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WO2018021934A1 - Procédé de refonte de déchets métalliques et four pour sa mise en œuvre - Google Patents

Procédé de refonte de déchets métalliques et four pour sa mise en œuvre Download PDF

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Publication number
WO2018021934A1
WO2018021934A1 PCT/RU2017/000041 RU2017000041W WO2018021934A1 WO 2018021934 A1 WO2018021934 A1 WO 2018021934A1 RU 2017000041 W RU2017000041 W RU 2017000041W WO 2018021934 A1 WO2018021934 A1 WO 2018021934A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
metal
chamber
chambers
loading
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/RU2017/000041
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English (en)
Russian (ru)
Inventor
Максим Юрьевич ХАЦАЮК
Виктор Николаевич ТИМОФЕЕВ
Петр Алексеевич ХОМЕНКОВ
Евгений Сергеевич ЕЛИЗАРОВ
Виктор Васильевич ТАРАКАНОВ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2018021934A1 publication Critical patent/WO2018021934A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • 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
    • C22B21/00—Obtaining aluminium
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to furnaces and methods for melting metals in furnaces, and in particular, but not exclusively, to methods for loading small aluminum waste into a furnace.
  • Metallurgical melting furnaces are designed to carry out the process of heating solid metals to a state of melting. Heating of metal bodies in the natural environment is accompanied by intense oxidation of their surface due to contact with oxygen. Particularly large specific losses of metal on oxides occur during the remelting of thin metal scrap having a relatively large external surface area. At the same time, a dense oxide film and a slag layer are formed on the surface of the liquid metal in the furnace bath, which impede the immersion of small metal particles, such as chips.
  • Melting furnaces are known in which the loading of small metal waste is carried out through a liquid metal funnel created in an additional chamber connected by a piping system to the main volume of the furnace. A funnel is formed due to the forced circulation of the metal.
  • a disadvantage of the known melting furnace is that pipelines are used to connect the main and loading chambers.
  • the intense formation of oxides on surfaces in contact with liquid metal is natural for all metallurgical equipment operating in a natural atmosphere.
  • this problem is especially relevant for closed channels and pipelines of smelting furnaces.
  • the inaccessibility and isolation of pipelines when cleaning or replacing them requires stopping the furnace until it cools completely.
  • the time of continuous operation of the furnace is reduced, which, ultimately, adversely affects the reliability, energy efficiency and production productivity as a whole.
  • the objective of the invention is to increase the period of continuous operation of the melting furnace by ensuring the availability of channels for cleaning.
  • the technical result of the invention is to reduce the need to completely cool the furnace for cleaning, and as a result, the productivity of the furnace is increased.
  • the claimed furnace for remelting metal waste containing the main and loading chambers of the furnace, which is a lined metal frame, the chambers are partially filled with solid and / or liquid metal, an arc induction machine is installed on the outer surface of the loading chamber, characterized in that the inner surface of the loading chamber has a helical shape, cameras
  • Access to the main chamber of the furnace can be additionally done through
  • heaters are installed in the loading chamber.
  • An arc induction machine can be installed on the outer cylindrical part of the surface of the loading chamber.
  • the prechamber and / or loading chamber can be of closed design and equipped with a door or a cover.
  • the remelting furnace may include an immersion flap installed in the channel, or be made with a dividing wall below the working level of liquid metal.
  • Additional heaters may be installed.
  • a method of remelting metal waste characterized by heating metal waste in an induction heating furnace having a main and loading chambers, the temperature of the metal being maintained by radiation and convection from electric or gas heaters, characterized in that the furnace chambers are partially filled with solid and / or liquid metal, an arc induction machine is placed on the outer surface of the loading chamber, and a screw shape is formed on the inner surface of the loading chamber, the chambers are connected by one them flat half-open channel, for access to the main chamber of the furnace using a loading chamber and / or prechamber.
  • the loading of large scrap metal is carried out through the prechamber directly into the main volume of the furnace.
  • the metal is drained through a notch located above the metal level with a rotary furnace and below the metal level with a stationary furnace.
  • the change in the direction and nature of the circulation of the melt is carried out by changing the circuit for connecting the inductor windings in a multiphase network to reverse.
  • FIG. 1 schematically shows the proposed melting furnace.
  • FIG. 2 shows the nature of the circulation of the melt in the feed chamber and the connecting channel.
  • FIG. 3 shows in a projection on a vertical plane a parametric diagram of the mutual arrangement of the generatrix faces of the inner screw surface of the loading chamber and the emerging velocity profile in the connecting channel at different levels of liquid metal.
  • FIG. 4 is an isometric view of the loading chamber with a segment cut in the chamber wall.
  • FIG. 5 schematically shows a melting furnace with separate atmospheres of the main and loading chambers and an additional heater in the loading chamber.
  • the melting furnace includes a main 1 and loading 2 chamber of the furnace, which is a lined metal frame (Fig. 1).
  • the chambers are partially filled with solid and / or liquid metal 3.
  • the metal is heated and maintained by radiation and convection from electric or gas heaters 4.
  • the chambers are interconnected by a flat channel 5.
  • An arc induction machine b is installed on the outer cylindrical part of the surface of the loading chamber (hereinafter referred to as inductor )
  • inductor The inner surface of the loading chamber, formed by the rotation of the line from position 7 to position 8 around axis 9 (the interface between the channel and the loading chamber), has a helical shape.
  • line 8 is located vertically.
  • a prechamber 10 is used to access the main chamber of the furnace.
  • a melting furnace operates as follows. In the furnace due to the thermal action of the heaters, the temperature of the metal is increased and maintained above its melting point.
  • the inductor is connected to a multiphase network, alternating currents begin to flow through the inductor windings, which create a traveling electromagnetic field.
  • a traveling electromagnetic field induces eddy currents in a liquid metal, which, when interacting with the magnetic field of the inductor, lead to the appearance of electromagnetic forces.
  • Electromagnetic forces provide rotation of the molten metal around axis 9 with an average angular velocity where 2 f is the double angular pole division of the inductor, / is the frequency of the inductor, s is the slip (for MHD machines, the characteristic value is 0.7 - 0.8).
  • a funnel is formed on the free surface of the liquid metal in the loading chamber, through which particles 12 of different density, shape and size are loaded (Fig. 1).
  • the loading of large metal scrap 13 is carried out through a pre-chamber directly into the main volume of the furnace.
  • the metal is drained through a recess 14 located above or below the metal level, depending on the type of furnace (rotary or stationary, respectively).
  • the main parameters describing the characteristics of the helical surface of the loading chamber and the occurring helical motion of the liquid metal are similar to the main parameters known from the theory of propellers [3], namely, the radius R, pitch ⁇ and screw installation angle a.
  • FIG. Figure 3 presents a description of the helical surface of the loading chamber of a melting furnace with this set of parameters.
  • the rotational component of the volumetric velocity of the circulation of liquid metal in the loading chamber can be determined from the expression:
  • a change in the circuit for connecting the inductor windings to a multiphase network leads to a change in the direction and nature of the circulation of the melt.
  • the liquid metal moves from the bottom of the loading chamber along the internal helical surface to the upper layers of the metal and then through the channel into the main chamber of the furnace.
  • Such a regime of flows with a decrease in the inductor power promotes the raising of particles of different densities and the introduction of various additives along the metal mirror into the main chamber of the furnace in laminar mode.
  • the remelting furnace may include an immersion flap installed in the channel, or may be made with a dividing wall 16 located below the working level of the liquid metal. With a significant removal of the loading chamber (long channel), additional heaters 17 can be installed to eliminate solidification of the liquid metal.
  • the present invention it is contemplated to use, for example, a mechanical rotator instead of inductor 6.
  • the method of heating the metal may be different, for example, induction heating.
  • the method and apparatus of the present invention can be used to load particles and articles of various origins and sizes.
  • the method and apparatus of the present invention can be applied to metal melts not only based on aluminum.
  • the method and apparatus of the present invention can also be used in a metal refining process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention concerne des fours et des procédés de fonte de métaux dans des fours, et notamment, mais non exclusivement, des procédés de chargement de déchet d'aluminium de petite taille dans un four. Le résultat technique de l'invention consiste en une diminution de la nécessite de laisser entièrement refroidir le four pour le nettoyage et, en conséquent, en une augmentation de la productivité du four. Ce résultat technique est atteint grâce à un four de refonte de déchets métalliques comprenant des chambres de four principale et de chargement définissant un châssis métallique avec revêtement; les chambres sont partiellement remplies de métal solide et/ou liquide et à la surface externe de la chambre de chargement se trouve une machine à induction à arc; le four est caractérisé en ce que la surface interne de la chambre de chargement est de forme hélicoïdale, et les chambres sont reliées pale un canal semi-ouvert plan. Le procédé de refonte de déchets métalliques est caractérisé en ce que l'on chauffe les déchets métalliques dans un four à chauffage à induction, qui comprend des chambres principale et de chargement; le maintien de la température du métal est assuré par rayonnement et convection depuis des dispositifs de chauffage électriques ou à gaz. Les chambres du four sont partiellement remplies de métal solide et/ou liquide, sur la surface externe de la chambre de chargement est montée une machine à induction à arc, et la surface interne de la chambre de chargement est de forme hélicoïdale tandis que les chambres sont reliées pale un canal semi-ouvert plan; la chambre de chargement et/ou une préchambre est utilisée pour accéder é la chambre principale du four.
PCT/RU2017/000041 2016-07-25 2017-01-30 Procédé de refonte de déchets métalliques et four pour sa mise en œuvre Ceased WO2018021934A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2016130525 2016-07-25
RU2016130525A RU2677549C2 (ru) 2016-07-25 2016-07-25 Способ переплавки металлических отходов и печь для его осуществления

Publications (1)

Publication Number Publication Date
WO2018021934A1 true WO2018021934A1 (fr) 2018-02-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2017/000041 Ceased WO2018021934A1 (fr) 2016-07-25 2017-01-30 Procédé de refonte de déchets métalliques et four pour sa mise en œuvre

Country Status (2)

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RU (1) RU2677549C2 (fr)
WO (1) WO2018021934A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269889A (en) * 1992-08-21 1994-02-23 Cookson Group Plc Melting furnace
US6217823B1 (en) * 1998-03-30 2001-04-17 Metaullics Systems Co., L.P. Metal scrap submergence system
RU2443961C2 (ru) * 2006-04-19 2012-02-27 Сиа "Горс" Способ и аппарат для индукционного перемешивания жидкого металла
US20140232048A1 (en) * 2011-07-07 2014-08-21 Pyrotek, Inc. Scrap submergence system
US20160138868A1 (en) * 2013-06-21 2016-05-19 Emp Technologies Limited Metallurgical apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011074072A1 (fr) * 2009-12-15 2011-06-23 浜松ホトニクス株式会社 Procede de soudage de resine
JP5813693B2 (ja) * 2013-04-23 2015-11-17 高橋 謙三 溶湯金属循環駆動装置及びそれを有するメインバス

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269889A (en) * 1992-08-21 1994-02-23 Cookson Group Plc Melting furnace
US6217823B1 (en) * 1998-03-30 2001-04-17 Metaullics Systems Co., L.P. Metal scrap submergence system
RU2443961C2 (ru) * 2006-04-19 2012-02-27 Сиа "Горс" Способ и аппарат для индукционного перемешивания жидкого металла
US20140232048A1 (en) * 2011-07-07 2014-08-21 Pyrotek, Inc. Scrap submergence system
US20160138868A1 (en) * 2013-06-21 2016-05-19 Emp Technologies Limited Metallurgical apparatus

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Publication number Publication date
RU2016130525A (ru) 2018-01-30
RU2677549C2 (ru) 2019-01-17

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