Vacuum distillation furnace of high-tin material recovery system

Abstract

The invention provides a vacuum distillation furnace of a high-tin material recovery system. 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 disc group capable of rotating around a central axis and a liftable condensation disc group, a plurality of evaporation discs are vertically arranged at intervals, the outer diameters of the evaporation discs are gradually increased from top to bottom, a plurality of condensation discs are respectively buckled on the corresponding evaporation discs, and one side of each condensation disc is communicated with a condensation separation pipe; the condensate scraping unit comprises a rotating shaft capable of rotating around the central axis and a plurality of scraping plates vertically arranged on the same side of the rotating shaft at intervals, and the lower surface of each scraping plate is flush with the upper surface of each stage of evaporation disc; and the control unit is configured to control each stage of condensing disc to be lifted and separated from the evaporation disc, each stage of evaporation disc rotates, and each scraper horizontally moves towards the surface of each stage of evaporation disc so as to scrape condensate on the surface of tin liquid in the evaporation disc. According to the invention, the condensate on the surface of the tin liquid is effectively removed on the premise of no shutdown and no blow-in, and the distillation efficiency is improved.

Description

Technical Field

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

[0002] Tin metal is widely used in industrial production processes. Recycling non-ferrous metals from renewable resources is an important part of the sustainable development of the non-ferrous metal industry, and is increasingly valued by environmental protection departments and the non-ferrous metal industry. When recycling tin, a vacuum distillation furnace is usually required to perform vacuum distillation and refining operations on the melted tin liquid. The principle of vacuum distillation separation and purification of metals is to use the different vapor pressures generated by the components of the liquid alloy to separate and enrich the metals under conditions below atmospheric pressure. Taking lead removal as an example, the vacuum distillation and refining of tin is based on the obvious 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, the vapor pressure of lead in crude tin with a lead content of 1% is 1123-1720 times that of tin. Therefore, as long as the appropriate distillation temperature is selected, the lead in the crude tin can be volatilized to achieve the purpose of purifying tin.

[0003] During the vacuum distillation and refining process of tin, after a period of distillation, condensates will form on the surface of the tin liquid in the evaporation tray, affecting the volatilization rate of lead, reducing the distillation efficiency and purification accuracy. The current vacuum distillation furnace does not have a special structure for this problem, and the industry has not proposed other feasible solutions. The only way is to stop the distillation at regular intervals and open the vacuum distillation furnace to scrape off the condensates on the surface of the tin liquid. The process is complicated and time-consuming, resulting in frequent interruptions of distillation for a long time, reducing 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, so that during the vacuum distillation process, the condensate on the surface of the tin liquid in the evaporation plate can be removed while keeping the furnace body in a closed state, ensuring that the vacuum distillation can be carried out continuously, avoiding long-term and frequent interruptions of the vacuum distillation, and improving the efficiency of the vacuum distillation.

[0005] In order to achieve the above object, the present invention provides a vacuum distillation furnace of a high-tin material recovery system, the vacuum distillation furnace comprising 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 condensate scraping unit comprises a rotating shaft, a scraper and a swing mechanism, wherein the rotating shaft is arranged vertically and can rotate around a central axis, the number of the scrapers is consistent with the number of stages of vacuum distillation and they are arranged vertically at intervals on the same side of the rotating shaft, the lower surface of each scraper is flush with the upper surface of each stage of evaporation disk, and the swing mechanism is drivingly connected to the rotating shaft; The control unit is connected to the rotating mechanism, the lifting mechanism, and the swinging mechanism by electrical signals, and is configured to control the lifting mechanism to drive the condensation plates at various levels to be synchronously lifted and separated from the evaporation plates, control the rotating mechanism to drive the evaporation plates at various levels to rotate synchronously, and control the swinging mechanism to drive the scrapers to synchronously move horizontally toward the surface of the evaporation plates at various levels, so as to scrape off the condensate on the surface of the tin liquid in the evaporation plates.

[0006] Preferably, the multi-stage vacuum distillation unit also includes a feed pipe, a discharge pipe and a connecting column, the connecting column is arranged vertically and the lower end is connected to the driving shaft of the rotating mechanism, and the upper end is fixedly connected to the center of each stage of the evaporation disk in sequence, and the center of each stage of the condensation disk is provided with a center hole, and the center hole cooperates with the connecting column movably set, the connecting column is located above the last stage of the evaporation disk and the part of the connecting shaft located between adjacent evaporation disks is provided with a lateral connecting hole, the feed pipe is fixedly set on the top of the furnace body, and the end thereof located inside the furnace body is set as a telescopic structure and is connected to the first stage condensation disk, the discharge pipe is fixedly set on the lower part of the side wall of the furnace body, and a receiving groove is provided directly below the lower port of the condensation tube, and the receiving groove is connected to the end of the discharge pipe located inside the furnace body.

[0007] 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; The first distillation unit includes a first evaporation pan group and a first rotating mechanism, the first rotating mechanism is drivingly connected to the connecting column of the first evaporation pan group, the second distillation unit includes a second evaporation pan group and a second rotating mechanism, the second rotating mechanism is drivingly connected to the connecting column of the second evaporation pan group, the control unit is connected to the first rotating mechanism and the second rotating mechanism via electrical signals, and is configured to drive the first evaporation pan group and the second evaporation pan group to rotate alternately.

[0008] Preferably, the first distillation unit further comprises a first condensation plate group, a first cold precipitate tube and a first lifting mechanism, the first lifting mechanism is drivingly connected to the first-stage condensation plate of the first condensation plate group, and the condensation plates of each stage of the first condensation plate group are connected as a whole through a first cold precipitate tube arranged on one side, the second distillation unit further comprises a second condensation plate group, a second cold precipitate tube and a second lifting mechanism, the second lifting mechanism is drivingly connected to the first-stage condensation plate of the second condensation plate group, and the condensation plates of each stage of the second condensation plate group are connected as a whole through a second cold precipitate tube arranged on one side, the control unit is connected to the first lifting mechanism and the second lifting mechanism with electrical signals, and is configured to drive the first condensation plate group and the second condensation plate group to rise and fall alternately.

[0009] Preferably, a first graphite heating body is arranged under the last evaporation pan of the first evaporation pan group, and a second graphite heating body is arranged under the last evaporation pan of the second evaporation pan group. The control unit is connected to the first graphite heating body and the second graphite heating body by electrical signals, 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.

[0010] Preferably, the vacuum distillation furnace also includes a condensate brushing removal unit, which 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 the brush bodies is consistent with the number of scrapers and the heights correspond one to one, and each brush body is located on the horizontal moving path of the corresponding scraper.

[0011] Preferably, the rotating shaft is arranged on the middle front side of the first distillation unit and the second distillation unit, the supporting rod is arranged on the middle rear side of the first distillation unit and the second distillation unit, and the swing mechanism drives the rotating shaft to swing back and forth between the two distillation units to drive the scraper to swing alternately to the surface of the first evaporation plate group or the second evaporation plate group to scrape off the condensate on the surface of the tin liquid.

[0012] Preferably, the brush body comprises an upper brush plate and a lower brush plate symmetrically arranged up and down and bristles provided on opposite surfaces of the two brush plates, and the scraper moves horizontally through the upper and lower brush plates to laterally brush away the condensate on the scraper surface.

[0013] Preferably, the upper brush plate and the lower brush plate are arranged to gradually increase in width from the rotation axis to the support rod.

[0014] Preferably, the condensate brushing unit also 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 and is arranged along the direction of the line between the support rod and the rotating shaft. The bottom of the support rod is slidably set in the longitudinal guide rail. The reciprocating mechanism is connected to the support rod driving and is electrically connected to the control unit by signal. By driving the support rod, each brush body is driven to reciprocate along the longitudinal guide rail to longitudinally brush off the condensate on the scraper surface.

[0015] Compared with the prior art, the technical solution of the present invention has at least the following advantages: 1. The present invention provides a multi-stage evaporation plate group and a multi-stage condensation plate in an open and close configuration for each distillation unit, which are controlled by a control unit to achieve efficient distillation of tin liquid and coordinated operation of scraping off condensates; specifically, when the condensation plate and the evaporation plate are engaged, the scraper leaves, and the graphite heating body heats the multi-stage evaporation plate at the same time to achieve efficient distillation; after a period of distillation, the condensation plate is controlled to be lifted and separated from the evaporation plate, and the scraper moves horizontally to above the evaporation plate, and cooperates with the evaporation plate to rotate circumferentially to complete the scraping operation of condensates on the surface of the tin liquid in the evaporation plate, which not only avoids the continuous accumulation of condensates that affects the distillation efficiency, but also does not need to open the furnace body of the vacuum distillation furnace for a long time. The entire scraping operation is simple and efficient, ensuring the efficiency of the distillation operation.

[0016] 2. The present invention arranges a first distillation unit and a second distillation unit arranged side by side in the distillation furnace, and arranges the rotating shaft of the condensate scraping unit on one side in the middle of the two distillation units. By controlling the scraper to move back and forth between the two distillation units and the condensation plate groups of the two distillation units to alternately rise and fall, the evaporation plate groups to alternately rotate, and the graphite heating bodies to alternately heat, it is possible to ensure that when one of the distillation units is performing the condensate scraping operation, the other distillation units can continue to perform the distillation operation, thereby achieving a reasonable combination of heating distillation and condensate scraping, and further improving the efficiency of the distillation operation.

[0017] 3. The present invention is equipped with a condensate brushing unit in conjunction with the condensate scraping unit. By arranging a brush body that is consistent with the height of each scraper and is located on the horizontal moving path of the corresponding scraper, timely removal of condensate on the scraper surface is achieved. Further, upper and lower brush plates and bristles, longitudinal guide rails and reciprocating mechanisms are arranged to achieve comprehensive cleaning of the scraper surface from two vertical directions, so that the scraper moves to the next evaporation disk surface in a clean state, avoiding condensate adhered to the scraper surface from entering the evaporation disk and causing secondary pollution, thereby better achieving the effect of scraping off condensate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1Schematic diagram of the external structure of the vacuum distillation furnace of Example 1 of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of the medium vacuum distillation furnace after removing part of the shell; Figure 3 yes Figure 2 A front view of Figure 4 yes Figure 2 A partial enlarged view of point A in the middle; Figure 5 yes Figure 1 Bottom view of the medium vacuum distillation furnace; Figure 6 yes Figure 2 A schematic diagram of the structure of the first evaporation pan group; Figure 7 yes Figure 2 A schematic diagram of the structure of the first condensation tray group; Figure 8 is a schematic diagram of the structure when the first evaporation pan group and the first condensation pan group are assembled; Fig. 9 yes Figure 2 The structural schematic diagram of the condensate scraping unit; Fig.10 yes Figure 2 Schematic diagram of the structure of the medium condensate brushing unit; Fig.11 It is a schematic diagram of the structure when the bristles are used to remove the condensate on the scraper; Fig.12 It is a schematic diagram of the structure when the scraper scrapes away the condensate on the evaporating plate group.

[0019] Description of the accompanying drawings: 1-furnace body; 2-first distillation unit, 21-first evaporation pan group, 22-first connecting column, 23-first lateral connecting hole, 24-first condensation pan group, 25-first condensation tube, 26-first graphite heating body, 27-first rotating mechanism, 28-first lifting mechanism, 29-first discharge pipe, 210-first receiving tank, 211-first feed pipe; 3-second distillation unit, 31-second evaporation pan group, 32-second condensation pan group, 33-second condensation tube, 34-second graphite heating body, 35-second rotating mechanism, 36-second lifting mechanism; 4- condensate scraping unit, 41- rotating shaft, 42- scraper, 43- swing mechanism; 5-condensate brushing unit, 51-support rod, 52-upper brush plate, 53-brush hairs, 54-lower brush plate, 55-longitudinal guide rail, 56-reciprocating mechanism. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 is by no means intended to limit the present invention and its application or use. 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.

[0021] The invention provides a vacuum distillation furnace of a high-tin material recovery system, comprising a multi-stage vacuum distillation unit, a condensate scraping unit and a control unit.

[0022] The multi-stage vacuum distillation unit includes an evaporation pan group, a condensation pan group and a condensation precipitate tube. The evaporation pan group includes a plurality of evaporation pans arranged vertically at intervals and with outer diameters increasing step by step from top to bottom. The condensation pan group includes a plurality of condensation pans that are 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.

[0023] The condensate scraping unit includes a rotating shaft, a scraper and a swing mechanism. The rotating shaft is arranged vertically and can rotate around a central axis. The number of the scrapers is consistent with the number of vacuum distillation stages and they are arranged vertically at intervals on the same side of the rotating shaft. The lower surface of each scraper is flush with the upper surface of each stage of the evaporation disk, and the swing mechanism is drivingly connected to the rotating shaft.

[0024] The control unit is connected to the rotating mechanism, the lifting mechanism, and the swinging mechanism by electrical signals, and is configured to control the lifting mechanism to drive the condensation plates at various levels to be synchronously lifted and separated from the evaporation plates, control the rotating mechanism to drive the evaporation plates at various levels to rotate synchronously, and control the swinging mechanism to drive the scrapers to synchronously move horizontally toward the surface of the evaporation plates at various levels, so as to scrape off the condensate on the surface of the tin liquid in the evaporation plates.

[0025] Example 1 This embodiment provides a specific scheme for the vacuum distillation furnace of the high tin material recovery system of the present invention, such as Figure 1-Figure 12 As shown, in this embodiment, 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.

[0026] The first distillation unit 2 includes a first evaporation pan group 21, a first connecting column 22, a first condensation pan group 24, a first condensation tube 25, a first graphite heating body 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.

[0027] The first evaporation pan group 21 includes a plurality of evaporation pans arranged at intervals along the vertical direction and whose outer diameters increase step by step from top to bottom. The first condensation pan group 24 includes a plurality of condensation pans arranged at intervals along the vertical direction and whose outer diameters increase step by step from top to bottom. Each condensation pan is respectively and one by one correspondingly buckled and arranged on each evaporation pan. The first condensation precipitation tube 25 is arranged vertically on one side of the first condensation pan group 24 and is connected with each condensation pan of each stage in sequence 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, and its lower end is connected to the driving shaft of the first rotating mechanism 27, and its upper end is fixedly connected to the center of each evaporation pan of each stage in sequence. A center hole is provided at the center of each condensation pan, and the center hole is movably matched with the first connecting column 22. The first connecting column 22 is located in a partially hollow arrangement above the last evaporation pan, so as to allow the tin liquid to be distilled to flow into the evaporation pans of each stage in sequence. The first connecting column 22 is located in a partially hollow arrangement between adjacent evaporation pans. The first lateral connecting holes 23 are respectively provided, and the lowest point of each first lateral connecting hole 23 is in accordance with the height of the upper opening edge of the evaporation plate below; 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 plate of the first condensation plate group 24; the condensation plates of each stage are connected as a whole through the first condensation precipitation tube 25 arranged on the same side; the first graphite heating body 26 is arranged below the last-stage evaporation plate of the first evaporation plate group 21, and is used for heating and distilling the tin liquid in the entire first evaporation plate group 21; the first feeding pipe 211 is fixedly provided at the top of the furnace body 1, and one end thereof located inside the furnace body 1 is provided with a telescopic structure and is connected with the first-stage condensation plate; the first discharging pipe 29 is fixedly provided at the lower part of the side wall of the furnace body; a first receiving groove 210 is provided directly below the lower port of the first condensation precipitation tube 25, and the first receiving groove 210 is connected with one end of the first discharging pipe 29 located inside the furnace body 1.

[0028] Since the structures of the two distillation units are the same, the second distillation unit 3 includes the corresponding second evaporation pan group 31, the second connecting column, the second condensation pan group 32, the second condensation precipitate tube 33, the second graphite heating body 34, the second rotating mechanism 35, the second lifting mechanism 36, the second discharge pipe, the second receiving tank and the second feed pipe, and the positions and connection relationships between the various structural parts are completely consistent with the above description of the second distillation unit 2. It should be noted that the second connecting column, the second discharge pipe, the second receiving tank and the second feed pipe are not marked in the drawings.

[0029] In this embodiment, the first evaporation pan group 21 and the first condensation pan group 24 are both configured as three-stage pan groups, with the first stage and the last stage both being arranged in order from top to bottom.

[0030] This embodiment arranges the part of the feed pipe inside the furnace body as a telescopic structure, and arranges a condensation tube and a receiving tank that are opposite to each other and not connected, thereby ensuring that the condensation plate can be freely raised and lowered without affecting the feeding and discharging functions.

[0031] like Fig. 9 The condensate scraping unit 4 includes a rotating shaft 41, a scraper 42 and a swing mechanism 43. The rotating shaft 41 is arranged vertically and can rotate around the central axis. Multiple scrapers 42 are arranged at intervals along the vertical direction on the same side of the rotating shaft. The lower surface of each scraper is flush with the upper surface of each stage of the evaporation plate. The swing mechanism 43 is set at the bottom of the furnace body 1 and is drivingly connected to the bottom of the rotating shaft 41.

[0032] The vacuum distillation furnace of this embodiment also includes a condensate brushing removal unit 5, which includes a support rod 51 and a brush body. The support rod 51 is arranged vertically, and a plurality of brush bodies whose number is the same as the scraper 42 are arranged vertically at intervals on one side of the support rod 51 relative to the rotating shaft 41, and the height of each brush body corresponds to that of each scraper, and each brush body is located on the horizontal moving path of the corresponding scraper.

[0033] In this embodiment, the number of the scraper 42 and the number of the brush bodies are both three.

[0034] In this embodiment, the brush body includes 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 laterally brush away the condensate on the surface of the scraper 42.

[0035] In this embodiment, the condensate brushing unit 5 also 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 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 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 brush off the condensate on the surface of the scraper 42.

[0036] The control unit is connected to the first rotating mechanism 27 and the second rotating mechanism 35 by electrical signals, and is configured to drive the first evaporation pan group 21 and the second evaporation pan group 31 to rotate alternately; the control unit is connected to the first lifting mechanism 28 and the second lifting mechanism 36 by electrical signals, and is configured to drive the first condensation pan group 24 and the second condensation pan group 32 to rise and fall alternately; the control unit is connected to the first graphite heating body 26 and the second graphite heating body 34 by electrical signals, and is configured to control the corresponding graphite heating body to stop heating when the condensation pan group in a certain distillation unit rises and leaves the evaporation pan group; the control unit is connected to the reciprocating mechanism 56 by electrical signals; the control unit is connected to the swing mechanism 43 by electrical signals, and is configured to drive the rotating shaft 41 to drive each scraper to move horizontally toward the distillation unit where heating is stopped.

[0037] In order to achieve a reasonable combination of the distillation process and the condensate scraping process, further save the space in the furnace and improve the distillation operation efficiency, in this embodiment, the rotating shaft 41 is arranged on the middle front side of the first distillation unit 2 and the second distillation unit 3, and the support rod 51 is arranged on the middle rear side of the first distillation unit 2 and the second distillation unit 3. The swing mechanism 43 drives the rotating shaft 41 to swing back and forth between the two distillation units, so as to drive the scraper 42 to swing alternately to the surface of the first evaporation plate group 21 or the second evaporation plate group 31 to scrape off the condensate on the surface of the tin liquid.

[0038] In this embodiment, since the path of the scraper 42 when it swings is fan-shaped, in order to maximize the removal of condensate on the scraper 42, the upper brush plate 52 and the lower brush plate 54 are arranged to gradually increase in width from the rotating shaft 41 to the support rod 51, so as to extend the contact time between the bristles 53 and the scraper 42. Specifically, a fan ring or a trapezoidal shape can be used.

[0039] The working process of the above vacuum distillation furnace is as follows: 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 tin material containing lead impurities is heated and melted, it is transported to the top evaporation plate of the evaporation plate group through the feed pipe and flows into the evaporation plates below in sequence. The evaporation plates at each level are distilled respectively, and the metal vapor is collected into the condensation precipitation tube through the corresponding condensation plates at each level, and finally output from the receiving tank and the discharge pipe in sequence.

[0040] After a period of distillation, 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, and the swing mechanism 43 drives the rotating shaft 41 to rotate and drives each scraper 42 to move horizontally above each level of evaporation plate to scrape off the condensate on the surface of the tin liquid in the evaporation plate.

[0041] After the scraping operation of the condensate in the first distillation unit 2 is completed, the swing mechanism 43 drives the rotating shaft 41 to rotate in the opposite direction, driving the scrapers 42 to move horizontally above the evaporation plates of each level of the second distillation unit 3, and controls the first evaporation plate group 21 to stop rotating. The first condensation plate group 24 descends and fits tightly with the first evaporation plate group 21. The first graphite heating body 26 starts to heat. At this time, the first distillation unit 2 continues to perform 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.

[0042] When the swing mechanism 43 drives 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 laterally relative to the upper and lower brush plates, the upper and lower brush plates also move longitudinally relative to the scraper 42, thereby cleaning the scraper 42 to the greatest extent.

[0043] The above process is carried out alternately to scrape off 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, so that one of the distillation units is always kept in a distillation operation state, effectively improving the distillation efficiency of the entire vacuum distillation furnace.

[0044] 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 are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of 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 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 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 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), the first rotating mechanism (27) being drivingly connected to a connecting column of the first evaporation pan group (21), the second distillation unit (3) comprising a second evaporation pan group (31) and a second rotating mechanism (35), the second rotating mechanism (35) being drivingly connected to a connecting column of the second evaporation pan group (31), the control unit being connected to both the first rotating mechanism (27) and the second rotating mechanism (35) via electrical signals, and being configured to drive the first evaporation pan group (21) and the second evaporation pan 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 middle front side between the first distillation unit (2) and the second distillation unit (3), the supporting 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 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.

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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