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WO2014118397A1 - Procédé de fusion de tournures d'aluminium - Google Patents

Procédé de fusion de tournures d'aluminium Download PDF

Info

Publication number
WO2014118397A1
WO2014118397A1 PCT/ES2013/070052 ES2013070052W WO2014118397A1 WO 2014118397 A1 WO2014118397 A1 WO 2014118397A1 ES 2013070052 W ES2013070052 W ES 2013070052W WO 2014118397 A1 WO2014118397 A1 WO 2014118397A1
Authority
WO
WIPO (PCT)
Prior art keywords
aluminum
oven
chip
chief
temperature
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/ES2013/070052
Other languages
English (en)
Spanish (es)
Inventor
Igotz AROCENA FERNANDEZ
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.)
GIESSEREI INSTANDSETZUNG SERVICE 2003 SL
Original Assignee
GIESSEREI INSTANDSETZUNG SERVICE 2003 SL
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 GIESSEREI INSTANDSETZUNG SERVICE 2003 SL filed Critical GIESSEREI INSTANDSETZUNG SERVICE 2003 SL
Priority to PCT/ES2013/070052 priority Critical patent/WO2014118397A1/fr
Publication of WO2014118397A1 publication Critical patent/WO2014118397A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C22B21/0084—Obtaining aluminium melting and handling molten aluminium
    • C22B21/0092—Remelting scrap, skimmings or any secondary source 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • 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
    • 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 a new method of melting aluminum chips, in which crucible or similar furnaces are used, by means of which and with the corresponding heat input and without any prior drying operation of the chip, it is merged.
  • the process of melting aluminum shavings by means of a rotary kiln is currently carried out by means of a chamber preferably cylindrical.
  • Said rotary chambers are equipped with one or two doors with the function of loading / unloading, and are positioned at the ends of said chamber where at least one of them the chip is introduced.
  • the heat necessary for melting the chip is provided by means of a fuel or gas burner, within the same chamber where the chip is melted.
  • a significant amount of salts is applied to the surface of the chip.
  • the flame heats both the chamber and the refractory that covers it internally, and in this way the chip is melted.
  • Another of the known procedures and the use is the fusion of the chip by immersion of the same in a vortex generated by a pump, and recirculation of the Liquid metal.
  • a previously treated chip is required to remove any remaining moisture that may contain, for example, water, oil taladrina and others.
  • Said fusion process is carried out in an oven with a main chamber of liquid aluminum and an auxiliary chamber, which is where the vortex is separated. These two cameras are connected in such a way that the generated vortex ends up dragging the flow towards the main chamber. To create this vortex, a pump specially designed for this is used. At the same point of the vortex is where the previously treated chip is dosed, and is absorbed immediately.
  • Salts are required to protect aluminum.
  • the gases generated in the chip fusion are in contact with the aluminum.
  • the chip Before its fusion the chip needs a previous treatment.
  • the combustion gases are in contact with aluminum.
  • the process generates the immersion of aluminum oxides in the main chamber, reducing the purity of aluminum.
  • the disadvantages of the oxidation of aluminum have their origin in that it is a very electropositive chemical element, consequently, it has a high oxidation potential and is an energy reducing agent. However, it is very resistant to corrosion, both by water and by air. This is because, on its surface, a layer of A1203 aluminum oxide is formed that protects it.
  • the melting process of the aluminum chip is carried out in an oven, preferably of the crucible type.
  • the procedure is started by preheating the oven until it reaches a starting temperature of the IT process, if it is not previously heated.
  • Said process start temperature IT is preferably between 500 and 600 ° C.
  • Said process can be carried out directly or preferably indirectly and gradually through a feeding element, such as a double hopper, and without using any pre-drying treatment.
  • a feeding element such as a double hopper
  • the loading process operates in such a way that the chip level gradually decreases, and once the chip is heated due to the heat transmitted through the walls of the feeding device, the it is falling by gravity inside the oven, while the oven is still being loaded superiorly to its full capacity.
  • the period of time that lasts the process of top loading of chips in the oven is preferably between 1 and 3 hours.
  • the mentioned period of time that lasts the process of top loading of chips in the oven is between 1 and 3 hours.
  • the oven temperature is then increased
  • the chip can have a temperature of 650 ° C, while in the lower part of the interior of the oven the molten chip can have a temperature of 900 ° C.
  • an inert gas By applying an inert gas, it is possible to homogenize said temperature gradient reaching
  • Said inert gas may be Nitrogen, Argon, Chlorine, or other similar gases.
  • the liquid aluminum deoxidation process is then started, for this purpose, according to a characteristic of the invention, a vigorous stirring in the laundry by means of a stirring element in order to achieve that a vortex with liquid aluminum is generated within it, at the same time as it is a second characteristic of the invention to make a contribution of flux or similar material, preferably between 500 and 2000 gr. of flux per ton of molten aluminum, with stirring and vortex being maintained for a certain time, for example between 1 to 3 minutes, in this way all the oxides accumulated on the surface of the broth, are easily removed, obtaining an optimum quality of liquid aluminum
  • the stirring element is preferably a propeller.
  • the stirring of the laundry can optionally be carried out in one direction and then in the opposite direction for a short period of time, in order to improve said stirring process.
  • the stirring element preferably rotates at a speed between 850 to 1,000 rpm in one direction, and between 440 to 640 rpm in the opposite direction; and preferably the rotation time of the stirring element is in a direction between 0.45 to 1.5 minutes, and in the opposite direction between 30 to 60 seconds.
  • the fusion process ends with the elimination of the oxides, and it is cast.
  • a feeding device of the double-hopper type is preferably used, so that the process of load It is carried out gradually and the volume of the hopper is adequate to that of the crucible, with the walls of the hopper receiving the heat of the crucible so that the chips are heated by heat transfer through the walls of the hopper before fall into the oven crucible joining the filling.
  • the applicant has carried out field tests using specifically car tire machining chip, the chemical composition of said chip being AlSi7Mg (A356), with a non-metallic content of 2% between the moisture of the water and the cutting oil, the following results have been reached:
  • the procedure is started with the preheating of the oven up to 550 ° C, the oven is loaded with the help of a double hopper, and as the chip level decreases, the oven continues to load until the end.
  • the oven continues to be heated for one hour after loading with a maximum temperature of 755 ° C.
  • the oxides of the broth are removed, and it is strained.
  • the iron content of the alloy chips has been analyzed in order to quantify the iron contribution that is made in the chip melting process, and the result is 0.13% by weight, by emission spectrometry ICP-OES optics, and during the test it was possible to measure the moisture and chip oil content, with a result of 2.1%.
  • the process object of the present invention can be applied for any type of chip, without being limited to the chip size shown in the table above. Also, a graph is reproduced below by bar chart of the percentage of material retained.
  • the recommended fusion process comprises the following steps:
  • the rotor is rotated at a speed between 900 to 1000 rpm for a period of time between 0.5 to 1.5 minutes, and between 30 to 60 seconds at a rotation speed between 500 to 600 rpm in reverse.
  • the oxides of the broth are removed, and it is strained.

Landscapes

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

Abstract

Le procédé de fusion de tournures d'aluminium selon la présente invention a pour objet de réduire l'investissement initial que présuppose l'acquisition initiale des équipements conçus à cet effet qui existent actuellement, tout en permettant de travailler avec de petites quantités de tournures, ce qui rend ainsi le procédé selon l'invention utile à l'utilisateur qui se consacre uniquement à la fusion de tournures d'aluminium ou bien à d'autres activités, dans lesquelles on travaille avec l'aluminium et on produit des tournures qui, actuellement, sont traitées comme des résidus. Ce procédé de fusion des tournures d'aluminium est réalisé au moyen d'un four, de préférence de type creuset et comprend une série d'étapes.
PCT/ES2013/070052 2013-01-31 2013-01-31 Procédé de fusion de tournures d'aluminium Ceased WO2014118397A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/ES2013/070052 WO2014118397A1 (fr) 2013-01-31 2013-01-31 Procédé de fusion de tournures d'aluminium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2013/070052 WO2014118397A1 (fr) 2013-01-31 2013-01-31 Procédé de fusion de tournures d'aluminium

Publications (1)

Publication Number Publication Date
WO2014118397A1 true WO2014118397A1 (fr) 2014-08-07

Family

ID=51261491

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES2013/070052 Ceased WO2014118397A1 (fr) 2013-01-31 2013-01-31 Procédé de fusion de tournures d'aluminium

Country Status (1)

Country Link
WO (1) WO2014118397A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109811160A (zh) * 2019-02-27 2019-05-28 云南云铝涌鑫铝业有限公司 A356.2铸造铝合金及其前置炉加钛的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997018456A1 (fr) * 1995-11-11 1997-05-22 N-Tec Limited Appareil et procede de caracterisation par filtration de materiaux a l'etat fondu
US6375712B1 (en) * 1998-05-27 2002-04-23 Helge O. Forberg Method of removal of light metals from aluminum
EP1462530A1 (fr) * 2003-03-28 2004-09-29 Nippon Light Metal Company Ltd. Dispositif et procédé d'affinage d'un métal liquide
WO2008103912A1 (fr) * 2007-02-23 2008-08-28 Alcoa Inc. Installation et procédé pour traitement en ligne de métal en fusion au moyen de réactif de sel solide dans un dégazeur à cuve profonde

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997018456A1 (fr) * 1995-11-11 1997-05-22 N-Tec Limited Appareil et procede de caracterisation par filtration de materiaux a l'etat fondu
US6375712B1 (en) * 1998-05-27 2002-04-23 Helge O. Forberg Method of removal of light metals from aluminum
EP1462530A1 (fr) * 2003-03-28 2004-09-29 Nippon Light Metal Company Ltd. Dispositif et procédé d'affinage d'un métal liquide
WO2008103912A1 (fr) * 2007-02-23 2008-08-28 Alcoa Inc. Installation et procédé pour traitement en ligne de métal en fusion au moyen de réactif de sel solide dans un dégazeur à cuve profonde

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109811160A (zh) * 2019-02-27 2019-05-28 云南云铝涌鑫铝业有限公司 A356.2铸造铝合金及其前置炉加钛的方法

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