Vacuum distillation furnace of a high-tin material recovery system

Abstract

The present invention provides a vacuum distillation furnace for a high-tin material recovery system, which includes a multi-stage vacuum distillation unit, a condensate scraping unit and a control unit; the multi-stage vacuum distillation unit includes an evaporation disk group that can rotate around the central axis and a condensate disk group that can be lifted and lowered. A plurality of evaporation disks are arranged at intervals in the vertical direction and the outer diameters increase step by step from top to bottom. A plurality of condensate disks are respectively buckled on the corresponding evaporation disks and one side of each is communicated with a condensation pipe. The condensate scraping unit includes a rotating shaft that can rotate around the central axis and a plurality of scrapers arranged at intervals in the vertical direction on the same side of the rotating shaft. The lower surfaces of the scrapers are respectively flush with the upper surfaces of the evaporation disks at all levels. The control unit is configured to control the lifting of the condensate disks at all levels and their separation from the evaporation disks, the rotation of the evaporation disks at all levels, and the horizontal movement of the scrapers towards the surfaces of the evaporation disks at all levels to scrape off the condensates on the surface of the tin liquid in the evaporation disks. The present invention can effectively remove the condensates on the surface of the tin liquid on the premise of not shutting down the machine and not opening the furnace, improving the distillation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of production for recycling non-ferrous metal waste, and in particular provides a vacuum distillation furnace for a high-tin material recovery system. Background Art

[0002] Metallic tin is widely used in the industrial production process. Recycling non-ferrous metals from renewable resources is an important part of the sustainable development of the non-ferrous metal industry, and it has been increasingly emphasized by environmental protection departments and the non-ferrous metal industry. When recycling tin, a vacuum distillation furnace is usually required to perform vacuum distillation refining on the melted tin liquid. The principle of separating and purifying metals by vacuum distillation is to utilize the different vapor pressures generated by each component of the liquid alloy and perform metal separation and enrichment under conditions lower than atmospheric pressure. Taking lead removal as an example, the vacuum distillation refining of tin is based on the significant vapor pressure difference between tin and lead at the same temperature. In the temperature range of 1073 - 1473K, the vapor pressure of pure lead is 2000 - 8750 times that of pure tin, and as the temperature increases, the vapor pressure ratio decreases. In the temperature range of 1373 - 1473K, in crude tin containing 1% lead, the vapor pressure of lead is 1123 - 1720 times that of tin. Therefore, as long as an appropriate distillation temperature is selected, lead in the crude tin can be volatilized to achieve the purpose of purifying tin.

[0003] During the vacuum distillation refining process of tin, after a period of distillation, condensates will form on the surface of the tin liquid in the evaporation pan, which affects the volatilization rate of lead, reduces the distillation efficiency and purification accuracy. The current vacuum distillation furnace does not have a special structure for this problem, and no other feasible solutions have been proposed in the industry. Only the method of stopping distillation every once in a while and opening the vacuum distillation furnace to scrape the condensates on the surface of the tin liquid can be adopted. The process operation is complex, time-consuming, causes frequent interruptions in distillation for a long time, and reduces the distillation efficiency. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a vacuum distillation furnace for a high-tin material recovery system, which can remove the condensates on the surface of the tin liquid in the evaporation pan while keeping the furnace body in a closed state during the vacuum distillation process, ensure the continuous progress of vacuum distillation, avoid frequent long-term interruptions in vacuum distillation, and improve the efficiency of vacuum distillation.

[0005] To achieve the above purpose, the present invention provides a vacuum distillation furnace for a high-tin material recovery system, and the vacuum distillation furnace includes a multi-stage vacuum distillation unit, a condensate scraping unit, and a control unit;

[0006] The multi-stage vacuum distillation unit includes an evaporation tray group, a condensation tray group, and a condensation and separation tube. The evaporation tray group includes a plurality of evaporation trays arranged at intervals in the vertical direction and with the outer diameter gradually increasing from top to bottom. The condensation tray group includes a plurality of condensation trays buckled on each stage of evaporation trays. The condensation and separation tube is arranged vertically and communicated with each stage of condensation trays. The evaporation tray group is drivingly connected to a rotation mechanism, and the condensation tray group is drivingly connected to a lifting mechanism;

[0007] The condensate scraping unit includes a rotating shaft, a scraper, and a swinging mechanism. The rotating shaft is arranged vertically and can rotate around the central axis. The number of scrapers is the same as the number of stages of vacuum distillation and they are arranged at intervals in the vertical direction on the same side of the rotating shaft. The lower surfaces of the scrapers are respectively flush with the upper surfaces of each stage of evaporation trays. The swinging mechanism is drivingly connected to the rotating shaft;

[0008] The control unit is electrically connected to the rotation mechanism, the lifting mechanism, and the swinging mechanism, and is configured to control the lifting mechanism to drive each stage of condensation trays to be lifted synchronously and separated from the evaporation trays, control the rotation mechanism to drive each stage of evaporation trays to rotate synchronously, and control the swinging mechanism to drive each scraper to horizontally move towards the surfaces of each stage of evaporation trays to scrape the condensate on the surface of the tin liquid in the evaporation trays.

[0009] Preferably, the multi-stage vacuum distillation unit further includes a feed pipe, a discharge pipe, and a connecting column. The connecting column is arranged vertically, with its lower end connected to the drive shaft of the rotation mechanism and its upper end fixedly connected to the centers of each stage of evaporation trays in sequence. A central hole is provided at the center of each stage of condensation trays, and the central hole is movably sleeved with the connecting column. The part of the connecting column above the last stage of evaporation tray is hollow. The part of the connecting shaft between adjacent evaporation trays is provided with lateral communication holes. The feed pipe is fixedly arranged at the top of the furnace body, and its end located inside the furnace body is set as a telescopic structure and communicated with the first stage of condensation trays. The discharge pipe is fixedly arranged at the lower part of the furnace body side wall. A receiving groove is provided directly below the lower port of the condensation and separation tube, and the receiving groove is communicated with the end of the discharge pipe located inside the furnace body.

[0010] Preferably, the number of the multi-stage vacuum distillation units is two, namely a first distillation unit and a second distillation unit arranged side by side;

[0011] The first distillation unit includes a first evaporation tray group and a first rotation mechanism. The first rotation mechanism is drivingly connected to the connecting column of the first evaporation tray group. The second distillation unit includes a second evaporation tray group and a second rotation mechanism. The second rotation mechanism is drivingly connected to the connecting column of the second evaporation tray group. The control unit is electrically connected to both the first rotation mechanism and the second rotation mechanism, and is configured to drive the first evaporation tray group and the second evaporation tray group to rotate alternately.

[0012] Preferably, the first distillation unit further includes a first condensate pan group, a first condensate separation tube, and a first lifting mechanism. The first lifting mechanism is drivingly connected to the first-stage condensate pan of the first condensate pan group. The condensate pans of each stage in the first condensate pan group are connected into a whole through the first condensate separation tube provided on one side. The second distillation unit further includes a second condensate pan group, a second condensate separation tube, and a second lifting mechanism. The second lifting mechanism is drivingly connected to the first-stage condensate pan of the second condensate pan group. The condensate pans of each stage in the second condensate pan group are connected into a whole through the second condensate separation tube provided on one side. The control unit is electrically connected to both the first lifting mechanism and the second lifting mechanism, and is configured to drive the first condensate pan group and the second condensate pan group to alternately lift and lower.

[0013] Preferably, a first graphite heating element is provided below the last-stage evaporation pan of the first evaporation pan group, and a second graphite heating element is provided below the last-stage evaporation pan of the second evaporation pan group. The control unit is electrically connected to both the first graphite heating element and the second graphite heating element, and is configured to control the corresponding graphite heating element to stop heating when the condensate pan group in the multi-stage vacuum distillation unit rises and leaves the evaporation pan group.

[0014] Preferably, the vacuum distillation furnace further includes a condensate scraping unit. The condensate scraping unit includes a support rod and a brush body. The support rod is arranged vertically, and a plurality of brush bodies are arranged vertically at intervals on one side of the support rod relative to the rotating shaft. The number of brush bodies is the same as the number of scraping plates and their heights correspond one by one. Each brush body is located on the horizontal movement path of the corresponding scraping plate.

[0015] Preferably, the rotating shaft is arranged at the middle front side of the first distillation unit and the second distillation unit, and the support rod is arranged at the middle rear side of the first distillation unit and the second distillation unit. The swinging mechanism drives the rotating shaft to swing reciprocally between the two distillation units, so as to drive the scraping plate to swing alternately onto the surface of the first evaporation pan group or the second evaporation pan group to scrape the condensate on the surface of the tin liquid.

[0016] Preferably, the brush body includes an upper brush plate and a lower brush plate which are symmetrically arranged up and down, and bristles provided on the opposite surfaces of the two brush plates. The scraping plate horizontally moves between the upper and lower brush plates to horizontally scrape the condensate on the surface of the scraping plate.

[0017] Preferably, the upper brush plate and the lower brush plate are arranged such that the width gradually increases from the rotating shaft to the support rod.

[0018] Preferably, the condensate scraping unit further includes a longitudinal guide rail and a reciprocating mechanism. The longitudinal guide rail is arranged at the bottom of the furnace body of the vacuum distillation furnace along the direction of the line connecting the support rod and the rotating shaft. The bottom of the support rod is slidably arranged in the longitudinal guide rail. The reciprocating mechanism is drivingly connected to the support rod and electrically connected to the control unit. By driving the support rod, each brush body is driven to reciprocate along the longitudinal guide rail to longitudinally scrape the condensate on the surface of the scraper.

[0019] Compared with the prior art, the technical solution of the present invention has at least the following advantages:

[0020] 1. For each distillation unit of the present invention, a multi-stage evaporation disk group and a multi-stage condensation disk with an opening and closing configuration are provided. Through the control of the control unit, the efficient distillation of the tin liquid and the coordinated operation of condensate scraping are realized. Specifically, when the condensation disk and the evaporation disk are in a buckled state, the scraper leaves, and the graphite heating body heats the multi-stage evaporation disk simultaneously to achieve efficient distillation. After distillation for a period of time, the condensation disk is controlled to rise and separate from the evaporation disk, and the scraper moves horizontally above the evaporation disk. Cooperating with the circumferential rotation of the evaporation disk, the scraping operation of the condensate on the surface of the tin liquid in the evaporation disk is completed. This not only avoids the continuous accumulation of condensate affecting the distillation efficiency but also does not require opening the furnace body of the vacuum distillation furnace for a long time. The entire scraping operation is simple and efficient, ensuring the distillation operation efficiency.

[0021] 2. The present invention sets a first distillation unit and a second distillation unit arranged side by side in the distillation furnace, and sets the rotating shaft of the condensate scraping unit on one side in the middle of the two distillation units. By controlling the reciprocating movement of the scraper between the two distillation units and the alternating lifting of the condensation disk groups, the alternating rotation of the evaporation disk groups, and the alternating heating of the graphite heating bodies of the two distillation units, when one distillation unit is performing the condensate scraping operation, other distillation units can continue the distillation operation, realizing a reasonable combination of heating distillation and condensate scraping, and further improving the distillation operation efficiency.

[0022] 3. The present invention is provided with a condensate brushing unit in cooperation with the condensate scraping unit. By setting brush bodies with the same height as each scraper and located on the horizontal movement path of the corresponding scraper, the timely cleaning of the condensate on the surface of the scraper is realized. Further, upper and lower brush plates, bristles, a longitudinal guide rail, and a reciprocating mechanism are set to comprehensively clean the surface of the scraper from two vertical directions, so that the scraper moves to the surface of the next evaporation disk in a clean state, avoiding the condensate adhered to the surface of the scraper from entering the evaporation disk and causing secondary pollution, and better achieving the scraping effect of the condensate. Description of the Drawings

[0023] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 It is a schematic diagram of the external structure of the vacuum distillation furnace according to Embodiment 1 of the present invention;

[0025] Figure 2 is Figure 1 A schematic diagram of the structure of the vacuum distillation furnace after removing part of the housing in;

[0026] Figure 3 is Figure 2 The front view of;

[0027] Figure 4 is Figure 2 The partial enlarged view of position A in;

[0028] Figure 5 is Figure 1 The bottom view of the vacuum distillation furnace in;

[0029] Figure 6 is Figure 2 The schematic diagram of the structure of the first evaporation pan group in;

[0030] Figure 7 is Figure 2 The schematic diagram of the structure of the first condensation pan group in;

[0031] Figure 8 It is a schematic diagram of the structure when the first evaporation pan group and the first condensation pan group are assembled;

[0032] Figure 9 is Figure 2 The schematic diagram of the structure of the condensate scraping unit in;

[0033] Figure 10 is Figure 2 The schematic diagram of the structure of the condensate brushing unit in;

[0034] Figure 11 It is a schematic diagram of the structure when the brush brushes the condensate on the scraper;

[0035] Figure 12 It is a schematic diagram of the structure when the scraper scrapes the condensate on the evaporation pan group.

[0036] Explanation of the attached drawing reference numerals:

[0037] 1 - Furnace body;

[0038] 2 - First distillation unit, 21 - First evaporation pan group, 22 - First connecting column, 23 - First lateral communication hole, 24 - First condensation pan group, 25 - First condensation tube, 26 - First graphite heating element, 27 - First rotating mechanism, 28 - First lifting mechanism, 29 - First discharge pipe, 210 - First receiving tank, 211 - First feed pipe;

[0039] 3 - Second distillation unit, 31 - Second evaporation tray group, 32 - Second condensation tray group, 33 - Second condensation tube, 34 - Second graphite heating element, 35 - Second rotating mechanism, 36 - Second lifting mechanism;

[0040] 4 - Condensate scraping unit, 41 - Rotating shaft, 42 - Scraper, 43 - Rocking mechanism;

[0041] 5 - Condensate brushing unit, 51 - Support rod, 52 - Upper brush plate, 53 - Brush bristles, 54 - Lower brush plate, 55 - Longitudinal guide rail, 56 - Reciprocating mechanism. Detailed implementation manners

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] The present invention provides a vacuum distillation furnace for a high - tin material recovery system, including a multi - stage vacuum distillation unit, a condensate scraping unit and a control unit.

[0044] The multi - stage vacuum distillation unit includes an evaporation tray group, a condensation tray group and a condensation tube. The evaporation tray group includes a plurality of evaporation trays arranged at intervals in the vertical direction and with the outer diameter increasing step by step from top to bottom. The condensation tray group includes a plurality of condensation trays buckled on each stage of evaporation trays. The condensation tube is arranged vertically and communicated with each stage of condensation trays. The evaporation tray group is drivingly connected to a rotating mechanism, and the condensation tray group is drivingly connected to a lifting mechanism.

[0045] The condensate scraping unit includes a rotating shaft, a scraper and a rocking mechanism. The rotating shaft is arranged vertically and can rotate around the central axis. The number of scrapers is the same as the number of stages of vacuum distillation and is arranged at intervals in the vertical direction on the same side of the rotating shaft. The lower surfaces of the scrapers are respectively flush with the upper surfaces of each stage of evaporation trays. The rocking mechanism is drivingly connected to the rotating shaft.

[0046] The control unit is electrically connected to the rotating mechanism, the lifting mechanism and the rocking mechanism, and is configured to control the lifting mechanism to drive each stage of condensation trays to be lifted synchronously and separated from the evaporation trays, control the rotating mechanism to drive each stage of evaporation trays to rotate synchronously, and control the rocking mechanism to drive each scraper to horizontally move towards the surfaces of each stage of evaporation trays to scrape the condensate on the surface of the tin liquid in the evaporation trays.

[0047] Embodiment 1

[0048] This embodiment provides a specific solution for the vacuum distillation furnace of the high-tin material recovery system in the present invention, as follows Figures 1 - 12 As shown, in this embodiment, the number of multi-stage vacuum distillation units is two, namely the first distillation unit 2 and the second distillation unit 3 arranged side by side.

[0049] The first distillation unit 2 includes a first evaporation tray group 21, a first connecting column 22, a first condensation tray group 24, a first condensation and separation pipe 25, a first graphite heating element 26, a first rotating mechanism 27, a first lifting mechanism 28, a first discharge pipe 29, a first receiving tank 210 and a first feed pipe 211.

[0050] The first evaporation tray group 21 includes a plurality of evaporation trays arranged at intervals in the vertical direction and with the outer diameter gradually increasing from top to bottom. The first condensation tray group 24 includes a plurality of condensation trays arranged at intervals in the vertical direction and with the outer diameter gradually increasing from top to bottom. Each condensation tray is respectively and correspondingly buckled on each evaporation tray. The first condensation and separation pipe 25 is arranged vertically on one side of the first condensation tray group 24 and is sequentially communicated with each stage of condensation trays from top to bottom. The first rotating mechanism 27 is arranged at the bottom of the furnace body 1. The first connecting column 22 is arranged vertically. Its lower end is connected to the driving shaft of the first rotating mechanism 27, and its upper end is sequentially fixedly connected to the centers of each stage of evaporation trays. A central hole is provided at the center of each condensation tray, and the central hole is movably sleeved with the first connecting column 22. The part of the first connecting column 22 above the last stage of evaporation tray is hollow to allow the tin liquid to be distilled to flow into each stage of evaporation trays in sequence. The part of the first connecting column 22 between adjacent evaporation trays is provided with a first lateral communication hole 23. The lowest point of each first lateral communication hole 23 is at the same height as the upper opening edge of the lower evaporation tray. The first lifting mechanism 28 is arranged at the top of the furnace body 1 and its driving shaft is connected to the upper surface of the first-stage condensation tray of the first condensation tray group 24. Each stage of condensation trays is connected into a whole through the first condensation and separation pipe 25 arranged on the same side. The first graphite heating element 26 is arranged below the last stage of evaporation tray of the first evaporation tray group 21 for heating and distilling the tin liquid in the whole first evaporation tray group 21. The first feed pipe 211 is fixedly arranged at the top of the furnace body 1. The end of it located inside the furnace body 1 is set as a telescopic structure and is communicated with the first-stage condensation tray. The first discharge pipe 29 is fixedly arranged at the lower part of the side wall of the furnace body. A first receiving tank 210 is arranged directly below the lower port of the first condensation and separation pipe 25. The first receiving tank 210 is communicated with the end of the first discharge pipe 29 located inside the furnace body 1.

[0051] Since the structures of the two distillation units are the same, the second distillation unit 3 includes a corresponding second evaporation tray group 31, second connecting columns, second condensation tray group 32, second condensation and precipitation pipe 33, second graphite heating body 34, second rotating mechanism 35, second lifting mechanism 36, second discharge pipe, second receiving tank and second feed pipe. The positions and connection relationships between the respective structural members are exactly the same as those described above for the second distillation unit 2. It should be noted that the second connecting columns, second discharge pipe, second receiving tank and second feed pipe are not marked in the drawings.

[0052] In this embodiment, both the first evaporation tray group 21 and the first condensation tray group 24 are set as three-stage tray groups, and the first stage and the last stage are both in the order from top to bottom.

[0053] In this embodiment, the part of the feed pipe inside the furnace body is set as a telescopic structure, and a condensation and precipitation pipe and a receiving tank that are vertically opposite and have no connection relationship are provided, so that the condensation trays can be freely lifted and lowered while not affecting the feeding and discharging functions.

[0054] As Figure 9 、The condensate scraping unit 4 includes a rotating shaft 41, a scraping plate 42 and a swinging mechanism 43. The rotating shaft 41 is arranged vertically and can rotate around the central axis. A plurality of scraping plates 42 are arranged at intervals vertically on the same side of the rotating shaft. The lower surfaces of the respective scraping plates are flush with the upper surfaces of the respective evaporation trays. The swinging mechanism 43 is arranged at the bottom of the furnace body 1 and is drivingly connected to the bottom of the rotating shaft 41.

[0055] The vacuum distillation furnace of this embodiment further includes a condensate brushing unit 5. The condensate brushing unit 5 includes a support rod 51 and a brushing body. The support rod 51 is arranged vertically. A plurality of brushing bodies, which are the same in number as the scraping plates 42, are arranged at intervals vertically on the side of the support rod 51 opposite to the rotating shaft 41. The respective brushing bodies correspond to the respective scraping plates in height one by one, and each brushing body is located on the horizontal movement path of the corresponding scraping plate.

[0056] In this embodiment, the number of both the scraping plates 42 and the brushing bodies is set to three.

[0057] In this embodiment, the brushing body includes an upper brushing plate 52 and a lower brushing plate 54 that are symmetrically arranged up and down and bristles 53 arranged on the opposite surfaces of the two brushing plates. The scraping plate 42 horizontally moves between the upper and lower brushing plates to horizontally brush the condensate on the surface of the scraping plate 42.

[0058] In this embodiment, the condensate scraping unit 5 further includes a longitudinal guide rail 55 and a reciprocating mechanism 56. The longitudinal guide rail 55 is arranged at the bottom of the furnace body 1 of the vacuum distillation furnace along the direction of the line connecting the support rod 51 and the rotating shaft 41. The bottom of the support rod 51 is slidably arranged in the longitudinal guide rail 55. The reciprocating mechanism 56 is arranged at the bottom of the furnace body 1 and is drivingly connected to the bottom of the support rod 51. The support rod 51 drives each brush body to reciprocate along the longitudinal guide rail 55 to longitudinally scrape the condensate on the surface of the scraper 42.

[0059] The control unit is electrically connected to both the first rotating mechanism 27 and the second rotating mechanism 35, and is configured to drive the first evaporation tray group 21 and the second evaporation tray group 31 to rotate alternately; the control unit is electrically connected to both the first lifting mechanism 28 and the second lifting mechanism 36, and is configured to drive the first condensation tray group 24 and the second condensation tray group 32 to lift alternately; the control unit is electrically connected to both the first graphite heating element 26 and the second graphite heating element 34, and is configured to control the corresponding graphite heating element to stop heating when the condensation tray group in a certain distillation unit rises and leaves the evaporation tray group; the control unit is electrically connected to the reciprocating mechanism 56; the control unit is electrically connected to the swing mechanism 43 and is configured to drive the rotating shaft 41 to drive each scraper to horizontally move towards the distillation unit that stops heating.

[0060] In order to achieve a reasonable combination of the distillation process and the condensate scraping process, further save the space inside the furnace and improve the distillation operation efficiency, in this embodiment, the rotating shaft 41 is arranged at the middle front side between the first distillation unit 2 and the second distillation unit 3, the support rod 51 is arranged at the middle rear side between the first distillation unit 2 and the second distillation unit 3, and the swing mechanism 43 drives the rotating shaft 41 to reciprocate between the two distillation units to drive the scraper 42 to alternately swing to the surface of the first evaporation tray group 21 or the second evaporation tray group 31 to scrape the condensate on the surface of the tin liquid.

[0061] In this embodiment, since the path passed by the scraper 42 during swinging is fan-shaped, in order to maximize the removal of the condensate on the scraper 42, the upper brush plate 52 and the lower brush plate 54 are arranged such that the width gradually increases from the rotating shaft 41 to the support rod 51 to extend the contact time of the bristles 53 with the scraper 42. Specifically, a fan-shaped ring or a trapezoid can be adopted.

[0062] The working process of the above vacuum distillation furnace is as follows:

[0063] A vacuum environment is established inside the vacuum distillation furnace, and the condensation plate group and the evaporation plate group are controlled to be in a buckled state. The graphite heating body heats the evaporation plate group and controls the internal temperature. After the solder containing lead impurities is heated and melted, it is transported through the feeding pipe to the uppermost evaporation plate of the evaporation plate group and sequentially flows into the lower evaporation plates. Each stage of evaporation plate conducts distillation respectively. The metal vapor is collected into the condensation and separation pipe through the corresponding stages of condensation plates, and finally is output from the receiving tank and the discharging pipe in sequence.

[0064] After distillation for a period of time, the first graphite heating body 26 is controlled to stop heating. The first lifting mechanism 28 drives the first condensation plate group 24 to rise and separate from the first evaporation plate group 21. The first rotating mechanism 27 drives the first evaporation plate group 21 to rotate. The swinging mechanism 43 drives the rotating shaft 41 to rotate and drives each scraper 42 to horizontally move above each stage of evaporation plate to scrape the condensate on the surface of the tin liquid in the evaporation plate.

[0065] After the scraping operation of the condensate in the first distillation unit 2 is completed, the swinging mechanism 43 drives the rotating shaft 41 to rotate in the reverse direction, driving each scraper 42 to horizontally move above each stage of evaporation plate in the second distillation unit 3. The first evaporation plate group 21 is controlled to stop rotating. The first condensation plate group 24 descends and tightly buckles with the first evaporation plate group 21. The first graphite heating body 26 starts heating. At this time, the first distillation unit 2 continues the distillation operation. At the same time, in the second distillation unit 3, the second graphite heating body 34 is controlled to stop heating. The second lifting mechanism 36 drives the second condensation plate group 32 to rise and separate from the second evaporation plate group 31. The second rotating mechanism 35 drives the second evaporation plate group 31 to rotate, and cooperates with the scraper 42 to scrape the condensate on the surface of the tin liquid in the second distillation unit 3.

[0066] During the process of the swinging mechanism 43 driving the rotating shaft 41 to rotate bidirectionally, the reciprocating mechanism 56 drives the support rod 51 to move along the longitudinal guide rail 55, so that when the scraper 42 moves horizontally relative to the upper and lower brush plates, the upper and lower brush plates also move longitudinally relative to the scraper 42, cleaning the scraper 42 to the greatest extent.

[0067] The above processes are carried out alternately to realize scraping the condensate on the surface of the tin liquid in the first distillation unit 2 and the second distillation unit 3 at different time periods respectively, and always keep one of the distillation units in the distillation operation state, effectively improving the distillation efficiency of the entire vacuum distillation furnace.

[0068] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A vacuum distillation furnace for a high-tin material recovery system, characterized in that: The vacuum distillation furnace comprises a multi-stage vacuum distillation unit, a condensate scraping unit and a control unit; The multi-stage vacuum distillation unit comprises an evaporation pan group, a condensation pan group and a condensation precipitate tube, wherein the evaporation pan group comprises a plurality of evaporation pans arranged vertically at intervals and having outer diameters increasing step by step from top to bottom, the condensation pan group comprises a plurality of condensation pans buckled and arranged on the evaporation pans of each stage, the condensation precipitate tube is arranged vertically and communicated with the condensation pans of each stage, the evaporation pan group is drivingly connected to a rotating mechanism, and the condensation pan group is drivingly connected to a lifting mechanism; The number of the multi-stage vacuum distillation units is two, namely a first distillation unit (2) and a second distillation unit (3) arranged side by side; the first distillation unit (2) comprises a first evaporation pan group (21) and a first rotating mechanism (27), and the second distillation unit (3) comprises a second evaporation pan group (31) and a second rotating mechanism (35); The condensate scraping unit (4) comprises a rotating shaft (41), a scraper (42) and a swing mechanism (43); the rotating shaft (41) is arranged vertically and can rotate around a central axis; the number of the scrapers (42) is consistent with the number of vacuum distillation stages and they are arranged vertically at intervals on the same side of the rotating shaft (41); the lower surface of each scraper (42) is flush with the upper surface of each stage of the evaporation disk; and the swing mechanism (43) is drivingly connected to the rotating shaft (41); The swing mechanism (43) drives the rotating shaft (41) to swing back and forth between the two distillation units, thereby driving the scraper (42) to swing alternately to the surface of the first evaporation plate group (21) or the second evaporation plate group (31), so as to scrape off condensates on the surface of the tin liquid; The control unit is connected to the rotating mechanism, the lifting mechanism, and the swinging mechanism (43) via electrical signals, and is configured to control the lifting mechanism to drive the condensation plates of each level to be synchronously lifted and separated from the evaporation plate, control the rotating mechanism to drive the evaporation plates of each level to rotate synchronously, and control the swinging mechanism (43) to drive the scrapers (42) to synchronously move horizontally toward the surface of the evaporation plates of each level, so as to scrape off condensate on the surface of the tin liquid in the evaporation plate.

2. The vacuum distillation furnace of the high-tin material recovery system according to claim 1, characterized in that: The multi-stage vacuum distillation unit further comprises a feed pipe, a discharge pipe and a connecting column. The connecting column is arranged vertically and has a lower end connected to a driving shaft of a rotating mechanism and an upper end fixedly connected to the center of each stage of evaporation disks in sequence. The center of each stage of condensation disks is provided with a center hole, and the center hole is movably fitted with the connecting column. The portion of the connecting column located above the last stage of evaporation disk is hollow, and the portion of the connecting column located between adjacent evaporation disks is provided with a lateral connecting hole. The feed pipe is fixedly arranged on the top of the furnace body (1), and one end of the feed pipe located inside the furnace body (1) is arranged as a telescopic structure and is connected to the first stage of condensation disk. The discharge pipe is fixedly arranged on the lower part of the side wall of the furnace body (1), and a receiving groove is arranged directly below the lower end of the condensation tube, and the receiving groove is connected to one end of the discharge pipe located inside the furnace body.

3. The vacuum distillation furnace of the high-tin material recovery system according to claim 2, characterized in that: The first rotating mechanism (27) is drivingly connected to the connecting column of the first evaporation tray group (21), and the second rotating mechanism (35) is drivingly connected to the connecting column of the second evaporation tray group (31). The control unit is electrically connected to the first rotating mechanism (27) and the second rotating mechanism (35), and is configured to drive the first evaporation tray group (21) and the second evaporation tray group (31) to rotate alternately.

4. The vacuum distillation furnace of the high-tin material recovery system according to claim 3, characterized in that: The first distillation unit (2) further comprises a first condensation pan group (24), a first cold precipitate pipe (25) and a first lifting mechanism (28); the first lifting mechanism (28) is drivingly connected to the first stage condensation pan of the first condensation pan group (24); the condensation pans of each stage of the first condensation pan group (24) are connected as a whole through the first cold precipitate pipe (25) arranged on one side; the second distillation unit (3) further comprises a second condensation pan group (32), a second cold precipitate pipe (33) and a second lifting mechanism (36); the second lifting mechanism (36) is drivingly connected to the first stage condensation pan of the second condensation pan group (32); the condensation pans of each stage of the second condensation pan group (32) are connected as a whole through the second cold precipitate pipe (33) arranged on one side; the control unit is electrically connected to the first lifting mechanism (28) and the second lifting mechanism (36), and is configured to drive the first condensation pan group (24) and the second condensation pan group (32) to alternately rise and fall.

5. The vacuum distillation furnace of the high-tin material recovery system according to claim 3, characterized in that: A first graphite heating body (26) is arranged below the last stage evaporation pan of the first evaporation pan group (21), and a second graphite heating body (34) is arranged below the last stage evaporation pan of the second evaporation pan group (31). The control unit is electrically connected to the first graphite heating body (26) and the second graphite heating body (34), and is configured to control the corresponding graphite heating body to stop heating when the condensation pan group in the multi-stage vacuum distillation unit rises and leaves the evaporation pan group.

6. The vacuum distillation furnace of the high-tin material recovery system according to any one of claims 1 to 5, characterized in that: The vacuum distillation furnace further comprises a condensate brushing unit (5), wherein the condensate brushing unit (5) comprises a support rod (51) and a brush body, wherein the support rod (51) is arranged vertically, and a plurality of brush bodies are arranged vertically at intervals on one side of the support rod (51) relative to the rotating shaft (41), wherein the number of the brush bodies is consistent with the number of the scrapers (42) and the heights correspond one to one, and each brush body is located on the horizontal moving path of the corresponding scraper.

7. The vacuum distillation furnace of the high-tin material recovery system according to claim 6, characterized in that: The rotating shaft (41) is arranged at the front side between the first distillation unit (2) and the second distillation unit (3), and the supporting rod (51) is arranged at the rear side between the first distillation unit (2) and the second distillation unit (3).

8. The vacuum distillation furnace of the high-tin material recovery system according to claim 6, characterized in that: The brush body comprises an upper brush plate (52) and a lower brush plate (54) symmetrically arranged up and down, and bristles (53) arranged on opposite surfaces of the two brush plates. The scraper (42) moves horizontally between the upper and lower brush plates to horizontally brush away condensate on the surface of the scraper (42).

9. The vacuum distillation furnace of the high-tin material recovery system according to claim 8, characterized in that: The upper brush plate (52) and the lower brush plate (54) are arranged so that their widths gradually increase from the rotating shaft (41) toward the supporting rod (51).

10. The vacuum distillation furnace of the high-tin material recovery system according to claim 9, characterized in that: The condensate brushing unit (5) further comprises a longitudinal guide rail (55) and a reciprocating mechanism (56). The longitudinal guide rail (55) is arranged at the bottom of the furnace body (1) of the vacuum distillation furnace and is arranged along the direction of the line between the support rod (51) and the rotating shaft (41). The bottom of the support rod (51) is slidably arranged in the longitudinal guide rail (55). The reciprocating mechanism (56) is drive-connected to the support rod (51) and is electrically connected to the control unit. By driving the support rod (51), each brush body is driven to move back and forth along the longitudinal guide rail, so as to longitudinally brush away the condensate on the surface of the scraper (42).

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