A continuous crystal precipitation purification system for high purity aluminum

Abstract

The application discloses a high-purity aluminum continuous crystallization purification system, which comprises a crystallization furnace, a double-chamber furnace, a crystallization device and a rotary lifting device, the crystallization furnace is used for containing aluminum liquid and provides a crystallization place; the rotary lifting device is connected with the crystallization device and is used for inserting the crystallization device into the crystallization furnace to obtain a crystallization ingot through crystallization and transferring the crystallization ingot to the double-chamber furnace; and the double-chamber furnace is used for receiving the crystallization ingot and melting the crystallization ingot. The system has high production efficiency, high controllability and good stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal purification, and particularly relates to a high-purity aluminum continuous crystallization purification system. BACKGROUND

[0002] The crystallization method is also called the rotating segregation technology, and has the advantages of low energy consumption and low cost, and is widely used in developed countries, especially in Japan. In China, the rotating segregation technology is still in the initial stage, and the segregation method is mainly the directional solidification method.

[0003] The high-purity aluminum crystallization purification is a process method for preparing high-purity aluminum by utilizing the segregation characteristics of impurity elements in the process of the transformation of aluminum liquid from liquid to solid. The segregation refers to the phenomenon that the composition of solid alloy or metal is different from the original liquid composition in the solidification process of alloy or pure metal. Generally, the content of trace impurity elements in the solidified crystal is much lower than that of the original aluminum liquid.

[0004] At present, the high-purity aluminum crystallization purification device generally has the problems of low production efficiency, poor process controllability, poor stability, insufficient batch continuous production operation capacity, and low automation level. SUMMARY

[0005] The application aims to solve the above problems in the prior art, and provides a high-purity aluminum continuous crystallization purification system, which has high production efficiency, high process controllability, and good stability.

[0006] The technical scheme for solving the above technical problems is as follows:

[0007] A high-purity aluminum continuous crystallization purification system comprises a crystallization furnace, a double-chamber furnace, a crystallization device, and a rotating lifting device. The crystallization furnace is used for containing aluminum liquid and provides a crystallization place. The rotating lifting device is connected with the crystallization device, and is used for inserting the crystallization device into the crystallization furnace to obtain a crystallization ingot by crystallization, and transferring the crystallization ingot to the double-chamber furnace. The double-chamber furnace is used for receiving the crystallization ingot and melting the crystallization ingot.

[0008] Preferably, the crystallization furnace comprises a first furnace body, a first furnace cover, and an electromagnetic stirrer. The first furnace cover is arranged on the first furnace body through a support beam suspension cover. The support beam is connected with the rotating lifting device. The electromagnetic stirrer is arranged at the bottom of the first furnace body.

[0009] The crystallization device comprises a crystallization shaft, a quick-mount clamping mechanism, and a crystallization rotating mechanism, the top end of the crystallization shaft is connected with the crystallization rotating mechanism through the quick-mount clamping mechanism, the crystallization rotating mechanism is arranged on the rotating lifting device, the bottom end of the crystallization shaft penetrates through the first furnace cover and extends into the first furnace body, and the crystallization rotating mechanism is used to drive the crystallization shaft to rotate, and the rotating direction of the crystallization shaft is opposite to the stirring direction of the electromagnetic stirrer.

[0010] Preferably, the crystallization rotating mechanism comprises a rotating main shaft and a quick-mount shaft, the quick-mount clamping mechanism comprises a clamping locking mechanism and a quick-mount clamping jaw, the rotating main shaft is installed on the rotating lifting device, the top end of the quick-mount shaft penetrates through the support beam and is connected with the rotating main shaft, and the quick-mount clamping jaw is installed at the bottom end of the quick-mount shaft through the clamping locking mechanism and is used to connect the crystallization shaft to realize quick mounting.

[0011] Preferably, the crystallization shaft comprises a crystallization shaft seat, a shaft sleeve, a mandrel, and a shaft sleeve sealing cover, the mandrel is arranged in the crystallization shaft seat, the top of the mandrel is provided with a quick-mount joint, and the quick-mount joint is matched with the quick-mount clamping jaw.

[0012] The shaft sleeve is sleeved on the mandrel and is below the crystallization shaft seat, and the shaft sleeve sealing cover is sealed on the bottom end of the shaft sleeve.

[0013] Preferably, the crystallization device further comprises a cooling mechanism, the rotating main shaft and the quick-mount shaft are provided with a first air inlet channel, the cooling mechanism is communicated with the first air inlet channel and is used to introduce cooling gas.

[0014] The mandrel is provided with a second air inlet channel, the second air inlet channel is communicated with the first air inlet channel, the mandrel is provided with a loop through hole, a cooling channel is arranged between the mandrel and the shaft sleeve, and the crystallization shaft seat is provided with an exhaust channel.

[0015] Preferably, the cooling mechanism comprises an eddy current refrigerator, a temperature control valve, and a flow valve, the air outlet of the eddy current refrigerator is communicated with the first air inlet channel, and the air inlet of the eddy current refrigerator is provided with the temperature control valve and the flow valve.

[0016] Preferably, the mandrel is provided with a heat dissipation fin, and the heat dissipation fin is spirally arranged along the length direction of the mandrel.

[0017] Preferably, the shaft sleeve comprises a high-temperature-resistant non-stick aluminum shaft sleeve and a high-purity graphite shaft sleeve, the high-temperature-resistant non-stick aluminum shaft sleeve is butt-jointed with the high-purity graphite shaft sleeve, the high-temperature-resistant non-stick aluminum shaft sleeve is located at one end close to the bottom end of the mandrel, and the high-purity graphite shaft sleeve is located at one end close to the top end of the mandrel.

[0018] Preferably, the shaft sleeve is conical, and the taper is 0.5-5°.

[0019] Preferably, the first furnace body comprises a crystallization crucible and a crucible heater, the crucible heater is arranged outside the crystallization crucible, and the electromagnetic stirrer is arranged at the bottom of the crystallization crucible.

[0020] The first furnace cover is matched with the crystallization crucible, and the first furnace cover is provided with a protective gas inlet for introducing the protective gas.

[0021] Preferably, the first furnace cover is embedded with a first heater, and the first heater is used for heating and keeping warm the introduced protective gas.

[0022] Preferably, the double-chamber furnace comprises an aluminum melting furnace and a static furnace, the aluminum melting furnace comprises a second furnace body, a second furnace cover, a second heater and a first stopper, and the static furnace comprises a third furnace body, a third furnace cover, a third heater, a second stopper, a third stopper and a pump, wherein:

[0023] The second furnace cover is arranged on the second furnace body, the second furnace cover is provided with an opening matched with the crystallization shaft seat, so that the crystallization shaft with the crystallization ingot is suspended in the second furnace body, the second heater is connected with the second furnace body and used for heating and melting the crystallization ingot in the second furnace body, the second furnace body is communicated with the third furnace body through a first channel, so as to introduce the molten aluminum liquid into the third furnace body, and the first stopper is used for controlling the opening and closing of the first channel.

[0024] The third furnace cover is arranged on the third furnace body, the third heater is connected with the third furnace body and used for heating and keeping warm the aluminum liquid in the third furnace body, the furnace body is further communicated with the second furnace body through a second channel, the pump is arranged at the second channel and used for pumping the aluminum liquid in the third furnace body back to the second furnace body, the second stopper is used for controlling the opening and closing of the second channel, and the third furnace body is further provided with an aluminum outlet, and the third stopper is arranged on the aluminum outlet and used for controlling the opening and closing of the aluminum outlet.

[0025] Preferably, the second heater comprises a first radiation heater, a first immersion heater and a second immersion heater, the first radiation heater and the second immersion heater are arranged transversely in the second furnace body, and the first immersion heater passes through the second furnace cover and is suspended in the second furnace body.

[0026] The third heater comprises a second radiation heater and a third immersion heater, and the second radiation heater and the third immersion heater are arranged transversely in the third furnace body.

[0027] Compared with the prior art, the high-purity aluminum continuous crystallization purification system has the advantages that

[0028] Effects are as follows:

[0029] By setting the rotary lifting device cooperates with the crystallization device, the high-purity aluminum crystallization, melting to melting casting preparation full flow automation control and continuous operation can be realized, the controllability and efficiency rhythm of process are significantly improved, and the production efficiency is improved;

[0030] By setting the quick mounting and clamping mechanism, the installation and replacement of the crystallization shaft can be realized;

[0031] By setting the electromagnetic stirrer and the crystallization rotating mechanism, the aluminum-containing liquid can be stirred synchronously and at the same speed in the reverse direction, the relative linear velocity of the aluminum-containing liquid and the crystallization shaft is increased, so that the diffusion of impurity elements from the solid-liquid phase interface front to the liquid phase in the crystallization process is more effectively promoted, and further diffusion to the vicinity of the crucible wall under the action of centrifugal force is promoted, and the crystallization purification effect is significantly improved;

[0032] By setting the vortex refrigeration device and the heat dissipation fin, the temperature gradient and the cooling capacity can be greatly expanded, the controllability of the crystallization rate and the crystallization purity can be effectively improved, and the batch stability of the crystallization efficiency and the crystallization purity can be significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structure schematic view of the high-purity aluminum continuous crystallization purification system in the embodiment of the application;

[0034] Figure 2 It is a structure schematic view of the crystallization device (when the quick mounting and clamping mechanism locks the crystallization shaft) in the embodiment of the application;

[0035] Figure 3 It is a structure schematic view of the crystallization device (when the quick mounting and clamping mechanism releases the crystallization shaft) in the embodiment of the application.

[0036] In the figure: 1. crystallization furnace; 2. double chamber furnace; 3. rotary lifting device; 4. crystallization device; 5. base; 6. column rotating mechanism; 6-1. column rotating motor; 7. cantilever lifting mechanism; 7-1. cantilever lifting motor; 8. column; 8-1. upper limit; 8-2. lower limit; 9. cantilever; 10. crystallization rotating mechanism; 10-1. crystallization rotating motor; 11. second boom; 12. crystallization crucible; 13. crucible heater; 14. electromagnetic stirrer; 15. aluminum-containing liquid; 16. crystallization ingot; 17. eddy current refrigerator; 17-1. flow valve; 17-2. temperature valve; 17-3. air inlet; 18. rotary joint; 19. rotary main shaft; 19-1. first air inlet channel; 20. heat insulation gasket; 21. quick mounting shaft; 22. quick mounting clamping mechanism; 22-1. clamping locking mechanism; 22-2. quick mounting clamping jaw; 22-3. convex sealing ring; 23. support beam; 23-1. lifting hole; 23-2. quick mounting shaft through hole; 24. first boom; 24-1. one-side locking movable pin; 24-2. double-side locking fixed pin; 25. first furnace cover; 26. first heater; 27. quick mounting joint; 27-1. concave sealing groove; 28. crystallization shaft seat; 28-1. shaft seat flange; 29. shaft sleeve; 29-1. high-temperature-resistant non-stick aluminum shaft sleeve; 29-2. high-purity graphite shaft sleeve; 30. mandrel; 31. loop through hole; 32. heat dissipation fin; 33. plug; 34. shaft sleeve sealing cover; 35. exhaust passage; 36. second air inlet channel; 37. cooling channel; 38. aluminum melting furnace; 39. standing furnace; 40. second furnace body; 41. third furnace cover; 42. second furnace cover; 42-1. air cylinder; 43. fixed support mechanism; 43-1. movable support adapting mechanism; 44. first immersion heater; 45. first plug rod; 46. second plug rod; 47. third plug rod; 48. first radiant heater; 49. second immersion heater; 50. second radiant heater; 51. third immersion heater; 52. crystallization shaft; 53. pump; 54. aluminum outlet; 55- first channel; 56- second channel; 57- furnace wall. DETAILED DESCRIPTION

[0037] In order to better understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0038] In the description of this invention, it should be noted that the terms "above" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example 1

[0042] like Figure 1 As shown, this embodiment discloses a high-purity aluminum continuous crystallization purification system, including a crystallization furnace 1, a double-chamber furnace 2, a crystallization device 4, and a rotary lifting device 3, wherein:

[0043] The crystallization furnace 1 is used to hold aluminum-containing liquid 15, providing a crystallization site for the aluminum-containing liquid to obtain crystallized ingots;

[0044] The rotary lifting device 3 is connected to the crystallization device 4 and is used to insert the crystallization device 4 into the crystallization furnace 1 to crystallize and obtain crystallization ingot 16, and to transfer the crystallization ingot 16 to the double chamber furnace 2.

[0045] The dual-chamber furnace 2 is used to receive the crystallized ingot 16 and melt it.

[0046] Specifically, the rotary lifting device 3 comprises a base 5, a column 8, a column rotating mechanism 6, a column rotating motor 6-1, a cantilever 9, a cantilever lifting mechanism 7, and a cantilever lifting motor 7-1. The bottom end of the column 8 is arranged on the base 5, one end of the cantilever 9 is connected with the column 8, and the crystallization device 4 is arranged on the other end of the cantilever 9. The column rotating mechanism 6 is connected with the column 8, the column rotating motor 6-1 is connected with the column rotating mechanism 6, the column rotating motor 6-1 drives the column rotating mechanism 6 to drive the column 8 to rotate, thereby driving the crystallization device 4 to rotate to the position of the crystallization furnace 1 or the double-chamber furnace 2, and realizing the switching of the equal-radius position transfer. The cantilever 9 is connected with the column 8 through the cantilever lifting mechanism 7, the cantilever lifting motor 7-1 is arranged at the top end of the column 8 and connected with the cantilever lifting mechanism 7, the cantilever lifting motor 7-1 drives the cantilever lifting mechanism 7 to drive the cantilever 9 to lift on the column 8, so as to adjust the position height of the crystallization device 4.

[0047] More specifically, the column 8 is further provided with a limiting component. The limiting component specifically comprises an upper limiting part 8-1 and a lower limiting part 8-2. The upper limiting part 8-1 is arranged at the limit position of the upward movement of the cantilever 9, and the lower limiting part 8-2 is arranged at the limit position of the downward movement of the cantilever 9, thereby playing a protective role of preventing the cantilever 9 from being separated from the column 8 and avoiding the bottom of the crystallization device 4 from colliding with the bottom of the crystallization furnace 1.

[0048] In this embodiment, the column rotating motor 6-1 adopts a first servo motor and a first speed reducer to control the rotation angle; and the cantilever lifting motor 7-1 adopts a second servo motor and a second speed reducer to control the lifting height.

[0049] In some embodiments, the crystallization furnace 1 comprises a first furnace body, a first furnace cover 25, and an electromagnetic stirrer 14.

[0050] Specifically, the first furnace cover 25 is connected with the support beam 23 located directly above the first furnace cover 25 through the first hanger rod 24, so that the first furnace cover 25 is suspended on the first furnace body. The support beam 23 is provided with a hanger hole 23-1, the second hanger rod 11 is arranged in the hanger hole 23-1, and the support beam 23 is connected with the cantilever 9 in the rotary lifting device 3 through the second hanger rod 11. The electromagnetic stirrer 14 is arranged at the bottom of the first furnace body.

[0051] In this embodiment, the first hanger rod 24 and the first furnace cover 25 are connected and fixed by using a double-sided locking fixing pin 24-2, and the first hanger rod 24 and the support beam 23 are connected and fixed by using a single-sided locking movable pin 24-1.

[0052] In some embodiments, as shown in Figure 2 , Figure 3 The crystallization device 4 comprises a crystallization shaft 52, a quick-mounting clamping mechanism 22, and a crystallization rotating mechanism 10.

[0053] Specifically, the top end of the crystallization shaft 52 is connected to the crystallization rotating mechanism 10 through the quick-assembly clamping mechanism 22, the crystallization rotating mechanism 10 is arranged on the cantilever 9 in the rotating lifting device 3, the bottom end of the crystallization shaft 52 extends into the first furnace body of the crystallization furnace 1 through the first furnace cover 25 of the crystallization furnace 1, the crystallization rotating mechanism 10 is connected to the crystallization rotating motor 10-1, the crystallization rotating motor 10-1 can be arranged on the cantilever 9, the crystallization rotating mechanism 10 is used to drive the crystallization shaft 52 to rotate synchronously under the driving of the crystallization rotating motor 10-1, the rotating speed is preferably 0-500 r / min, which can be adjusted arbitrarily according to actual conditions, the rotating direction of the crystallization shaft 52 is opposite to the stirring direction of the electromagnetic stirrer 14, that is, the rotating direction of the crystallization shaft 52 is opposite to the direction in which the electromagnetic stirrer 14 drives the aluminum-containing liquid to move. Moreover, the movement speed of the aluminum-containing liquid is preferably equal to the linear speed of the crystallization shaft 52 at the same radius, so that the aluminum-containing liquid in the crystallization furnace 1 is synchronously, rapidly and reversely stirred, the relative linear speed of the aluminum-containing liquid and the crystallization shaft 52 is increased, the impurity elements in the aluminum-containing liquid are more effectively promoted to diffuse from the front of the solid-liquid phase interface to the liquid phase in the crystallization process, and further diffuse to the vicinity of the inner wall of the crystallization furnace 1 under the action of the centrifugal force, thereby significantly improving the crystallization purification effect.

[0054] More specifically, the first furnace body includes the crystallization crucible 12 and the crucible heater 13, the crucible heater 13 is arranged outside the crystallization crucible 12 and surrounds the crystallization crucible 12 in the circumferential direction, and the electromagnetic stirrer 14 is located at the bottom of the crystallization crucible 12. The first furnace cover 25 is matched with the crystallization crucible 12, and the first furnace cover 5 is provided with a protective gas inlet for introducing protective gas into the crystallization crucible 12 to prevent and slow down the oxidation of the surface of the aluminum-containing liquid.

[0055] In this embodiment, the first furnace cover 25 is embedded with the first heater 26, which is preferably any commercially available heat radiation heater with temperature measurement and control functions, for heating and keeping warm the introduced protective gas, so that the temperature of the protective gas above the aluminum-containing liquid in the crystallization crucible 12 is controlled at 10±3 ℃ above the liquidus temperature of the aluminum liquid.

[0056] In this embodiment, the protective gas can be argon or nitrogen or other inert protective gas.

[0057] In some more specific embodiments, as shown in Figure 2 、 3 The crystallization rotating mechanism 10 includes a rotating main shaft 19 and a quick-assembly shaft 21, the quick-assembly clamping mechanism 22 includes a clamping locking mechanism 22-1 and a quick-assembly clamping jaw 22-2,

[0058] Specifically, the rotating main shaft 19 is installed on the cantilever 9 in the rotating lifting device 4, and can rotate under the driving of the crystallization rotating motor 10-1. The top end of the quick mounting shaft 21 penetrates the quick mounting shaft through hole 23-2 in the support beam 23 and is connected with the lower end of the rotating main shaft 19, and rotates together with the rotating main shaft 19. The quick mounting jaw 22-2 is installed at the bottom end of the quick mounting shaft 21 through the clamping locking mechanism 22-1, and is used for connecting the crystallization shaft 52. More specifically, the quick mounting jaw 22-2 clamps the top end of the crystallization shaft 52 and is locked and fixed through the clamping locking mechanism 22-1, so as to realize quick mounting and replacement.

[0059] In the embodiment, the heat insulation sealing pad 20 is arranged between the rotating main shaft 19 and the support beam 23. The top of the rotating main shaft is provided with the rotating joint 18, so as to be connected with the crystallization rotating motor 10-1. The bottom end edge of the quick mounting shaft is outwardly protruded, so as to be mounted with the quick mounting jaw.

[0060] In some more specific embodiments, the crystallization shaft 52 comprises a crystallization shaft seat 28, a shaft sleeve 29, a mandrel 30, and a shaft sleeve sealing cover 34.

[0061] Specifically, the mandrel 30 is penetrated in the crystallization shaft seat 28. The top of the mandrel 30 is provided with the quick mounting joint 27, which is matched with the quick mounting jaw 22-2 to be clamped in the quick mounting jaw 22-2. The bottom end of the mandrel 30 is provided with the plug 33, which is preferably threadedly connected with the mandrel 30 or is integrally designed. The shaft sleeve 29 is sleeved on the mandrel 30 and is below the crystallization shaft seat 28. The shaft sleeve sealing cover 31 is sealed in the through hole on the bottom end of the shaft sleeve 29.

[0062] In the embodiment, the shaft sleeve 29 is a combination of the high-temperature-resistant non-stick aluminum shaft sleeve 29-1 and the high-purity graphite shaft 29-2, that is, the high-temperature-resistant non-stick aluminum shaft sleeve 29-1 and the high-purity graphite shaft 29-2 are connected. The high-temperature-resistant non-stick aluminum shaft sleeve 29-1 is located at one end close to the top end of the mandrel 30, and is preferably threadedly connected with the crystallization shaft seat 8 or is integrally designed. The high-purity graphite shaft 29-2 is located at one end close to the bottom end of the mandrel 30. The shape of the shaft sleeve 29 is preferably conical, and the taper thereof is preferably 0.5-5°, more preferably 1-3° or 1.5-2.5°.

[0063] In the embodiment, the bottom end of the quick mounting shaft 21 is provided with a convex sealing ring 22-3 capable of resisting high temperature, and the top end of the mandrel 30 is provided with a concave sealing groove 27-1 capable of resisting high temperature, and the convex sealing ring 22-3 is matched with the concave sealing groove 27-1. It should be noted that the bottom end of the quick mounting shaft 21 can be provided with a concave sealing groove 27-1 capable of resisting high temperature, and the top end of the mandrel 30 can be provided with a convex sealing ring 22-3 capable of resisting high temperature.

[0064] In some embodiments, the crystallization device 4 further comprises a cooling mechanism, the rotating main shaft 19 and the quick-mounting shaft 21 are provided with a first air inlet channel 19-1, the cooling mechanism is in communication with the first air inlet channel 19-1 and is used for introducing cooling gas; the mandrel 30 is provided with a second air inlet channel 36, the second air inlet channel 36 is in communication with the first air inlet channel 19-1, the mandrel 30 is provided with a loop through hole 31, the mandrel 30 and the shaft sleeve 29 are provided with a cooling channel 37, the loop through hole 31 is in communication with the second air inlet channel 36 and the cooling channel 37, and the crystallization shaft seat 28 is provided with an exhaust channel 35. The cooling gas introduced by the cooling mechanism first enters the first air inlet channel 19-1, then enters the second air inlet channel 36, then enters the cooling channel 37 through the loop through hole 31, and finally is discharged through the exhaust channel 35. The cooling gas flows through the crystallization shaft 52 and cools the shaft sleeve 29, so that the aluminum liquid is crystallized to obtain a crystallized ingot.

[0065] In some more specific embodiments, the cooling mechanism comprises an eddy current refrigerator 17, a temperature control valve 17-1 and a flow valve 17-2, the gas outlet 17-3 of the eddy current refrigerator 17 is in communication with the first air inlet channel 19-1, and the temperature control valve 17-1 and the flow valve 17-2 are arranged on the air inlet 17-3. The gas (preferably compressed gas with a certain pressure) enters the air inlet 17-3 of the eddy current refrigerator 17, and the cooling gas with the required temperature is output at the gas outlet of the eddy current refrigerator 17 after being adjusted by the temperature control valve 17-1 and the flow valve 17-2.

[0066] In this embodiment, the temperature of the gas is preferably adjustable within the range of -45 to 125℃, and the flow of the gas is preferably adjustable within the range of 25 to 4245 L / min. The gas can be inert protective gas such as argon or nitrogen.

[0067] In this embodiment, the cooling mechanism can further comprise an automatic controller (not shown in the figure), which is connected with the temperature control valve 17-1 and the flow valve 17-2 respectively, and has an automatic control program preset therein. The temperature and flow of the cooling gas change linearly with the introduction time of the cooling gas by the automatic control program. Specifically, the automatic controller can be an intelligent terminal device with a man-machine interface. By inputting the temperature and flow parameters of the cooling gas and the crystallization time (i.e. the introduction time) on the man-machine interface, the automatic control program can automatically adjust the temperature control valve 17-1 and the flow valve 17-2, so as to realize dynamic control of the temperature and flow of the cooling gas with the passage of time.

[0068] In some more specific embodiments, the mandrel 30 is provided with a heat dissipation fin 32, and the heat dissipation fin 32 is spirally arranged along the length direction of the mandrel 30, so that the cooling channel 37 is in a spiral shape.

[0069] In some more specific embodiments, the number of exhaust channels 35 is one or more groups, such as six groups. The multiple groups of exhaust channels 35 are centrally and symmetrically distributed along the mandrel 30. The outlet position of the exhaust channels 35 is not lower than 50 mm from the upper cover surface 50 of the first furnace cover 25.

[0070] Compared with the conventional technology, the system of the present embodiment can greatly expand the temperature gradient of the crystallization shaft 52 and the regulation range of the cooling capacity, effectively improve the controllability of the crystallization rate and purity, and significantly improve the batch stability of the crystallization efficiency and purity.

[0071] In some embodiments, the double-chamber furnace 2 comprises an aluminum melting furnace 38 and a static furnace 39, the aluminum melting furnace 38 comprising a second furnace body 40, a second furnace cover 42, a second heater, and a first plug rod 45, and the static furnace 39 comprising a third furnace body, a third furnace cover 41, a third heater, a second plug rod 46, a third plug rod 47, and a pump 53.

[0072] Specifically, the second furnace cover 42 is arranged on the second furnace body 40, and the second furnace cover 42 is provided with an opening matched with the crystallization shaft seat 28, so that the crystallization shaft 52 with the crystallization ingot is suspended in the second furnace body. The second heater is connected with the second furnace body 40 for heating the crystallization ingot 16 melted in the second furnace body 40. The second furnace body 40 is communicated with the third furnace body through a first channel 55 for passing the molten aluminum liquid obtained by melting into the third furnace body, the first plug rod 45 extends into the second furnace body 40 through the second furnace cover 42 to block the inlet of the first channel 55 for controlling the opening and closing of the first channel 55. The third furnace cover 41 is arranged on the third furnace body, and the third heater is connected with the third furnace body for heating and keeping warm the aluminum liquid in the third furnace body. The third furnace body is further communicated with the second furnace body 40 through a second channel 56, the second channel 56 is below the first channel 55, and the pump 53 is arranged on the second channel 56 for pumping the aluminum liquid in the third furnace body back into the second furnace body 40 to accelerate the melting of the crystallization ingot. The second plug rod 46 extends into the third furnace body through the third furnace cover 41 to block the inlet of the second channel 56 for controlling the opening and closing of the second channel 56. The third furnace body is further provided with an aluminum outlet 54, and the third plug rod 47 blocks the aluminum outlet 54 through the third furnace cover 41 for controlling the opening and closing of the aluminum outlet 54.

[0073] In the present embodiment, the first plug rod 45, the second plug rod 46, and the third plug rod 47 are respectively provided with a silicon nitride sheath. The pump 53 is preferably a magnetic pump.

[0074] In actual production process, the molten aluminum in the furnace 38 should be kept at a certain amount and temperature, the amount of molten aluminum should not be less than half of the height of the second furnace hearth, and the temperature of the molten aluminum is preferably 20±3℃ above the liquidus of high-purity aluminum liquid; the molten aluminum in the static furnace 39 should also be kept at a certain amount and temperature, the amount of molten aluminum should not be less than one-third of the height of the third furnace hearth, and the temperature of the molten aluminum is preferably 60±3℃ above the liquidus of high-purity aluminum liquid.

[0075] In some more specific embodiments, as shown in Figure 1 The molten aluminum furnace 38 and the static furnace 39 preferably adopt an integrated structure, that is, the second furnace body 40 and the third furnace body are integrated and separated by the furnace wall 57. The inner lining of the second furnace body 40 and the third furnace body is made of alumina brick.

[0076] In some more specific embodiments, as shown in Figure 1 The second furnace cover 42 is an automatic opening and closing furnace cover, which includes a first cover body, a second cover body, a fixed support mechanism 43, a movable support adaptation mechanism 43-1, and a gas cylinder 42-1. The first cover body is fixedly arranged on the second furnace body 40, the second cover body is connected to the gas cylinder 42-1 through a matched connecting rod mechanism, and the automatic opening and closing of the second furnace cover 42 is realized by driving the second cover body to move through the gas cylinder 42-1. The fixed support mechanism 43 and the movable support adaptation mechanism 43-1 constitute the opening on the second furnace cover 42. Specifically, when the gas cylinder 42-1 drives the second cover body to move towards the first cover body and the second cover body is combined with the first cover body, the second furnace cover 42 is closed; when the gas cylinder 42-1 drives the second cover body to move away from the first cover body, the second cover body is separated from the first cover body, and the second furnace cover is opened. The fixed support mechanism 43 is arranged on the first cover body, the movable support adaptation mechanism 43-1 is arranged on the second cover body, the spindle seat flange 28-1 is arranged on the spindle seat 28, and the spindle seat flange 28-1 is adapted to the fixed support mechanism 43. When the rotating lifting device 3 transfers the crystallization ingot 46 together with the crystallization shaft 52 to the double-chamber furnace 2, the crystallization shaft 52 is supported and suspended on the fixed support mechanism 43 through the spindle seat flange 28-1, and the crystallization shaft is locked through the movable support adaptation mechanism 43-1 cooperating with the fixed support mechanism.

[0077] In some more specific embodiments, as shown in Figure 1 The third furnace cover 41 is an integrated heat preservation furnace cover. Since the molten aluminum furnace 38 and the static furnace 39 are integrated, the integrated heat preservation furnace cover can be further extended to the position of the second cover body, that is, the third furnace cover 41 and the second cover body can be integrated (as shown in Figure 1 ).

[0078] In some more specific embodiments, as shown in Figure 1As shown, the second heater includes a first radiant heater 48, a first immersion heater 44, and a second immersion heater 49.

[0079] Specifically, the first radiant heater 48, the first immersion heater 44, and the second immersion heater 49 are arranged in the second furnace body 40, wherein: the first radiant heater 48 is arranged transversely along the upper side of the wall of the second furnace body 40 for heating the ambient temperature above the liquid surface of the molten aluminum in the molten aluminum furnace 38; the first immersion heater 44 is arranged longitudinally along the wall of the second furnace body 40; and the second immersion heater 49 is arranged transversely along the lower side of the wall of the second furnace body 40 for heating the temperature of the molten aluminum in the molten aluminum furnace 38. Through the above configuration, on the one hand, the temperature of the molten aluminum and the atmosphere temperature above the molten aluminum can be independently controlled to accelerate the melting and stripping efficiency of the segregation ingot, and on the other hand, the heating temperature can be adjusted according to the aluminum melting time to save energy. The number of the first radiant heater 48, the first immersion heater 44, and the second immersion heater 49 is one or more, preferably multiple, and the specific number can be selected according to the actual situation, which will not be described one by one in the embodiment. The first radiant heater 48, the first immersion heater 44, and the second immersion heater 49 are respectively provided with a silicon nitride sheath.

[0080] In some more specific embodiments, as Figure 1 As shown, the third heater includes a second radiant heater 50 and a third immersion heater 51.

[0081] Specifically, the second radiant heater 50 and the third immersion heater 51 are transversely arranged in the third furnace body, wherein: the second radiant heater 50 is arranged transversely along the upper side of the wall of the third furnace body for heating the ambient temperature above the liquid surface of the molten aluminum in the holding furnace 39; and the third immersion heater 51 is arranged transversely along the lower side of the wall of the third furnace body for heating the temperature of the molten aluminum in the holding furnace 39. Through the above configuration, on the one hand, the temperature of the molten aluminum and the atmosphere temperature can be independently controlled, and on the other hand, the casting temperature and the melting temperature of the crystallization ingot can be flexibly adjusted. The number of the second radiant heater 50 and the third immersion heater 51 is one or more, preferably multiple, and the specific number can be selected according to the actual situation, which will not be described one by one in the embodiment. The second radiant heater 50 and the third immersion heater 51 are respectively provided with a silicon nitride sheath.

[0082] In some embodiments, the double-chamber furnace 2 further comprises a temperature control system (not shown in the figure) electrically connected with the first heater (i.e. the first radiant heater 48, the first immersion heater 44, and the second immersion heater 49) and the second heater (the second radiant heater 50 and the third immersion heater 51) respectively, and preset with heating temperature thresholds of each first heater and second heater in the temperature control system (specifically set according to actual process requirements) so as to automatically control the first heater and the second heater to start and stop according to process requirements, thereby controlling the temperature of the molten aluminum in the melting furnace and the holding furnace.

[0083] In this embodiment, the temperature of the molten aluminum in the melting furnace 38 is preferably maintained at 20±3℃ above the liquidus, and the temperature of the molten aluminum in the holding furnace 39 is preferably maintained at 60±3℃ above the liquidus.

[0084] The following provides several sets of examples (see Table 1) to detail the crystallization operation process of the high-purity aluminum continuous crystallization purification system of this embodiment, as follows:

[0085] Table 1 Crystallization operation process parameters

[0086]

[0087] According to the process parameters shown in Table 1, pour the aluminum-containing liquid 15 to be purified into the crystallization crucible 12 in the crystallization furnace 1, and start the crucible heater 13 to heat and control the aluminum-containing liquid 15 to be within the range of 20±1℃ above the liquidus of the aluminum liquid;

[0088] After the preheated crystallization shaft 52 is installed on the cantilever 9 in the rotary lifting device 3 through the quick-mounting clamping mechanism 22, it is transferred and inserted into the aluminum-containing liquid 15 in the crystallization crucible 12 by controlling the column rotating motor 6-1 and the cantilever lifting motor 7-1, and the electromagnetic stirrer 14 and the crystallization rotating mechanism 10 are started to synchronously and at the same speed stir the aluminum-containing liquid 15 in the crystallization crucible 12 in the opposite direction according to the rotating speed in Table 1, while a certain flow and temperature of cooling gas is introduced into the crystallization shaft 52 through the vortex refrigeration device 17 according to Table 1, so as to purify the aluminum liquid by crystallization, and obtain a high-purity crystallization ingot 16 on the shaft sleeve 29 of the crystallization shaft 52, until the preset crystallization time is reached, and the crystallization is completed;

[0089] After the crystallization is completed, the crystallization shaft 52 with the crystallization ingot 16 is taken out from the crystallization crucible 12 by the rotary lifting device 3 and transported into the aluminum melting furnace 38 for melting. During the melting process, the heating temperature thresholds of the first radiation heater 48, the first immersion heater 44 and the second immersion heater 49 are all set to be above the liquidus of the aluminum liquid by 190±5 DEG C. At the same time, the second plug rod 46 on the second channel 56 is removed, the pump 53 is started, and the high-temperature aluminum liquid (the temperature is kept above the liquidus of the aluminum liquid by 60±3 DEG C.) in the static furnace 39 is pumped back to the aluminum melting furnace 38. When the liquid level of the aluminum liquid in the aluminum melting furnace 38 rises to two-thirds of the height of the furnace, the first plug rod 45 on the first channel 55 is removed, and the pump 53 is closed, so that nearly equal amounts of low-temperature aluminum liquid flow back from the aluminum melting furnace 38 to the static furnace 39 through the first channel 55. When the liquid level in the aluminum melting furnace 38 drops to one-half of the height of the furnace, the first plug rod 45 is blocked on the first channel 55, and the pump 53 is started again to realize the circulation of the aluminum liquid. When the temperatures of the aluminum liquid in the aluminum melting furnace 38 and the static furnace 39 tend to be equal, the circulation of the aluminum liquid is stopped, and the crystallization ingot 16 is completely melted and separated from the crystallization shaft 52.

[0090] After the melting is completed, the crystallization shaft 52 is removed from the aluminum melting furnace 38 by the rotary lifting device 3, and after preheating, the crystallization shaft 52 can be transported again and inserted into the aluminum liquid in the crystallization crucible 12 to perform crystallization again.

[0091] When the amount of the aluminum liquid in the static furnace 39 reaches the casting requirement, the third plug rod 47 is removed, and the aluminum liquid flows into the casting system through the aluminum outlet 54 for subsequent processing.

[0092] Compared with the prior art, the high-purity aluminum continuous crystallization purification system of the embodiment can realize automatic control and continuous operation of the whole process from crystallization, melting to melting and casting preparation, significantly improve the controllability and efficiency of the process, and improve the production efficiency. The quick-mounting clamping mechanism can facilitate the installation and replacement of the crystallization shaft. The electromagnetic stirrer and the crystallization rotating mechanism can synchronously and at the same speed rotate in the opposite direction to stir the aluminum liquid, increase the relative linear velocity of the aluminum liquid and the crystallization shaft, and thus more effectively promote the diffusion of impurity elements from the front of the solid-liquid phase interface to the liquid phase in the crystallization process and further diffuse to the vicinity of the crucible wall under the action of the centrifugal force, thereby significantly improving the crystallization purification effect. The vortex refrigeration device and the heat dissipation fins can greatly expand the control range of the temperature gradient and the cooling capacity, effectively improve the controllability of the crystallization rate and the crystallization purity, and significantly improve the batch stability of the crystallization efficiency and the crystallization purity.

[0093] Embodiment 2

[0094] The embodiment discloses a high-purity aluminum continuous crystallization purification system, which is different from the embodiment 1 in that

[0095] The system of the embodiment further comprises a preheating furnace (not shown in the figure) matched with the crystallization shaft 52 in the crystallization device 4, so as to sequentially transfer the crystallization shaft 52 in the crystallization device 4 between the preheating furnace, the crystallization furnace 1, and the melting aluminum furnace 38 in the double-chamber furnace 2 through the rotary lifting device 3, and repeat the circulation.

[0096] Specifically, the crystallization shaft 52 is inserted into the aluminum-containing liquid 15 in the crystallization furnace 1 through the rotary lifting device 3 to obtain the crystallization ingot 16, the crystallization shaft 52 with the crystallization ingot 16 is transferred into the melting aluminum furnace 38 through the rotary lifting device 3, the crystallization ingot 16 is heated and melted, then the crystallization shaft 52 is transferred from the melting aluminum furnace 38 to the preheating furnace through the rotary lifting device 3 for preheating, after that, the crystallization shaft 52 is transferred to the crystallization furnace 1 through the rotary lifting device 3 and inserted into the aluminum-containing liquid 15 in the crystallization furnace 1 again to obtain the crystallization ingot 6 again, and so on, to improve the continuous production efficiency.

[0097] Since the melting time of the crystallization ingot in the melting aluminum furnace is less than the crystallization time of the crystallization ingot, the number of the crystallization shafts is preferably not less than 2. The fast mounting and clamping mechanism matched with the cantilever lifting device realizes the sequential and fast transfer of each crystallization shaft between the preheating furnace, the crystallization furnace, and the melting aluminum furnace 38, and independently completes the corresponding process, which is more conducive to realizing the full-process automatic control and continuous operation and improving the production efficiency compared with the embodiment 1.

[0098] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also regarded as the protection scope of the present application.

Claims

1. A continuous crystallization purification system for high purity aluminum, characterized by, The device comprises a crystallization furnace (1), a double-chamber furnace (2), a crystallization device (4), and a rotary lifting device (3), The crystallization furnace is used for containing aluminum liquid and providing a crystallization site; The rotary lifting device is connected with the crystallization device, and is used for inserting the crystallization device into the crystallization furnace to obtain a crystallization ingot through crystallization, and transferring the crystallization ingot to the double-chamber furnace to realize equal-radius position transfer switching; The double-chamber furnace is used for receiving the crystallization ingot and melting the crystallization ingot; The crystallization furnace comprises a first furnace body, a first furnace cover (25), and an electromagnetic stirrer (14), the first furnace cover is connected with a support beam (23) through a first lifting rod (24) to suspend the first furnace cover on the first furnace body, a lifting hole (23-1) is arranged on the support beam, a second lifting rod (11) is arranged in the lifting hole, the support beam is connected with the rotary lifting device through the second lifting rod, and the electromagnetic stirrer is arranged at the bottom of the first furnace body, The crystallization device comprises a crystallization shaft (52), a quick-mounting clamping mechanism (22), and a crystallization rotating mechanism (10), the top end of the crystallization shaft is connected with the crystallization rotating mechanism through the quick-mounting clamping mechanism, the crystallization rotating mechanism is arranged on the rotary lifting device, the bottom end of the crystallization shaft penetrates into the first furnace body through the first furnace cover, the crystallization rotating mechanism is used for driving the crystallization shaft to rotate, the rotating direction of the crystallization shaft is opposite to the stirring direction of the electromagnetic stirrer, and the movement speed of the aluminum liquid is equal to the equal-radius linear speed of the crystallization shaft, The crystallization rotating mechanism comprises a rotating main shaft (19) and a quick-mounting shaft (21), the quick-mounting clamping mechanism comprises a clamping locking mechanism (22-1) and a quick-mounting clamping jaw (22-2), the rotating main shaft is installed on the rotary lifting device, the top end of the quick-mounting shaft penetrates through the support beam and is connected with the rotating main shaft, and the quick-mounting clamping jaw is installed at the bottom end of the quick-mounting shaft through the clamping locking mechanism and is used for connecting the crystallization shaft to realize quick mounting, The crystallization shaft comprises a crystallization shaft seat (28), a shaft sleeve (29), a mandrel (30), and a shaft sleeve sealing cover (34), the mandrel penetrates into the crystallization shaft seat, the top of the mandrel is provided with a quick-mounting joint, the quick-mounting joint is matched with the quick-mounting clamping jaw, the shaft sleeve is sleeved on the mandrel and is below the crystallization shaft seat, and the shaft sleeve sealing cover is sealed on the bottom end of the shaft sleeve; The double-chamber furnace comprises an aluminum melting furnace (38) and a static furnace (39), the aluminum melting furnace comprises a second furnace body, a second furnace cover (42), a second heater, and a first plugging rod (45), the static furnace comprises a third furnace body, a third furnace cover (41), a third heater, a second plugging rod (46), a third plugging rod (47), and a pump (53), The second furnace cover is arranged on the second furnace body, and an opening is arranged on the second furnace cover, which is matched with the crystallization shaft seat to suspend the crystallization shaft with the crystallization ingot in the second furnace body. The second heater is connected with the second furnace body to heat and melt the crystallization ingot in the second furnace body. The second furnace body is communicated with the third furnace body through a first channel (55) to pass the molten aluminum liquid obtained by melting into the third furnace body. The first plug rod is used to control the opening and closing of the first channel. The third furnace cover is arranged on the third furnace body. The third heater is connected with the third furnace body to heat and keep warm the aluminum liquid in the third furnace body. The third furnace body is further communicated with the second furnace body through a second channel (56) which is below the first channel. The pump is arranged at the second channel to pump the aluminum liquid in the third furnace body back into the second furnace body. The second plug rod is used to control the opening and closing of the second channel. An aluminum outlet (54) is further arranged on the third furnace body. The third plug rod is arranged on the aluminum outlet to control the opening and closing of the aluminum outlet.

2. The high purity aluminum continuous crystallization purification system according to claim 1, characterized by, The crystallization device further comprises a cooling mechanism, The rotating main shaft and the quick-mounting shaft are internally provided with a first air inlet channel (19-1). The cooling mechanism is communicated with the first air inlet channel to pass in cooling gas. The mandrel is internally provided with a second air inlet channel (36) which is communicated with the first air inlet channel. A loop through hole (31) is arranged on the mandrel. A cooling channel (37) is arranged between the mandrel and the shaft sleeve. An exhaust channel (35) is arranged in the crystallization shaft seat.

3. The high purity aluminum continuous crystallization purification system according to claim 2, characterized by, The cooling mechanism comprises an eddy current refrigerator (17), a temperature control valve (17-1) and a flow valve (17-2). The air outlet of the eddy current refrigerator is communicated with the first air inlet channel. The air inlet of the eddy current refrigerator is provided with the temperature control valve and the flow valve.

4. The high purity aluminum continuous crystallization purification system according to claim 2, characterized by, The mandrel is externally provided with a heat dissipation fin (32) which is spirally arranged along the length direction of the mandrel.

5. The high purity aluminum continuous crystallization purification system according to claim 2, wherein, The shaft sleeve comprises a high-temperature-resistant non-stick aluminum sleeve (29-1) and a high-purity graphite sleeve (29-2). The high-temperature-resistant non-stick aluminum sleeve is butt-jointed with the high-purity graphite sleeve. The high-temperature-resistant non-stick aluminum sleeve is arranged at one end close to the bottom end of the mandrel. The high-purity graphite sleeve is arranged at one end close to the top end of the mandrel.

6. The high purity aluminum continuous crystallization purification system according to claim 5, wherein, The shaft sleeve is conical with a taper of 0.5-5°.

7. The high purity aluminum continuous crystallization purification system according to any one of claims 2-6, characterized in that, The first furnace body comprises a crystallization crucible (12) and a crucible heater (13). The crucible heater is arranged outside the crystallization crucible. The electromagnetic stirrer is arranged at the bottom of the crystallization crucible. The first furnace cover is matched with the crystallization crucible. The first furnace cover is provided with a protective gas inlet to pass in protective gas.

8. The high purity aluminum continuous crystallization purification system according to claim 7, characterized by, The first furnace cover is internally embedded with a first heater (26) which is used to heat and keep warm the passed-in protective gas.

9. The high purity aluminum continuous crystallization purification system of claim 8, wherein, The second heater comprises a first radiation heater (48), a first immersion heater (44) and a second immersion heater (49). The first radiation heater and the second immersion heater are both horizontally arranged in the second furnace body. The first immersion heater passes through the second furnace cover and is suspended in the second furnace body. The third heater comprises a second radiation heater (50) and a third immersion heater (51), the second radiation heater is arranged transversely in the third furnace body, and the third immersion heater is arranged transversely in the third furnace body.

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