A furnace containment structure includes a roof assembly including at least one layer of refractory material that includes a first layer of refractory material, a plurality of sidewalls, a plurality of pockets disposed in the first layer of ceramic refractory material, each pocket including a retainer that is spaced apart from sides of the pocket by gaps when the roof assembly is at room temperature, an upper plate disposed above the first layer of refractory material, and a first plurality of suspension rods that pass through first holes in the at least one layer of refractory material and the upper plate, wherein the plurality of suspension rods mechanically couple the retainers to the upper plate to retain the at least one layer of refractory material. The structure can use materials with different thermal expansion rates without cracking at elevated temperatures.

A method for protecting an inner wall (12) of a shaft furnace, the method comprising the steps of: providing at least one injection device (28) through the inner wall (12) of the shaft furnace, the injection device (28) being configured to inject protective material into the shaft furnace; and injecting on demand the protective material into the shaft furnace through the injection device (28), in such a manner that the protective material builds up to form a protection wall between the interior of the shaft furnace and the furnace wall (12).

The invention relates to a metallurgic furnace, in particular a metallurgic furnace for receiving a molten metal.

Electric arc, and ladle, furnaces 10 have components 14 with a high-emissivity/high reflectivity layer 18 disposed on the hot face 16. The component 14 includes a water-cooled panel 40, a duct 34, roof 12 frame 38, pipes, dry delta 36, water-cooled delta 28, fourth hole elbow 32, fourth hole roof 42, side walls 26 and combinations thereof. The high-emissivity/high-reflectivity layer 18 comprises, in dry admixture, from about 5% to about 40% of an inorganic adhesive, from about 45% to about 92% of a filler, and from about 1% to about 25% of one or more emissivity agents.

A silica-based dry refractory composition (“DRC”) comprising, by weight, about 95% to about 99.9% silica, and about 0.1 to about 5% binder, wherein the silica comprises about 40% to about 80% quartz and about 20% to about 60% fused silica, and the DRC has less than about 5% crystalline silica having a size less than 10 μm. A method of forming a refractory lining is also provided.

A dental furnace for firing dental-ceramic compounds comprises a firing chamber for receiving ceramic elements to be fired. Further, a heating device for heating and firing the ceramic element is provided. The heating device comprises at least one heating element for producing IR radiation in the range of 0.8-5 μm.

A graphite-containing refractory has higher bending strength and fracture energy than known refractories. The graphite-containing refractory has a graphite content of 1% to 80% by mass. 1000 to 300000 carbon fibers with a fiber diameter of 1 to 45 μm/fiber are bundled. The carbon fiber bundle has a length of 100 mm or more and is placed within the graphite-containing refractory to form the same.

An injector configured for arrangement within a reactor of a vertical furnace to inject gas in the reactor is provided. The injector is made substantial elongated and configured with an internal gas conduction channel to transport gas from a first end of the injector to a second end of the injector. An outer sidewall of the injector may be tapered towards the second end over at least 10%, preferably 30% and most preferably 50% of the length of the injector to increase tolerances for fitting the injector in the tube.

High heat flux furnace cooler comprise CuNi pipe coils cast inside pours of high purity (99%-Wt) copper. The depth of front copper cover over the pipe coils in the hot face to manufacture into the casting is derived from a projection of the thermal and stress conditions existing at the cooler's end-of-campaign-life. CFD and/or FEA analyses and modeling is used for a trial-and-error zeroing in of the optimum geometries to employ in the original casting of CuNi pipe coils in high purity copper casting. Individual pipe coil positions to cast inside a copper casting mold are secured with devices that will not melt, cause thermal shear stresses, or be the source of contaminations or copper defects. Pipe bonding to the casting results because the differential coefficient of expansions of the pipes' and the casting's copper alloys involved do not exceed the yield strength of the casting copper during operational thermal cycling.

An unfired, refractory molded body (1), includes a binding agent matrix (2) containing at least one set, permanent binding material and aggregate grains (3) with and/or of biogenic silicic acid, preferably with and/or of rice husk ash, which grains are incorporated into the binding agent matrix (2), 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 (1) 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.