EP1046721A1 - Method of consolidating powdery alloying additives for steelmaking - Google Patents

Method of consolidating powdery alloying additives for steelmaking Download PDF

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Publication number
EP1046721A1
EP1046721A1 EP00890122A EP00890122A EP1046721A1 EP 1046721 A1 EP1046721 A1 EP 1046721A1 EP 00890122 A EP00890122 A EP 00890122A EP 00890122 A EP00890122 A EP 00890122A EP 1046721 A1 EP1046721 A1 EP 1046721A1
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Prior art keywords
weight
cement
mixed
water
added
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EP00890122A
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German (de)
French (fr)
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Eduard Buzetzki
Franz Howorka
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/005—Manufacture of stainless steel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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

Definitions

  • the invention relates to a method for solidification powdery aggregates or alloys according to Preamble of claim 1.
  • the powdery aggregates and alloys are common solidified into pellets or pillows under high pressure.
  • JP 58199697 A proposed the manufacture of pellet thermosetting resins or water glass use.
  • JP 58171538 A has already been used to manufacture Pellets with natural chrome sand are proposed as cement Binder to use, such pellets to be added in one Blast furnace are provided.
  • the aim of the invention is to provide a process for the production of Propose pellets that are particularly suitable for manufacturing of stainless steel sheets.
  • the proposed measures will be simple a very secure setting of the powdery aggregate and Alloys ensured. There is only a small one Energy required, which is essentially due to the Mix the binder with the alloy or aggregates is conditional. Due to the specified composition of the Pellets are particularly suitable for the production of Qualities for the production of stainless steel sheets.
  • binders also results in Advantage that the molded parts produced in this way have a corresponding have high abrasion resistance, or the abrasion resistance can be and the strength of the molded part according to the set respective needs or customer requirements. At the molded parts produced according to the proposed method can therefore be a dust load when handling and avoid loss of alloys as much as possible.
  • the production of the molded parts from the one made with binder staggered pasty mass can according to the from the Art and concrete block production known processes take place such as in the manufacture of shaped stones for fastening of paths and. Like. Be used.
  • Cement as a binder can be added simply by adding Bring water into a pasty state without getting into it Significant need for energy supply results.
  • results from the use of cement and / or silicate also the advantage that the calcium content of the Cement or the silicates, the melt of at most existing residual impurities such as sulfur and Get rid of phosphorus.
  • silicates provide one excellent slag generator.
  • a mass consisting of 25% by weight of cement and 65% by weight of nickel oxide powder was mixed with 10 wt.% water and the so The pasty mass produced is poured into a mold and dried calmly.
  • the shaped body thus obtained was distinguished high strength and high abrasion resistance and can be easily handled and introduced into a melt become.
  • a mass consisting of 15% by weight of cement, 10% by weight of silicate and 65% by weight of nickel oxide powder was mixed with 10% by weight of water and poured the pasty mass thus produced into a mold and left to dry.
  • the shaped body thus obtained drew high strength and high abrasion resistance out and can be easily handled and in one Melt are introduced.
  • a mass consisting of 25% by weight cement, 5% by weight dispersion (Acrylic dispersion) as an adhesion promoter and 60% by weight ferrochrome powder was mixed with 10% by weight of water and the thus prepared pasty mass poured into a mold and left to dry.
  • the molded body thus obtained as a high strength and a high abrasion resistance and can therefore easily handled and introduced into a melt.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Nickel oxide or ferrochromium powder consolidation comprises molding a slurry of the powder with cement, water and optionall silicate or a dispersion. Additive or alloying powders are consolidated by mixing with a hardenable pasty binder to form a slurry which is cast and allowed to set to mouldings for addition to a melt. The nickel oxide powder is mixed with 5-40 (preferably 25) wt.% cement and 5-20 (preferably 10) wt.% water to form a slurry, to which 3-15 wt.% silicate is optionally added prior to molding and drying. Alternatively ferrochromium powder is mixed with 5-40 (preferably 25) wt.% cement and 1-10 (preferably 5) wt.% dispersion with addition of 5-20 (preferably 10) wt.% water and the slurry is molded and dried.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Verfestigung pulverförmiger Zuschlags- oder Legierungsstoffe gemäß dem Oberbegriff des Anspruches 1.The invention relates to a method for solidification powdery aggregates or alloys according to Preamble of claim 1.

Bei der Herstellung von Stählen ergibt sich die Notwendigkeit Zuschlags- und Legierungsstoffe in eine Schmelze einzubringen, wobei diese Stoffe häufig als Pulver vorliegen. Um bei der Zugabe unerwünschte Reaktionen zu vermeiden, werden diese Zuschlags- und Legierungsstoffe in einem verfestigten Zustand der Schmelze zugesetzt.The need arises in the production of steels Adding aggregates and alloys to a melt, these substances are often in powder form. To when adding to avoid unwanted reactions, these surcharges and alloys in a solidified state added to the melt.

Häufig werden die pulverförmigen Zuschlags- und Legierungsstoffe unter hohem Druck zu Pelletts oder Kissen verfestigt.The powdery aggregates and alloys are common solidified into pellets or pillows under high pressure.

Dabei ergibt sich jedoch der Nachteil, dass diese Art der Verfestigung einen sehr hohen Energieaufwand erfordern und an die Verfestigungseinrichtung höchste Ansprüche im Hinblick auf Abrassion gestellt werden müssen. Außerdem erweisen sich die so hergestellten Pelletts als nicht besonders abriebfest, sodass erhebliche Verluste bei der Handhabung der Pelletts ergeben.However, there is the disadvantage that this type of solidification require a very high amount of energy and to the Hardening device highest demands with regard to Abrassion must be put. In addition, they prove pellets produced in this way are not particularly abrasion-resistant, so that considerable losses in handling the pellet result.

Weiters wurde auch schon vorgeschlagen bei de Herstellung der Pellets ein erhärtendes pastöses bindemittel zu verwenden. Dadurch wird eine sichere Abbindung der pulverförmigen Zuschlags- und Legierungsstoffe erreicht und es wird dadurch eine Verminderung des zur Herstellung der Pellets erforderlichen Energieaufwandes erreicht. Dabei wird meist Zement zur Bereitung des pastösen Bindemittels verwendet.Furthermore, it has also been proposed in the manufacture of the Pellets to use a hardening pasty binder. Thereby a secure setting of the powdery aggregate and alloying materials and it does a reduction in what is required to produce the pellets Energy expenditure reached. Usually cement is used Preparation of the pasty binder used.

Bisher wurden solche mit Zement gebundene Pellets aus Legierungs- und Zuschlagsstoffen verwendet, wie sie für die Stahlherstellung in Hochöfen verwendet werden. So beschreibt die DE 33 07 175 A ein Verfahren zur Herstellung von Pellets der eingangs erwähnten Art, die zum chargieren von Hochöfen verwendet werden.So far, such cement-bonded pellets made of alloy and aggregates used in steel making can be used in blast furnaces. So describes the DE 33 07 175 A a process for the production of pellets type mentioned at the beginning, used for charging blast furnaces become.

Weiters wurde durch die JP 58199697 A vorgeschlagen zur Herstellung von Pellets wärmehärtende Harze oder Wasserglas zu verwenden.Furthermore, JP 58199697 A proposed the manufacture of pellet thermosetting resins or water glass use.

Durch die JP 58171538 A wurde auch schon zur Herstellung von Pellets mit natürlichem Chromsand vorgeschlagen, Zement als Binder zu verwenden, wobei solche Pellets zur Zugabe in einem Hochofen vorgesehen sind.JP 58171538 A has already been used to manufacture Pellets with natural chrome sand are proposed as cement Binder to use, such pellets to be added in one Blast furnace are provided.

Ziel der Erfindung ist es, ein Verfahren zur Herstellung von Pellets vorzuschlagen, die sich insbesondere zur Herstellung von Nirosta-Blechen eignen.The aim of the invention is to provide a process for the production of Propose pellets that are particularly suitable for manufacturing of stainless steel sheets.

Erfindungsgemäß wird dies bei einem Verfahren der eingangs erwähnten Art durch die kennzeichnenden Merkmale des Anspruches 1 erreicht.According to the invention, this is the case of a method as mentioned in the introduction Kind by the characterizing features of the claim 1 reached.

Durch die vorgeschlagenen Maßnahmen wird auf einfache Weise eine sehr sicherer Abbindung der pulverförmigen Zuschlags- und Legierungsstoffe sichergestellt. Dabei ist nur ein geringer Energieeinsatz erforderlich, der im wesentlichen durch das Verrühren des Bindemittels mit den Legierungs- bzw. Zuschlagsstoffen bedingt ist. Durch die angegebene Zusammensetzung der Pellets eignen sich dies besonders für die Herstellung von Qualtäten zur Herstellung von Nirosta-Blechen.The proposed measures will be simple a very secure setting of the powdery aggregate and Alloys ensured. There is only a small one Energy required, which is essentially due to the Mix the binder with the alloy or aggregates is conditional. Due to the specified composition of the Pellets are particularly suitable for the production of Qualities for the production of stainless steel sheets.

Dies lässt sich auch mit einem Verfahren gemäß dem Anspruch 2 erreichen.This can also be done with a method according to claim 2 to reach.

Im Zusammenhang mit dem Verfahren nach dem Anspruch 2 ist es besonders vorteilhaft die Merkmale des Anspruches 3 vorzusehen.In connection with the method according to claim 2 it is to provide the features of claim 3 particularly advantageous.

Durch die Merkmale des Anspruches 3 ist es auch möglich nichtoxidische Zuschlags- und Legierungsstoffe, die sich nur schwer binden lassen, sicher zu Formteilen zu verarbeiten. Da nur relativ wenige Mengen an Dispersion zugesetzt zu werden brauchen, wird auch nur relativ wenig Kohlenstoff in die Schmelze eingetragen. Due to the features of claim 3, it is also possible non-oxidic Aggregates and alloys that are difficult can be bound, safely processed into molded parts. Because only relative few amounts of dispersion to be added need relatively little carbon in the Melt entered.

Durch die Verwendung von Bindemitteln ergibt sich auch der Vorteil, dass die so hergestellten Formteile eine entsprechend hohe Abrassionsfestigkeit aufweisen, bzw. es läßt sich die Abrassionsfestigkeit und die Festigkeit des Formteiles gemäß den jeweiligen Bedürfnissen bzw. Kundenwunsches einstellen. Bei den gemäß dem vorgeschlagenen verfahren hergestellten Formteilen läßt sich daher bei deren Handhabung eine Staubbelastung und Verlust an Legierungsstoffen sehr weitgehend vermeiden.The use of binders also results in Advantage that the molded parts produced in this way have a corresponding have high abrasion resistance, or the abrasion resistance can be and the strength of the molded part according to the set respective needs or customer requirements. At the molded parts produced according to the proposed method can therefore be a dust load when handling and avoid loss of alloys as much as possible.

Die Herstellung der Formteile aus der mit Bindemittel hergestellten versetzten pastösen Masse kann nach den aus der Kunst- und Betonsteinerzeugung bekannten Verfahren erfolgen, wie sie z.B. bei der Herstellung von Formsteinen zur Befestigung von Wegen und. dgl. verwendet werden.The production of the molded parts from the one made with binder staggered pasty mass can according to the from the Art and concrete block production known processes take place such as in the manufacture of shaped stones for fastening of paths and. Like. Be used.

Zement als Bindemittel lässt sich durch einfache Zugabe von Wasser in einen pastösen Zustand bringen, ohne dass sich ein Bedarf an Energiezufuhr in nennenswertem Ausmaß ergibt. Dabei ergibt sich bei der Verwendung von Zement und bzw. oder Silikat auch noch der Vorteil, dass durch den Kalziumgehalt des Zementes oder der Silikate dazu beträgt, die Schmelze von allenfalls vorhandenen Restverunreinigungen wie Schwefel und Phosphor zu befreien. Darüberhinaus stellen Silikate einen hervorragenden Schlackenbildner dar.Cement as a binder can be added simply by adding Bring water into a pasty state without getting into it Significant need for energy supply results. Here results from the use of cement and / or silicate also the advantage that the calcium content of the Cement or the silicates, the melt of at most existing residual impurities such as sulfur and Get rid of phosphorus. In addition, silicates provide one excellent slag generator.

Durch die Verwendung von Zement mit unterschiedlichen Qualitäten und Variation der zugesetzten Zementanteilen läßt sich die Abrassionsfestigkeit und die Festigkeit der hergestellten Formteile in weiten Grenzen an die jeweiligen Erfordernisse anpassen.By using cement with different qualities and variation of the added cement proportions Abrasion resistance and the strength of the manufactured Moldings within wide limits to the respective requirements to adjust.

Durch die Maßnahmen gemäß dem Anspruch 4 läßt sich auf einfache Weise eine sichere Benetzung der zu verfestigenden Partikel auf einfache Weise erreichen.By the measures according to claim 4 can be simple Way a safe wetting of the particles to be solidified reach in a simple way.

Beispiel 1:Example 1:

Eine Masse bestehend aus 25 Gew.% Zement und 65 Gew.% Nickeloxid-Pulver wurde mit 10 Gew.% Wasser angerührt und die so hergestellte pastöse Masse in eine Form gegossen und trocknen gelassen. Der so erhaltenen Formkörper zeichnete sich durch eine hohe Festigkeit und eine hohe Abrassionsfestigkeit aus und kann problemlos gehandhabt und in eine Schmelze eingebracht werden.A mass consisting of 25% by weight of cement and 65% by weight of nickel oxide powder was mixed with 10 wt.% water and the so The pasty mass produced is poured into a mold and dried calmly. The shaped body thus obtained was distinguished high strength and high abrasion resistance and can be easily handled and introduced into a melt become.

Beispiel 2:Example 2:

Eine Masse bestehend aus 15 Gew.% Zement, 10 Gew.% Silikat und 65 Gew.% Nickeloxid-Pulver wurde mit 10 Gew.% Wasser angerührt und die so hergestellte pastöse Masse in eine Form gegossen und trocknen gelassen. Der so erhaltenen Formkörper zeichnete sich durch eine hohe Festigkeit und eine hohe Abrassionsfestigkeit aus und kann problemlos gehandhabt und in eine Schmelze eingebracht werden.A mass consisting of 15% by weight of cement, 10% by weight of silicate and 65% by weight of nickel oxide powder was mixed with 10% by weight of water and poured the pasty mass thus produced into a mold and left to dry. The shaped body thus obtained drew high strength and high abrasion resistance out and can be easily handled and in one Melt are introduced.

Beispiel 3:Example 3:

Eine Masse bestehend aus 25 Gew.% Zement, 5 Gew.% Dispersion (Acryldispersion) als Haftvermittler und 60 Gew.% Ferrochrom-Pulver wurde mit 10 Gew.% Wasser angerührt und die so hergestellte pastöse Masse in eine Form gegossen und trocknen gelassen. Der so erhaltenen Formkörper wie eine hohe Festigkeit und eine hohe Abrassionsfestigkeit auf und kann daher problemlos gehandhabt und in eine Schmelze eingebracht werden.A mass consisting of 25% by weight cement, 5% by weight dispersion (Acrylic dispersion) as an adhesion promoter and 60% by weight ferrochrome powder was mixed with 10% by weight of water and the thus prepared pasty mass poured into a mold and left to dry. The molded body thus obtained as a high strength and a high abrasion resistance and can therefore easily handled and introduced into a melt.

Claims (4)

Verfahren zur Verfestigung pulverförmiger Zuschlags- oder Legierungsstoffe, insbesondere zur Herstellung von Stählen, wobei die pulverförmigen Zuschlags- oder Legierungsstoffe mit einem erhärtenden pastösen Bindemittel zu einem Brei verrührt und dieser in Formen eingebracht, insbesondere eingegossen, und zu Formteilen erhärten gelassen wird, die einer Schmelze zugegeben werden, dadurch gekennzeichnet, dass Nickeloxidpulver mit 5 bis 40 Gew.%, vorzugsweise 25 Gew.% Zement unter Beigabe von 5 bis 20%, vorzugsweise 10% Wasser, vermengt wird, wobei diesem Brei gegebenenfalls 3 bis 15 Gew.% Silikat zugesetzt ist, und in Formen eingebracht und getrocknet wird.Process for solidifying powdery aggregates or alloys, in particular for the production of steels, wherein the powdery aggregates or alloys are mixed with a hardening paste-like binder to form a paste and this is introduced into molds, in particular poured in, and is left to harden to form parts which melt are added, characterized in that nickel oxide powder is mixed with 5 to 40% by weight, preferably 25% by weight of cement with the addition of 5 to 20%, preferably 10% water, 3 to 15% by weight of silicate optionally being added to this slurry and is placed in molds and dried. Verfahren zur Verfestigung pulverförmiger Zuschlags- oder Legierungsstoffe, insbesondere zur Herstellung von Stählen, wobei die pulverförmigen Zuschlags- oder Legierungsstoffe mit einem erhärtenden pastösen Bindemittel zu einem Brei verrührt und dieser in Formen eingebracht, insbesondere eingegossen, und zu Formteilen erhärten gelassen wird, die einer Schmelze zugegeben werden, dadurch gekennzeichnet, dass Ferrochrom-Pulver mit 5 bis 40 Gew.%, vorzugsweise 25 Gew.% Zement und 1 bis 10 Gew.%, vorzugsweise 5 Gew.% Dispersion unter Zugabe von 5 bis 20 Gew.%, vorzugsweise 10 Gew.% Wasser vermengt wird und dieser Brei in Formen eingebracht und getrocknet wird.Process for solidifying powdery aggregates or alloys, in particular for the production of steels, wherein the powdery aggregates or alloys are mixed with a hardening paste-like binder to form a paste and this is introduced into molds, in particular poured in, and is left to harden to form parts which melt are added, characterized in that ferrochrome powder with 5 to 40% by weight, preferably 25% by weight of cement and 1 to 10% by weight, preferably 5% by weight of dispersion with addition of 5 to 20% by weight, preferably 10 % By weight of water is mixed and this paste is introduced into molds and dried. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass bei Verwendung von Ferrochrom als Legierungsstoff, dem Bindemittel eine Acryldispersion, zugesetzt wird.A method according to claim 2, characterized in that when using ferrochrome as an alloy, the binder, an acrylic dispersion is added. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Dispersion dem Wasser zugesetzt wird, bevor dieses mit den übrigen, im wesentlichen pulverförmigen Bestandteilen der Mischung vermengt wird.A method according to claim 2 or 3, characterized in that the dispersion is added to the water before it is mixed with the other, essentially powdery components of the mixture.
EP00890122A 1999-04-20 2000-04-18 Method of consolidating powdery alloying additives for steelmaking Withdrawn EP1046721A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT26399U 1999-04-20
AT0026399U AT3496U1 (en) 1999-04-20 1999-04-20 METHOD FOR STRENGTHENING POWDERED AGENTS AND ALLOYS

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105018826A (en) * 2015-07-24 2015-11-04 金川集团股份有限公司 Method for increasing direct recovery rate of nickel protoxide added in stainless steel smelting

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140217B (en) * 1956-11-09 1962-11-29 Union Carbide Corp Non-exothermic alloy additive for molten steel
DE1926404B1 (en) * 1969-05-23 1970-07-09 Kloeckner & Co Process for making alloy briquettes
JPS57188611A (en) * 1981-05-14 1982-11-19 Nippon Steel Corp Refining method for nickel stainless steel
DE3149013A1 (en) * 1981-12-10 1983-06-16 Wilhelm 2400 Lübeck Städing A process for producing mouldings from fine-grained raw materials for use in a shaft furnace
JPS58171538A (en) * 1982-04-02 1983-10-08 Kawasaki Steel Corp Method for producing chromium ore pellet from chromium sand
DE19602486C1 (en) * 1996-01-24 1997-06-12 Elkem Materials Briquette containing silicon-containing residues as an additive for metallurgical purposes and process for its production

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140217B (en) * 1956-11-09 1962-11-29 Union Carbide Corp Non-exothermic alloy additive for molten steel
DE1926404B1 (en) * 1969-05-23 1970-07-09 Kloeckner & Co Process for making alloy briquettes
JPS57188611A (en) * 1981-05-14 1982-11-19 Nippon Steel Corp Refining method for nickel stainless steel
DE3149013A1 (en) * 1981-12-10 1983-06-16 Wilhelm 2400 Lübeck Städing A process for producing mouldings from fine-grained raw materials for use in a shaft furnace
JPS58171538A (en) * 1982-04-02 1983-10-08 Kawasaki Steel Corp Method for producing chromium ore pellet from chromium sand
DE19602486C1 (en) * 1996-01-24 1997-06-12 Elkem Materials Briquette containing silicon-containing residues as an additive for metallurgical purposes and process for its production

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 034 (C - 150) 10 February 1983 (1983-02-10) *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 003 (C - 203) 7 January 1984 (1984-01-07) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105018826A (en) * 2015-07-24 2015-11-04 金川集团股份有限公司 Method for increasing direct recovery rate of nickel protoxide added in stainless steel smelting
CN105018826B (en) * 2015-07-24 2017-02-01 金川集团股份有限公司 Method for increasing direct recovery rate of nickel protoxide added in stainless steel smelting

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