WO2020217572A1 - Agitateur et dispositif de traitement par fusion - Google Patents

Agitateur et dispositif de traitement par fusion Download PDF

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Publication number
WO2020217572A1
WO2020217572A1 PCT/JP2019/043739 JP2019043739W WO2020217572A1 WO 2020217572 A1 WO2020217572 A1 WO 2020217572A1 JP 2019043739 W JP2019043739 W JP 2019043739W WO 2020217572 A1 WO2020217572 A1 WO 2020217572A1
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WO
WIPO (PCT)
Prior art keywords
housing
rotary
stirrer
drive shaft
attached
Prior art date
Application number
PCT/JP2019/043739
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English (en)
Japanese (ja)
Inventor
大間知　聡一郎
英之 斎藤
菜々子 片山
Original Assignee
日本金属化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本金属化学株式会社 filed Critical 日本金属化学株式会社
Priority to JP2021515772A priority Critical patent/JP7090959B2/ja
Publication of WO2020217572A1 publication Critical patent/WO2020217572A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ

Definitions

  • the present invention relates to a stirrer and a molten metal treatment device used for stirring a liquid substance, for example, a metal such as a molten aluminum alloy or a magnesium alloy, or various aqueous solutions.
  • Products using aluminum alloys and magnesium alloys may be recovered at the end of the product life, melted in a melting furnace, etc., and reused for other products.
  • oxides and inclusions attached to the oxides (hereinafter referred to as "dross"). ) Is formed.
  • oxides such as Al 2 O 3 , MgO, Al 2 MgO 4 , SiO 2 , silicate, Al ⁇ Si ⁇ O, FeO, Fe 2 O 3 , carbides (Al 4 C 3 , Al 4)
  • boride AlB 2 , AlB 12 , TiB 2 , VB 2
  • Al 3 Ti Al 3 Zr
  • CaSO 4 Al N and various halides.
  • a technique for separating and discharging dross from the molten metal by changing the rotational inclination of the melting furnace and efficiently recovering the dross is disclosed (for example, refer to Japanese Patent Publication No. 10-227567).
  • the dross can be efficiently recovered in the dissolution step, but since the molten Al contains an impurity gas component such as hydrogen, it is necessary to further degas at the time of re-dissolution.
  • a technique of blowing a treatment gas such as argon, nitrogen, or chlorine into the molten metal in the treatment tank and gas bubbling is known.
  • a method of injecting flux into the molten metal in gas bubbling see, for example, Japanese Patent Publication No. 63-183136
  • a method of stirring the molten metal in gas bubbling with a rotary blade for example, Japan.
  • Japanese Patent Publication No. 10-306330, Japanese Patent Application Laid-Open No. 62-297422, and Japanese Patent Publication No. 7-68591 are known.
  • the above-mentioned stirrer and molten metal treatment device had the following problems. That is, when stirring with the rotary blades, only the bubbles were mixed, and the diameter of the bubbles could not be sufficiently reduced. For this reason, the surface area per unit volume of the bubble becomes small, and the residence time in the molten metal becomes short, so that the bubble diffuses into the atmosphere in a short time before it sufficiently reacts. Therefore, the supply amount of the processing gas is, for example, about 20 L per minute at 0.3 MPa, and it is necessary to supply about 100 L of the processing gas in a general processing time. For this reason, a large amount of processing gas is used, which causes an increase in processing cost.
  • the present invention has been made to solve the above problems, and by generating microbubbles, the surface area in the molten metal or the aqueous solution is increased, and the surface area is kept in the molten metal or the aqueous solution for a long time. It is an object of the present invention to provide a stirrer capable of generating water and a molten metal treatment apparatus using the stirrer.
  • the stirrer according to the present embodiment is a stirrer which is attached to a rotary drive shaft to agitate molten metal and supply a processing gas, in which a proximal end side is attached to a drive mechanism supporting the rotary drive shaft and the processing gas.
  • the molten metal treatment apparatus is a molten metal treatment apparatus that agitates the molten metal and removes unnecessary gas by supplying the processing gas, and is arranged in a processing tank for accommodating the molten metal and above the processing tank.
  • a gas supply / rotation drive mechanism having a rotation drive shaft protruding downward, and a stirrer provided at the lower end of the gas supply / rotation drive mechanism and detachably provided in the processing tank are provided.
  • the stirrer has a tubular housing whose base end side is attached to a drive mechanism that supports the rotation drive shaft and to which the processing gas is supplied, and a cylindrical housing whose base end side is inserted into the housing and whose base end side is attached to the rotation drive shaft. It includes a combined rotating shaft, a rotating blade provided on the tip end side of the housing and attached to the tip end side of the rotating shaft, and an opening formed on the outer surface of the housing.
  • the stirrer according to the present embodiment is a stirrer which is attached to a rotary drive shaft to agitate water or an aqueous solution and supply a processing gas, in which the proximal end side is attached to a drive mechanism supporting the rotary drive shaft and the process.
  • the present invention by generating microbubbles, it is possible to increase the surface area in the molten metal or the aqueous solution and to keep the microbubbles in the molten metal or the aqueous solution for a long time.
  • FIG. 1 is an explanatory diagram showing a degassing treatment apparatus according to an embodiment of the present invention.
  • FIG. 2 is a vertical cross-sectional view showing a stirrer and a stirrer incorporated in the degassing treatment device.
  • FIG. 3 is a perspective view showing a rotary blade incorporated in the stirrer.
  • FIG. 4 is an explanatory diagram showing a degassing treatment step by the degassing treatment apparatus.
  • FIG. 5 is an explanatory diagram showing the operation of the stirrer.
  • FIG. 6 is an explanatory diagram showing the operation of the stirrer.
  • FIG. 7 is an explanatory view showing a modified example of the stirrer.
  • FIG. 8 is an explanatory diagram showing the operation of the stirrer.
  • FIG. 9 is an explanatory view showing a modified example of the stirrer.
  • FIG. 1 to 3 are diagrams showing a degassing treatment device (molten metal treatment device) 10 according to an embodiment of the present invention.
  • the degassing treatment device 10 is detachably attached to the treatment tank 20, the gas supply / rotation drive mechanism 30 arranged in the vicinity of the treatment tank 20, and the gas supply / rotation drive mechanism 30.
  • the stirrer 50 is provided, and the flux charging device 100 and the dross removing device 110 arranged in the vicinity of the processing tank 20 are provided.
  • the treatment tank 20 is made of a refractory material and has a treatment capacity capable of degassing up to 1500 kg of molten aluminum per batch.
  • the flux charging device 100 has a function of charging the flux F into the molten aluminum P in the processing tank 20.
  • the flux injection device 100 has a plurality of hoppers, shooters, etc. containing an aluminum scavenger as the flux F, and a predetermined amount of the aluminum scavenger of a predetermined component is blended in a predetermined blending ratio in the treatment tank 20. It has a function to put it in.
  • the flux F may be mixed with the processing gas G described later and supplied from the gas supply / rotation drive mechanism 30.
  • the dross removing device 110 is composed of a scraping jig and a suction / discharging device.
  • the scraping jig is made of plate-shaped carbon, refractory material, and ceramic member, and its surface is specially processed so that dross does not adhere.
  • the suction / discharge device has a trumpet-shaped suction port made of a heat-resistant material, and communicates with the collection pot via a suction pump.
  • a melting furnace 200 is arranged adjacent to the treatment tank 20, and molten aluminum is poured from the melting furnace 200 into the treatment tank 20 in a non-oxidizing atmosphere.
  • the melting furnace has a dross separation / removal function, and a large amount of dross is separated from the molten metal and removed in the melting furnace.
  • the gas supply / rotation drive mechanism 30 includes a gantry 31, a post 32 extending vertically on the gantry 31 and swinging along an axis in the vertical direction, and an endless belt arranged along the post 32.
  • a 33, a slider 34 attached to the endless belt 33, and a drive motor 35 for driving the endless belt 33 are provided.
  • a gas supply unit 36 for supplying the processing gas G is arranged in the gantry 31 and is connected to a gas supply line 46 described later.
  • An arm 39 is attached to the slider 34 in the horizontal direction, and a stirring device 40 is provided at the tip thereof. Therefore, the arm 39 can be swiveled and lifted by the post 32.
  • the stirring device 40 includes a gantry 41 attached to the tip of the arm 39, a rotary drive motor 42 provided on the gantry 41, a rotary drive shaft 43 extended in the vertical direction, a rotary drive motor 42, and a rotary drive. It includes a belt 44 hung on the upper end of the shaft 43, a cylindrical portion 45 that airtarily supports the rotary drive shaft 43, and a stirrer 50 detachably attached to the tip of the rotary drive shaft 43. ..
  • the cylindrical portion 45 and the rotary drive shaft 43 are made of a metal material and are not immersed in the molten aluminum P.
  • a gas supply line 46 is connected to the cylindrical portion 45, and the processing gas G is supplied from the gas supply portion 36 described above.
  • the processing gas G is, for example, a non-oxidizing gas such as argon gas or nitrogen gas. Flux gas may be mixed as described above.
  • the supply of the processing gas G has the effect of cooling the heat received from the molten aluminum P and preventing the temperature of each component from rising.
  • the agitator 50 has a tubular housing 51 whose base end side is airtightly coupled to the lower end of the cylindrical portion 45, and a rotary shaft 52 which is inserted inside the housing 51 and whose base end side is coupled to the rotation drive shaft 43.
  • the rotary drive shaft 43 and the rotary shaft 52 are connected by a screw structure (upper and lower shaft connecting screws) provided inside.
  • a rotary blade 53 attached to the tip end side of the rotary shaft 52 is arranged in the housing 51.
  • Six oval-shaped openings 54 are formed on the base end side of the housing 51 from the position of the rotary blade 53. The size and number of openings 54 may be appropriately changed depending on the type of molten metal. Since the stirrer 50 is immersed in the molten aluminum P, it is made of a heat-resistant ceramic material or carbon material.
  • a sufficient space is provided between the housing 51 and the rotating shaft 52, and the processing gas G is supplied to the periphery of the rotating blade 53 through this space.
  • the rotary blade 53 has three blades 53a arranged side by side in the axial direction.
  • the blades 53a are separated from each other in the axial direction of the rotating shaft 52, and a gap S is formed.
  • the outer peripheral surface of each blade 53a is formed close to the inner wall of the housing 51, and its dimensions are set to, for example, about 3 mm to 10 mm.
  • the spiral surface 53b of each blade 53a is formed downward to the right.
  • the rotary blade 53 is made of a ceramic material so that it is not melted by the heat of the molten aluminum P. Since it is difficult to form a complicated shape of a ceramic material, by arranging the blades 53a in parallel in the axial direction as described above, a complicated blade shape like a metal blade is realized, and microbubbles are formed. Ensure characteristics such as stirring power and feed output. When the blades 53a are arranged side by side, the bubble diameter can be further reduced by arranging the spiral surfaces 53b of the adjacent blades 53a so as to form a continuous surface. In addition, the characteristics of the rotary blades 53 can be adjusted according to the arrangement, shape, and number of blades.
  • R in FIGS. 5 and 6 indicates a rotation direction.
  • the molten aluminum P is transferred from the melting furnace to the processing tank 20 together with the dross D (step S1).
  • the flux F having a predetermined component is put into the treatment tank 20, the stirrer 50 is lowered, and the rotary blade 53 is immersed in the treatment tank 20 just below the surface of the molten aluminum P. Then, the rotary blade 53 is rotated to stir the molten aluminum P, dross D, and flux F for several minutes. As a result, the dross D is modified and separated from the molten aluminum P (step S2).
  • the stirrer 50 is further lowered, the tip 51a side of the housing 51 is positioned near the bottom of the processing tank 20, and the rotary blade 53 is rotated at, for example, 1000 rpm.
  • the rotary blade 53 is rotated at, for example, 1000 rpm.
  • the processing gas G supplied from the gas supply unit 36 enters the housing 51, which has a negative pressure due to the action of the rotation of the rotary blade 53, becomes a bubble B1 having a relatively large diameter, and forms the rotary blade 53 and the casing. It enters the gap in the body 51.
  • the bubble B1 moves in and out of the gap S to repeat compression and expansion.
  • the bubble B1 is crushed into bubbles B2 and bubbles B3 having a small diameter.
  • microbubbles (diameter: several ⁇ m to 50 ⁇ m) are formed by the shearing action of the rotary blade 53.
  • step S3 when the processing gas G is supplied and diffused in the molten aluminum P (gas bubbling), impurity gas components such as dross D and hydrogen mixed in the molten aluminum P float on the surface of the molten aluminum (step S3).
  • the stirring force at this time shall be weak enough not to inhibit the gas bubbling reaction.
  • the stirrer 50 is further lowered, the tip 51a of the housing 51 is positioned at the deepest part of the processing tank 20, and the molten aluminum P is agitated.
  • the dross scraping member is lowered, the lower portion thereof is immersed in the molten metal surface, and the dross D is gathered at a specific location in the processing tank 20 (step S4).
  • the collected dross D is sucked and discharged from the processing tank 20 by a suction and discharge device, and collected in a recovery pot (step S5).
  • microbubbles are generated by compressing, expanding, and shearing the processing gas G in the gap between the rotary blade 53 and the housing 51. Can be made to. For this reason, the surface area of the treated gas in the molten metal is increased to facilitate the reaction with the dissolved hydrogen gas, and by staying in the molten metal for a long time, the reaction time with the hydrogen gas is extended, which is sufficient. Hydrogen gas can be removed.
  • an opening 54 for sucking an amount of molten metal corresponding to the negative pressure accompanying the rotation of the rotary blade 53 is formed on the side surface of the housing 51 accommodating the rotary blade 53, a vortex is formed on the surface of the molten metal. It is possible to prevent the formation of oxides and prevent the formation of oxides by entraining the atmosphere. That is, it is possible to release the microbubbled processing gas, suppress excessive stirring of the molten metal, and promote the dispersion of the processing gas. Therefore, degassing can be sufficiently performed, and a high quality aluminum alloy can be obtained.
  • FIG. 7 is an explanatory diagram showing the configuration of the stirrer 50A according to the above-mentioned modified example of the stirrer 50.
  • the stirrer 50A has a tubular housing 55 whose base end side is airtightly coupled to the lower end of the cylindrical portion 45, and a rotary shaft 52 which is inserted inside the housing 55 and whose base end side is coupled to the rotation drive shaft 43. I have.
  • the tip 55a of the housing 55 is open.
  • a rotary blade 53 attached to the tip end side of the rotary shaft 52 is arranged in the housing 55.
  • the size and number of openings 56 may be appropriately changed depending on the type of molten metal. Since the stirrer 50A is immersed in the molten aluminum P, it is made of a heat-resistant ceramic material or stainless steel material.
  • a sufficient space is provided between the housing 55 and the rotating shaft 52, and the processing gas G is supplied to the periphery of the rotating blade 53 through this space.
  • the stirrer 50A configured in this way is used in the same manner as the stirrer 50 as described above.
  • the behavior of the molten aluminum P is that the molten aluminum P is sucked in from the tip 55a side and discharged from the opening 56.
  • the processing gas G supplied from the gas supply unit 36 enters the housing 55, which has a negative pressure due to the action of the rotation of the rotary blade 53, and is microbubbled. Then, after continuing the gas bubbling for several minutes, the gas blowing is stopped and the degassing process is completed.
  • FIG. 8 is an explanatory diagram showing a modified example of the connection between the rotary drive shaft 43 and the rotary shaft 52 in the above-mentioned stirrers 50 and 50A.
  • the connection between the rotary drive shaft 43 and the rotary shaft 52 is connected by a coupling mechanism (rigid coupling) 60 in addition to the internal screw structure described above.
  • the coupling mechanism 60 is arranged at the coupling portion between the rotary drive shaft 43 and the rotary shaft 52, and is arranged on the outer peripheral side of the rotary drive shaft 43 and the rotary shaft 52.
  • the coupling mechanism 60 includes an inner cylinder portion 61 arranged on the outer periphery of the joint portion between the rotary drive shaft 43 and the rotary shaft 52.
  • a nut 61a is formed in the center of the inner cylinder portion 61, and a pair of deformed portions 61b having a tapered shape and a male screw formed on the outer circumference are provided at both ends.
  • a slit is formed in the deformed portion 61b, and the inner diameter dimension thereof can be adjusted. Nuts 62 and 63 are screwed into the male screw of the deformed portion 61b.
  • the coupling mechanism 60 configured in this way is formed, the coupling force between the rotary drive shaft 43 and the rotary shaft 52 becomes firm, and it is possible to suppress the amount of runout at high rotation speed (1000 rpm or more). ..
  • the coupling mechanism 60 can be attached by positioning the connection portion between the rotary drive shaft 43 and the rotary shaft 52 on the inner cylinder portion 61 and tightening the nuts 62 and 63.
  • aluminum alloy is exemplified as the above-mentioned metal, it can also be applied to molten metal of other metals such as magnesium alloy. Further, in addition to the molten metal, in water, an aqueous solution, etc., the reaction efficiency of the processing gas into the liquid can be improved and the reaction time can be extended by using microbubbles having a diameter of about several ⁇ m to 50 ⁇ m. It is possible to save the amount of processing gas.
  • rotation direction and rotation speed of the rotation shaft 52, and the positions, numbers, sizes, and shapes of the openings 54 and 56 are not limited to those described above, and may be appropriately changed according to the stirring target and the physical properties of the gas. Is also good.
  • the present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof.
  • each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained.
  • the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent requirements are deleted can be extracted as an invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

La présente invention concerne un agitateur (50), qui est fixé à un arbre d'entraînement rotatif (43), agite un alliage d'aluminium fondu et fournit un gaz de traitement (G), comprenant : un boîtier cylindrique (51) qui comporte un côté d'extrémité de base fixé à une partie cylindrique (45) pour supporter l'arbre d'entraînement rotatif (43) et qui est alimenté en gaz de traitement (G) ; un arbre rotatif (52) inséré dans le boîtier (51) et qui comporte un côté extrémité de base accouplé à l'arbre d'entraînement rotatif (43) ; une lame rotative (53) disposée sur le côté pointe (51a) du boîtier (51) et fixée au côté pointe de l'arbre d'entraînement rotatif (52) ; et des ouvertures (54) disposées dans une surface extérieure du boîtier (51) et sur le côté extrémité de base du boîtier (51) par rapport à la lame rotative (53). Par conséquent, l'agitateur (50) génère des microbulles, de sorte que la surface du gaz de traitement dans une masse fondue ou une solution aqueuse puisse être augmentée et le gaz de traitement puisse rester dans la masse fondue ou la solution aqueuse pendant une longue durée.
PCT/JP2019/043739 2019-04-26 2019-11-07 Agitateur et dispositif de traitement par fusion WO2020217572A1 (fr)

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JP2021515772A JP7090959B2 (ja) 2019-04-26 2019-11-07 撹拌機及び溶湯処理装置

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JP2019-085914 2019-04-26
JP2019085914 2019-04-26

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018178205A (ja) * 2017-04-14 2018-11-15 日本金属化学株式会社 撹拌機及び溶湯処理装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05112836A (ja) * 1991-10-18 1993-05-07 Mitsui Mining & Smelting Co Ltd 溶融金属脱ガス炉の気泡分散装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018178205A (ja) * 2017-04-14 2018-11-15 日本金属化学株式会社 撹拌機及び溶湯処理装置

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JP7090959B2 (ja) 2022-06-27
JPWO2020217572A1 (ja) 2021-10-21

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