Refratechnik Holding Gmbh

Volker Stein

Helge Jansen

Thomas Schemmel

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.

Growing community of inventors

Goettingen, Germany

Volker Stein