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EP2405025B1 - Procédé de fabrication d'ébauches en alliage - Google Patents

Procédé de fabrication d'ébauches en alliage Download PDF

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Publication number
EP2405025B1
EP2405025B1 EP20110168903 EP11168903A EP2405025B1 EP 2405025 B1 EP2405025 B1 EP 2405025B1 EP 20110168903 EP20110168903 EP 20110168903 EP 11168903 A EP11168903 A EP 11168903A EP 2405025 B1 EP2405025 B1 EP 2405025B1
Authority
EP
European Patent Office
Prior art keywords
alloy
mixture
brick
brick mixture
water
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.)
Active
Application number
EP20110168903
Other languages
German (de)
English (en)
Other versions
EP2405025A1 (fr
Inventor
Daniel Thomy
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.)
Mfg Metall- und Ferrolegierungsgesellschaft Mbh Hafner Blondin & Tidou
Original Assignee
Mfg Metall- und Ferrolegierungsgesellschaft Mbh Hafner Blondin & Tidou
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 Mfg Metall- und Ferrolegierungsgesellschaft Mbh Hafner Blondin & Tidou filed Critical Mfg Metall- und Ferrolegierungsgesellschaft Mbh Hafner Blondin & Tidou
Publication of EP2405025A1 publication Critical patent/EP2405025A1/fr
Application granted granted Critical
Publication of EP2405025B1 publication Critical patent/EP2405025B1/fr
Active legal-status Critical Current
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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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates

Definitions

  • the invention relates to a process for the production of alloy moldings for providing a molten metal in a smelting furnace with at least one alloying component or increasing its content in the molten metal, wherein a molding mixture using water containing at least one castable alloying element and a binder, and the molding mixture is filled into a casting mold and processed and demoulded into an alloy molding insertable into the furnace.
  • the production of such moldings is basically such that initially a molding mixture is formed, the proportions of alloying element, water, binder and an aggregate in the form of a supporting grain, such as sand, contains. Subsequently, this molding mixture is compacted into the alloy molding, be it in a stone molding press or in a vibrator ( WO 2005/118892 A1 ). For this to be possible, the molding mixture must have a viscoplastic or crumbly consistency.
  • the water used is such that it is just sufficient to cause binding of the binder and to achieve the required consistency.
  • the compression of the molding mixture is a complex operation and requires the presence of a suitable press.
  • the alloy moldings must be such a strength that they can be placed as bulk material in a furnace and go through the furnace largely undamaged.
  • Essential for the achievement of such strength is the grain structure of the molding mixture. Difficulties here are alloying elements which are present in dust form, for example filter dusts or cast iron dusts. Also not ideal are relatively coarse alloying elements, such as crushed scrap parts, metal chips or the like. Strength difficulties also occur when a carbon carrier is processed as the alloying element.
  • the invention has for its object to provide a method for the production of alloy moldings, which is inexpensive and can be used to produce alloy moldings using alloying elements in dust form or piece shape with sufficient strength.
  • This object is achieved in that in the production of the molding mixture at least as much water is added that the molding mixture isszer secured, and that at least as much binder is added that the alloy molding produced from the molding mixture after seven days at the latest setting time at 20 ° C has a strength of at least 4 N / mm 2 , preferably at least 5 N / mm 2 , and that the molding mixture is poured into a large mold whose interior is divided into individual molds, which are filled with the molding mixture in a casting process, and that it is a setting without application of external pressure and finally the resulting alloy molding is removed from the mold.
  • the basic idea of the invention is therefore not to compress the molding mixture, but to produce by casting by first a pourable molding mixture is created and then poured into a mold and allowed to set, the aforementioned setting time with the complete pouring of the molding mixture into the mold starts. It has been found that this method processes both dusty and lumpy alloying elements into an alloy molding of sufficient strength can be, without this requires the use of a press.
  • the method is inexpensive to carry out, and it is versatile, since it is suitable for alloying elements of various kinds and different grain sizes up to the piece size. In this case, in order to avoid cavities in the alloy molding or lack of filling of the mold so much water is added that the molding mixture in the mold isszer convincedd, especially self-leveling. Under the latter is the property to understand that adjusts a flat surface without further action, such as shaking or stripping on the open side of the molding mixture poured into the mold.
  • Suitable alloying elements are metals, including those from which the molten metal essentially consists, in particular iron, but also copper, zinc, chromium, manganese, nickel, molybdenum, titanium or vanadium.
  • the iron may also be in the form of iron alloys such as FeSi, FeMn, FeCr, FeNi, FeMo, FeTi or FeV.
  • Metal oxides and ores, such as FeO, Fe 2 O 3 , MnO are also suitable.
  • the alloying agent may also be a metallic silicon, for example in the form of SiC.
  • the inventive method but also for processing carbon carriers and / or unbound carbon as alloying element, such as graphite, coke breeze, petroleum coke, pitch coke, dust, etc. They can be used for carburizing the molten metal.
  • the alloying element can also be a mixture of at least two of the abovementioned alloy constituents or alloying elements.
  • the lower limit for the addition of water is determined by the property of pourability of the molding mixture. In general, then sufficient water is present to ensure setting of the molding, especially if - as known in the art - cement is used.
  • the strength of the alloy molding with the same binder content is the lower, the higher the water content, ie it is to seek a compromise between good pourability of the molding mixture on the one hand and the final strength of the alloy molding on the other hand.
  • a superplasticizer as is customarily used in the production of concrete, for example lingninsulfonates, melamine-formaldehyde sulfonates, naphthalene-formaldehyde sulfonates, polycarboxylates or hydroxycarboxylic acids and their salts (see standard EN 934-2).
  • the proportion of the flow agent should be in the range of 0.01 to 0.5 Wt .-%, based on the weight of the molding mixture are.
  • a good processability results when the molding mixture is added so much water and optionally flow agent that the molding mixture a slump (measured according to the standard DIN EN 459-2, but without strokes) of at least 15 cm, preferably 19 cm and advantageously not more than 21 cm has.
  • a slump measured according to the standard DIN EN 459-2, but without strokes
  • the weight ratio of water to solid in the molding mixture should not exceed a value of 0.8.
  • Suitable binders are the binders generally used for building materials, in particular hydraulic binders such as cement. Since the binder for the inventively provided use of the alloy molding is an impurity, the proportion of the binder should not be much higher than necessary in order to achieve the strength provided according to the invention. It is therefore expedient if the highest possible possible cement is used, because then the binder content can be kept low. There is a connection to the quantity the water added to achieve pourability such that the higher the water content, the higher the amount of binder must be. In order to achieve a fast setting, a setting accelerator can be added to the cement, which accelerates the solidification and hardening process. The addition of binder should not exceed 40% by weight, based on the total molding mixture, but better not more than 20% by weight, but always provided that the abovementioned minimum strength is achieved.
  • a support grain is added to the molding mixture. It should have a maximum grain size of 1.5 cm. Preferably, sand should be used and the support grain should desirably be present at 5 to 40% by weight based on the total molding mixture.
  • the invention further provides that the molding mixture is vibrated in the mold and / or the free surface is smoothed.
  • a shaking is particularly recommended if the water content and, where appropriate, the content of superplasticizer are so low that there is a risk of the formation of voids or incomplete filling of the mold.
  • the surface should preferably be sprayed with water immediately after the casting process.
  • the Surface be provided with a moisture-impermeable or moisturizing Abbeckung.
  • the inventive method is suitable both for the use of an alloying element, which is present in small pieces, preferably with a mean extent of 0.5 to 5 cm, but also for such an alloying element, which is added in dust or powder form, in particular with a grain size less than 0.1 mm.
  • both forms of alloying elements can be combined with each other, preferably in a weight ratio of 20:80 to 80:20.
  • Casting molds whose internal volume corresponds to the predetermined shape of the alloy molding can be used for the method according to the invention. Instead, however, a trough-shaped large mold can be used, whose interior is divided into individual forms, the large mold is filled with the molding mixture in a single casting. In this case, the interior of the large mold can be subdivided by webs which project upwards into the individual molds. It is then possible to fill the individual molds with the molding mixture so that the resulting alloy moldings are separated from each other. Alternatively, the large mold can also be filled so high that the free surface of the molding mixture is above the webs, so a one-piece structure in the form of a large molding similar to a (reversed) chocolate bar is created.
  • this large blank is then broken into individual pieces in a crusher, which are the alloy moldings form.
  • a break beyond the breaking of the webs between the individual moldings can be made so that the individual moldings thus formed form irregularly shaped molded pieces.
  • the invention also relates to the use of this alloy molding by adding it to a metal melting furnace during the melting of metal, preferably into a cupola furnace, converter, blast furnace or induction furnace.
  • EMC80 is meant a SiC raw material containing 80% pure SiC, the remainder being unreacted free C and SiO 2 .
  • the special agent 1 specified in Example 3 is the binder marketed by HeidelbergCement Bauscher für Geotechnik GmbH & Co. KG under the name “CEM-ROCK 489", while the special agent 2 specified in Example 4 is also from Heidelberg Cement Building Materials for Geotechnik GmbH & Co. KG is under the name “CEM-ROCK MFG” sold binder.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Claims (13)

  1. Procédé de production d'un moule en alliage afin de pourvoir un métal en fusion dans un four de fusion d'au moins un composant d'alliage, ou d'augmenter la part de ce dernier dans la masse de métal en fusion, un mélange moulable étant produit en utilisant au moins ledit élément d'alliage contenant un composant d'alliage ou composé de ce dernier, de l'eau et un liant, et le mélange moulable étant versé dans un moule avant d'être transformé et démoulé en un moule en alliage pouvant être mis dans le four de fusion, caractérisé en ce qu'est utilisée suffisamment d'eau durant la production du mélange moulable pour que le mélange moulable soit auto-coulant, ou plus précisément autonivelant, et qu'est utilisé au moins assez de liant pour que le moule d'alliage obtenu à partir du mélange moulable ait, après un temps de prise de sept jours à 20 °C, une solidité d'au moins 4 N/mm2, idéalement 5 N/mm2, et qu'est versé le mélange moulable dans un gros moule dont l'intérieur est subdivisé en moules individuels remplis du mélange moulable lors d'un processus de moulage et dans lesquels le mélange prend sans qu'une pression externe ne soit nécessaire.
  2. Procédé selon la revendication 1, caractérisé en ce qu'est utilisé, en tant qu'au moins un élément d'alliage, un métal, ou plus précisément du fer, mais aussi en tant qu'alliage de métal comme du FeSi, FeMn, FeCr, FeNi, FeMo, FeTi, FeV, et/ou notamment du cuivre, du zinc, du chrome, du manganèse, du nickel, du molybdène, du titane, du vanadium, ou en tant qu'oxyde ou minerais de métal, comme du FeO, Fe203, MnO, et/ou du SiC et/ou un support de carbone et/ou du carbone non lié, par exemple du graphite, du poussier de coke, du coke de pétrole, du coke de brai, de la poussière d'étanchéité pour carburer le métal en fusion ou un mélange d'au moins deux des composants d'alliage mentionnés précédemment.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce qu'est utilisé dans le mélange de moulage assez d'eau ou d'agent rhéologique (au besoin) pour qu'il obtienne une capacité d' étalement d'au moins 15 cm, idéalement 19 cm et pas plus de 21 cm.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'est ajouté au mélange moulable un agent rhéologique ou un accélérateur.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le rapport d'eau et de matière solide ne dépasse jamais une valeur de 0,8 et/ou que le liant contient ou est composé d'un liant hydraulique, plus précisément du ciment.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'apport en liant se limite à 40 % en poids, idéalement 20 % en poids du mélange moulable, ou qu'est ajouté au mélange moulable un granulé d'appoint d'une granulosité adéquate maximale de 1,5 cm, le granulé d'appoint étant idéalement du sable et notamment en présence dans une proportion de 5 à 40 % en poids par rapport à l'ensemble du mélange moulable.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que le mélange moulable est secoué dans le moule et/ou aplati sur la surface exposée de ce dernier.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la surface du mélange moulable dans le moule est aspergée d'eau idéalement immédiatement après le coulage.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la surface du mélange moulable dans le moule, le cas échéant après avoir été aspergée d'eau, est pourvue d'un revêtement imperméable ou hydratant.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'élément d'alliage est utilisé pour la production du mélange moulable en petits morceaux, idéalement séparés par un écart central de 0,5 à 5 cm.
  11. Procédé selon au moins l'une des revendications 1 à 10, caractérisés en ce que l'élément d'alliage est versé sous forme de poussière ou de poudre, plus précisément avec une granulosité de moins de 0,1 mm.
  12. Procédé selon la revendication 10 et 11, caractérisé en ce que ledit élément d'alliage est utilisé autant en petits morceaux que sous forme de poussière ou de poudre, et qu'elle est présente selon un rapport pondéral entre 20:80 et 80:20.
  13. Procédé selon la revendication 10 et 12, caractérisé en ce que le moule est subdivisé par des barres surélevées en moules individuels et que le mélange moulable submerge les barres de façon à produire des corps moulés qui pourront être séparés en morceaux individuels une fois durcis.
EP20110168903 2010-07-08 2011-06-07 Procédé de fabrication d'ébauches en alliage Active EP2405025B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010031101A DE102010031101A1 (de) 2010-07-08 2010-07-08 Verfahren zur Herstellung von Legierungsformlingen

Publications (2)

Publication Number Publication Date
EP2405025A1 EP2405025A1 (fr) 2012-01-11
EP2405025B1 true EP2405025B1 (fr) 2015-04-22

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US (1) US20120167715A1 (fr)
EP (1) EP2405025B1 (fr)
DE (1) DE102010031101A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI126583B (fi) * 2014-03-31 2017-02-28 Outotec Finland Oy Menetelmä ja kantoaine pelkistimen kuten koksin kuljettamiseksi metallurgiseen uuniin ja kantoaineen tuotantomenetelmä
CN106216660B (zh) * 2016-08-30 2018-01-09 鄂州市金刚石技术研发中心 一种耐磨性好的金刚石磨具用胎体材料及制备方法
CN112958774B (zh) * 2021-01-21 2022-05-03 北京工业大学 表面复合陶瓷铁基材料及其制备方法

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Publication number Publication date
US20120167715A1 (en) 2012-07-05
DE102010031101A1 (de) 2012-01-12
EP2405025A1 (fr) 2012-01-11

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