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EP3508591B1 - Procédé et appareil pour éliminier des contaminants d'un métal fondu - Google Patents

Procédé et appareil pour éliminier des contaminants d'un métal fondu Download PDF

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Publication number
EP3508591B1
EP3508591B1 EP16798544.9A EP16798544A EP3508591B1 EP 3508591 B1 EP3508591 B1 EP 3508591B1 EP 16798544 A EP16798544 A EP 16798544A EP 3508591 B1 EP3508591 B1 EP 3508591B1
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EP
European Patent Office
Prior art keywords
metal
duct
molten metal
impurities
furnace
Prior art date
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Application number
EP16798544.9A
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German (de)
English (en)
Other versions
EP3508591A1 (fr
EP3508591B8 (fr
Inventor
José Antonio MAROTO SOTO
Daniel MORIÑIGO SOTELO
Ana RIVAS SALMÓN
Roberto Manuel ÁLVAREZ LÓPEZ
Diego ARRANZ DE LA FUENTE
Maria Estibaliz ALCALDE DE LA CUESTA
Alicia RODRIGUEZ CARRASCAL
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Fundacion Cidaut
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Fundacion Cidaut
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Publication date
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Priority to HRP20210045TT priority Critical patent/HRP20210045T1/hr
Priority to PL16798544T priority patent/PL3508591T3/pl
Priority to HUE16798544A priority patent/HUE052166T2/hu
Publication of EP3508591A1 publication Critical patent/EP3508591A1/fr
Application granted granted Critical
Publication of EP3508591B1 publication Critical patent/EP3508591B1/fr
Publication of EP3508591B8 publication Critical patent/EP3508591B8/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
    • 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

Definitions

  • This invention lies within the field of the elimination of impurities in contaminated metals, also known as purification, the most representative example being that of aluminum alloys contaminated with iron.
  • oxides and iron are the greatest contaminants found. These aluminum alloys are very easily contaminated with iron due to direct contact with tools and molds during the entire production process and the presence of oxides is due to the high reactivity of the metal in the presence of oxygen.
  • Leenov's document theoretically reflects how electromagnetic forces may actually affect compounds that may be formed with the impurities to be extracted from the metal.
  • This invention is capable of eliminating both exogenous impurities, such as oxides previously formed in the molten metal, for example, as well as endogenous impurities that are dissolved in the metal, the latter being those of greater interest and which shall be affected by a first phase of metallurgical treatment. Thanks to this treatment, the impurities to be eliminated shall become new compounds the electrical conductivity of which shall allow the particles to be eliminated to be affected by an electromagnetic field in an entirely different manner from the base metal.
  • an electromagnetic force generated by linear induction pumps is applied that produced a relative movement between the particle and the metal containing it, which allows this to be an external treatment, without contact and safe, without requiring the insertion of any metal component in contact with the molten metal, thus preventing possible contamination, such as the degradation of these components.
  • the metal is always contained within a ceramic channel or duct, never in contact with metallic components, thus preventing contamination from tools during the entire process.
  • the purifying process is performed continuously and may be adapted to any melting or maintenance furnace of those commonly used in the foundry industry.
  • the object of the invention is a purification process and installations for molten metals contaminated with impurities that is industrially viable.
  • the technical problem to be solved is to configure the elements of the installations and to establish the steps of the process in order to achieve said objective.
  • the invention is based on the capacity of moving a particle with different conductivity from that of the metal containing it, the base metal, with a difference of at least one order of magnitude, referring to the decimal power (10 1 ), due to the effect of an electromagnetic field.
  • the first step in the process consists in transforming an impurity, the metallurgical or metallurgical treatment step, in the event that such impurity is dissolved within the metal matrix, as an endogenous impurity, into a final particle with a conductivity of at least one order of magnitude of difference with that of the metal, relating to the decimal power, for which an initial element or compound is added to the molten metal. Therefore, we achieve an intermetallic compound or final particle that can be affected by the action of an electromagnetic field. Therefore, the process includes first of all a metallurgical or metallurgical treatment step to be performed in a furnace, in which to melt and mix the metal to be purified with the necessary alloying elements.
  • a second physical or separation treatment step in which the electromagnetic field is produced that acts upon the molten metal and on the particles of different electrical conductivity, wither exogenous or formed in the previous metallurgical step, from the endogenous particles.
  • One advantage is that the process is of low cost since these are simple steps that use forces that can be produced economically, using linear induction pumps.
  • Another advantage is that it is compatible with existing furnaces, since the installation produces the electromagnetic field in an inductive manner and from outside the existing furnaces, unlike methods requiring the insertion of electrodes to apply direct current.
  • Another advantage is that the duct through which the metal flows in this installation is ceramic and external to the furnace, and therefore simple to separate in the case, for example, of an emergency shutdown.
  • Another advantage is that the metal is constantly contained in ceramic channels or ducts and reservoirs ceramic, and does not therefore become contaminated with elements from the metal containers and tools, as would happen with iron.
  • Another advantage is that it is a selective process, which can eliminate impurities without affecting the remaining elements in the base metal alloy, if present, since it shall only affect those elements affected by the metallurgical treatment.
  • Another advantage is that it can be operated continuously and in an automatic manner with the use of commercial components used in automatic installations, such as controls, automatons, etc.
  • Another advantage is that the impurities, which usually form a kind of scum or sludge, can be eliminated easily from the container mentioned in Claim 10.
  • Another advantage is that it can be designed based on the flow rate requirements characteristic of each industrial installation in which it is implemented.
  • Another advantage is it's low maintenance cost, the same as molten metal decanting systems.
  • the purification process disclosed is capable of eliminating endogenous and exogenous impurities from the contaminated metal, provided that the particles have an electrical conductivity that is different in at least one order of magnitude, with regard to the decimal power, to that of the metal that contains them.
  • the electromagnetic device (3) Figures 2 and 3 , generates an electromagnetic field (B) on the metal with the impurities, perpendicular to a current density (J) that is induced upon the same metal lengthwise to the second duct (6) through which it circulates, such that it produces an electromagnetic force (F L ), which according to the Lorentz force law should be perpendicular to B and J.
  • the resulting force from all electromagnetic and fluid dynamic forces that act upon a particle contained within the molten metal on which B and J are applied, with a difference in conductivity of at least one order of magnitude with respect to the decimal power and the metal it is contained in, causes a relative movement of that particle with respect to that of the molten metal, in the separation step (S).
  • the difference in electric conductivity between the molten metal and the particle to be eliminated shall determine the magnitude and sense of this resulting force, which may be in the same sense as that of the electromagnetic force (F L ) or contrary to it.
  • Figure 1 shows in the black circle the particle and the resulting force that acts upon it when the conductivity of the particle is lower than that of the molten metal, in which case it is in an opposite direction to the electromagnetic force (F L ) generated on the metal.
  • a metallurgical treatment M
  • Another important aspect is the shape of the compound to be eliminated, since the resulting force is greater the greater the volume/surface ratio of the impurity.
  • adding manganese produces the compound AlSi(FeMn), which also has three different morphologies: as a Chinese character ( Figure 4 ), a star ( Figure 5 ), or a polygon ( Figure 6 ). It has been proven that the most advantageous configuration is that of the polygon, since it has a greater volume/surface ratio.
  • Figure 2 shows a diagram of the installation for eliminating impurities in a contaminated metal that includes a first fusion furnace (1) in which said metal can be melted and which is independent from a second furnace (2) for metallurgical treatment (M).
  • An initial element or compound is added to the molten metal that combines with the impurity in order to form an intermetallic compound or final particle with a suitable electrical conductivity.
  • Both furnaces (1, 2) are connected by a first ceramic duct (5).
  • an electromagnetic field is created by means of linear induction pumps, the field lines of which are crosswise to the movement of the fluid contained in the second duct (6). There is thus a resulting force (R) acting upon the final particle that is capable of moving it, separation step (S).
  • the action of the magnetic field is performed where the molten metal circulates; for the sake of simplicity we indicate the corresponding duct, although it could also be a deposit close to the electromagnetic device (3) or even inside it.
  • Figure 3 shows the variant in which the first (1) and second (2) furnaces are integrated into a third fusion and metallurgical treatment (M) furnace (9). Obviously, the first connection duct (5) between the first (1) and second (2) furnaces is removed.
  • M third fusion and metallurgical treatment
  • the configuration includes a boost pump (4) to ensure the required flow rate in the event of a very large installation; form the electromagnetic device (3) exits a third duct (7) that connects to such boost pump (4) from which exits a fourth duct (8) to the corresponding furnace (1, 9).
  • Said boost pump (4) although not shown, may be located anywhere in the installation, even inside any of the furnaces (1, 2, 9), since its function is that inherent to any boost pump, of propelling the fluid passing through it.
  • the electromagnetic device (3) comprises a ceramic reservoir, not shown, in which the particles containing impurities are deposited separately from the molten metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)

Claims (10)

  1. Processus d'élimination en continu de contaminants dissous dans un métal fondu, de tels contaminants étant à la fois exogènes au métal fondu et endogènes à celui-ci, caractérisé en ce qu'un champ électromagnétique (B), généré par des pompes à induction linéaires, est appliqué sur le métal contaminé qui s'écoule à travers un deuxième conduit en céramique (6) et à travers lequel une densité de courant (J) est induite dans une direction longitudinale à celle du conduit, en raison de la force électromagnétique produite dans le métal, force de Lorentz (FL), et des forces dynamiques fluides dérivées du mouvement du métal, une force résultante (R) agit sur la particule qui provoque un mouvement réciproque de ladite particule par rapport à celui du métal fondu, lorsque la différence de conductivité électrique entre le métal fondu et la particule est d'au moins un ordre de grandeur par rapport à la puissance décimale, ladite différence de conductivité est obtenue dans des contaminants endogènes en créant un composé intermétallique ou une particule finale par la réaction entre le contaminant à éliminer et l'ajout d'un élément ou composé initial dans une étape métallurgique (M) avant l'application du champ électromagnétique, la phase de séparation (S).
  2. Processus selon la revendication 1, dans lequel l'élément ou composé initial qui se combine au contaminant est un élément choisi parmi les groupes 4 et 7 du tableau périodique.
  3. Processus selon la revendication 1 dans lequel les particules exogènes à éliminer sont des oxydes du métal de base.
  4. Processus selon la revendication 2, dans lequel, pour éliminer du fer, l'élément initial est du manganèse ou du zirconium.
  5. Processus selon la revendication 4, dans lequel on obtient le composé intermétallique AlSi (FeMn) dont les particules acquièrent une morphologie de caractère chinois, d'étoile et/ou de polygone.
  6. Installation pour éliminer des contaminants dissous dans un métal, comprenant un premier four de fusion (1) dans lequel ledit métal peut être fondu et un deuxième four de traitement métallurgique (M) (2) dans lequel un élément ou composé initial peut être ajouté au métal, de sorte qu'il se combine avec les contaminants à éliminer pour former un composé intermétallique ou une particule finale, caractérisé en ce qu'après le deuxième four (2), il y a un deuxième conduit en céramique (6) à travers lequel le métal fondu peut se déplacer vers un dispositif électromagnétique (3) pouvant créer un champ électromagnétique via des pompes à induction linéaires, dont les lignes de champ sont perpendiculaires à l'axe longitudinal dudit deuxième conduit (6), de sorte qu'une force résultante (R) agisse sur la particule finale qui peut s'opposer à celle provoquée par le champ électromagnétique sur le fluide, force de Lorentz (FL), et est donc véhiculée à travers ledit deuxième conduit (6).
  7. Installation selon la revendication 6 dans laquelle les deux fours (1, 2) sont reliés via un premier conduit en céramique (5).
  8. Installation selon la revendication 6 dans laquelle les premier et deuxième fours (1, 2) sont conformés en un troisième four unique (9).
  9. Installation selon l'une quelconque des revendications précédentes, dans laquelle, un troisième conduit (7) sort du dispositif électromagnétique (3) et est relié à une pompe de suralimentation (4) d'où sort un quatrième conduit (8) vers le four correspondant (1, 9).
  10. Installation selon l'une quelconque des revendications précédentes, dans laquelle le dispositif électromagnétique (3) comprend un réservoir en céramique dans lequel les particules contenant les contaminants sont rassemblées de manière séparée du métal fondu.
EP16798544.9A 2016-09-02 2016-09-02 Procédé et appareil pour éliminier des contaminants d'un métal fondu Active EP3508591B8 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
HRP20210045TT HRP20210045T1 (hr) 2016-09-02 2016-09-02 Postupak i postrojenje za uklanjanje nečistoća u onečišćenom rastaljenom metalu
PL16798544T PL3508591T3 (pl) 2016-09-02 2016-09-02 Sposób i układ do usuwania zanieczyszczeń w zanieczyszczonym stopionym metalu
HUE16798544A HUE052166T2 (hu) 2016-09-02 2016-09-02 Eljárás és berendezés szennyezett olvadt fémben levõ tisztátalanságok eltávolítására

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2016/070618 WO2018042061A1 (fr) 2016-09-02 2016-09-02 Procédé et équipement d'élimination d'impuretés dans un métal liquide pollué

Publications (3)

Publication Number Publication Date
EP3508591A1 EP3508591A1 (fr) 2019-07-10
EP3508591B1 true EP3508591B1 (fr) 2020-10-21
EP3508591B8 EP3508591B8 (fr) 2021-03-17

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Application Number Title Priority Date Filing Date
EP16798544.9A Active EP3508591B8 (fr) 2016-09-02 2016-09-02 Procédé et appareil pour éliminier des contaminants d'un métal fondu

Country Status (8)

Country Link
EP (1) EP3508591B8 (fr)
DK (1) DK3508591T3 (fr)
ES (1) ES2839213T3 (fr)
HR (1) HRP20210045T1 (fr)
HU (1) HUE052166T2 (fr)
PL (1) PL3508591T3 (fr)
PT (1) PT3508591T (fr)
WO (1) WO2018042061A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0860263A (ja) * 1994-08-23 1996-03-05 Shigeo Asai 溶融金属からの不純物元素の除去方法および装置
US6590200B1 (en) * 1999-04-02 2003-07-08 Worcester Polytechnic Institute Systems for detecting measuring inclusions
KR100379912B1 (ko) * 2000-11-08 2003-04-11 학교법인 한양학원 전자기력을 이용한 알루미늄 중의 철 연속제거 장치
JP5044403B2 (ja) 2005-08-10 2012-10-10 一般財団法人電力中央研究所 純化装置および純化方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Also Published As

Publication number Publication date
ES2839213T3 (es) 2021-07-05
EP3508591A1 (fr) 2019-07-10
PL3508591T3 (pl) 2021-06-14
HUE052166T2 (hu) 2021-04-28
DK3508591T3 (da) 2021-01-04
WO2018042061A1 (fr) 2018-03-08
PT3508591T (pt) 2020-12-18
EP3508591B8 (fr) 2021-03-17
HRP20210045T1 (hr) 2021-03-05

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