Didier-Werke Ag

Kulmbacher Klimagerate-Werk Gmbh & Co. Kg

Axel Eschner

Hermann Stein

Rudolf Ganz

Gunter Tkotz

Klaus Kreuels

Raimund Bruckner

Hans Rothfuss

Peter Jeschke

Erich Pohlmann

Wilhelm Langenfeld

Manfred Oberbach

Thomas Weichert

Hermann Leupold

Klaus Wieland

Dieter Stusser

Christoph Wohrmeyer

The invention relates to a process of making fiber structures in the form of refractory light-weight moldings. These fiber structures exhibit the advantage that they do not contain, or contain virtually no harmful fibers, and/or that such fibers that might still exist in the fiber structures can be readily decomposed by water or body fluids. Nevertheless, the fiber structures exhibit the advantageous thermal and mechanical properties of conventional light-weight moldings. The fiber structures according to the invention are manufactured using inorganic fibers, wherein at least 90% by weight of each fiber comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides. Water or a water-containing liquid is used as the charge liquid, and conventional refractory additives may also be added to the mixture of fibers and water to be molded.

Process of making refractory fiber structures

The invention relates to fiber structures in the form of refractory light-weight moldings. These fiber structures exhibit the advantage that they do not contain, or contain virtually no harmful fibers, and/or that such fibers that might still exist in the fiber structures can be readily decomposed by water or body fluids. Nevertheless, the fiber structures exhibit the advantageous thermal and mechanical properties of conventional light-weight moldings. The fiber structures according to the invention are manufactured using inorganic fibers, wherein at least 90% by weight of each fiber comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides. Water or a water-containing liquid is used as the charge liquid, and conventional refractory additives may also be added to the mixture of fibers and water to be molded.

Refractory fiber structures

Refractory or fireproof brick useful as tin bath bottom brick, wherein the brick is made of a calcium aluminate having both coarse and fine grain sizes, and a binder made of calcium aluminate.

Refractory or fireproof brick as tin bath bottom brick

The invention relates to inorganic fibers, and a process for their production. The inorganic fibers lose their fiber form factor after a short contact period with water or a physiological body fluid, so that danger to health is not expected from such fibers remaining for a prolonged period of time in or on human tissue. The fiber of the invention is characterized by the fact that at least 90% of it comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides.

Inorganic fiber

A tap spout, particularly for allowing molten metal to be discharged from oxygen-steel converters, includes a replaceable unit including a tubular wear lining and a jointing layer secured thereto. An inner lining of the tap spout may thus be repaired with relatively simple maintenance work by removing the inner lining and subsequently inserting the replaceable unit into an outer lining of the tap spout to form a new inner lining of the tap spout. The replaceable unit is adapted to facilitate either a press fit, and in particular, a fit ensured by axial compression of the jointing layer, or an expansion fit with the outer lining to secure the replaceable unit therein.

Tap spout for metallurgical vessels and method of repairing

The temperature of humid environmental air is reduced by passing the air, in a first stage, through a moisture storage agent and therein substantially freeing the air of the moisture content thereof. In a second stage, the air is passed through a heat storage agent and therein the temperature of the air is lowered without changing the humidity thereof. In a third stage the thus dried and cooled air is passed through a moisturizing system, and therein the moisture content of the air is increased and the temperature of the air is further lowered.

Method and apparatus for reducing the temperature of air

Plastic composition which can be processed into a fire-resistant material, use thereof, and process for its production, which process comprises mixing ceramic fibers with a substantially dry organic bonding agent to produce a first mixture, mixing the first mixture with water to produce a second mixture, mixing the second mixture with clay to produce a third mixture, and mixing the third mixture with an aqueous solution of an organic bonding agent to produce a fourth mixture, with the proviso that the ceramic fibers account for at least 74% by weight of the solids content in the plastic composition.

Process for producing a plastic composition which can be processed into

Granular, fire-resistant material, use thereof and process for its production, which process comprises mixing ceramic fibers, a refractory material such as clay, a phosphate bonding agent and water, to form a substantially uniformly dispersed mixture, compacting the mixture by a volume coefficient of at least 3, subjecting the compacted mixture to heat-treatment, and granulating the thus heated product.

Process for producing granular, fire-resistant material

An electrically heated valve element for sliding type valve joints in the outlet of a molten metal vessel has an electrical heating conductor disposed predominately in the outlet closing surface section of the valve element so that when moved to the casting position where the molten metal flow passage aligns with the flow passage from the vessel, the outlet closing surface of the element is maintained at a uniformly high temperature so that any cooling down of the outlet closing surface is avoided. The valve element is made by embedding the heating conductor which is air annealed nichrome wire in spiral form, into the refractory material of the valve element by vibration, the embedding mass being free of organic substances, carbon, sulfur, metallic iron, alkalies and/or electrically conductive substances.

Valve element for sliding type valve joints on the outlet of vessels

There is disclosed a process for the production of a ceramic heat-retaining brick based on olivine which comprises shaping and drying a mixture of granular material and a binding agent. The granular material includes powdered iron having a particle size of less than 0.1 mm in an amount of between 5 and 20% by weight of the brick. The brick is subsequently burnt in an oxidizing atmosphere and the powdered iron is substantially converted to iron oxide.

Process for the production of a ceramic heat-retaining brick

A regenerative heater includes a regenerator container having open opposite ends. The container contains therein a fill of heat retaining material which is permeable to the passage therethrough of gas, throughout the entire length thereof in opposite directions between the open opposite ends of the container. The fill of heat retaining material comprises solid fine granular particles having a low thermal conductivity. A heat source is positioned adjacent the first end of the fill of heat retaining material. At least one blower is provided for circulating gas in opposite directions through the entire length of the fill of heat retaining material and across substantially the entire cross-section thereof. A charging flow of gas is first circulated in a first direction through the fill of heat retaining material, such that the charging flow of gas is heated by the heat source and then passes through the heat retaining material while transferring heat to the heat retaining material. Then, a discharging flow of gas is passed in a second opposite direction through the fill of heat retaining material, such that the discharging flow of gas receives heat from the fill of heat retaining material. At least the charging flow of gas is entirely enclosed in a completely closed circulation path including the interior of the regenerator container.

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Wiesbaden, Germany

Axel Eschner