Pretreatment method and equipment for refined aluminum ingots for remelting

Abstract

The invention belongs to the technical field of aluminum alloy casting, and particularly relates to a pretreatment method and equipment for refined aluminum ingots for remelting, and the pretreatment method comprises the following steps: step 1, transferring original molten aluminum into a furnace body, and adjusting the temperature of the molten aluminum to 730-780 DEG C by using a heating device; step 2, synchronously carrying out refining degassing and boronizing treatment, wherein the treatment time is 20-40 minutes; during refining and degassing, a degassing additive is sprayed into the furnace body, aluminum fluoride and aluminum-boron alloy are brought into the furnace body through the degassing additive, 2-3 KG of aluminum fluoride is added into each ton of primary aluminum, and 2-3 KG of aluminum-boron alloy is added into each ton of primary aluminum; and thirdly, standing is conducted, the standing time is 1-2.5 H, the temperature of the molten aluminum is kept at 730-780 DEG C, and the molten aluminum is transferred into a crucible for segregation after standing is completed. After the technology is adopted, the content of alkali metal such as sodium, calcium and lithium in molten aluminum can be greatly reduced, meanwhile, the content of vanadium and titanium metal is further reduced, and the degassing and deslagging effect is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a method and equipment for pretreating refined aluminum ingots for remelting. Background Art

[0002] In the smelting process of cast aluminum alloy, the temperature of the original aluminum liquid produced by electrolysis is high, usually at 800-900℃. There will be a large amount of hydrogen and various inclusions in the aluminum liquid. As the temperature decreases, the solubility of these hydrogen and inclusions will drop sharply. However, due to the fast cooling speed during the casting process, hydrogen and inclusions cannot escape from the solidified aluminum, but remain in the casting, eventually forming casting defects such as pinholes and looseness. Therefore, when purifying the cast aluminum alloy melt (also known as refining), the gas and inclusions in the melt must be removed.

[0003] The original aluminum liquid produced by electrolysis contains a large amount of alkali metals, such as sodium, calcium, and lithium, due to the influence of the raw materials. The sodium content is as high as 50-60PPM, the calcium content is as high as 10-15PPM, and the lithium content is as high as 15-25PPM. It also contains a large amount of vanadium and titanium metals, with the vanadium content being as high as 100-200PPM and the titanium content being as high as 10-30PPM. For refined aluminum ingots for remelting with special requirements, the alkali metal and vanadium and titanium content cannot meet the requirements, and the aluminum liquid needs to be pretreated to meet the requirements for the production of refined aluminum ingots for remelting. At present, the effect of removing alkali metals and reducing vanadium and titanium in the pretreatment process of the original aluminum liquid is poor, and it cannot meet the requirements for the production of refined aluminum ingots for remelting.

[0004] The degassing device currently used is a graphite rotor degassing device. The graphite rotor is placed in the aluminum liquid. N2, Ar2 or Cl2 is introduced through the hole in the middle of the graphite rotor. The rotor breaks the introduced gas into small bubbles to take out the hydrogen. Since the rotor is at a certain distance from the bottom of the box, the slag remover added during the casting process is deposited in large quantities at the bottom of the box, further affecting the degassing and slag removal effect. How to solve the above problems, reduce the deposition of slag remover, remove impurities, improve degassing efficiency, and reduce the content of other metals in the original aluminum is particularly important. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the present invention provides a method and equipment for pretreating refined aluminum ingots for remelting.

[0006] To achieve the above purpose, the technical solution provided by the present invention is:

[0007] A method for pretreating refined aluminum ingots for remelting, comprising the following steps:

[0008] Step 1: Transfer the original aluminum liquid into the furnace body and use the heating device to adjust the aluminum liquid temperature to 730-780℃;

[0009] Step 2: Perform refining, degassing and boronization treatment simultaneously, with a treatment time of 20-40 minutes; during refining and degassing, spray degassing additives into the furnace body, and use the degassing additives to bring aluminum fluoride and aluminum-boron alloy into the furnace body, adding 2-3 kg of aluminum fluoride per ton of raw aluminum, and 2-3 kg of aluminum-boron alloy per ton of raw aluminum;

[0010] Step 3: Let it stand for 1-2.5 hours, and keep the aluminum liquid temperature at 730-780℃. After standing, transfer it to a crucible for segregation.

[0011] Optionally, the degassing additive selected in step 2 is argon or nitrogen.

[0012] A pretreatment device for refined aluminum ingots for remelting, comprising a furnace body, a cover body, a driving assembly, and a rotor assembly. The furnace body is detachably provided with a cover body, the driving assembly is arranged on the cover body, one end of the rotor assembly is extended into the furnace body, the other end of the rotor assembly is connected to the driving assembly for transmission, and the driving assembly is used to drive the rotor assembly to rotate; the rotor assembly is internally provided with a through hole for introducing a degassing additive, and the upper end of the rotor assembly is connected to a feeding assembly; the feeding assembly comprises a storage barrel and a discharge barrel, the bottom end of the storage barrel is provided with a conical discharge port, a discharge barrel is rotatably provided on the inner wall of the upper end of the storage barrel, and an air inlet pipe is inclinedly provided at one end of the discharge barrel.

[0013] Optionally, a plurality of connecting blocks are evenly distributed on the circumference of the bottom end of the discharge barrel, and the bottom ends of the plurality of connecting blocks are connected to the drainage barrel. The drainage barrel is arranged inside the discharge port, and the upper and lower sides of the drainage barrel are arranged in a conical shape, namely a first conical portion and a second conical portion; the inner wall of the storage barrel is provided with spiral blades along the height direction, and the gap between two adjacent connecting blocks is a discharge overflow port, and the material inside the drainage barrel can fall onto the spiral blades and into the inside of the discharge port through the discharge overflow port.

[0014] Optionally, there is a gap between the spiral blade and the drainage tube.

[0015] Optionally, the width of the cross section of the spiral blade is greater than the distance between the spiral blade and the drainage tube.

[0016] Optionally, the air inlet pipe extends obliquely into the feed barrel and then extends vertically to the downward direction to exit the air inlet joint. The air inlet joint is detachably connected to an air outlet pipe. A mounting hole is provided at the center of the drainage barrel, and the air outlet pipe is provided in the mounting hole. The air outlet pipe is provided directly opposite the discharge port.

[0017] Optionally, a conical material avoidance port is provided at the bottom end of the material discharge port, the material avoidance port is arranged in a forward cone shape, and the material discharge port is arranged in an inverted cone shape.

[0018] Optionally, a heating device is provided on the cover body, and the heating device is a heating rod extending into the furnace body.

[0019] Optionally, the rotor assembly includes a transmission shaft, a rotating rod and a stirring blade, the driving assembly includes a rotating motor and a transmission box, the transmission box is rotatably provided with a transmission shaft, the cover body is detachably provided with a guide cylinder, the bottom end of the transmission shaft extends into the guide cylinder and is arranged close to the inner wall of the guide cylinder; the bottom end of the transmission shaft and the rotating rod are connected by bolts, the connection between the transmission shaft and the rotating rod is arranged inside the guide cylinder, a sealing member is arranged between the guide cylinder and the rotating rod, and the bottom end of the rotating rod is connected with a stirring blade; the transmission shaft and the rotating rod are internally through-set; the upper end of the transmission shaft is detachably connected to the storage barrel, the rotating motor is arranged on the transmission box, and the rotating motor and the transmission shaft are connected for transmission.

[0020] The present invention has the following advantages and beneficial effects:

[0021] In the present invention, by optimizing the pretreatment process, the original aluminum liquid is subjected to a 20-40 minute refining, degassing and boronization treatment at a temperature of 730-780°C, during which: 2-3 kg of aluminum fluoride is added per ton of original aluminum, and 2-3 kg of aluminum boron alloy is added per ton of original aluminum. When the degassing additive is sprayed into the furnace body, aluminum fluoride and aluminum boron alloy are brought into the furnace body, and then the original aluminum liquid is left to stand for 1-2.5 hours at a temperature of 730-780°C. By adding aluminum boron alloy to the aluminum liquid, it reacts with vanadium and titanium to generate a compound insoluble in aluminum; by adding aluminum fluoride to the aluminum liquid, fluoride salt slag is generated. The effects of removing alkali metals and reducing vanadium and titanium are good, which improves the effects of degassing and deslagging.

[0022] After adopting the above process, the content of alkali metals such as sodium, calcium, and lithium in the aluminum liquid can be greatly reduced. The sodium content is reduced by 90-98%, from 50-60PPM to 0-5PPM; the calcium content is reduced by 90-95%, from 10-15PPM to 0-2PPM; the lithium content is reduced by 40-50%, from 15-25PPM to 5-10PPM; at the same time, the content of vanadium and titanium metals is further reduced, the vanadium content is reduced by 60-80%, from 100-200PPM to 20-35PPM; the titanium content is reduced by 50-70%, from 10-30PPM to 5-10PPM. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural diagram of the refined aluminum ingot pretreatment equipment for remelting provided by the present invention;

[0024] Figure 2 A cross-sectional view of the cover body, the driving assembly, and the feeding assembly provided by the present invention;

[0025] Figure 3 for Figure 2 A magnified view of the structure in the middle;

[0026] Figure 4 A structural diagram of the feeding assembly provided by the present invention;

[0027] Figure 5 A first structural cross-sectional view of the feeding assembly provided by the present invention;

[0028] Figure 6 A second structural cross-sectional view of the feeding assembly provided by the present invention;

[0029] Figure 7 A third structural cross-sectional view of the feeding assembly provided by the present invention;

[0030] Figure 8 A structural diagram of the material storage barrel provided by the present invention;

[0031] Fig. 9 A cross-sectional view of the storage barrel provided by the present invention;

[0032] Fig.10 A structural diagram of a discharge cylinder and a drainage cylinder provided by the present invention;

[0033] Fig.11 for Fig.10 A top view of

[0034] Fig.12 for Fig.10 Front view of

[0035] Fig.13 for Fig.12 Sectional view along the AA direction;

[0036] Icons: 1-column, 11-lifting motor, 12-screw, 13-bearing seat, 14-screw nut, 15-lifting arm, 2-furnace body, 21-lining, 3-cover, 31-ring groove, 32-guide cylinder, 321-limiting ring, 33-seal, 4-rotating rod, 41-stirring blade, 42-drive shaft, 5-feeding assembly, 51-storage barrel, 511-conical part, 512-first flange, 513-first connecting hole, 514-discharge port, 515-avoidance port, 516-support, 52-spiral blade, 5 3-bearing, 54-discharging barrel, 541-second flange, 542-second connecting hole, 543-support ring, 544-connecting block, 55-drainage barrel, 551-first conical portion, 552-second conical portion, 553-mounting hole, 56-inlet pipe, 561-third flange, 562-third connecting hole, 563-inlet joint, 57-outlet pipe, 6-transmission box, 61-rotating motor, 62-sprocket one, 63-chain, 64-sprocket two, 65-support seat, 7-heating rod, 71-heating device. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] A method for pretreating refined aluminum ingots for remelting, comprising the following steps:

[0040] Step 1: Transfer the original aluminum liquid into the furnace body 2, and use the heating device 71 to adjust the temperature of the aluminum liquid to 730-780°C.

[0041] Step 2: Perform refining, degassing and boronization treatment simultaneously, with a treatment time of 20-40 minutes; during refining and degassing, spray a degassing additive into the furnace body 2, and the selected degassing additive is argon or nitrogen; and use the degassing additive to bring aluminum fluoride and aluminum-boron alloy into the furnace body 2, adding 2-3 kg of aluminum fluoride per ton of raw aluminum, and adding 2-3 kg of aluminum-boron alloy per ton of raw aluminum.

[0042] Step 3: Let it stand for 1-2.5 hours, and keep the aluminum liquid temperature at 730-780℃. After standing, transfer it to a crucible for segregation.

[0043] Example 1

[0044] Step 1: Transfer the original aluminum liquid into the furnace body 2, and use the heating device 71 to adjust the temperature of the aluminum liquid to 730°C.

[0045] Step 2: Perform refining, degassing and boronization treatment simultaneously, with a treatment time of 20 minutes; during refining and degassing, spray a degassing additive into the furnace body 2, and the selected degassing additive is argon; and use the degassing additive to bring aluminum fluoride and aluminum-boron alloy into the furnace body 2, adding 2 kg of aluminum fluoride per ton of raw aluminum, and adding 2 kg of aluminum-boron alloy per ton of raw aluminum.

[0046] Step 3: Let it stand for 1 hour, keep the aluminum liquid temperature at 730°C, and transfer it to a crucible for segregation.

[0047] Example 2

[0048] Step 1: Transfer the original aluminum liquid into the furnace body 2, and use the heating device 71 to adjust the temperature of the aluminum liquid to 750°C.

[0049] Step 2: Perform refining, degassing and boronization treatment simultaneously, with a treatment time of 30 minutes; during refining and degassing, spray a degassing additive into the furnace body 2, and the selected degassing additive is nitrogen; and use the degassing additive to bring aluminum fluoride and aluminum-boron alloy into the furnace body 2, adding 2.5 kg of aluminum fluoride per ton of raw aluminum, and adding 2.5 kg of aluminum-boron alloy per ton of raw aluminum.

[0050] Step 3: Let it stand for 1.5 hours, keep the aluminum liquid temperature at 750°C, and transfer it to a crucible for segregation.

[0051] Example 3

[0052] Step 1: Transfer the original aluminum liquid into the furnace body 2, and use the heating device 71 to adjust the temperature of the aluminum liquid to 780°C.

[0053] Step 2: Perform refining, degassing and boronization treatment simultaneously, with a treatment time of 40 minutes; during refining and degassing, spray a degassing additive into the furnace body 2, and the selected degassing additive is argon; and use the degassing additive to bring aluminum fluoride and aluminum-boron alloy into the furnace body 2, adding 3 kg of aluminum fluoride per ton of raw aluminum, and adding 3 kg of aluminum-boron alloy per ton of raw aluminum.

[0054] Step 3: Let it stand for 2.5 hours, keep the aluminum liquid temperature at 780℃, and transfer it to a crucible for segregation.

[0055] The following table shows the effects of removing alkali metals and reducing vanadium and titanium in different embodiments of aluminum liquid pretreatment using the process method of the present invention.

[0056]

[0057] By adding aluminum-boron alloy into aluminum liquid, it reacts with vanadium and titanium to form compounds insoluble in aluminum; adding aluminum fluoride into aluminum liquid to form fluoride salt slag, thus achieving the effect of degassing and deslagging.

[0058] After adopting the above process, the content of alkali metals such as sodium, calcium, and lithium in aluminum liquid can be greatly reduced, so as to increase the original aluminum content and prepare for the next step of segregation. The sodium content is reduced by 90-98%, from 50-60PPM to 0-5PPM; the calcium content is reduced by 90-95%, from 10-15PPM to 0-2PPM; the lithium content is reduced by 40-50%, from 15-25PPM to 5-10PPM; at the same time, the content of vanadium and titanium metals is further reduced, the vanadium content is reduced by 60-80%, from 100-200PPM to 20-35PPM; the titanium content is reduced by 50-70%, from 10-30PPM to 5-10PPM.

[0059] Example 4

[0060] like Figure 1-13 As shown, a refined aluminum ingot pretreatment device for remelting includes a furnace body 2, a cover body 3, a driving assembly, a rotor assembly, a feeding assembly 5, etc.

[0061] like Figure 1 , Figure 2 As shown, a heating device 71 is provided on the cover body 3 , and the heating device 71 is a heating rod 7 extending into the furnace body 2 .

[0062] like Figure 1 , Figure 2 As shown, the furnace body 2 is provided with an inner lining 21, and the furnace body 2 is detachably provided with a cover body 3. Specifically, the bottom end of the cover body 3 is provided with an annular groove 31, and the upper end of the furnace body 2 is protruding, so that the upper part of the furnace body 2 can be inserted into the annular groove 31, so as to realize the plug-in connection between the cover body 3 and the furnace body 2.

[0063] As a preferred embodiment of the present invention, the cover 3 is connected to a lifting mechanism, and the lifting mechanism is used to control the lifting of the cover 3 to realize the opening and closing operation of the furnace body 2. Figure 1 As shown, the lifting mechanism includes a column 1, a lifting motor 11, a screw 12, a screw nut 14, and a bearing seat 13. The upper and lower ends of the column 1 are respectively provided with bearing seats 13. The screws 12 are rotatably provided inside the two bearing seats 13. The screw 12 is matched with a screw nut 14. One end of the screw 12 is connected to the lifting motor 11 for transmission. The screw nut 14 is limited by the column 1 and can be lifted and lowered along the column 1. A lifting arm 15 is extended from one end of the screw nut 14, and the lifting arm 15 is fixedly connected to the upper part of the cover body 3.

[0064] like Figure 1-3As shown, the driving assembly is arranged on the cover 3, one end of the rotor assembly is extended into the furnace body 2, and the other end of the rotor assembly is connected to the driving assembly for transmission, and the driving assembly is used to drive the rotor assembly to rotate. The inside of the rotor assembly is through-set for introducing degassing additives, and the upper end of the rotor assembly is connected to the feeding assembly 5, which is used to introduce gas or fixed materials into the rotor assembly and reach the inside of the furnace body 2.

[0065] like Figure 1-3 , Figure 4 and Figure 5 As shown, as a preferred embodiment of the present invention, the feeding assembly 5 includes a storage barrel 51 and a discharge barrel 54, the bottom end of the storage barrel 51 is provided with a conical portion 511, the bottom end of the conical portion 511 is provided with a first flange 512, the circumference of the first flange 512 is provided with a plurality of first connecting holes 513, the inside of the conical portion 511 is provided with a conical discharge port 514, the discharge port 514 is an inverted conical structure; the lower part of the discharge port 514 is provided with a material avoidance port 515, the material avoidance port 515 is a positive conical structure. By providing a conical material avoidance port 515 at the bottom end of the discharge port 514, the discharge port 514 is set to an inverted cone shape, and the material avoidance port 515 is set to a positive cone shape, the material can be drained from the conical discharge port 514 to the center position and fall, the material avoidance port 515 can largely avoid the material, avoid direct friction with the material, thereby reducing the wear of the first flange 512 and reducing the occurrence of leakage. A support 516 is provided on the inner wall of the upper end of the storage barrel 51, and the bearing 53 is supported on the support 516. The outer wall of the bearing 53 is fixed on the inner wall of the storage barrel 51, and the inner wall of the bearing 53 is fixed to the outer wall of the discharge barrel 54. The discharge barrel 54 is rotatably provided through the bearing 53. A second flange 541 is provided on the upper end of the discharge barrel 54, and a plurality of second connecting holes 542 are provided on the circumference of the second flange 541. An L-shaped support seat 65 is provided on the transmission box 6, and the upper end of the support seat 65 is connected to the second flange 541. An air inlet pipe 56 is obliquely provided at one end of the discharge barrel 54, and the air inlet pipe 56 is directly connected to the discharge barrel 54. A third flange 561 is provided on the upper end of the air inlet pipe 56, and a plurality of third connecting holes 562 are provided on the circumference of the third flange 561.

[0066] When a degassing additive (nitrogen, argon, etc.) is introduced into the air inlet pipe 56 and the material (aluminum fluoride, aluminum boron alloy) is placed into the discharge barrel 54, the material falling freely in the discharge barrel 54 is driven by the gas and evenly mixed with the gas, and then reaches the inside of the storage barrel 51, and is finally ejected from the discharge port 514 into the inside of the rotor assembly, and finally reaches the inside of the furnace body 2.

[0067] Example 5

[0068] In Example 4, when the material (aluminum fluoride, aluminum boron alloy) is placed in the discharge barrel 54, the aluminum fluoride and aluminum boron alloy have a certain weight and will fall freely in the discharge barrel 54. The aluminum fluoride and aluminum boron alloy corresponding to each ton of raw aluminum liquid are 2-3KG respectively. Relatively speaking, the weight is light and the quantity is small. Therefore, a mechanism for uniform feeding of solid materials is generally not specially designed, but the material (aluminum fluoride, aluminum boron alloy) is poured into the discharge barrel 54 at one time. However, in such an operation, the material will fall rapidly due to gravity, and the blowing of gas makes it impossible for the material to be evenly and dispersedly mixed with the gas and sprayed into the rotor assembly by the gas, but enters at one time, which eventually causes the material to enter the aluminum liquid at one time, resulting in the added slag remover (aluminum fluoride, aluminum boron alloy) being deposited in large quantities at the bottom of the box without being stirred and dispersed, further affecting the degassing and deslagging effect.

[0069] Therefore, based on Example 4, further optimization and improvement are made.

[0070] like Figure 6 As shown, further, a plurality of connecting blocks 544 are evenly distributed around the bottom circumference of the discharge barrel 54, and the bottom ends of the plurality of connecting blocks 544 are connected to the drainage barrel 55, which is arranged inside the discharge port 514, and the upper and lower sides of the drainage barrel 55 are arranged in a conical shape, namely, a first conical portion 551 and a second conical portion 552. The inner wall of the storage barrel 51 is provided with spiral blades 52 along the height direction, and the gap between two adjacent connecting blocks 544 is a material discharge overflow port, and the material inside the drainage barrel 55 can fall onto the spiral blades 52 and fall into the inside of the discharge port 514 through the material discharge overflow port.

[0071] There is a gap between the spiral blade 52 and the drainage tube 55, so that when the material falls, it can fall into the discharge port 514 through the gap.

[0072] As one preferred embodiment, the width of the cross section of the spiral blade 52 is greater than the distance between the spiral blade 52 and the drainage tube 55. The width of the cross section of the spiral blade 52 is recorded as D, and the distance between the spiral blade 52 and the drainage tube 55 is recorded as L. The width of the cross section of the spiral blade 52 is greater than the distance between the spiral blade 52 and the drainage tube 55 because when the material falls from the lower barrel to the surface of the first conical portion 551, the material is evenly dispersed and slides down along the conical surface of the first conical portion 551. Most of the material slides to the surface of the spiral blade 52 and accumulates on the spiral blade 52. A small part of the material falls directly through the gap between the spiral blade 52 and the drainage tube 55 to the discharge port 514 and is sprayed into the rotor assembly along with the gas. At the same time, during the material conveying process, the rotor assembly rotates, and the storage barrel 51 also rotates synchronously, so the internal spiral blade 52 also rotates, and the storage barrel 51 cooperates with the spiral blade 52 to be equivalent to the spiral blade 52 elevator. When the material is placed on the spiral blade 52 at the bottom, the spiral blade 52 rotates continuously, driving the material to rise to the upper part of the storage barrel 51. After reaching the uppermost end, the material on the spiral blade 52 is squeezed and falls again, and falls through the gap between the spiral blade 52 and the drainage barrel 55 to reach the discharge port 514. It is equivalent to setting a material falling buffer mechanism to prevent the material from falling to the discharge port 514 at one time, but to achieve uniform material falling in multiple times, multiple stages, and gradually.

[0073] With this design, even if the material is poured into the discharge barrel 54 at one time, it can prevent a large amount of material from being sprayed into the rotor assembly at one time, and can achieve uniform and gradual falling of the material into the discharge port 514, and can also prevent the discharge port 514 from being blocked, reduce the degree of blockage, and be sprayed into the rotor assembly by gas, and finally reach the furnace body 2 evenly. Finally, it is avoided that the material enters the aluminum liquid at one time, resulting in the problem of a large amount of deposition of the added slag remover (aluminum fluoride, aluminum boron alloy) at the bottom of the box.

[0074] On the contrary, if the discharge port 514 is blocked, the spiral blade 52 can be reversed to drive the extruded material downward, and the material is squeezed out from the discharge port 514 to the rotor assembly. In other words, this structure can reduce the blockage of the discharge port 514 by rotating the motor 61 forward or reverse, and even if it is blocked, it can be unblocked. When feeding, the rotor assembly can be slowly controlled to rotate, and the storage barrel 51 can be controlled to slowly rotate forward or reverse, thereby achieving uniform discharge.

[0075] Example 6

[0076] This embodiment further optimizes and improves on the basis of Embodiment 5.

[0077] like Figure 7-13As shown, further, the air inlet pipe 56 extends obliquely into the feed barrel and then vertically extends to the downward direction to produce an air inlet connector 563, on which a detachable connection is provided with an air outlet pipe 57, and a mounting hole 553 is provided at the center of the drainage barrel 55, in which the air outlet pipe 57 is disposed, and the air outlet pipe 57 is disposed directly opposite the discharge port 514.

[0078] With this design, the gas does not contact the material in the discharge barrel 54, but at the discharge port 514. The gas outlet pipe 57 faces the discharge port 514. The material slowly and evenly falls to the discharge port 514 and is brought into the rotor assembly by the gas, thus achieving a stable feeding operation. It should be noted that after the material is placed in the discharge barrel 54, the upper end of the discharge barrel 54 needs to be closed to enable the material and gas to be sprayed into the furnace through the rotor assembly.

[0079] Example 7

[0080] In the present invention, the rotor assembly includes a transmission shaft 42, a rotating rod 4 and a stirring blade 41, and the driving assembly includes a rotating motor 61 and a transmission box 6. The transmission shaft 42 is rotatably arranged on the transmission box 6, and a guide cylinder 32 is detachably arranged on the cover body 3. A limit ring 321 is arranged at the upper end of the guide cylinder 32, and the bottom end of the transmission shaft 42 extends into the guide cylinder 32 and is arranged close to the inner wall of the guide cylinder 32. The bottom end of the transmission shaft 42 and the rotating rod 4 are connected by bolts, and the connection between the transmission shaft 42 and the rotating rod 4 is arranged inside the guide cylinder 32, and a sealing member 33 is arranged between the guide cylinder 32 and the rotating rod 4. The bottom end of the rotating rod 4 is connected with the stirring blade 41; the transmission shaft 42 and the rotating rod 4 are arranged through the inside; the upper end of the transmission shaft 42 and the storage barrel 51 are detachably connected. The rotating motor 61 is arranged on the transmission box 6, and the rotating motor 61 and the transmission shaft 42 are connected for transmission. As a preferred embodiment, a sprocket 1 62 is connected to the output shaft of the rotating motor 61 , a sprocket 2 64 is connected to the transmission shaft 42 , and the sprocket 1 62 and the sprocket 2 64 are connected via a chain 63 .

[0081] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for pretreating refined aluminum ingots for remelting, comprising the following steps: Step 1: Transfer the original aluminum liquid into the furnace body and use the heating device to adjust the aluminum liquid temperature to 730-780℃; Step 2: Perform refining, degassing and boronization treatment simultaneously, with a treatment time of 20-40 minutes; during refining and degassing, spray degassing additives into the furnace body, and use the degassing additives to bring aluminum fluoride and aluminum-boron alloy into the furnace body, adding 2-3 kg of aluminum fluoride per ton of raw aluminum, and 2-3 kg of aluminum-boron alloy per ton of raw aluminum; Step 3: Let it stand for 1-2.5 hours, and keep the aluminum liquid temperature at 730-780℃. After standing, transfer it to a crucible for segregation.

2. The method for pretreating refined aluminum ingots for remelting according to claim 1, characterized in that: The degassing additive selected in step 2 is argon or nitrogen.

3. A device for pre-treating refined aluminum ingots for remelting using the pre-treating method of claim 1, characterized in that: Including furnace body, cover body, drive assembly, rotor assembly, The furnace body is detachably provided with a cover body, the driving assembly is arranged on the cover body, one end of the rotor assembly is extended into the furnace body, the other end of the rotor assembly is connected to the driving assembly for transmission, and the driving assembly is used to drive the rotor assembly to rotate; The rotor assembly is provided with a through hole inside for introducing a degassing additive, and the upper end of the rotor assembly is connected to a feed assembly; The feeding assembly comprises a storage barrel and a discharge barrel. The bottom end of the storage barrel is provided with a conical discharge port. The upper end inner wall of the storage barrel is rotatably provided with a discharge barrel. One end of the discharge barrel is inclinedly provided with an air inlet pipe.

4. The equipment for pre-treating the refined aluminum ingot for remelting according to claim 3 is characterized in that: A number of connecting blocks are evenly distributed on the circumference of the bottom end of the discharge barrel, and the bottom ends of the connecting blocks are connected to the drainage barrel. The drainage barrel is arranged inside the discharge port, and the upper and lower sides of the drainage barrel are both arranged in a conical shape, which are the first conical part and the second conical part respectively; the inner wall of the storage barrel is provided with spiral blades along the height direction, and the gap between two adjacent connecting blocks is the discharge overflow port, and the material inside the drainage barrel can fall onto the spiral blades and into the inside of the discharge port through the discharge overflow port.

5. The equipment for pre-treating the refined aluminum ingot for remelting according to claim 4 is characterized in that: There is a gap between the spiral blade and the drainage tube.

6. The equipment for pre-treating the refined aluminum ingot for remelting according to claim 5 is characterized in that: The width of the cross section of the spiral blade is greater than the distance between the spiral blade and the drainage tube.

7. The equipment for pre-treating the refined aluminum ingot for remelting according to claim 4 is characterized in that: The air inlet pipe extends obliquely into the feed barrel and then extends vertically to the downward direction to exit the air inlet joint. The air inlet joint is detachably connected to an air outlet pipe. A mounting hole is provided at the center of the drainage barrel, and the air outlet pipe is provided in the mounting hole. The air outlet pipe is provided directly opposite the discharge port.

8. The equipment for pre-treating the refined aluminum ingot for remelting according to claim 4 is characterized in that: A conical material avoidance port is arranged at the bottom end of the material discharge port, the material avoidance port is arranged in a forward cone shape, and the material discharge port is arranged in an inverted cone shape.

9. The equipment for pre-treating the refined aluminum ingot for remelting according to claim 3 is characterized in that: The cover body is provided with a heating device, which is a heating rod extending into the furnace body.

10. The equipment for pre-treating the refined aluminum ingot for remelting according to claim 3, characterized in that: The rotor assembly includes a transmission shaft, a rotating rod and a stirring blade, and the driving assembly includes a rotating motor and a transmission box. A transmission shaft is rotatably provided on the transmission box, a guide cylinder is detachably provided on the cover body, the bottom end of the transmission shaft extends into the guide cylinder and is arranged close to the inner wall of the guide cylinder; the bottom end of the transmission shaft is connected to the rotating rod by bolts, the connection between the transmission shaft and the rotating rod is arranged inside the guide cylinder, a sealing member is arranged between the guide cylinder and the rotating rod, and a stirring blade is connected to the bottom end of the rotating rod; the transmission shaft and the rotating rod are arranged through each other; The upper end of the transmission shaft is detachably connected to the storage barrel, the rotating motor is arranged on the transmission box, and the rotating motor is connected to the transmission shaft for transmission.

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