to provide a method for recovering zinc from galvanized steel sheets, which is simple and efficient, has a simple process, is low in cost, and is environmentally friendly.

[0007] The embodiment of the present invention is achieved as follows:

[0008] A mechanical stirring auxiliary mechanism comprises: a stirring container, an isolation ring, a drainage pipe, a control sleeve and a power pump.

[0009] The isolating ring is arranged on the inner bottom wall of the stirring container, and the central axis of the isolating ring is arranged along the height direction of the stirring container. The side wall of the isolating ring is provided with a liquid hole penetrating the isolating ring.

[0010] The drainage tube is arranged outside the isolation ring and extends along the circumference of the isolation ring, a gap is left between the two ends of the drainage tube, and one end of the drainage tube is a closed structure. The drainage tube is provided with a notch, the notch is located on the side close to the isolation ring, the notch penetrates from the outer wall to the internal space, and the notch extends along the length direction.

[0011] The control sleeve is slidably sleeved on the drainage tube, and the inner wall of the control sleeve is in contact with the outer wall of the drainage tube. The control sleeve is driven by the first driver so that the control sleeve can reciprocate between the two ends of the drainage tube.

[0012] The power pump is arranged inside the drainage tube and located at the mouth of the drainage tube, so as to transport the liquid inside the drainage tube to the outside.

[0013] Furthermore, the outer wall of the open end of the drainage tube has a first annular flange, and the outer wall of the closed end of the drainage tube has a second annular flange. The first annular flange and the second annular flange are coaxially arranged and spaced apart.

[0014] The mechanical stirring auxiliary mechanism also includes: a guide member. The guide member is in a semicircular ring shape and is fitted between the first annular flange and the second annular flange. The cylindrical surface corresponding to the guide member is coaxially arranged with the first annular flange and the second annular flange. Along the circumference of the first annular flange and the second annular flange, the guide member can be slidably fitted between the first annular flange and the second annular flange, and the guide member is driven by the second driver.

[0015] Furthermore, the mechanical stirring auxiliary mechanism further comprises: a sampling tube. The sampling tube comprises: an outer tube body, a sliding member, a telescopic inner liner, a first driving column and a second driving column.

[0016] The sliding member is slidably fitted in the outer tube body.

[0017] The telescopic liner is arranged in the outer tube body, the bottom of the telescopic liner is fixedly connected to the sliding member, the mouth of the telescopic liner is coaxially arranged with the mouth of the outer tube body, and the periphery of the mouth of the telescopic liner is attached to and fixedly connected with the periphery of the mouth of the outer tube body.

[0018] The first driving column extends through the mouth of the outer tube into the telescopic inner liner and is fixedly connected to the bottom of the telescopic inner liner, and the second driving column is fixedly connected to the end of the first driving column away from the sliding member. The outer diameter of the second driving column is larger than the outer diameter of the first driving column, and the outer diameter of the second driving column is adapted to the inner diameter of the mouth of the outer tube. When the sliding member moves to the bottom end of the outer tube, the second driving column is just interference fit with the mouth of the outer tube.

[0019] In the initial state, the sliding member is located at the mouth of the outer tube body, and the telescopic liner is compressed.

[0020] The guide piece is provided with a receiving hole, which is arranged along the axis center line direction of the cylindrical surface corresponding to the guide piece. The outer tube body of the sampling tube is detachably received in the receiving hole.

[0021] The control sleeve is provided with a pusher. When the control sleeve moves to the end of the drainage tube, the pusher can push the second drive column toward the inside of the outer tube body so that the second drive column and the mouth of the outer tube body have an interference fit, thereby completing sample collection.

[0022] Furthermore, along the arc-shaped extending direction of the flow guide member, a plurality of accommodating holes are sequentially arranged at intervals.

[0023] The mechanical stirring auxiliary mechanism further includes: a controller. The first driver and the second driver are both electrically connected to the controller.

[0024] The first driver is used to drive the control sleeve to continuously reciprocate along the drainage tube. The second driver is used to drive the flow guide member to rotate at a constant speed in a clockwise direction or a counterclockwise direction.

[0025] The controller is used to control the first driver and the second driver so that after the control sleeve completes n reciprocating motions, when the control sleeve reaches the end where the guide member is located, the pusher can align with the second drive column of a sampling tube located on the guide member and push the second drive column to enable the corresponding sampling tube to complete sample collection.

[0026] A galvanized steel sheet zinc recovery system comprises the above-mentioned mechanical stirring auxiliary mechanism.

[0027] A method for recovering zinc from a galvanized steel sheet comprises the following steps:

[0028] S1. Place the galvanized steel sheet to be recycled into the stirring container of the above-mentioned mechanical stirring auxiliary mechanism, and place the galvanized steel sheet to be recycled within the isolation ring.

[0029] S2. Add an alkaline solution with a concentration of 1 to 8 mol / L into a stirring container, wherein the temperature of the alkaline solution is 10 to 100°C.

[0030] S3. Arrange an iron cathode for the galvanic cell reaction in a stirring container.

[0031] S4. Turn on the mechanical stirring auxiliary mechanism and soak for 10 to 90 minutes.

[0032] Furthermore, the alkaline solution is any one of NaOH solution, KOH solution and ammonia solution.

[0033] Furthermore, the mass ratio of the alkaline solution to the galvanized steel sheet to be recycled is (3-15):1.

[0034] Furthermore, the side length of the galvanized steel sheet to be recycled is less than or equal to 50 cm.

[0035] The beneficial effects of the technical solution of the embodiment of the present invention include:

[0036] During the stirring process of the mechanical stirring auxiliary mechanism provided in the embodiment of the present invention, the power pump works and the liquid in the drainage tube is continuously discharged from its open end (mouth). Therefore, the liquid in the stirring container continuously enters the drainage tube from the gap.

[0037] Under the action of the first driver, the control sleeve reciprocates along the drainage tube, and the position of the gap blocked by the control sleeve lock changes continuously, which makes the liquid inlet position on the gap change continuously, thereby effectively playing an auxiliary mixing role. At the same time, since the liquid inlet position of the gap changes continuously, it can effectively promote the mixing of liquid phases in various directions.

[0038] In addition, the flow force at the open end of the drainage tube and the reciprocating motion of the control sleeve can further agitate the liquid phase, thereby further improving the stirring effect.

[0039] In general, the mechanical stirring auxiliary mechanism provided by the embodiment of the present invention is suitable for auxiliary stirring of a mixed phase of a solid material with a large volume and a heavy weight and a solution, overcoming the problem that traditional stirring tools cannot effectively perform stirring tasks. The auxiliary stirring that can be applied to zinc recovery has positive significance for improving the efficiency and adequacy of zinc recovery.

[0040] The galvanized steel plate zinc recovery system provided by the embodiment of the present invention can effectively exert the stirring effect during the recovery process, overcoming the problem that traditional stirring tools cannot effectively perform the stirring task, and has positive significance for improving the efficiency and adequacy of zinc recovery.

[0041] The method for recovering zinc from a galvanized steel sheet provided by the embodiment of the present invention is simple and efficient, has a simple process, is low in cost, and is environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic diagram of the overall structure of a mechanical stirring auxiliary mechanism provided in an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the external coordination of the drainage pipe of the mechanical stirring auxiliary mechanism provided in an embodiment of the present invention;

[0045] Figure 3 for Figure 2 A schematic diagram of the structure of the opening end of the middle drainage tube;

[0046] Figure 4 This is a schematic diagram of the matching of the drainage pipe (when the guide piece is removed);

[0047] Figure 5 for Figure 4 A schematic diagram of the structure of the opening end of the middle drainage tube;

[0048] Figure 6 It is a schematic diagram of the internal coordination of the drainage tube;

[0049] Figure 7 for Figure 6 A schematic diagram of the structure of the opening end of the middle drainage tube;

[0050] Figure 8 is a schematic diagram of the structure of the guide member;

[0051] Fig. 9 This is a schematic diagram of the structure of the sampling tube (in the initial state);

[0052] Fig.10 Schematic diagram of the structure of the sampling tube (after sampling is completed).

[0053] Description of reference numerals:

[0054] Stirring container 100; isolation ring 200; drainage tube 300; notch 310; first annular flange 320; second annular flange 330; control sleeve 400; pusher 410; power pump 500; flow guide 600; accommodating hole 610; sampling tube 700; outer tube body 710; sliding member 720; telescopic liner 730; first driving column 740; second driving column 750. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0059] In addition, the terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0060] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Please refer to Figure 1 to Figure 7 This embodiment provides a mechanical stirring auxiliary mechanism, which includes: a stirring container 100, an isolation ring 200, a drainage tube 300, a control sleeve 400 and a power pump 500.

[0062] The isolation ring 200 is arranged on the inner bottom wall of the stirring container 100, and the central axis of the isolation ring 200 is arranged along the height direction of the stirring container 100. In this embodiment, the central axis of the isolation ring 200 is arranged to coincide with the central axis of the stirring container 100. A liquid hole is provided on the side wall of the isolation ring 200 to penetrate the isolation ring 200. Optionally, the isolation ring 200 can also be directly made of a mesh plate or a porous plate.

[0063] The drainage tube 300 is arranged outside the isolation ring 200 and extends along the circumference of the isolation ring 200. A gap is left between the two ends of the drainage tube 300, that is, the overall shape of the drainage tube 300 is an open ring. One end of the drainage tube 300 is a closed structure, that is, one end of the drainage tube 300 has an opening (an open end) and the other end is closed (a closed end).

[0064] The drainage tube 300 is provided with a notch 310, which is located on a side thereof close to the isolation ring 200. The notch 310 penetrates from the outer wall of the drainage tube 300 to the inner space thereof, and the notch 310 is extended along the length direction of the drainage tube 300. In this embodiment, the notch 310 extends to both ends of the drainage tube 300, and there is a gap between the notch 310 and the end surface of the closed end of the drainage tube 300, and there is also a gap between the notch 310 and the mouth of the open end of the drainage tube 300.

[0065] The control sleeve 400 is slidably mounted on the drainage tube 300, the inner wall of the control sleeve 400 is in contact with the outer wall of the drainage tube 300, and a sliding seal is formed between the control sleeve 400 and the drainage tube 300. The control sleeve 400 is driven by a first driver (not shown in the figure) so that the control sleeve 400 can reciprocate between the two ends of the drainage tube 300.

[0066] The power pump 500 is disposed inside the drainage tube 300 and located at the mouth of the drainage tube 300 to transport the liquid inside the drainage tube 300 to the outside.

[0067] Optionally, a plurality of drainage tubes 300 are evenly spaced and arranged along the height direction of the isolation ring 200 , and correspondingly, each drainage tube 300 is provided with a control sleeve 400 , a power pump 500 , etc.

[0068] During the stirring process, the power pump 500 works, and the liquid in the drainage tube 300 is continuously discharged from its open end (mouth). Therefore, the liquid in the stirring container 100 continuously enters the drainage tube 300 from the notch 310 .

[0069] Under the action of the first driver, the control sleeve 400 reciprocates along the drainage tube 300, and the position of the notch 310 blocked by the control sleeve 400 changes continuously, which makes the liquid inlet position on the notch 310 change continuously, thereby effectively playing an auxiliary mixing role. At the same time, since the liquid inlet position of the notch 310 changes continuously, it can effectively promote the mixing of liquid phases in various directions.

[0070] In addition, the flow force at the open end of the drainage tube 300 and the reciprocating motion of the control sleeve 400 can further stir the liquid phase, thereby further improving the stirring effect.

[0071] In this embodiment, please combine Figure 1 to Figure 8 The outer wall of the open end of the drainage tube 300 has a first annular flange 320, and the outer wall of the closed end of the drainage tube 300 has a second annular flange 330. The first annular flange 320 and the second annular flange 330 are coaxially arranged and spaced apart.

[0072] The mechanical stirring auxiliary mechanism also includes: a guide member 600. The guide member 600 is in a semicircular shape and is fitted between the first annular flange 320 and the second annular flange 330. The cylindrical surface corresponding to the guide member 600 is coaxially arranged with the first annular flange 320 and the second annular flange 330. Along the circumference of the first annular flange 320 and the second annular flange 330, the guide member 600 can be slidably fitted between the first annular flange 320 and the second annular flange 330, and the guide member 600 is driven by a second driver (not shown in the figure) to move the guide member 600 along the circumference of the first annular flange 320 and the second annular flange 330.

[0073] Through this design, the guide member 600 can guide the liquid output from the mouth of the drainage tube 300, promote the liquid to flow to the side away from the guide member 600, thereby improving the controllability of the liquid at the outlet end of the drainage tube 300, and can flexibly change the flow direction of the liquid at the outlet end of the drainage tube 300 according to actual conditions and stirring needs, thereby further optimizing the stirring and mixing effect.

[0074] Further, please combine Figure 1 to Figure 10 The mechanical stirring auxiliary mechanism further includes: a sampling tube 700. The sampling tube 700 includes: an outer tube body 710, a sliding member 720, a telescopic inner liner 730, a first driving column 740 and a second driving column 750.

[0075] The outer tube 710 has a closed end and an opening at the other end.

[0076] The sliding member 720 is slidably fitted in the outer tube 710. Along the axial direction of the outer tube 710, the sliding member 720 is slidably fitted in the outer tube 710.

[0077] The telescopic liner 730 is arranged in the outer tube body 710, and the telescopic direction of the telescopic liner 730 is the axial direction of the outer tube body 710. The bottom of the telescopic liner 730 is fixedly connected to the sliding member 720, the mouth of the telescopic liner 730 is coaxially arranged with the mouth of the outer tube body 710, and the periphery of the mouth of the telescopic liner 730 is attached to and fixedly connected with the periphery of the mouth of the outer tube body 710.

[0078] The first driving column 740 extends through the mouth of the outer tube 710 into the telescopic inner liner 730 and is fixedly connected to the bottom of the telescopic inner liner 730. The outer diameter of the first driving column 740 is smaller than the inner diameter of the mouth of the outer tube 710. The second driving column 750 is fixedly connected to the end of the first driving column 740 away from the sliding member 720. The outer diameter of the second driving column 750 is larger than the outer diameter of the first driving column 740, and the outer diameter of the second driving column 750 is adapted to the inner diameter of the mouth of the outer tube 710. When the sliding member 720 moves to the bottom end of the outer tube 710, the second driving column 750 is just interference fit with the mouth of the outer tube 710.

[0079] The first driving column 740 , the second driving column 750 and the outer tube 710 are coaxially arranged.

[0080] In the initial state, the sliding member 720 is located at the mouth of the outer tube 710, and the telescopic inner liner 730 is compressed.

[0081] The guide member 600 is provided with a receiving hole 610, which is arranged along the axis direction of the cylindrical surface corresponding to the guide member 600. The outer tube body 710 of the sampling tube 700 is detachably received in the receiving hole 610. In this embodiment, the receiving hole 610 is provided on a side of the guide member 600 away from the first annular flange 320. When the sampling tube 700 is received in the receiving hole 610, the second driving column 750 extends out of the receiving hole 610.

[0082] The control sleeve 400 is provided with a pushing member 410 (optionally a pushing block). When the control sleeve 400 moves to the end of the closed end of the drainage tube 300, the pushing member 410 can push the second driving column 750 toward the inside of the outer tube body 710 so that the second driving column 750 is interference fit with the mouth of the outer tube body 710, thereby completing sample collection.

[0083] When the pusher 410 pushes the second drive column 750 toward the inside of the outer tube 710, the slide 720 drives the telescopic liner 730 to expand, thereby "sucking" the liquid into the telescopic liner 730. When the slide 720 moves to the bottom of the outer tube 710, the second drive column 750 just moves to the mouth of the outer tube 710 and has an interference fit with the mouth of the outer tube 710, thereby sealing the outer tube 710, and the liquid sample is sealed in the outer tube 710.

[0084] Optionally, the sliding member 720 can also be set as a piston. In this case, the sliding member 720 and the outer tube body 710 are slidably sealed. Accordingly, the telescopic inner liner 730 can be made of a filter screen, and the originally closed end of the outer tube body 710 can also be set to an open structure (i.e., no longer closed). After the sampling is completed, after the sampling tube 700 is removed from the guide member 600, the sliding member 720 can be slid out from the end of the outer tube body 710 away from the second drive column 750 (this end is no longer closed). In this way, the sample liquid can be poured out from this end. At this time, the sample liquid has been filtered by the telescopic inner liner 730, and solid impurities that may be mixed therein can be filtered out.

[0085] Furthermore, along the arc-shaped extension direction of the flow guide 600, a plurality of accommodating holes 610 are sequentially arranged at intervals, and each accommodating hole 610 accommodates a sampling tube 700. Figure 8 shown.

[0086] The mechanical stirring auxiliary mechanism further includes: a controller (not shown in the figure). The first driver and the second driver are both electrically connected to the controller.

[0087] The first driver is used to drive the control sleeve 400 to continuously reciprocate along the drainage tube 300. The second driver is used to drive the guide member 600 to rotate at a uniform speed in a clockwise direction or a counterclockwise direction, that is, the second driver is used to drive the guide member 600 to rotate in one direction.

[0088] The controller is used to control the first driver and the second driver so that after the control sleeve 400 completes n (n is a positive integer greater than or equal to 1, and its specific value can be flexibly set according to actual needs) reciprocating motions, when the control sleeve 400 reaches the end where the second annular flange 330 is located, the pusher 410 can align with the second drive column 750 of a sampling tube 700 located on the guide member 600 and push the second drive column 750, so that the corresponding sampling tube 700 completes sample collection.

[0089] When the control sleeve 400 completes n reciprocating motions for the next time, when the control sleeve 400 reaches the end where the second annular flange 330 is located, the pushing member 410 can just align with the second driving column 750 of another sampling tube 700 (a sampling tube 700 adjacent to the previous sampling tube 700) and push the second driving column 750, thereby completing the sample collection of the other sampling tube 700.

[0090] By repeating this process, the sample collection of each sampling tube 700 can be completed intermittently one by one during the stirring process, thereby collecting liquid samples with different stirring times, which facilitates the technicians to conduct a comprehensive analysis of the relevant process.

[0091] In general, the mechanical stirring auxiliary mechanism provided in this embodiment is suitable for auxiliary stirring of a mixed phase of a solid material with a large volume and a heavy weight and a solution, overcoming the problem that traditional stirring tools cannot effectively perform stirring tasks. It can be applied to auxiliary stirring of zinc recovery, which has positive significance for improving the efficiency and adequacy of zinc recovery.

[0092] This embodiment also provides a galvanized steel sheet zinc recovery system, which includes the above-mentioned mechanical stirring auxiliary mechanism.

[0093] This embodiment also provides a method for recovering zinc from a galvanized steel sheet, which comprises the following steps:

[0094] S1. Place the galvanized steel sheet to be recycled into the stirring container 100 of the mechanical stirring auxiliary mechanism, and place the galvanized steel sheet to be recycled within the isolation ring 200.

[0095] S2. Add an alkaline solution with a concentration of 1 to 8 mol / L into the stirring container 100. The temperature of the alkaline solution is 10 to 100°C.

[0096] S3. Arrange an iron cathode for the galvanic cell reaction in the stirring container 100.

[0097] S4, start the mechanical stirring auxiliary mechanism, so that the first driver, the second driver, and the power pump 500 of the mechanical stirring auxiliary mechanism all work according to the preset mode. Soak for 10 to 90 minutes under the auxiliary stirring action of the mechanical stirring auxiliary mechanism.

[0098] Optionally, the alkaline solution is any one of NaOH solution, KOH solution and ammonia water.

[0099] Optionally, the mass ratio of the alkaline solution to the galvanized steel sheet to be recycled is (3-15):1.

[0100] Optionally, the side length of the galvanized steel sheet to be recycled is less than or equal to 50 cm.

[0101] The zinc recovery method of the galvanized steel sheet is particularly suitable for the case where the surface coating is: a galvanized layer, a ZnLi alloy or a ZnMg alloy.

[0102] Through the above steps, the leaching rate of zinc on the galvanized steel sheet to be recycled can reach 99.995%~99.998%.

[0103] After the immersion is completed, the zinc on the galvanized steel sheet to be recovered fully enters the solution, and the dezincified steel sheet can be returned to the smelting furnace for smelting after cleaning and drying. The zinc-containing alkaline leaching solution can be purified through subsequent processes to obtain metallic zinc powder.

[0104] Exemplarily, after soaking, the zinc-containing solution is filtered to remove impurities, a separating agent is added to the filtrate, and the mixture is stirred for 30 to 200 minutes at a constant temperature of 10 to 100°C, then allowed to stand for 1 to 4 hours and filtered to separate the precipitate containing impurities. The resulting zinc-containing filtrate is put into an aging kettle for aging. Subsequently, the filtrate aged for 1 to 3 days is directly sent to an electrolytic cell for electrolysis, and a metallic zinc powder with a purity of 99.00% to 99.95% is deposited on the cathode. After the electrolysis is completed, the electrolytic solution is returned and circulated in the next alkaline leaching process. This is only an example of purifying zinc from a solution, and is not limited thereto. During the specific implementation process, the purification method can also be flexibly adjusted according to actual needs.

[0105] During the zinc recovery process, the mechanical stirring auxiliary mechanism can not only effectively assist in stirring, but also collect liquid samples at different times during the immersion process. This makes it convenient for technicians to reanalyze the zinc concentration at different time points during the zinc recovery process after completion, thereby helping technicians to improve and optimize the recovery process, which is of positive significance for improving the efficiency and adequacy of zinc recovery.

[0106] Among the traditional recycling processes, there are acid dissolution, mechanical removal and reprocessing, vacuum baking and the like.

[0107] The acid dissolution method has a complex production process and high cost. If it is not properly controlled, it will also cause damage to the galvanized sheet substrate. The subsequent process is complicated and the environmental pollution is serious.

[0108] Mechanical removal and reprocessing method, this method mostly uses shot peening technology, and its theoretical basis is: at 495℃, zinc and iron can form brittle interphase compounds, so zinc and iron can be separated by mechanical methods. Experimental results show that 23% of zinc can be removed by baking at 550℃ alone, and 30% of zinc can be removed by shot peening at room temperature. If the two are combined, 67% of zinc can be removed by shot peening for 2 minutes after baking at 550℃; 87% of zinc can be removed by shot peening for 5 minutes after baking at 550℃. It can be seen that shot peening directly affects the zinc removal effect. The suitable temperature is 495-550℃. The removed zinc is sent to the regeneration zinc plant for smelting to obtain metallic zinc. This process is complicated, the working environment is poor, the workload is large, and the feasibility of waste galvanized sheets is not strong. Although it has a certain effect on zinc removal, it has a large loss on the substrate, and the zinc recovery rate is not high, which is easy to cause secondary pollution.

[0109] The method of vacuum baking to recover zinc from galvanized steel sheets is: place the hot-dip galvanized scrap steel sheets in a vacuum furnace, raise the furnace temperature to above 900°C, and maintain the vacuum degree in the furnace <13Pa, so that the zinc on the surface of the steel sheet is melted and enriched. The recovery rate of high-purity zinc recovered by this method is >97%. However, its cost is very high and difficult to control. The recovery rate of zinc is also not high.

[0110] In the present application, the process is simple and convenient, and the potential difference between zinc and iron metal is utilized, combined with auxiliary stirring, to improve the activity of the reaction interface and the dissolution rate of zinc. At the same time, the cost is low and it is environmentally friendly.

[0111] In summary, the mechanical stirring auxiliary mechanism provided in the embodiment of the present invention is suitable for auxiliary stirring of a mixed phase of a solid material with a large volume and a heavy weight and a solution, overcoming the problem that traditional stirring tools cannot effectively perform stirring tasks. It can be applied to auxiliary stirring of zinc recovery, which has positive significance for improving the efficiency and adequacy of zinc recovery.

[0112] The galvanized steel plate zinc recovery system provided by the embodiment of the present invention can effectively exert the stirring effect during the recovery process, overcoming the problem that traditional stirring tools cannot effectively perform the stirring task, and has positive significance for improving the efficiency and adequacy of zinc recovery.

[0113] The method for recovering zinc from a galvanized steel sheet provided by the embodiment of the present invention is simple and efficient, has a simple process, is low in cost, and is environmentally friendly.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mechanical stirring auxiliary mechanism, characterized in that: include: Mixing vessel, isolating ring, drainage tube, control sleeve and power pump; The isolation ring is arranged on the inner bottom wall of the stirring container, and the central axis of the isolation ring is arranged along the height direction of the stirring container; the side wall of the isolation ring is provided with a liquid hole penetrating the isolation ring; The drainage tube is arranged outside the isolation ring and extends along the circumference of the isolation ring, a gap is left between the two ends of the drainage tube, and one end of the drainage tube is a closed structure; the drainage tube is provided with a notch, the notch is located on the side close to the isolation ring, the notch penetrates from the outer wall to the internal space, and the notch extends along the length direction; The control sleeve is slidably mounted on the drainage tube, and the inner wall of the control sleeve is in contact with the outer wall of the drainage tube; the control sleeve is driven by a first driver so that the control sleeve can reciprocate between the two ends of the drainage tube; The power pump is arranged inside the drainage tube and located at the mouth of the drainage tube, so as to transport the liquid inside the drainage tube to the outside.

2. The mechanical stirring auxiliary mechanism according to claim 1, characterized in that: The outer wall of the open end of the drainage tube has a first annular flange, and the outer wall of the closed end of the drainage tube has a second annular flange; the first annular flange and the second annular flange are coaxial and spaced apart; The mechanical stirring auxiliary mechanism also includes: a guide member; the guide member is in a semicircular ring shape, and the guide member is fitted between the first annular flange and the second annular flange; the cylindrical surface corresponding to the guide member is coaxially arranged with the first annular flange and the second annular flange; along the circumference of the first annular flange and the second annular flange, the guide member can be slidably fitted between the first annular flange and the second annular flange, and the guide member is driven by a second driver.

3. The mechanical stirring auxiliary mechanism according to claim 2, characterized in that: The mechanical stirring auxiliary mechanism further comprises: a sampling tube; the sampling tube comprises: an outer tube body, a sliding member, a telescopic inner liner, a first driving column and a second driving column; The sliding member can be slidably fitted in the outer tube body; The telescopic inner liner is disposed in the outer tube body, the bottom of the telescopic inner liner is fixedly connected to the sliding member, the mouth of the telescopic inner liner is coaxially arranged with the mouth of the outer tube body, and the periphery of the mouth of the telescopic inner liner is attached to and fixedly connected with the periphery of the mouth of the outer tube body; The first driving column extends through the mouth of the outer tube to the inside of the telescopic inner liner and is fixedly connected to the bottom of the telescopic inner liner, and the second driving column is fixedly connected to an end of the first driving column away from the sliding member; the outer diameter of the second driving column is larger than the outer diameter of the first driving column, and the outer diameter of the second driving column is adapted to the inner diameter of the mouth of the outer tube; when the sliding member moves to the bottom end of the outer tube, the second driving column is just interference fit with the mouth of the outer tube; In the initial state, the sliding member is located at the mouth of the outer tube, and the telescopic liner is compressed; The guide member is provided with a receiving hole, and the receiving hole is arranged along the axis center line direction of the cylindrical surface corresponding to the guide member; the outer tube body of the sampling tube is detachably received in the receiving hole; The control sleeve is provided with a pushing member. When the control sleeve moves to the end of the drainage tube, the pushing member can push the second driving column toward the inside of the outer tube body so that the second driving column is interference fit with the mouth of the outer tube body, thereby completing sample collection.

4. The mechanical stirring auxiliary mechanism according to claim 3, characterized in that: Along the arc-shaped extension direction of the flow guide, the plurality of accommodating holes are sequentially spaced apart; The mechanical stirring auxiliary mechanism further includes: a controller; the first driver and the second driver are both electrically connected to the controller; The first driver is used to drive the control sleeve to continuously reciprocate along the drainage tube; the second driver is used to drive the flow guide to rotate at a constant speed in a clockwise direction or a counterclockwise direction; The controller is used to control the first driver and the second driver so that after the control sleeve completes n reciprocating motions, when the control sleeve reaches the end where the guide member is located, the pushing member can align with the second driving column of a sampling tube located on the guide member and push the second driving column to enable the corresponding sampling tube to complete sample collection.

5. A zinc recovery system for galvanized steel sheet, characterized in that: It comprises a mechanical stirring auxiliary mechanism as described in any one of claims 1 to 4.

6. A method for recovering zinc from a galvanized steel sheet, characterized in that: The steps include: S1. Place the galvanized steel sheet to be recycled into the stirring container of the mechanical stirring auxiliary mechanism according to any one of claims 1 to 4, and place the galvanized steel sheet to be recycled within the isolation ring; S2, adding an alkaline solution with a concentration of 1 to 8 mol / L into the stirring container, wherein the temperature of the alkaline solution is 10 to 100° C.; S3, disposing an iron cathode for a galvanic cell reaction in the stirring container; S4, turning on the mechanical stirring auxiliary mechanism and soaking for 10 to 90 minutes.

7. The method for recovering zinc from a galvanized steel sheet according to claim 6, characterized in that: The alkaline solution is any one of NaOH solution, KOH solution and ammonia solution.

8. The method for recovering zinc from a galvanized steel sheet according to claim 6, characterized in that: The mass ratio of the alkaline solution to the galvanized steel sheet to be recycled is (3-15):

1.

9. The method for recovering zinc from a galvanized steel sheet according to claim 6, characterized in that: The side length of the galvanized steel sheet to be recycled is less than or equal to 50 cm.

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