WO2016004493A1 - Composition de désulfuration et son procédé de production, méthode de conditionnement et d'utilisation dans des cuves de petite taille pour la production de fontes liquides - Google Patents

Composition de désulfuration et son procédé de production, méthode de conditionnement et d'utilisation dans des cuves de petite taille pour la production de fontes liquides Download PDF

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Publication number
WO2016004493A1
WO2016004493A1 PCT/BR2015/000104 BR2015000104W WO2016004493A1 WO 2016004493 A1 WO2016004493 A1 WO 2016004493A1 BR 2015000104 W BR2015000104 W BR 2015000104W WO 2016004493 A1 WO2016004493 A1 WO 2016004493A1
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WO
WIPO (PCT)
Prior art keywords
composition
silo
tube
tubes
metal
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/BR2015/000104
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English (en)
Portuguese (pt)
Inventor
Paulo Airton FERRAZ DE PONTES
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.)
Tecnosulfur Sistema De Tratamiento De Metais Liquidos S/a
Original Assignee
Tecnosulfur Sistema De Tratamiento De Metais Liquidos S/a
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 Tecnosulfur Sistema De Tratamiento De Metais Liquidos S/a filed Critical Tecnosulfur Sistema De Tratamiento De Metais Liquidos S/a
Publication of WO2016004493A1 publication Critical patent/WO2016004493A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12C—BEER; PREPARATION OF BEER BY FERMENTATION; PREPARATION OF MALT FOR MAKING BEER; PREPARATION OF HOPS FOR MAKING BEER
    • C12C1/00—Preparation of malt
    • C12C1/02—Pretreatment of grains, e.g. washing, steeping

Definitions

  • the present invention has its application in the field of metallurgy and relates to a desulphurizing chemical composition, its process of obtaining, whose combination of the formulation and the encapsulated tube packaging method enables its application by immersion during the desulphurization process. of cast irons in small pans.
  • Cast iron has particles of different shapes that directly affect its thermomechanical properties. Traditionally, cast irons are classified according to the color of their fracture, and a microstructural analysis shows that grays have graphite (C) in their constitution, whites have carbides (Fe3C, M3C or M7C3) and blends a mixing of the two phases. Graphite can be in compact form, veins or nodules, among others, depending on the presence of small amounts of elements, among which the most important are magnesium and cerium, added in a process known as nodularization.
  • Nodular cast iron an alloy essentially composed of iron and carbon, with graphite contained in its structure, presented in a spheroidal form. It presents eutectic reaction during its solidification and, as a result, the melting temperatures are much lower than the other ferrous alloys, being used for melting cubilot furnaces or electric arc and induction furnaces. Sequentially, the material is added to a treatment pan for nodularization of the graphite present in the structure in order to leave it in a spheroidal shape. The process of obtaining nodular cast irons in large plants is carried out in three stages: obtaining cast iron (in cubilot furnace, electric induction furnace and / or electric arc furnace), desulphurization and nodularization.
  • vermicular cast iron does not differ significantly from gray and nodular cast iron.
  • the difference between these alloys is mainly due to the type of morphology of their graphites.
  • the formation of vermicular graphite is due to the action of magnesium, which is a nodularizing element, with an active content between 0.01 and 0.02%. This amount is insufficient to generate nodular cast iron, but sufficient to ensure a stable range of vermicular cast iron without the formation of lamellar graphite.
  • the graphite phase in vermicular cast iron appears as worms or vermicular particles.
  • White cast iron is a Fe-C alloy that solidifies according to the metastable version of the Fe-C diagram, ie carbon manifests itself in the combined form of Fe3C, presenting at room temperature a microstructure consisting of transformed ledeburite ( eutectic mixture of perlite and cementite) and perlite.
  • the intermittent desulphurization process is carried out in a "cigar pan" that holds the liquid metal and has a capacity of over two tons, having a porous plug inserted in its bottom and which, disposed in the spout, receives the furnace metal with average temperatures from 1400 ° C to 1500 ° C.
  • the plug is triggered with predetermined flow rates, already stirring the material.
  • a desulfurizing composition is manually added and after the filling is completed, the metal is stirred for a time of approximately 10 to 15 minutes, which may vary according to each process. Once the stirring period is over, desulphurization is completed by manually removing the slag formed by the use of scrapers.
  • the reactor commonly used in small industries is the electric induction furnace due to the short time available for desulphurization treatment and the low volumes of metal used in the process. Due to these factors, in the induction furnace base irons are used, characterized by being metal alloys containing defined ranges of chemical specification of compounds that allow the refining treatment to form any type of cast iron, be they gray, white, nodular. and or vermicular. Because of the need for this strict control of the base iron's chemical specification, its cost is quite high.
  • US 47055961 describes a method of a composition used for desulphurisation of nodular cast irons, composed of magnesium and calcium oxide, where magnesium is heated to a certain temperature until
  • the patent differs from the present one in that it has a distinct composition as well as the method of obtaining and applying it.
  • Patent BR 8901759 describes a method of desulphurization of cast iron produced by a blast furnace prior to conversion to steel.
  • This process there is use of a large length composite tubular shell where inside there is an axial zone, where locates magnesium in a powdery way or granular, and an annular zone, separated from the axial zone by an intermediate wall, where a promisvorent or granular raw material is located. Consequently, a neutral gas is blown into the process and the slag generated is removed.
  • the disclosed patent differs from the present patent in that it is used in desulphurization of cast iron from a blast furnace. It also differs in the way the raw material is packaged in the metal composite as well as the characteristics of the composite.
  • PI 95101306 B1 describes an apparatus which enables refining treatments of cast irons as well as inoculation for formation of nodular cast irons, either in continuous or batch processes. Although it is a similar alternative, it differs from the present patent in that it only contemplates the possibility of carrying out the desulphurization treatment. On the other hand, the patent described herein presents a desulphurizing composition, a device for its storage and application and, mainly, enables the process of desulphurization of cast irons in pans with a capacity of less than two tons.
  • raw materials are used as sources of the compounds calcium oxide (CaO), calcium carbide (CaC 2 ) and metallic magnesium (Mg), aluminum aluminum (Al) and sodium oxide (Na 2 THE).
  • Raw materials are selected and chemically analyzed for quality control.
  • Calcium carbide and calcium oxide are milled in known milling processes, the source materials of sodium oxide and metallic aluminum are added to the calcium oxide milling circuit to be mixed with the calcium carbide and then homogenized. Subsequently, metallic magnesium is added to the formed mixture. After mixing all the raw materials to form the desulphurizing composition, their encapsulation in cylindrical tubes that allow their application efficiently for the proposed purposes.
  • Flowchart 1 represents the preparation of the raw materials to the encapsulation phase of the resulting desulphurizing chemical composition.
  • the desulphurizing chemical composition may also have the following formulation: [066] 20 to 50% CaO + 40 to 70% CaC 2 + 1 to 20% Mg
  • the product will be sent to a dosing silo to be filled into cylindrical tubes, which may have different constructive arrangements as described below.
  • the desulphurizing composition is encapsulated in tubes through a filling device coupled to the bottom base of the storage silo via a drive valve. After filling, the cylindrical tubes are sealed and labeled and then sent for storage.
  • Encapsulation tubes of the desulphurizing chemical composition may be understood from the accompanying attached figures below and from the following description:
  • Figure 1 is a view of the male socket cylindrical tube of the double encapsulated cylinder.
  • Figure 2 is a view of the sealing ring.
  • Figure 3 is a view of the female socket cylindrical tube of the double encapsulated cylinder.
  • Figure 4 is a view of the assembly of the double encapsulated cylinder.
  • Figure 5 represents view of the double encapsulated cylinder.
  • Figure 6 represents view of double encapsulated cylinder and sealing ring positioning.
  • Figure 7 represents a view of the components of the triple encapsulated cylinder.
  • Figure 8 is a view of the assembled triple encapsulated cylinder and sealing ring positioning; Detail A illustrates the sealing ring.
  • Figure 9 represents view of the triple encapsulated cylinder.
  • Figure 10 depicts details of triple encapsulated cylinder assembly and sealing ring positioning.
  • the double encapsulated cylinder (1) has the following constructive characteristics:
  • Cylindrical tube (1a) preferably of cardboard, having at one end a male socket (1w) and the other end plugged with a stamped tin material (1x), in a compatible size to seal the tube (1b) containing the female socket (1 y);
  • - cylindrical tube (1b) preferably of cardboard, having at one end a female socket (1y) and the other end plugged with a stamped tin material (1z).
  • O-ring (5) of compatible thickness to be inserted into the fitting between the tubes (1a and 1b), separating the desulphurizing composition into the tube (1).
  • the triple encapsulated cylinder (2) has the following constructive characteristics:
  • compositions of up to two tonnes capacity may be either by hand or mechanically, as set out in the accompanying figures below and in the following description:
  • Figure 11 represents a view of the beginning of the application manually.
  • Figure 12 represents a sequence view of the manual application with the tube already immersed in the metal bath, the deterioration of the tube and release of the desulfurizing composition encapsulated therein.
  • Figure 13 represents the completion of manual application with tube deterioration and release of the desulfurizing composition encapsulated therein.
  • the method of applying the desulfurizing composition of cast irons is by dipping encapsulated cylindrical tube (1 or 2) into the treatment pan (6) by coupling one end of the tube to a rod (7).
  • the rod (7) is suspended and immersed in the metal bath in a treatment pan (8) with a capacity of less than two tons of metal, and the encapsulated tube (1 or 2) is consumed due to the thermal energy released by the metal bath.
  • the process of obtaining the composition ensures a sulfur partition ratio sufficient to prevent reversal of the removed sulfur under operating conditions for cast iron treatment.
  • the addition of said composition effectively provides increased efficiency, reduced treatment time and reduced thermal loss of molten material in treatment pans with capacities of less than two tons.
  • foundries having cubilot furnaces, induction furnaces with production capacities of one hundred kilograms, three hundred kilograms, five hundred kilograms and two tons and their respective treatment pans were used.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Food Science & Technology (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

L'invention concerne une composition de désulfuration et son procédé de production, une méthode de conditionnement et d'utilisation dans des cuves de petite taille pour la production de fontes liquides, dans des procédés utilisant des cuves de traitement à capacités inférieures à deux tonnes de métal liquide, cette composition comprenant de l'oxyde de calcium (CaO), du carbure de calcium (CaC2) et du magnésium métallique (Mg), de l'aluminium métallique (Al) et de l'oxyde de sodium (Na2O) homogénéisés, de préférence avec des teneurs de 20 à 50% de CaO, de 40 à 70% de CaC2, de 1 à 20% de Mg, de 1 à 10% d'Al, de 1 à 10% de Na2O, ou sans addition d'aluminium métallique (Al) ni d'oxyde de sodium (Na2O). Le procédé d'obtention fait intervenir un chemin de préparation du mélange d'oxyde de calcium, d'oxyde de sodium et d'aluminium métallique, un chemin de préparation du carbure de calcium, un chemin de préparation de la matière première sous forme de magnésium métallique, l'homogénéisation du mélange et son transport jusqu'au silo de stockage, point d'intersection entre les trois chemins, le remplissage avec le produit fini dans le silo de dosage en vue d'obtenir la composition de désulfuration encapsulée dans des tubes cylindriques au moyen d'un dispositif de remplissage accouplé à la base inférieure du silo et comprenant une valve d'actionnement. Les tubes d'encapsulation (1) de la composition peuvent être de type double (1) ou triple (2). La méthode d'utilisation consiste en l'immersion d'un tube (1 ou 2) contenant la composition de désulfuration encapsulée dans la cuve (6) de traitement, avec abaissement progressif de sorte que la libération de l'énergie thermique du bain métallique détériore et libère la composition.
PCT/BR2015/000104 2014-07-11 2015-07-09 Composition de désulfuration et son procédé de production, méthode de conditionnement et d'utilisation dans des cuves de petite taille pour la production de fontes liquides Ceased WO2016004493A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRBR1020140171975 2014-07-11
BR102014017197A BR102014017197A2 (pt) 2014-07-11 2014-07-11 composição dessulfurante e seu processo de produção, método de acondicionamento e de aplicação em panelas de pequeno porte para produção de ferros fundidos

Publications (1)

Publication Number Publication Date
WO2016004493A1 true WO2016004493A1 (fr) 2016-01-14

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PCT/BR2015/000104 Ceased WO2016004493A1 (fr) 2014-07-11 2015-07-09 Composition de désulfuration et son procédé de production, méthode de conditionnement et d'utilisation dans des cuves de petite taille pour la production de fontes liquides

Country Status (2)

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BR (1) BR102014017197A2 (fr)
WO (1) WO2016004493A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995033859A1 (fr) * 1994-06-08 1995-12-14 Donau Chemie Aktiengesellschaft Agent de desulfuration pour bains de fusion de fonte brute et de fonte affinee et son procede de fabrication
WO1997038142A1 (fr) * 1996-04-04 1997-10-16 Pechiney Electrometallurgie Melange desulfurant a base de carbure de calcium
WO2000047781A1 (fr) * 1999-02-12 2000-08-17 Pechiney Electrometallurgie Melange desulfurant a base de carbure de calcium et/ou de chaux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995033859A1 (fr) * 1994-06-08 1995-12-14 Donau Chemie Aktiengesellschaft Agent de desulfuration pour bains de fusion de fonte brute et de fonte affinee et son procede de fabrication
WO1997038142A1 (fr) * 1996-04-04 1997-10-16 Pechiney Electrometallurgie Melange desulfurant a base de carbure de calcium
WO2000047781A1 (fr) * 1999-02-12 2000-08-17 Pechiney Electrometallurgie Melange desulfurant a base de carbure de calcium et/ou de chaux
EP1153143B1 (fr) * 1999-02-12 2003-10-22 Skw Bellegarde Sas Melange desulfurant a base de carbure de calcium et/ou de chaux

Also Published As

Publication number Publication date
BR102014017197A2 (pt) 2016-02-16

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