Refratechnik Holding Gmbh

Abb K.k.

Abb Flaekt Ab

Refractechnik Holding Gmbh

Euwe Eugen Wexler Holding Gmbh & Co. Kg

Euwe Eugen Wexler Gmbh

Refratechnik Steel Gmbh

Helge Jansen

Thomas Schemmel

Petra Stein

Michael Schölwer

Volker Stein

Peter Bartha

Christos Georgios Aneziris

Heinrich Grosse Daldrup

Holger Wirsing

Ludwig Weiler

Lothar Schuh

Christian Wieckert

Hans-Jürgen Klischat

Rolf-Dieter Kizio

Constantin Jahn

Bertram Kesselheim

Iris Born

Bernd Scheubel

Hans Wienand

Steffen Dudczig

Ferdinand Singer

Frederick Ott

Thomas SÖRGEL

A synthesis method for producing a refractory oxide-ceramic material of CaZrO, in particular in the form of a refractory granular material that is preferably mechanically comminuted, in particular crushed and/or ground, as well as to a batch and a coarse ceramic, shaped or unshaped, refractory product containing at least one pre-synthesized refractory calcium zirconate-containing granular material.

Synthesis method for producing a calcium zirconate-containing material and batch and coarse ceramic refractory product having a pre-synthesized calcium zirconate-containing granular material

A heat insulating plate (), preferably a covering plate (), especially for thermal isolation of molten metal, especially of molten steel, in a metallurgical vessel (), wherein the plate () includes a binding agent matrix () of at least one, set, temporary, organic binding material and aggregate grains () with and/or of biogenic silicic acid, preferably with and/or of rice husk ash, which grains () are incorporated into the binding agent matrix (), and to a method for production of the plate () and its use.

Plate, in particular covering plate for molten metal, and method for producing the plate and use thereof

An unfired, refractory molded body (), especially a plate, especially for thermal insulation of molten metal and/or an ingot solidifying from molten metal, that includes a binding agent matrix () of a set binder and aggregate grains () of biogenic silicic acid, preferably of rice husk ash, which are incorporated into the binding agent matrix (), wherein the binding agent matrix () consists of silica gel, as well as a process for its production and its usage.

Insulating, refractory molded body, especially plate, and process for its manufacture and its usage

An unfired, refractory molded body (), includes a binding agent matrix () containing at least one set, permanent binding material and aggregate grains () with and/or of biogenic silicic acid, preferably with and/or of rice husk ash, which grains are incorporated into the binding agent matrix (), for thermal isolation of a molten metal, especially of molten steel, and/or of a metal ingot solidifying from the molten metal, and also the use of the molded body () for thermal isolation of a refractory lining, in particular in a multiple-layer brick wall or in a heat-treatment furnace, or as a corrosion barrier, e.g. against alkali attack, or as a fire protection lining or as filter material for hot gases.

Use of a heat insulating molded body for isolation of molten metal against the atmosphere or against a metallurgical vessel

A refractory has the form of a dry, mineral batch of fire-resistant mineral materials combined in such a way that refractories which are long-term resistant to fayalite-containing slags, sulfidic melts (mattes), sulfates and non-ferrous metal melts and are used for refractory linings in industrial non-ferrous metal melting furnaces can be manufactured. The refractory at least contains: &#x2014;at least one coarse-grained magnesia raw material as the main component; &#x2014;magnesia (MgO) meal; &#x2014;at least one fire-resistant reagent which, during the melting process, acts (in situ) in a reducing manner on non-ferrous metal oxide melts and/or non-ferrous metal iron oxide melts and converts same into non-ferrous metal melts.

Refractories and use thereof

A refractory has the form of a dry, mineral batch of fire-resistant mineral materials combined in such a way that refractories which are long-term resistant to fayalite-containing slags, sulfidic melts (mattes), sulfates and non-ferrous metal melts and are used for refractory linings in industrial non-ferrous metal melting furnaces can be manufactured. The refractory at least contains: &#x2014;at least one coarse-grained olivine raw material as the main component; &#x2014;magnesia (MgO) meal; &#x2014;at least one fire-resistant reagent which, during the melting process, acts (in situ) in a reducing manner on non-ferrous metal oxide melts and/or non-ferrous metal iron oxide melts and converts same into non-ferrous metal melts.

A batch made of refractory mineral materials for lining of assemblies used for nonferrous metal melts, contains over 90% by weight of a mixture of the following constituents:&#x2014;from 3 to 74% by weight of at least one coarse-grain raw olivine material with at least 70% by weight forsterite content and having grain sizes of 50% by weight over 0.1 mm&#x2014;from 25 to 49% by weight of at least one ground magnesia with grain sizes of 50% by weight&#x2264;1 mm&#x2014;from 0.9 to 14% by weight of at least one ground silicon carbide (SiC) with grain sizes of 50% by weight&#x2264;1 mm&#x2014;from 0.1 to 10% by weight of at least one fine-particle dry pulverulent silica with particle sizes&#x2264;500 &#x3bc;m&#x2014;from 0 to 4% by weight of at least one antioxidant known per se for refractory products&#x2014;from 0 to 4% by weight of at least one additional granulated refractory raw material known per se, more particularly having grain sizes of 50% by weight, in particular of 80% by weight, preferably of 100% by weight over 0.1 mm&#x2014;from 0 to 2% by weight of at least one additive known per se for the production of refractory products from batches&#x2014;from 0 to 4% by weight of at least one additional substance known per se made of ground refractory materials and/or in the form of what is known as medium-grain-size material and/or of what is known as coarse-grain-size material&#x2014;from 0 to 10% by weight of at least one binder known per se for refractory materials, e.g. in dry form or in ancillary packaging in liquid form.

Refractory batch and use thereof

A molded, fireproof product, which contains graphite, in particular natural graphite, and is based on fireproof granular materials. The granular-material grains of the product are consolidated to form a molded body by means of a binder known per se and/or ceramic bonding. The product has a homogeneous mixture of at least two graphite types, which each have a different coefficient of thermal expansion. One graphite type is predominant by amount and the other graphite type acts as an auxiliary graphite type. The invention further relates to a method for producing a product and to the use of the product.

Fireproof product containing graphite, method for producing said product, and use of said product

A flame-retardant batch, and the use thereof, primarily contains&#x2014;at least 30% by weight of a coarse-grain olivine raw material with a forsterite content of, e.g. at least 70% by weight and having grain sizes of, e.g. 100% by weight over 0.1 mm, &#x2014;at least 35% by weight in magnesia in meal form with grain sizes of, e.g. 100% by weight.

Flame-retardant product and use thereof

There is a process for creating graphite free non-fired refractory products, which are molded using presses and which includes using a plurality of different binders. The binders comprise a first binder for binding grains of granulation between room temperature and 400&#xb0; C., a second binder binding the grains of granulation between 300 and 900&#xb0; C.; and a third binder binding granulations of the refractory materials that enter into ceramic binding at temperatures above 900&#xb0; C. This process is for producing at least one of magnesia chromite bricks, magnesia spinel and spinel bricks, magnesia zirconia and magnesia zircon bricks, magnesia hercynite and magnesia galaxite bricks, dolomite, dolomite-magnesia, and lime bricks, forsterite and olivine bricks, magnesia forsterite bricks, magnesia pleonast bricks, magnesia bricks. These products are configured to operate as a fire-side, refractory lining of large-volume industrial furnaces operated with an essentially oxidizing atmosphere, for the production of cement, lime, magnesia, and doloma.

Process using non-fired refractory products as a lining of large-volume industrial furnaces and industrial furnaces lined with the non-fired refractory products

The invention relates to a refractory, ceramically fired, carbon-bonded magnesia brick whose matrix is more than 70% by weight, in particular from 80 to 98% by weight, of MgO grains and also a carbon framework binder matrix resulting from carbonization, and pores, wherein the MgO grains are fixed by means of carbon bonding of the carbon framework and at least 30%, in particular from 50 to 100%, of the MgO grains have at least one sintering bridge resulting from the ceramic firing.

Refractory carbon-bonded magnesia brick and process for producing it

The invention relates to a granulated raw material for refractory graphite-containing products in the form of shaped granules, with the granules each comprising a coarse resistor particle which is enveloped by a shell comprising graphite flocs and cured binder, in particular a carbon-containing binder. In addition, the invention relates to a process for producing the granulated resistor material and to the use of the granulated raw material.

Granulated raw material for refractory products and also a process for the production of and use of the granulated raw material

A batch, in particular for the production of a refractory shaped body, includes at least one refractory metal oxide component and a synthetic resin component as a binder, and a graphitizing auxiliary for producing crystalline graphite carbon from the resin. The graphitizing auxiliary originates from a group consisting of reducible organic compounds of transition elements and/or a group of active organic or inorganic metal compounds or metals, such as resin-soluble metal salts, chemically precipitated or micronized metal oxides or metals. The graphitizing auxiliary is available in molecular form over the time and/or temperature range of conversion of the synthetic resin into carbon (carbonization).

Carbonaceous refractory shaped body with improved oxidation behavior and batch composition and method for producing the same

A refractory repair batch material includes a refractory, in particular a basic resistor component in granule form and a binder system. The binder system contains at least one hard bitumen component in granule form, at least one ignitable metal powder and at least one combustible mineral oil.

Refractory repair material batch

The invention relates to a refractory batch containing at least one refractory metal oxide component, at least one binder component, such as resin or pitch, if appropriate antioxidants, at least one carbon carrier, such as soot and/or graphite, and reinforcement fibers which are formed from a stainless steel material, which at the temperatures of use forms a coat of the refractory metal oxide on its surface, and to a shaped body made from the batch and to a process for producing the shaped body.

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Friedland, Germany

Helge Jansen