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WO2020257834A1 - Dispositif et procédé pour la fusion de copeaux - Google Patents

Dispositif et procédé pour la fusion de copeaux Download PDF

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Publication number
WO2020257834A1
WO2020257834A1 PCT/AT2020/060243 AT2020060243W WO2020257834A1 WO 2020257834 A1 WO2020257834 A1 WO 2020257834A1 AT 2020060243 W AT2020060243 W AT 2020060243W WO 2020257834 A1 WO2020257834 A1 WO 2020257834A1
Authority
WO
WIPO (PCT)
Prior art keywords
melting
melt
furnace
chamber
gases
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/AT2020/060243
Other languages
German (de)
English (en)
Inventor
Harald SEHRSCHÖN
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 WO2020257834A1 publication Critical patent/WO2020257834A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B14/14—Arrangements of heating devices
    • F27B14/143—Heating of the crucible by convection of combustion gases
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/005—Preliminary treatment of scrap
    • 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
    • C22B7/001—Dry processes
    • C22B7/003—Dry processes only remelting, e.g. of chips, borings, turnings; apparatus used therefor
    • 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
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B14/14—Arrangements of heating devices
    • 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • 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 an apparatus and a method for melting metal chips in a melting furnace.
  • chips are often traded as scrap with little value.
  • Another problem results from the collection of chips and non-pure ones, which means that chips are also unpopular in the scrap trade, as they entrain substances added to the melt that reduce the quality of the alloy.
  • chips are also unpopular in the scrap trade, as they entrain substances added to the melt that reduce the quality of the alloy.
  • substances added to the melt For example, iron and copper are mentioned in aluminum alloys, although these are added consciously for the strength and other properties of the alloy, but they are disadvantageous in terms of corrosion resistance.
  • An alloy with recycled aluminum that should be free or poor in these substances, the scrap supplied must be free or poor in these substances, since these substances can hardly or no longer be removed from the melt. It is therefore obvious that chips that are difficult to examine for their real composition are unpopular in this recycling process.
  • the chips that can be fed into the melting process by type during processing represent a considerable economic advantage because the costs of chip processing are reduced and the dross created from the chips by oxidation is reduced. This not only saves the user disposal costs but also raw materials.
  • the price of the raw material of an alloy in the form of ingot is twice as high as the buyback value of chips of the same alloy.
  • gas-fired crucible furnaces are used for the production of cast parts to melt the ingot.
  • the crucible absorbs the ingot and when these are melted the melt.
  • the crucible is in a refractory brick lining and is surrounded by a combustion chamber.
  • the crucible is preferably heated in this combustion chamber with a gas burner.
  • the exhaust gases and the flame heat the crucible and then draw off over a chimney.
  • the crucible is closed by an insulated lid to reduce heat radiation.
  • the disadvantage of these crucible melting furnaces is that they can only be charged with ingots and scrap.
  • the object of the present invention was to overcome the disadvantages of the prior art and to provide a device and a method by means of which a user is able to remelt the metal chips from the machining of cast parts in a melting furnace.
  • the device according to the invention comprises a melting furnace for melting and / or temperature control of melt - At least one combustion chamber which forms a furnace housing with a furnace insert to which a burner is connected and has a flue gas outlet;
  • melt gas line for discharging gases from the melting space, characterized in that the melt gas line leads into the combustion chamber.
  • the cover that is placed on the furnace insert and forms the melting chamber is designed to be movable.
  • the cover for example a hood made of heat-resistant steel, can be mounted vertically relative to the furnace insert. This enables the furnace to be used, in particular a crucible for charging pigs to be made accessible. It is also advantageous if the cover is pivotably mounted over the furnace insert and can be pivoted away from the furnace insert. As a result, further devices can be brought over and into the furnace insert for the melt treatment. For example, degassing with an impeller or the addition of finishing substances is conceivable. In order to increase economic efficiency, it is advantageous if a cover hood can be moved relative to two furnace inserts which each form a lower furnace part with a furnace housing is.
  • a lower part of the furnace can be operated as a holding furnace with a simple cover when it is completely loaded, whereas the cover hood on the second lower part of the furnace is operated by the method in question.
  • the lower parts of the furnace can be exchanged using an exchange system.
  • the cover can also be relocated.
  • a tilt function can be provided in order to empty the melt.
  • the furnace insert can then, for example, have a beak-shaped pouring element or there is another pouring or emptying element on the furnace insert.
  • the melt can also be conveyed out of the furnace insert via another device such as a pump.
  • a conveyor system for the chips is provided in the cover or in parts of the cover.
  • the cover can also be made in several parts. For example, as a ring with a lid or a hemispherical element.
  • an opening is provided in the cover through which the chips are thrown in. The opening does not necessarily have to be closable if the melting gases generate an overpressure in the melting chamber due to the gasification and are drawn off via the melting gas line attached to the cover in such a way that the melting gases do not escape and the introduction of atmospheric oxygen can be controlled in this way, that there is no ignition / deflagration of the melting gases in the melting chamber.
  • a recirculation of exhaust gas from the combustion chamber into the melting chamber can be provided in order to reduce the oxygen content.
  • the oxygen in the air that is available for combustion is burned in the melting chamber with the carbon released from the cooling lubricant to form combustible carbon monoxide (CO) and the hydrogen is combined to form H2O water and gaseous CxHy hydrocarbons, for example C7H16.
  • CO combustible carbon monoxide
  • H2O water and gaseous CxHy hydrocarbons for example C7H16.
  • flue gas analyzes have shown that 100g of chips to which 1g of cooling lubricant adheres already provides the heat to melt the chips. It is advantageous to close the opening for introducing the chips by the conveyor system with the cover.
  • a continuous conveying system is particularly advantageous for continuous operation and constant melt gas generation.
  • a screw conveyor system is applicable. All other conveyor systems are also conceivable, including dosing systems that bring in the chips in the form of briquettes or other compacted forms. Briquette introduction offers the advantage of covering and the entrainment of atmospheric oxygen into the
  • a type of piston pump can always deliver a defined volume of chips and air into the closed melting chamber.
  • a gas supply is provided in the cover which allows the melting gases to be mixed with other gases, for example with exhaust gases with a low residual oxygen content.
  • a probe for measuring the composition of the melting gases in the melting chamber is advantageous in order to set this process in an advantageous manner not only through experiments. In this way, the gases fed to the combustion chamber via the melt gas line can be determined and set via a control unit.
  • melt gases are fed into the combustion chamber via the melt gas line, where a set flame fires into the combustion chamber via the burner and the exhaust gas contains enough residual oxygen so that complete combustion of the melt gas is possible. That's how it wears
  • melt gas line is fed to the burner that fires the combustion chamber and the melt gas is also burned with the gas.
  • the chips are stirred into a prepared melt.
  • the chips could also be introduced directly into the furnace insert, for example a ceramic crucible, and melted over the crucible wall or floating on the melt.
  • Fig. 1 cross section through the melting furnace
  • FIG. 1 a cross section through the melting furnace (1) of the device according to the invention is shown in a greatly simplified manner.
  • the furnace insert (2) and the furnace housing (3) form the combustion chamber (11) and the lower melting furnace part (4).
  • the combustion chamber (1 1) is heated by means of a burner (9) and the furnace insert (2), for example a crucible, metal is melted in the furnace insert (2).
  • the flue gas outlet (12) brings the completely burned exhaust gases into the atmosphere after a certain dwell time in which they still heat the furnace insert (2).
  • the furnace insert (2) is heated by the burner (9) and its flame (11) as well as the flue gas and melt (15) is produced from ingot.
  • chips (6) which may be contaminated with lubricants can be introduced into the melt (15) via a feed device (7) and advantageously be stirred into the melt via a stirrer (14) for faster melting.
  • melt gas gas in the present description
  • melt gas gas in the present description
  • the expanding gas mixture is fed to the burner (9) via a Schmelzgaslei device (8) and burned with the fuel gas (13) in the flame (10). Only indicated by dashed lines, it is also conceivable to feed the melt gas directly to the combustion chamber (11) via the melt gas line (8).
  • the burner (9) and the flame (1 0) must be set so that sufficient residual oxygen in the combustion chamber (1 1) is guaranteed for the complete combustion of the melting gases. It is particularly advantageous if the melting gases are fed into the combustion chamber (11) or into the burner (9) via a conveyor (17) in the melting gas line (8). This can also prevent deflagration in the melting chamber (16). In the figure also indicated only by dashed lines, an exhaust gas feed line from the Rauchgasab passage (12) into the melting chamber (16) is possible.
  • the residual oxygen content in the melting chamber (16) and subsequently in the melting gas can be reduced, which in turn reduces the deflagration and the calorific value of the melting gas is increased as there is less carbon monoxide formation in the melting chamber (16) and in the melting gas line (8) . Because of the entrained oxygen from the air, parts of the hydrocarbon burn to form carbon monoxide, which also has a calorific value that can still be used.
  • All information on value ranges in the objective description should be understood to include any and all sub-ranges, e.g.
  • the indication 1 to 10 is to be understood in such a way that all sub-areas, starting from the lower limit 1 and the upper limit 10, are included, i.e. all subranges start with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1, 7, or 3.2 to 8.1, or 5.5 to 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

L'invention concerne un four de fusion (1) pour faire fondre et/ou pour thermoréguler de la matière fondue (15). Le four de fusion comprend au moins une chambre de combustion (11) formant un boîtier ouvert (3) pourvu d'un insert de four (2), à laquelle est raccordé un brûleur (9) et qui comporte une sortie (12) de gaz de fumée ; un recouvrement (5), qui réalise avec l'insert de four (2) un espace de fusion (16) ; au moins un dispositif d'amenée (7) pour des copeaux métalliques (6) dans l'espace de fusion (16) ; au moins un conduit de gaz de fusion (8) pour évacuer des gaz provenant de l'espace de fusion (16), le conduit de gaz de fusion (8) menant dans la chambre de combustion (11).
PCT/AT2020/060243 2019-06-24 2020-06-15 Dispositif et procédé pour la fusion de copeaux Ceased WO2020257834A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA60160/2019 2019-06-24
AT601602019A AT522726A1 (de) 2019-06-24 2019-06-24 Voorrichtung und Verfahren zum Schmeilzen von Spänen

Publications (1)

Publication Number Publication Date
WO2020257834A1 true WO2020257834A1 (fr) 2020-12-30

Family

ID=71783782

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2020/060243 Ceased WO2020257834A1 (fr) 2019-06-24 2020-06-15 Dispositif et procédé pour la fusion de copeaux

Country Status (2)

Country Link
AT (1) AT522726A1 (fr)
WO (1) WO2020257834A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006035570A1 (fr) * 2004-09-29 2006-04-06 Nippon Crucible Co., Ltd. Appareil et méthode de traitement thermique
WO2008038556A1 (fr) * 2006-09-28 2008-04-03 Nippon Crucible Co., Ltd. Appareil de récupération de métaux précieux
JP2012002492A (ja) * 2010-05-20 2012-01-05 Nippon Crucible Co Ltd 有価金属回収装置
JP6452182B2 (ja) * 2015-09-26 2019-01-16 株式会社広築 アルミニウム切粉溶解装置及び溶解方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6245122B1 (en) * 2000-01-20 2001-06-12 J. W. Aluminum Company Apparatus and method for reclaiming scrap metal
CN107504810B (zh) * 2017-09-12 2024-01-02 江阴市炜仁铝业有限公司 一种环保熔铝方法及环保熔铝炉

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006035570A1 (fr) * 2004-09-29 2006-04-06 Nippon Crucible Co., Ltd. Appareil et méthode de traitement thermique
WO2008038556A1 (fr) * 2006-09-28 2008-04-03 Nippon Crucible Co., Ltd. Appareil de récupération de métaux précieux
JP2012002492A (ja) * 2010-05-20 2012-01-05 Nippon Crucible Co Ltd 有価金属回収装置
JP6452182B2 (ja) * 2015-09-26 2019-01-16 株式会社広築 アルミニウム切粉溶解装置及び溶解方法

Also Published As

Publication number Publication date
AT522726A1 (de) 2021-01-15

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