DE102010007176A1 - Method for producing a refractory material from bauxite - Google Patents

Method for producing a refractory material from bauxite Download PDF

Info

Publication number
DE102010007176A1
DE102010007176A1 DE102010007176A DE102010007176A DE102010007176A1 DE 102010007176 A1 DE102010007176 A1 DE 102010007176A1 DE 102010007176 A DE102010007176 A DE 102010007176A DE 102010007176 A DE102010007176 A DE 102010007176A DE 102010007176 A1 DE102010007176 A1 DE 102010007176A1
Authority
DE
Germany
Prior art keywords
pellets
briquettes
bauxite
zone
sintered
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
DE102010007176A
Other languages
German (de)
Inventor
Christoph Dr. 48157 Beyer
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Polysius AG
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 Polysius AG filed Critical Polysius AG
Priority to DE102010007176A priority Critical patent/DE102010007176A1/en
Priority to BRPI1101777A priority patent/BRPI1101777A8/en
Priority to GB1102033.6A priority patent/GB2477848B/en
Priority to CN2011100405663A priority patent/CN102190504A/en
Publication of DE102010007176A1 publication Critical patent/DE102010007176A1/en
Ceased legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/101—Refractories from grain sized mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/6261—Milling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62625—Wet mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
    • C04B35/62655—Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62695—Granulation or pelletising
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
    • C04B2235/661—Multi-step sintering
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/95—Products characterised by their size, e.g. microceramics

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)
  • Fireproofing Substances (AREA)

Abstract

Beim erfindungsgemäßen Verfahren zur Herstellung eines Feuerfestmaterials aus Bauxit werden folgende Verfahrensschritte durchgeführt: a. Mahlen eines Bauxit enthaltenden Ausgangsmaterials auf eine Feinheit von d90 = 50 μm, b. Formen oder Pressen des zerkleinerten Materials unter Zugabe von Flüssigkeit zu Pellets oder Briketts, c. Aufgeben der Pellets oder Briketts in Ofen, wo die Pellets oder Briketts in einer Vorwärm- und/oder Calcinierzone vorgewärmt und/oder calciniert, in einer Sinterzone gesintert und in einer Kühlzone gekühlt werden.In the method according to the invention for producing a refractory material from bauxite, the following method steps are carried out: a. Milling a bauxite-containing starting material to a fineness of d90 = 50 μm, b. Molding or crushing the crushed material with addition of liquid to pellets or briquettes, c. Placing the pellets or briquettes in an oven where the pellets or briquettes are preheated and / or calcined in a preheating and / or calcining zone, sintered in a sintering zone and cooled in a cooling zone.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Feuerfestrohstoffs aus Bauxit, eine Anlage zur Durchführung dieses Verfahrens und einen Feuerfestrohstoff aus Bauxit, welcher durch dieses Verfahren erhältlich ist.The invention relates to a process for the production of a refractory raw material from bauxite, a plant for carrying out this process and a refractory raw material from bauxite, which is obtainable by this process.

Bauxithaltiges Ausgangsmaterial, wie beispielsweise Bauxiterz, kann je nach Herstellungsverfahren für sehr unterschiedliche Produkte verwendet werden. In der DE 36 17 340 A1 wird ein Stützmittel auf der Basis von Bauxit beschrieben, das beispielsweise bei der hydraulischen Rissbildung von unterirdischen Formationen zur Verbesserung der Öl- und Gasgewinnung verwendet wird. Das dort beschriebene Stützmittel zeichnet sich durch eine sehr hohe Permeabilität bei Formationsdrücken, eine sehr hohe Druckfestigkeit, ein niedriges spezifisches Gewicht und eine gute Säurebeständigkeit aus.Bauxite-containing starting material, such as bauxite ore, can be used for very different products, depending on the manufacturing process. In the DE 36 17 340 A1 describes a bauxite-based proppant used, for example, in hydraulic fracturing of subterranean formations to improve oil and gas production. The proppant described therein is characterized by a very high permeability at formation pressures, a very high compressive strength, a low specific gravity and a good acid resistance.

Dieses Ausgangsmaterial kann aber beispielsweise auch zur Herstellung von Feuerfestbauxit verwendet werden, das beispielsweise als Auskleidungsmaterial von Industrieöfen zur Anwendung kommt.However, this starting material can also be used, for example, for the production of refractory bauxite, which is used, for example, as a lining material for industrial furnaces.

Der Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren sowie eine Vorrichtung zur Herstellung eines Feuerfestmaterials aus Bauxit anzugeben, wobei das entstehende Feuerfestmaterial sich durch eine hohe Dichte und eine geringe Porosität auszeichnet.The invention is based on the object of specifying a method and an apparatus for producing a refractory material from bauxite, wherein the resulting refractory material is characterized by a high density and low porosity.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale der Ansprüche 1 und 10 gelöst.According to the invention, this object is solved by the features of claims 1 and 10.

Beim erfindungsgemäßen Verfahren zur Herstellung eines Feuerfestrohstoffs aus Bauxit werden folgende Verfahrensschritte durchgeführt:

  • a. Mahlen eines Bauxit enthaltenden Ausgangsmaterials auf eine Feinheit von d90 50 μm,
  • b. Formen oder Pressen des zerkleinerten Materials unter Zugabe von Flüssigkeit zu Pellets oder Briketts,
  • c. Aufgeben der Pellets oder Briketts in einen Ofen, wo die Pellets oder Briketts in einer Vorwärm- und/oder Calcinierzone vorgewärmt und/oder calciniert, in einer Sinterzone gesintert und in einer Kühlzone gekühlt werden.
In the method according to the invention for producing a refractory raw material from bauxite, the following method steps are carried out:
  • a. Grinding a bauxite-containing starting material to a fineness of d 90 50 μm,
  • b. Shaping or pressing the comminuted material with the addition of liquid to pellets or briquettes,
  • c. Placing the pellets or briquettes in an oven where the pellets or briquettes are preheated and / or calcined in a preheating and / or calcining zone, sintered in a sintering zone and cooled in a cooling zone.

Die erfindungsgemäße Anlage zur Durchführung dieses Verfahrens besteht im Wesentlichen aus

  • a. einer Mühle zum Mahlen eines Bauxit enthaltenden Ausgangsmaterials auf eine Feinheit von d90 = 50 μm,
  • b. einer Pelletier- und/oder Brikettiereinrichtung zum Formen oder Pressen des zerkleinerten Materials unter Zugabe von Flüssigkeit zu Pellets oder Briketts und
  • c. einem Ofen mit wenigstens einer Vorwämer und/oder Calcinierzone, einer Sinterzone und einer Kühlzone zur Wäremebehandlung der Pellets oder Briketts. Unter der Feinheit von d90 = 50 μm ist eine Feinheit zu verstehen, bei der wenigstens 90% des Ausgangsmaterials eine Korngröße von = 50 μm aufweist.
The system according to the invention for carrying out this method consists essentially of
  • a. a mill for grinding a bauxite-containing starting material to a fineness of d 90 = 50 μm,
  • b. a pelleting and / or Brikettiereinrichtung for forming or pressing the crushed material with the addition of liquid to pellets or briquettes and
  • c. an oven having at least one prewinter and / or calcining zone, a sintering zone and a cooling zone for heat treating the pellets or briquettes. The fineness of d 90 = 50 μm is to be understood as a fineness in which at least 90% of the starting material has a particle size of = 50 μm.

Üblicherweise erfolgt die Sinterung von Bauxit in Drehrohröfen. Bei den der Erfindung zugrundeliegenden Versuchen hat sich jedoch gezeigt, dass sich durch den Einsatz eines Ofens, der eine Vorwämer und/oder Calcinierzone, eine Sinterzone und eine Kühlzone umfasst, wie dies beispielsweise bei einem Schachtofen der Fall ist, ein Feuerfestmaterial mit einer höheren Dichte und einer geringeren Porosität erhalten lässt. Dies ist hauptsächlich darauf zurückzuführen, dass die mechanische Beanspruchung der Pellets/Briketts in diesem Ofentyp wesentlich geringer als in einem Drehrohrofen ist. Gerade im Drehrohrofen werden die relativ empfindlichen Briketts leicht zerstört, sodass die Sinterung nicht im gewünschten Maße durchgeführt werden kann. Der Schachtofen hat gegenüber dem Drehrohrofen außerdem noch den Vorteil, dass er weniger Energie zur Herstellung benötigt. Eine zusätzliche Anlage zur Kühlung der gesinterten Pellets/Briketts wird ebenfalls eingespart. Darüber hinaus wird der Verlust an Material über den Gasweg, der beim Drehrohrofen leicht 30% des Aufgabemassenstroms betragen kann, minimiert oder gänzlich vermieden, was einen weiteren energetischen und ökonomischen Vorteil bedingt.The sintering of bauxite usually takes place in rotary kilns. In the experiments on which the invention is based, it has been found, however, that the use of a furnace comprising a forwarder and / or calcining zone, a sintering zone and a cooling zone, as is the case for example with a shaft furnace, results in a refractory material with a higher density and a lower porosity. This is mainly due to the fact that the mechanical stress of the pellets / briquettes in this type of furnace is much lower than in a rotary kiln. Especially in rotary kilns, the relatively sensitive briquettes are easily destroyed, so that the sintering can not be performed to the desired extent. The shaft furnace also has the advantage over the rotary kiln that it requires less energy for production. An additional system for cooling the sintered pellets / briquettes is also saved. In addition, the loss of material via the gas path, which can easily be 30% of the feed mass flow in the rotary kiln, minimized or completely avoided, which requires a further energy and economic advantage.

Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further embodiments of the invention are the subject of the dependent claims.

Gemäß einer bevorzugten Ausgestaltung der Erfindung werden die Pellets oder Briketts bei Temperaturen von mehr als 1500°C im Schachtofen gesintert. Zweckmäßigerweise werden die Pellets vorher mit einem Durchmesser von 7 mm bis 50 mm geformt. Werden aus dem zerkleinerten Material Briketts gepresst, sollten diese zweckmäßigerweise eine Länge oder einen Durchmesser von 7 mm bis 80 mm aufweisen.According to a preferred embodiment of the invention, the pellets or briquettes are sintered at temperatures of more than 1500 ° C in the shaft furnace. Conveniently, the pellets are previously formed with a diameter of 7 mm to 50 mm. If briquettes are pressed from the comminuted material, these should expediently have a length or a diameter of 7 mm to 80 mm.

Weiterhin kann es hilfreich sein, wenn dem zerkleinerten Ausgangsmaterial beim Formen der Pellets oder beim Pressen der Briketts ein Agglomerationshilfsmittel beigemischt wird, damit die Form beim Sintern besser erhalten wird. Um die Stabilität der Pellets/Briketts weiter zu erhöhen, kann das zerkleinerte Material vor und/oder nach dem Mahlvorgang erhitzt und wenigstens teilweise entwässert werden.Furthermore, it may be helpful if an agglomeration aid is added to the comminuted starting material during the molding of the pellets or during the pressing of the briquettes so that the mold is better preserved during sintering. In order to further increase the stability of the pellets / briquettes, the comminuted material may be heated before and / or after the grinding operation and at least partially dehydrated.

Das entstehende Feuerfestmaterial weist eine Porosität von weniger als 10%, vorzugsweise eine Porosität von weniger als 6%, auf. Die Porosität stellt dabei das Verhältnis des Hohlraumvolumens zum Gesamtvolumen der gesinterten Pellets/Briketts dar.The resulting refractory material has a porosity of less than 10%, preferably a porosity of less than 6%. The Porosity represents the ratio of the void volume to the total volume of the sintered pellets / briquettes.

Weiterhin können die gesinterten Pellets/Briketts eine Dichte von wenigstens 3.3 g/cm3, vorzugsweise eine Dichte von mehr als 3.4 g/cm3, aufweisen. Die Dichteangaben beziehen sich auf eine Messung mit Hilfe eines sogenannten Quecksilberpyknometers.Furthermore, the sintered pellets / briquettes may have a density of at least 3.3 g / cm 3 , preferably a density of more than 3.4 g / cm 3 . The density data refer to a measurement using a so-called mercury pycnometer.

Weitere Vorteile und Ausgestaltungen der Erfindung werden im Folgenden anhand der Beschreibung und der Zeichnung näher erläutert.Further advantages and embodiments of the invention will be explained in more detail below with reference to the description and the drawing.

In der Zeichnung ist eine Anlage zur Herstellung eines Feuerfestrohstoffs aus Bauxit schematisch dargestellt.In the drawing, a plant for the production of a refractory raw material from bauxite is shown schematically.

Die Anlage besteht im Wesentlichen aus einer Mühle 1 zum Mahlen eines Bauxit enthaltenden Ausgangsmaterials 2, einer Pelletier- und/oder Brikettiereinrichtung 3 und einem Ofen 4, mit wenigstens einer Vorwämer und/oder Calcinierzone 4', einer Sinterzone 4'' und einer Kühlzone 4'''. Der Ofen 4 wird vorzugsweise durch einen Schachtofen gebildet, kann aber beispielsweise auch als Etagenofen ausgebildet werden. Bei dem zu mahlenden Ausgangsmaterial 2 handelt es sich insbesondere um uncalciniertes Bauxiterz, welches eventuell im Vorfeld weiteren Aufbereitungsschritten, wie z. B. einem Waschprozess, unterzogen werden kann.The plant consists essentially of a mill 1 for grinding a bauxite-containing starting material 2 , a pelleting and / or Brikettiereinrichtung 3 and a stove 4 , with at least one forwarder and / or calcining zone 4 ' , a sintering zone 4 '' and a cooling zone 4 ''' , The oven 4 is preferably formed by a shaft furnace, but may for example be designed as a multi-level furnace. In the starting material to be ground 2 it is in particular uncalcined Bauxiterz, which may be in advance of further processing steps, such. B. a washing process can be subjected.

Die Mühle 1 ist so ausgebildet, dass das Ausgangsmaterial 2 auf eine Feinheit von d90 = 50 μm gemahlen werden kann. In der Pelletier- und/oder Brikettiereinrichtung 3 wird das zerkleinerte Material 2' unter Zugabe von Flüssigkeit 6 zu Pellets 7 oder Briketts 8 geformt bzw. gepresst. Zur Unterstützung der Formgebung kann als Flüssigkeit 6 Wasser und/oder Öl bzw. ein Ölgemisch verwendet werden. Zur Formung der Pellets 7 werden wenigstens 10% Flüssigkeit zugegeben. Beim Pressen von Briketts 8 sind wenigstens 3% Flüssigkeit zweckmäßig. Zur Erleichterung der Formung und/oder zur Erhaltung der Form der Pellets 7 bzw. Briketts 8 kann der Pelletier- und/oder Brikettiereinrichtung 3 neben der Flüssigkeit 6 weiterhin ein geeignetes Agglomerationshilfsmittel 5, wie beispielsweise Phosphorsäure, zugegeben werden.The mill 1 is designed so that the starting material 2 can be ground to a fineness of d 90 = 50 microns. In the pelleting and / or briquetting 3 becomes the shredded material 2 ' with the addition of liquid 6 to pellets 7 or briquettes 8th molded or pressed. To support the shaping can be used as a liquid 6 Water and / or oil or an oil mixture can be used. For shaping the pellets 7 At least 10% liquid is added. When pressing briquettes 8th At least 3% of liquid is expedient. To facilitate the formation and / or preservation of the shape of the pellets 7 or briquettes 8th can the pelleting and / or Brikettiereinrichtung 3 next to the liquid 6 furthermore a suitable agglomeration aid 5 , such as phosphoric acid, are added.

Die Pelletier- und Brikettiereinrichtung 3 ist so eingestellt, dass das zerkleinerte Material 2' auf eine Größe mit einem Durchmesser von 6 mm bis 50 mm pelletiert wird. Werden Briketts gepresst, sollte deren Länge bzw. deren Durchmesser vorzugsweise 7 mm bis 80 mm betragen.The pelleting and briquetting device 3 is set so that the crushed material 2 ' is pelleted to a size with a diameter of 6 mm to 50 mm. If briquettes are pressed, their length or their diameter should preferably be 7 mm to 80 mm.

Die Pellets 7 bzw. Briketts 8 werden anschließend dem Ofen 4 von oben aufgegeben, durchwandern anschließend die Vorwämer und/oder Calcinierzone 4', die Sinterzone 4'' und die Kühlzone 4'''.The pellets 7 or briquettes 8th then the oven 4 abandoned from above, then walk through the forwarder and / or calcination zone 4 ' , the sintering zone 4 '' and the cooling zone 4 ''' ,

Am unteren Ende werden die gesinterten Pellets bzw. gesinterten Briketts als Feuerfestrohstoff 9 abgezogen, welcher eine Porosität von weniger als 10%, vorzugsweise eine Porosität von weniger als 6%, aufweist. Darüber hinaus weist es eine Dichte von wenigstens 3.3 g/cm3, vorzugsweise ein Dichte von mehr als 3.4 g/cm3, auf. Dies lässt sich insbesondere dadurch erreichen, dass die Pellets 7 bzw. Briketts 8 im Ofen 4 bei Temperaturen oberhalb von 1500°C gesintert werden können, ohne dass dabei die Struktur der Pellets bzw. Briketts zerstört wird.At the bottom, the sintered pellets or sintered briquettes are used as a refractory raw material 9 which has a porosity of less than 10%, preferably a porosity of less than 6%. In addition, it has a density of at least 3.3 g / cm 3 , preferably a density of more than 3.4 g / cm 3 . This can be achieved in particular by the fact that the pellets 7 or briquettes 8th in the oven 4 can be sintered at temperatures above 1500 ° C, without destroying the structure of the pellets or briquettes.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 3617340 A1 [0002] DE 3617340 A1 [0002]

Claims (10)

Verfahren zur Herstellung eines Feuerfestrohstoffs aus Bauxit mit folgenden Verfahrensschritten: a. Mahlen eines Bauxit enthaltenden Ausgangsmaterials (2) auf eine Feinheit von d90 = 50 μm, b. Formen oder Pressen des zerkleinerten Materials (2') unter Zugabe von Flüssigkeit (6) zu Pellets (7) oder Briketts (8), c. Aufgeben der Pellets (7) oder Briketts (8) in einen Ofen (4), wo die Pellets oder Briketts in einer Vorwärm- und/oder Calcinierzone (4') vorgewärmt und/oder calciniert, in einer Sinterzone (4'') gesintert und in einer Kühlzone (4''') gekühlt werden.Process for the production of a refractory raw material from bauxite with the following process steps: a. Milling a bauxite-containing starting material ( 2 ) to a fineness of d 90 = 50 μm, b. Molding or pressing the crushed material ( 2 ' ) with the addition of liquid ( 6 ) to pellets ( 7 ) or briquettes ( 8th c. Giving up the pellets ( 7 ) or briquettes ( 8th ) in a furnace ( 4 ), where the pellets or briquettes in a preheating and / or calcining zone ( 4 ' ) preheated and / or calcined, in a sintering zone ( 4 '' ) sintered and in a cooling zone ( 4 ''' ) are cooled. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die gesinterten Pellets (7') oder Briketts (8') eine Dichte von wenigstens 3.3 g/cm3, vorzugsweise eine Dichte von mehr als 3.4 g/cm3, aufweisen.Process according to claim 1, characterized in that the sintered pellets ( 7 ' ) or briquettes ( 8th' ) have a density of at least 3.3 g / cm 3 , preferably a density of more than 3.4 g / cm 3 . Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die gesinterten Pellets (7') oder Briketts (8') eine Porosität von weniger als 10%, vorzugsweise eine Porosität von weniger als 6%, aufweisen.Process according to claim 1, characterized in that the sintered pellets ( 7 ' ) or briquettes ( 8th' ) have a porosity of less than 10%, preferably a porosity of less than 6%. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Pellets (7) oder Briketts (8) bei Temperaturen von mehr als 1500°C im Schachtofen (4) gesintert werden.Process according to claim 1, characterized in that the pellets ( 7 ) or briquettes ( 8th ) at temperatures of more than 1500 ° C in the shaft furnace ( 4 ) are sintered. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Pellets (7) mit einem Durchmesser von 6 mm bis 50 mm geformt werden.Process according to claim 1, characterized in that the pellets ( 7 ) are formed with a diameter of 6 mm to 50 mm. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass aus dem zerkleinerten Material Briketts (8) von einer Länge oder einem Durchmesser von 7 mm bis 80 mm gepresst werden.A method according to claim 1, characterized in that from the crushed material briquettes ( 8th ) are pressed from a length or a diameter of 7 mm to 80 mm. Verfahren nach wenigsten einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass dem zerkleinerten Material beim Formen der Pellets (7) oder beim Pressen der Briketts (8) wenigstens ein Agglomerationshilfsmittel (5) beigemischt wird.Method according to at least one of the preceding claims, characterized in that the comminuted material during molding of the pellets ( 7 ) or when pressing the briquettes ( 8th ) at least one agglomeration aid ( 5 ) is added. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das zerkleinerte Material (2') vor und/oder nach dem Mahlvorgang erhitzt und wenigstens teilweise entwässert wird.Method according to claim 1, characterized in that the comminuted material ( 2 ' ) is heated before and / or after the grinding process and at least partially dehydrated. Feuerfestmaterial (11) aus Bauxit, erhältlich durch ein Verfahren nach einem oder mehreren der vorangegangenen Ansprüche, wobei das Feuerfestmaterial eine Porosität von weniger als 10%, vorzugsweise eine Porosität von weniger als 6%, aufweist.Refractory material ( 11 bauxite obtainable by a process according to one or more of the preceding claims, wherein the refractory material has a porosity of less than 10%, preferably a porosity of less than 6%. Anlage zur Durchführung des Verfahrens nach Anspruch 1, mit wenigstens a. einer Mühle (1) zum Mahlen eines Bauxit enthaltenden Ausgangsmaterials (2) auf eine Feinheit von d90 = 50 μm, b. einer Pelletier- und/oder Brikettiereinrichtung (3) zum Formen oder Pressen des zerkleinerten Materials unter Zugabe von Flüssigkeit zu Pellets (7) oder Briketts (8) und c. einem Ofen (4) mit wenigstens einer Vorwämer und/oder Calcinierzone (4'), eine Sinterzone (4'') und einer Kühlzone (4''') zur Wäremebehandlung der Pellets (7) oder Briketts (8).Plant for carrying out the method according to claim 1, with at least a. a mill ( 1 ) for milling a bauxite-containing starting material ( 2 ) to a fineness of d 90 = 50 μm, b. a pelleting and / or briquetting device ( 3 ) for molding or pressing the comminuted material with the addition of liquid to pellets ( 7 ) or briquettes ( 8th ) and c. an oven ( 4 ) with at least one forwarder and / or calcining zone ( 4 ' ), a sintering zone ( 4 '' ) and a cooling zone ( 4 ''' ) for heat treatment of the pellets ( 7 ) or briquettes ( 8th ).
DE102010007176A 2010-02-08 2010-02-08 Method for producing a refractory material from bauxite Ceased DE102010007176A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE102010007176A DE102010007176A1 (en) 2010-02-08 2010-02-08 Method for producing a refractory material from bauxite
BRPI1101777A BRPI1101777A8 (en) 2010-02-08 2011-02-07 PROCESS AND INSTALLATION FOR THE PRODUCTION OF A FIREPROOF MATERIAL FROM BAUXITE AS WELL AS THE USE OF BAUXITE PRODUCT AS A FIREPROOF MATERIAL
GB1102033.6A GB2477848B (en) 2010-02-08 2011-02-07 Process for the production of a porous material from bauxite
CN2011100405663A CN102190504A (en) 2010-02-08 2011-02-09 Method and equipment for producing refractory material from bauxite and application of the product as refractory material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010007176A DE102010007176A1 (en) 2010-02-08 2010-02-08 Method for producing a refractory material from bauxite

Publications (1)

Publication Number Publication Date
DE102010007176A1 true DE102010007176A1 (en) 2011-08-11

Family

ID=43836280

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102010007176A Ceased DE102010007176A1 (en) 2010-02-08 2010-02-08 Method for producing a refractory material from bauxite

Country Status (4)

Country Link
CN (1) CN102190504A (en)
BR (1) BRPI1101777A8 (en)
DE (1) DE102010007176A1 (en)
GB (1) GB2477848B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079243A (en) * 1959-10-19 1963-02-26 Norton Co Abrasive grain
DE2948584A1 (en) * 1978-12-13 1980-06-26 Carborundum Co SPHERICAL SINTERCERAMIC PELLETS AND METHOD FOR THEIR PRODUCTION
DE3617340A1 (en) 1985-05-23 1986-11-27 Comalco Aluminium Ltd., Melbourne MATERIAL SUITABLE FOR SUPPORT AND METHOD FOR THE PRODUCTION THEREOF
US20060081371A1 (en) * 2004-09-14 2006-04-20 Carbo Ceramics Inc. Sintered spherical pellets

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB315856A (en) * 1928-07-21 1930-07-03 Hartford Empire Co Improvements in or relating to the manufacture of refractory articles
NO117228B (en) * 1965-07-26 1969-07-14 Carborundum Co
NZ223964A (en) * 1987-04-03 1991-02-26 Comalco Alu Filter containing sintered ultrafine bauxite particles for use with fluids at high temperatures
US20070023187A1 (en) * 2005-07-29 2007-02-01 Carbo Ceramics Inc. Sintered spherical pellets useful for gas and oil well proppants
WO2009134159A1 (en) * 2008-04-28 2009-11-05 Schlumberger Canada Limited Strong low density ceramics
CN101691486A (en) * 2009-09-21 2010-04-07 贵州鑫益能陶粒支撑剂有限公司 Porcelain granule propping agent with ultra strength and super-high density and manufacturing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079243A (en) * 1959-10-19 1963-02-26 Norton Co Abrasive grain
DE2948584A1 (en) * 1978-12-13 1980-06-26 Carborundum Co SPHERICAL SINTERCERAMIC PELLETS AND METHOD FOR THEIR PRODUCTION
DE3617340A1 (en) 1985-05-23 1986-11-27 Comalco Aluminium Ltd., Melbourne MATERIAL SUITABLE FOR SUPPORT AND METHOD FOR THE PRODUCTION THEREOF
US20060081371A1 (en) * 2004-09-14 2006-04-20 Carbo Ceramics Inc. Sintered spherical pellets

Also Published As

Publication number Publication date
GB2477848A (en) 2011-08-17
CN102190504A (en) 2011-09-21
BRPI1101777A2 (en) 2012-07-31
GB2477848B (en) 2012-07-04
GB201102033D0 (en) 2011-03-23
BRPI1101777A8 (en) 2015-04-28

Similar Documents

Publication Publication Date Title
EP2867312B1 (en) Process and apparatus for producing hybrid carbon black particles
DE1918834A1 (en) Isotropic graphite of high density
DE3515162A1 (en) METHOD FOR PRODUCING A SEALED CORDIERIT
DE102012200967A1 (en) Polyurethane cold box bonded feeder and polyurethane cold box bonded feeder component used in foundry industry, contain calcined kieselguhr, hardened polyurethane cold box resin and optionally fiber material and oxidizable metal
DE102006003295A1 (en) Core for supporting granules and process for its production
DE102009023928A1 (en) Process for producing an agglomerate
WO2019015708A1 (en) Building material granulate, method for producing a building material granulate on the basis of mineral grains and use of same
DE2438841A1 (en) PROCESS FOR MANUFACTURING STEEL POWDER WITH HIGH APPEARANCE DENSITY
DE1903052A1 (en) Process for the production and heat treatment of moldings from ores of all kinds
DE2200002B2 (en) Unfired heterogeneous clunel cell mixture
DE2817176C2 (en) Process for the production of a filter material with a large specific surface
DE102010007176A1 (en) Method for producing a refractory material from bauxite
DE2533862C2 (en) Use of agglomerates made from refractory individual particles
DE102009055723A1 (en) Alkali-resistant alkaline earth-aluminum thermal insulation material, process for its preparation and its use
DE102018123115A1 (en) Process and plant for processing material containing cement stone
DE1571510A1 (en) Process for the production of construction parts from difficult to melt material
DE2819038A1 (en) Sintered magnesite or dolomite prodn. - from minerals which are crushed and pre-roasted prior to briquetting and sintering
DE102017110558A1 (en) Method and apparatus for producing glass batch pellets
DE102015109821B4 (en) Process for the production of carbon bodies
DE1542584C (en) Process for the production of agglomerates from water and / or other liquids and optionally additives containing starting material
DE2251606A1 (en) PROCESS FOR MANUFACTURING A SOLID FUEL FOR ORE REDUCTION
DE1671382C3 (en)
DE102004048804B4 (en) Agglomerate brick, for use in furnaces, is composed of aluminum oxide as a fine dust together with a bonding agent and a hardening accelerator
DE102016112039A1 (en) Plate, in particular cover plate for molten metal, and method for producing the plate and its use
DE2044885C (en) Process for the production of chrome ore grains suitable for refractory purposes

Legal Events

Date Code Title Description
R082 Change of representative

Representative=s name: RA U. PA VOLKMAR TETZNER; PA MICHAEL TETZNER; , DE

Representative=s name: RA U. PA VOLKMAR TETZNER; PA MICHAEL TETZNER; RA T

R081 Change of applicant/patentee

Owner name: THYSSENKRUPP POLYSIUS AG, DE

Free format text: FORMER OWNER: POLYSIUS AG, 59269 BECKUM, DE

Effective date: 20120118

Owner name: THYSSENKRUPP RESOURCE TECHNOLOGIES GMBH, DE

Free format text: FORMER OWNER: POLYSIUS AG, 59269 BECKUM, DE

Effective date: 20120118

Owner name: THYSSENKRUPP RESOURCE TECHNOLOGIES AG, DE

Free format text: FORMER OWNER: POLYSIUS AG, 59269 BECKUM, DE

Effective date: 20120118

R082 Change of representative

Representative=s name: RA U. PA VOLKMAR TETZNER; PA MICHAEL TETZNER; , DE

Effective date: 20120118

Representative=s name: RECHTSANW. UND PAT.-ANW. DR.-ING. DR.JUR. VOLK, DE

Effective date: 20120118

R082 Change of representative

Representative=s name: RECHTSANW. UND PAT.-ANW. DR.-ING. DR.JUR. VOLK, DE

R081 Change of applicant/patentee

Owner name: THYSSENKRUPP RESOURCE TECHNOLOGIES GMBH, DE

Free format text: FORMER OWNER: THYSSENKRUPP POLYSIUS AG, 59269 BECKUM, DE

Effective date: 20130626

Owner name: THYSSENKRUPP RESOURCE TECHNOLOGIES GMBH, DE

Free format text: FORMER OWNER: THYSSENKRUPP RESOURCE TECHNOLOGIES AG, 59269 BECKUM, DE

Effective date: 20130808

R082 Change of representative

Representative=s name: RECHTSANW. UND PAT.-ANW. DR.-ING. DR.JUR. VOLK, DE

Effective date: 20130626

Representative=s name: RECHTSANW. UND PAT.-ANW. DR.-ING. DR.JUR. VOLK, DE

Effective date: 20130808

R002 Refusal decision in examination/registration proceedings
R003 Refusal decision now final

Effective date: 20131127