DE19722035A1 - Reuse of especially silicon carbide-containing alumina-rich refractory rubble - Google Patents

Reuse of especially silicon carbide-containing alumina-rich refractory rubble

Info

Publication number
DE19722035A1
DE19722035A1 DE19722035A DE19722035A DE19722035A1 DE 19722035 A1 DE19722035 A1 DE 19722035A1 DE 19722035 A DE19722035 A DE 19722035A DE 19722035 A DE19722035 A DE 19722035A DE 19722035 A1 DE19722035 A1 DE 19722035A1
Authority
DE
Germany
Prior art keywords
fraction
refractory
grain size
casting compound
outbreak
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.)
Withdrawn
Application number
DE19722035A
Other languages
German (de)
Inventor
Klaus-Juergen Dr Ing Arlt
Hans Dipl Ing Koenig
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.)
Dillinger Huettenwerke AG
Original Assignee
Dillinger Huettenwerke 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 Dillinger Huettenwerke AG filed Critical Dillinger Huettenwerke AG
Priority to DE19722035A priority Critical patent/DE19722035A1/en
Publication of DE19722035A1 publication Critical patent/DE19722035A1/en
Withdrawn legal-status Critical Current

Links

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
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/132—Waste materials; Refuse; Residues
    • C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
    • 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
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/10—Eliminating iron or lime
    • 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
    • C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
    • 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
    • C04B35/6262—Milling of calcined, sintered clinker or 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
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0087—Uses not provided for elsewhere in C04B2111/00 for metallurgical applications
    • C04B2111/00887—Ferrous metallurgy
    • 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
    • C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
    • 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
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
    • 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
    • C04B2235/30—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
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
    • 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
    • C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
    • 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
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
    • 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
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
    • 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
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • 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
    • C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
    • 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
    • C04B2235/02—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
    • C04B2235/5463—Particle size distributions
    • 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
    • C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
    • C04B2235/726—Sulfur content
    • 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
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
    • C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1626—Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

A refractory rubble recycling method involves comminuting alumina-rich and preferably SiC-containing refractory rubble and using at least part of the particle size spectrum as a sprayable or castable for refractory lining production. Preferably, the comminuted rubble is separated into a fraction (a) of 0.5-2 mm particle size, a fraction (b) of greater particle size and a fraction (c) of smaller particle size. Alternatively, the comminuted rubble is separated into (d) fractions of less than 90 mu , 90-250 mu , 250-500 mu and 500-1000 mu particle size.

Description

Die Erfindung betrifft ein Verfahren zur Wiederverwertung eines Feuerfestausbruches.The invention relates to a method for recycling a refractory outbreak.

Es sind verschiedene solche Verfahren bekannt.Various such methods are known.

Nach der DE-OS 43 42 934 wird ein Feuerfestmaterial mit hohem SiO2-Anteil, insbesondere Silikaausbruch aus Glasschmelzanlagen und Koksbatterien, als Quarzsandersatz in einem Gemenge zur Glasherstellung verwendet.According to DE-OS 43 42 934, a refractory material with a high SiO 2 content, in particular silica outbreak from glass melting plants and coke batteries, is used as a quartz sand set in a batch for glass production.

In der Feuerfestindustrie ist die Wiederverwendung von Magnesitsteinen und -brocken sowie Schamottesteinen und -brocken bekannt.In the refractory industry is the reuse of magnesite stones and chunks as well Firebricks and chunks known.

Ebenfalls durch Benutzung bekannt ist die Verwendung von Feuerfestausbruch aus Dolo­ mitsteinen als Dolomitkalkersatz in Sinteranlagen.The use of Dolo refractory is also known from use mitstein as a substitute for dolomite limestone in sinter plants.

Feuerfestausbruch mit überwiegendem Anteil an Al2-O3, insbesondere SiC enthaltender Feuerfestausbruch, kann bisher mangels Verwertungsmöglichkeit nur auf Deponien endge­ lagert werden. Oft sind dabei die für Sonderabfall bestehenden Auflagen zu erfüllen.Refractory eruption with a predominant proportion of Al 2- O 3 , in particular SiC-containing refractory eruption, can hitherto only be disposed of in landfills due to the lack of recycling options. Often the requirements for hazardous waste have to be met.

Der Erfindung liegt die Aufgabe zugrunde, eine Möglichkeit zur Wiederverwertung von hochtonerdehaltigem Feuerfestausbruch zu finden und insbesondere von SiC enthaltendem Feuerfestausbruch.The invention has for its object a way of recycling to find refractory eruptions containing high alumina and in particular those containing SiC Refractory outbreak.

Gemäß der Erfindung ist vorgesehen, daß ein hochtonerdehaltiger Feuerfestausbruch zer­ kleinert wird und mindestens ein Teil des Kornspektrums als Spritzmasse oder Gießmasse zur Herstellung einer Feuerfest-Auskleidung verwendet wird.According to the invention it is provided that a high-alumina refractory outbreak is reduced and at least a part of the grain spectrum as an injection or casting compound Manufacturing a refractory lining is used.

Insbesondere ist dies für einen SiC enthaltenden Feuerfestausbruch vorgesehen, aber nicht ausschließlich. In particular, this is intended for a refractory eruption containing SiC, but not exclusively.  

Abhängig vom Einsatz ist die Verwendung des gesamten Kornspektrums möglich oder jeweils eines Teiles davon.Depending on the application, the use of the entire grain spectrum is possible or a part of each.

Das gesamte Kornspektrum kann beispielsweise verwendet werden zur Auskleidung einer Roheisen-Chargierpfanne oder in anderen Fällen vergleichweise geringerer thermischer Belastung.The entire grain spectrum can be used, for example, to line a Pig iron charging pan or in other cases comparatively lower thermal Burden.

Als besonders vorteilhafte Weiterbildung der Erfindung wird jedoch vorgeschlagen, den zer­ kleinerten Feuerfestausbruch in eine Fraktion unter 0,5 bis 2 mm Korngröße und in eine Frak­ tion über 0,5 bis 2 mm Korngröße zu teilen und die beiden Fraktionen verschiedenen Zwecken zuzuführen.As a particularly advantageous development of the invention, however, it is proposed that the zer smaller refractory outbreak in a fraction of less than 0.5 to 2 mm grain size and in a frak tion over 0.5 to 2 mm grain size and the two fractions different To be used for purposes.

Die Weiterbildung der Erfindung macht sich den Umstand zunutze, daß bei dieser Verfah­ rensweise eine gewisse Trennung der chemisch-mineralogischen Bestandteile des Materials zustande kommt.The development of the invention takes advantage of the fact that in this process a certain separation of the chemical-mineralogical components of the material comes about.

Das im Hochofenrinnenausbruch, für den die Erfindung in erster Linie vorgesehen ist, enthal­ tene SiC findet sich ganz überwiegend in der feineren Fraktion wieder; die den Schmelz­ punkt herabsetzenden Oxide CaO, Fe2O3, K2O und Na2O sind darin ebenfalls deutlich ange­ reichert.The SiC contained in the furnace gutter outbreak, for which the invention is primarily intended, is found predominantly in the finer fraction; the melting point reducing oxides CaO, Fe 2 O 3 , K 2 O and Na 2 O are also clearly enriched.

Wo die Teilung zwischen der feineren und der größeren Fraktion genau liegen sollte, richtet sich nach der Analyse des Feuerfestausbruches, dem angewandten Zerkleinerungsverfahren und dem vorgesehenen Verwendungszweck und läßt sich durch Routineversuche ermitteln. Als Zerkleinerungsverfahren wird insbesondere eine Zerkleinerung mittels Backenbrecher und anschließend einer Prallmühle und/oder einer Hammermühle vorgeschlagen; die Teilung der Fraktionen dürfte hier meist bei etwa 1 mm Korngröße anzusetzen sein. Aber grund­ sätzlich kommen zwischen 0,7 und 1,5 mm Korngröße liegende Grenzen näher in Betracht.Exactly where the division between the finer and the larger fraction should lie after the analysis of the refractory outbreak, the crushing process used and the intended use and can be determined by routine experimentation. Crushing using a jaw crusher and then proposed an impact mill and / or a hammer mill; the division the fractions should usually be set at around 1 mm grain size. But reason limits between 0.7 and 1.5 mm grain size are also considered.

Die feinere Fraktion soll in Ausgestaltung der weiteren Erfindung mit ihrem erhöhten SiC- Gehalt zur Herstellung eines Roheisen-Entschwefelungsmittels verwendet werden.In the embodiment of the further invention, the finer fraction with its increased SiC Content used to produce a pig iron desulfurization agent.

Für die gröbere Fraktion mit ihrem verringerten Gehalt an den Schmelzpunkt herabsetzen­ den Oxiden werden in Ausgestaltung der weiteren Erfindung verschiedene Verwendungen als Feuerfest-Material vorgeschlagen.For the coarser fraction with its reduced content, lower it to the melting point In the embodiment of the further invention, the oxides have various uses proposed as refractory material.

Grundsätzlich könnte aber auch nur eine der beiden Fraktionen wiederverwertet und die andere auf einer Deponie endgelagert werden. In principle, however, only one of the two groups could be recycled and the others are disposed of in a landfill.  

Als eine spezielle Verwendung der gröberen Fraktion wird die Herstellung einer Gießmasse für die Auskleidung eines Pfannendeckels vorgeschlagen. Der bisher in der Gießmasse vor­ gesehene Tonerdeträger kann so bis zu etwa 30% ersetzt werden.A special use of the coarser fraction is the production of a casting compound proposed for the lining of a pan lid. So far in the casting compound seen alumina carrier can be replaced up to about 30%.

Ein weiterer Verwendungsvorschlag ist die Herstellung einer Gießmasse für die Auskleidung einer Verteilerrinne (Tundish). Hier ist ein Ersatz des bisherigen Tonerdeträgers von bis zu etwa 40% möglich.Another proposed use is the production of a casting compound for the lining a tundish. Here is a replacement of the previous alumina carrier by up to about 40% possible.

Schließlich kommen feuerfeste Mörtel oder Kitte in Betracht. Dafür kann die gröbere Fraktion weiter zerkleinert werden, vorzugsweise mittels Kugelmühle in Fraktionen < 90 µm, 90 bis 250 µm, 250 bis 500 µm und 500 bis 1000 µm. In dem Mörtel oder Kitt kann das erfindungsgemäß eingesetzte Material bis zu etwa 60% der Gesamtmasse ausmachen.Finally, refractory mortar or putty can be used. The coarser faction can do that are further crushed, preferably by means of a ball mill in fractions <90 μm, 90 to 250 µm, 250 to 500 µm and 500 to 1000 µm. This can be done according to the invention in the mortar or putty make up up to 60% of the total mass.

Die gröbere Fraktion kann nach Bedarf weiter unterteilt werden. Insbesondere kommt eine Unterteilung in die Korngrößenbereiche bis zu etwa 3 mm und über etwa 3 mm in Betracht, beispielsweise 1 bis 3 mm und 3 bis 8 mm oder mit weiterer Unterteilung des letzteren Bereichs in 3 bis 5 mm und 5 bis 8 mm.The coarser fraction can be further divided as required. One comes in particular Subdivision into the grain size ranges up to about 3 mm and over about 3 mm into consideration, for example 1 to 3 mm and 3 to 8 mm or with further subdivision of the latter Range in 3 to 5 mm and 5 to 8 mm.

Unter "hochtonerdehaltig" wird im Vorliegenden ein Gehalt von mehr als 60% Al2O3 ver­ standen.In the present case, "high alumina content" means a content of more than 60% Al 2 O 3 .

Beispielexample

Ein Hochofenrinnenausbruch mit Gehalten von 70 bis 85% Al2O3, 4 bis 8% SiO2, bis 2% CaO, bis 3% TiO2, bis 2% Fe2O3, bis 0,5% Na2O, bis 0,5% K2O und 5 bis 15% SiC wurde in einem Backenbrecher und anschließend in einer Prallmühle und einer Hammermühle zerkleinert und mittels eines Magnetschneiders von Eisenteilchen befreit. Das zerkleinerte Material wurde ohne Veränderung der chemischen Zusammensetzung durch Ausscheiden einer Fraktion bei der Herstellung einer Spritzmasse zur Auskleidung des oberen Teils einer Roh­ eisen-Chargierpfanne, des sogenannten Pfannenschnabels, verwendet in solchem Anteil, daß der Al2O3-Gehalt der Spritzmasse von etwas über 80% zu etwa 60% durch den Hoch­ ofenrinnenausbruch eingebracht wurde neben Bauxite und synthetischer Sintertonerde. Die Auskleidung zeigt bei einer Temperaturbelastung von etwa 1150 bis 1400°C und einem gleichermaßen moderaten chemischen Angriff durch Schlacke einen normalen Verschleiß. A blast furnace channel eruption with contents of 70 to 85% Al 2 O 3 , 4 to 8% SiO 2 , to 2% CaO, to 3% TiO 2 , to 2% Fe 2 O 3 , to 0.5% Na 2 O, bis 0.5% K 2 O and 5 to 15% SiC were comminuted in a jaw crusher and then in an impact mill and a hammer mill and iron particles were removed by means of a magnetic cutter. The comminuted material was used without changing the chemical composition by separating a fraction in the production of a spray compound for lining the upper part of a raw iron charging pan, the so-called pan beak, in such a proportion that the Al 2 O 3 content of the spray compound was somewhat In addition to bauxite and synthetic sintered alumina, over 80% to about 60% of the furnace gutter eruption was brought in. The lining shows normal wear at a temperature load of approximately 1150 to 1400 ° C and an equally moderate chemical attack by slag.

Beispiel 2Example 2

Der gleiche zerkleinerte Hochofenrinnenausbruch wie in Beispiel 1 wurde durch Sieben in eine Fraktion unter 1 mm Korngröße und eine Fraktion über 1 mm Korngröße, die letztere mit weiterer Unterteilung in die Korngrößenbereiche 1 bis 3 mm, 3 bis 5 mm und 5 bis 8 mm, auf­ geteilt.The same comminuted blast furnace channel outbreak as in Example 1 was achieved by sieving in a fraction below 1 mm grain size and a fraction above 1 mm grain size, the latter with further subdivision into the grain size ranges 1 to 3 mm, 3 to 5 mm and 5 to 8 mm divided.

Die Fraktion unter 1 mm hatte eine Zusammensetzung von 43 bis 53% Al2O3, 5 bis 6% SiO2, bis 2% CaO, bis 1% TiO2, bis 2,5% Fe2O3, bis 0,5% Na2O, bis 0,5% K2O und 11 bis 27% SiC.The fraction below 1 mm had a composition of 43 to 53% Al 2 O 3 , 5 to 6% SiO 2 , to 2% CaO, to 1% TiO 2 , to 2.5% Fe 2 O 3 , to 0.5 % Na 2 O, up to 0.5% K 2 O and 11 to 27% SiC.

Die Zusammensetzung der Fraktion über 1 mm betrug 66 bis 83% Al2O3, 6 bis 9% SiO2, bis 1% CaO, bis 3% TiO2, bis 0,5% Fe2O3, bis 0,4% Na2O, bis 0,2% K2O und 5 bis 12% SiC.The composition of the fraction over 1 mm was 66 to 83% Al 2 O 3 , 6 to 9% SiO 2 , to 1% CaO, to 3% TiO 2 , to 0.5% Fe 2 O 3 , to 0.4% Na 2 O, up to 0.2% K 2 O and 5 to 12% SiC.

Die Fraktion unter 1 mm wurde zu einem Entschwefelungsmittel verarbeitet; in einem her­ kömmlichen Entschwefelungsmittel aus 90% CaC2 und 10% Mg wurde 1/5 des teuren CaC2 durch die Fraktion unter 1 mm ersetzt, deren SiC-Gehalt gleichfalls entschwefelnde Wirkung hat und damit die Verminderung des CaC2-Gehaltes ausgleicht.The fraction below 1 mm was processed to a desulfurizing agent; In a conventional desulfurization agent made of 90% CaC 2 and 10% Mg, 1/5 of the expensive CaC 2 was replaced by the fraction below 1 mm, the SiC content of which also has a desulfurizing effect and thus compensates for the reduction in the CaC 2 content.

Die Fraktion über 1 mm wurde zur Herstellung einer feuerfesten Gießmasse verwendet; in einer herkömmlichen Masse zur Auskleidung eines Gießpfannendeckels mit der Zusammen­ setzung etwa 86% Al2O3, etwa 7% SiO2, etwa 3% CaO, etwa 2,5% TiO2, etwa 0,8% Fe2O3, etwa 0,2% Na2O, etwa 0,3% K2O und etwa 1,3% SiC usw. wurde 1/4 des Al2O3 durch Hinzufügen der Fraktionen über 1 mm eingebracht. Deren Unterteilung in die verschiedenen Kornfraktionen dient in üblicher Weise der Einstellung eines gewünschten Körnungsaufbaues.The fraction over 1 mm was used to make a refractory casting compound; in a conventional mass for lining a ladle cover with the composition about 86% Al 2 O 3 , about 7% SiO 2 , about 3% CaO, about 2.5% TiO 2 , about 0.8% Fe 2 O 3 , about 0.2% Na 2 O, about 0.3% K 2 O and about 1.3% of SiC, etc. is 1/4 of the Al 2 O 3 mm is introduced by adding the fractions on the first Their subdivision into the different grain fractions serves in the usual way to set a desired grain structure.

Claims (18)

1. Verfahren zur Wiederverwertung eines Feuerfestausbruches, dadurch gekennzeichnet, daß ein hochtonerdehaltiger Feuerfestausbruch zerkleinert wird und mindestens ein Teil des Kornspektrums als Spritzmasse oder Gießmasse zur Herstellung einer Feuerfest-Aus­ kleidung verwendet wird.1. A method for recycling a refractory outbreak, characterized in that a high-alumina refractory outbreak is crushed and at least part of the grain spectrum is used as a spray or casting compound for the production of a refractory clothing. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein außerdem SiC enthaltender Feuerfestausbruch in der genannten Weise ver­ wendet wird.2. The method according to claim 1, characterized, that a refractory outbreak also containing SiC ver in the manner mentioned is applied. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Feuerfestausbruch zur Auskleidung einer Chargierpfanne verwendet wird.3. The method according to claim 1 or 2, characterized, that the refractory outbreak is used to line a charging pan. 4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der zerkleinerte Feuerfestausbruch in eine Fraktion unter 0,5 bis 2 mm Korngröße und in eine Fraktion über 0,5 bis 2 mm Korngröße geteilt wird und die beiden Fraktionen verschiedenen Verwendungszwecken zugeführt werden.4. The method according to claim 1 or 2, characterized, that the crushed refractory outbreak into a fraction below 0.5 to 2 mm grain size and divided into a fraction over 0.5 to 2 mm grain size and the two fractions can be used for various purposes. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der zerkleinerte Feuerfestausbruch in eine Fraktion unter 0,7 bis 1,5 mm, vorzugs­ weise unter etwa 1 mm, Korngröße und eine Fraktion über der betreffenden Korngröße geteilt wird.5. The method according to claim 4, characterized, that the crushed refractory outbreak in a fraction below 0.7 to 1.5 mm, preferably less than about 1 mm, grain size and a fraction above the grain size in question is shared. 6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Feuerfestausbruch mittels eines Backenbrechers und einer Prallmühle und/oder einer Hammermühle zerkleinert wird. 6. The method according to claim 4 or 5, characterized, that the refractory eruption by means of a jaw crusher and an impact mill and / or is crushed in a hammer mill.   7. Verfahren nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Fraktion unter der betreffenden Korngröße zur Herstellung eines Roheisenent­ schwefelungsmittels verwendet wird.7. The method according to any one of claims 4 to 6, characterized, that the fraction under the grain size concerned to produce a pig iron sulfurizing agent is used. 8. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß die Fraktion über der betreffenden Korngröße zur Herstellung der genannten Spritz- oder Gießmasse verwendet wird.8. The method according to any one of claims 4 to 7, characterized, that the fraction above the grain size in question for the production of the spray or casting compound is used. 9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die Fraktion zur Herstellung einer Gießmasse für die Auskleidung eines Pfannen­ deckels verwendet wird.9. The method according to claim 8, characterized, that the fraction for the production of a casting compound for the lining of a pan lid is used. 10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß die Fraktion in einer Menge von bis zu etwa 30% des in der Gießmasse vorgesehe­ nen Tonerdeträgers verwendet wird.10. The method according to claim 9, characterized, that the fraction is provided in an amount of up to about 30% of that in the casting compound NEN alumina is used. 11. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die Fraktion zur Herstellung einer Gießmasse für die Auskleidung einer Verteilerrinne verwendet wird.11. The method according to claim 8, characterized, that the fraction for the production of a casting compound for the lining of a distribution channel is used. 12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß die Fraktion in einer Menge von bis zu 40% des in der Gießmasse vorgesehenen Tonerdeträgers verwendet wird.12. The method according to claim 11, characterized, that the fraction in an amount of up to 40% of that provided in the casting compound Alumina carrier is used. 13. Verfahren nach einem der Ansprüche 4 bis 12, dadurch gekennzeichnet, daß die Fraktion über der betreffenden Korngröße weiter zerkleinert wird. 13. The method according to any one of claims 4 to 12, characterized, that the fraction above the grain size in question is further crushed.   14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, daß die Fraktion zur Herstellung eines feuerfesten Mörtels oder Kittes weiter zerkleinert wird in Fraktionen < 90 µm, 90 bis 250 µm, 250 bis 500 µm und 500 bis 1000 µm, vorzugs­ weise mittels einer Kugelmühle.14. The method according to claim 13, characterized, that the fraction is further crushed to produce a refractory mortar or putty is preferred in fractions <90 µm, 90 to 250 µm, 250 to 500 µm and 500 to 1000 µm wise by means of a ball mill. 15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, daß die in Anspruch 11 erstgenannte Fraktion in einer Menge von bis etwa 60% des feuerfesten Mörtels oder Kittes verwendet wird.15. The method according to claim 14, characterized, that the first-mentioned fraction in an amount of up to about 60% of refractory mortar or putty is used. 16. Verfahren nach einem der Ansprüche 4 bis 15, dadurch gekennzeichnet, daß die Fraktion über der betreffenden Korngröße weiter unterteilt wird.16. The method according to any one of claims 4 to 15, characterized, that the fraction is further divided over the grain size in question. 17. Verfahren nach Anspruch 16, dadurch gekennzeichnet, daß die Fraktion in Korngrößenbereiche unter etwa 3 mm und über etwa 3 mm unter­ teilt wird.17. The method according to claim 16, characterized, that the fraction in grain size ranges below about 3 mm and over about 3 mm below is shared. 18. Verfahren nach Anspruch 17, dadurch gekennzeichnet, daß die Fraktion in Korngrößenbereiche 1 bis 3 mm, 3 bis 5 mm und 5 bis 8 mm unterteilt wird.18. The method according to claim 17, characterized, that the fraction is divided into grain size ranges 1 to 3 mm, 3 to 5 mm and 5 to 8 mm becomes.
DE19722035A 1997-05-27 1997-05-27 Reuse of especially silicon carbide-containing alumina-rich refractory rubble Withdrawn DE19722035A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19722035A DE19722035A1 (en) 1997-05-27 1997-05-27 Reuse of especially silicon carbide-containing alumina-rich refractory rubble

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722035A DE19722035A1 (en) 1997-05-27 1997-05-27 Reuse of especially silicon carbide-containing alumina-rich refractory rubble

Publications (1)

Publication Number Publication Date
DE19722035A1 true DE19722035A1 (en) 1998-12-03

Family

ID=7830562

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19722035A Withdrawn DE19722035A1 (en) 1997-05-27 1997-05-27 Reuse of especially silicon carbide-containing alumina-rich refractory rubble

Country Status (1)

Country Link
DE (1) DE19722035A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7148170B2 (en) * 2001-07-23 2006-12-12 Taiyo Yuden Co., Ltd. Recycled ceramic slurry, recycled ceramic powder, ceramic electronic part, and fabricating methods therefor
US20170217837A1 (en) * 2014-08-01 2017-08-03 P-D Refractories GmbH Formed fired refractory material having a high level of spectral emission, method for production thereof and method for increasing the level of spectral emission of refractory shaped bodies
CN108358651A (en) * 2018-05-11 2018-08-03 马鞍山利尔开元新材料有限公司 A kind of aluminium carbon fire clay and preparation method thereof of addition slide plate regeneration fine powder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7148170B2 (en) * 2001-07-23 2006-12-12 Taiyo Yuden Co., Ltd. Recycled ceramic slurry, recycled ceramic powder, ceramic electronic part, and fabricating methods therefor
US20170217837A1 (en) * 2014-08-01 2017-08-03 P-D Refractories GmbH Formed fired refractory material having a high level of spectral emission, method for production thereof and method for increasing the level of spectral emission of refractory shaped bodies
CN107108378A (en) * 2014-08-01 2017-08-29 P-D耐火材料有限公司 The method of forming and sintering refractory material and its production method and raising fire resisting formed body spectral emissivity with EO-1 hyperion emissivity
CN108358651A (en) * 2018-05-11 2018-08-03 马鞍山利尔开元新材料有限公司 A kind of aluminium carbon fire clay and preparation method thereof of addition slide plate regeneration fine powder
CN108358651B (en) * 2018-05-11 2020-12-01 马鞍山利尔开元新材料有限公司 Aluminum-carbon refractory mortar added with recycled fine powder of skateboard and preparation method thereof

Similar Documents

Publication Publication Date Title
EP0790215B1 (en) Spherical metal oxide powder particles and process for the preparation thereof
DE69216774T2 (en) Porous and granulated steel slag and the use of such a slag as a substitute for aggregates or cement in building materials and road building materials
DE69617820T2 (en) Rock wool with high resistance and process for its production
EP1074529B2 (en) Refractory article, refractory composition and method for manufacturing a refractory article for metallurgical processes
EP0611740B1 (en) Titanium-containing aggregate and use thereof for increasing the durability of refractory funace walls
EP0794929B1 (en) Corundum porcelain composition, method for preparing it and use of the corundum porcelain composition
DE19722035A1 (en) Reuse of especially silicon carbide-containing alumina-rich refractory rubble
DE2611889A1 (en) High grade cement made from steelworks slags - by melting with lime in oxygen converter, using lance to heat slag mixt.
EP2049451A1 (en) Titanium-containing additive
EP1234807B1 (en) Refractory body with increased alkali resistance
EP0922749A1 (en) Process for treating RESH or a light fraction thereof
EP2853320A1 (en) Casting mould or a casting mould core made from coated mould sand for metal casting
DE2344324C3 (en) Process for the treatment of sulphurous slag and its use
EP3511307B1 (en) Raw melt material for the manufacture of a refractory product, a method for producing the raw melt material, and use of the raw melt material
EP0768386B1 (en) Method for lowering the melting point of the residual ash of coal
DE3301172C1 (en) Process for the production of a silicon and iron-free abrasive for surface treatment
KR100333066B1 (en) Production process of upper nozzle packing materials for ladle
DE1646837C2 (en) Process for the production of refractory, in particular unfired, magnesite chrome and chrome magnesite bricks
AT408653B (en) METHOD FOR PRODUCING MERCHANT SLAG
EP1295656B1 (en) Tap hole mass with fine Tio2, method for the production and use
EP4077239B1 (en) Backfill for producing a basic heavy-clay refractory product, such a product and method for producing same, lining of an industrial furnace, and industrial furnace
EP0859063A1 (en) Process for mnaufacturing and use of an additive containing titaniumdioxide
DE3642025C1 (en) Process for the production of pig iron in the blast furnace
CN112624689A (en) Blast furnace ore tank wear-resistant material and manufacturing method thereof
WO2019068483A1 (en) Method for recycling ceramics, regenerated materials obtained thereby, and use of the regenerated materials for manufacturing ceramics

Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee