Refratechnik Holding Gmbh

Heidelberger Druckmaschinen Ag

Refratechnik Steel Gmbh

Thomas Schemmel

Helge Jansen

Werner Schwab

Petra Stein

Michael Schölwer

Volker Stein

Hans-Jürgen Klischat

Bertram Kesselheim

Rainer Gaebel

Marco Melischko

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.

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Meerbusch, Germany

Thomas Schemmel