Abstract: A process for making a filter suitable for filtering molten metal comprising (i) forming a slurry comprising (a) particles of a refractory material, (b) a binder and (c) a liquid carrier, (ii) coating a disposable former with a slurry, (iii) drying the coated former, (iv) optionally applying one or more additional coats of a refractory material and/or a binder, optionally with liquid carrier, and drying the one or more additional coats, and (v) firing the coated former to produce the filter, wherein the binder is a carbon rich source selected from one or more of the following classes of materials: pitches, tars and organic polymers that degrade to form carbon on pyrolysis.

Abstract: A process for making a filter suitable for filtering molten metal comprising (i) forming a slurry comprising (a) particles of a refractory material, (b) a binder and (c) a liquid carrier, (ii) coating a disposable former with a slurry, (iii) drying the coated former, (iv) optionally applying one or more additional coats of a refractory material and/or a binder, optionally with liquid carrier, and drying the one or more additional coats, and (v) firing the coated former to produce the filter, wherein the binder is a carbon rich source selected from one or more of the following classes of materials: pitches, tars and organic polymers that degrade to form carbon on pyrolysis.

Abstract: A filter for molten metal is an open-pored porous material comprising particles of refractory material embedded in and bonded together by a carbon matrix bonding material. The filter can be made by forming a porous article from refractory particles, e.g. refractory oxide, carbide or graphite, and a carbon-rich binder, e.g. tar, pitch or an organic (preferably aromatic) polymer that degrades to form carbon on pyrolysis, and then firing the porous article to generate the carbon matrix in which the refractory particles are embedded. The porous article is preferably made by coating a reticulated polyurethane foam with binder and refractory particles, and firing at preferably no higher than 800° C.

Abstract: A filter for molten metal is an open-pored porous material comprising particles of refractory material embedded in and bonded together by a carbon matrix bonding material. The filter can be made by forming a porous article from refractory particles, e.g. refractory oxide, carbide or graphite, and a carbon-rich binder, e.g. tar, pitch or an organic (preferably aromatic) polymer that degrades to form carbon on pyrolysis, and then firing the porous article to generate the carbon matrix in which the refractory particles are embedded. The porous article is preferably made by coating a reticulated polyurethane foam with binder and refractory particles, and firing at preferably no higher than 800° C.

Abstract: A filter for molten metal is an open-pored porous material comprising particles of refractory material embedded in and bonded together by a carbon matrix bonding material. The filter can be made by forming a porous article from refractory particles, e.g. refractory oxide, carbide or graphite, and a carbon-rich binder, e.g. tar, pitch or an organic (preferably aromatic) polymer that degrades to form carbon on pyrolysis, and then firing the porous article to generate the carbon matrix in which the refractory particles are embedded. The porous article is preferably made by coating a reticulated polyurethane foam with binder and refractory particles, and firing at preferably no higher than 800° C.

Abstract: A filter for molten metal is an open-pored porous material comprising particles of refractory material embedded in and bonded together by a carbon matrix bonding material. The filter can be made by forming a porous article from refractory particles, e.g. refractory oxide, carbide or graphite, and a carbon-rich binder, e.g. tar, pitch or an organic (preferably aromatic) polymer that degrades to form carbon on pyrolysis, and then firing the porous article to generate the carbon matrix in which the refractory particles are embedded. The porous article is preferably made by coating a reticulated polyurethane foam with binder and refractory particles, and firing at preferably no higher than 800° C.

Abstract: The disclosed invention relates to the field of ceramics and concerns an open-cell expanded ceramic which may be used in the form of a deep-bed filter, and a process for the production thereof. The primary object is to produce an open-cell expanded ceramic by a simple and economical process. This object is attained by an open-cell expanded ceramic in which the inner cavities, cracks and the porosity of the ceramic members are filled partially or completely by one or a plurality of metal and/or ceramic phases and/or glass phases. The open-cell expanded ceramic is also produced in that during or after sintering the cavities, cracks and the porosity of the ceramic members are partially or completely filled with a melt or a suspension which melt below the melting temperature of the expanded ceramic, have a coefficient of expansion similar to the coefficient of expansion of the expanded ceramic, and a very good wetting capacity, and only react partially or not at all with constituents of the expanded ceramic.

Abstract: A hot metal car is used for the transport of molten pig iron from a blast furnace to a steel making plant, the car having an opening through which it is filled and emptied. To restrict heat loss from the car, the opening is closed during at least one of (a) the journey from the blast furnace station to the steel making plant and (b) the journey from the steel making plant back to the blast furnace by a disposable cover which is at least partly lost into the molten iron during the course of the emptying or filling of the car at the end of the journey concerned.

Abstract: Apparatus for protection of graphite electrodes of electric arc furnaces e.g. for steelmaking to reduce loss of graphite from sides of the electrode by oxidation has at least one generally arcuate spray unit and means for moving the spray unit towards and away from a side of the electrode. The spray unit has means for spraying protective matter towards the center of its arc. The apparatus permits protection of the part of an electrode between the electrode clamp and the furnace roof without removing the electrode from the roof.

Abstract: Matter for protecting graphite electrodes of electric arc furnaces, e.g. for steelmaking, to reduce loss of graphite by oxidation, comprises particles containing both a graphite-wetting fusible matrix material and a refractory filler. Methods of making and using the particulate matter are disclosed.

Abstract: A method of prolonging the useful life of a partially consumed electric arc furnace electrode which comprises holding the electrode in a fixed position, moving a plurality of electrode protection sheets substantially radially of the major axis of the electrode towards the electrode and pressing the sheets into contact with the electrode for a sufficient time to adhere the sheets to the surface of the electrode.A frame adapted to receive at least a portion of the electrode, a plurality of carriages each reciprocable in a direction radial of the major axis of the electrode, when located in the frame, each carriage being adapted to support a protective sheet, means to urge each carriage towards the electrode, and a plurality of rollers mounted on the frame each rotatable about an axis perpendicular to the plane including the centers of the rollers and the longitudinal axis of the electrode, and each roller being biased toward the electrode.

Abstract: Injectable composition for desulphurizing molten ferrous metals, especially iron, comprises alkaline earth metal, preferably magnesium, and sintered mixture of lime and at least one fluxing agent. Magnesium is preferably 8 to 60% of composition and lime preferably is 45 to 95% of the sintered mixture. Fluxing agent is preferably alumina and fluoride. Composition enables rapid and efficient desulphurization and does not give large amounts of slag.

Abstract: A method of treating an electrode used in an electric arc furnace at a steel plant, which comprises locating the electrode to be treated in a holder therefor by bringing the electrode to the holder using the main crane at the steel plant, bringing to the electrode in the holder a crane of a relatively low lifting capacity and either(i) an applicator for applying a coating of a set of preformed tiles to the electrode, or(ii) securing means and a fresh length of electrode to be secured on top of the electrode in the holder,Respectively causing the applicator to apply the coating or the securing means to secure the fresh length to the electrode while holding the electrode or fresh length of electrode respectively in the crane of relatively low lifting capacity, and removing from the area of the holder the crane and the applicator or the securing means respectively.

Abstract: A method of prolonging the useful life of a partially consumed electric arc furnace electrode which comprises holding the electrode in a fixed position, moving a plurality of electrode protection sheets substantially radially of the major axis of the electrode towards the electrode and pressing the sheets into contact with the electrode for a sufficient time to adhere the sheets to the surface of the electrode.A frame adapted to receive at least a portion of the electrode, a plurality of carriages each reciprocable in a direction radial of the major axis of the electrode, when located in the frame, each carriage being adapted to support a protective sheet, means to urge each carriage towards the electrode, and a plurality of rollers mounted on the frame each rotatable about an axis perpendicular to the plane including the centers of the rollers and the longitudinal axis of the electrode, and each roller being biased toward the electrode.