Abstract: 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.

Abstract: This invention relates to refractory mixes produced by mixing a refractory material with an organic binder and heating to a temperature of typically from about 50° C. to about 100° C. to form a stable composite granulate. The refractor mixes comprise a major amount of a refractory material and a minor amount of a binder composition comprising (a) condensed tannin and (b) furfuryl alcohol. The refractory mixes are used to prepare shaped (e.g. bricks) and unshaped (e.g. blast furnace tap holes, troughs, and tundish liners) refractory products. The invention also relates to a process for preparing the refractory products using the refractory mixes.

Abstract: Disclosed is a taphole plugging composition for metal melting apparatus, the composition comprising (a) a refractory aggregate having a maximum particle size of 5 mm or less, (b) graphite and silicon nitride each having a maximum particle size of 0.2 mm or less, (c) a refractory clay, (d) a compatibilized binder mixture comprising a phenolic resin, a ketone compound and a pitch, and (e) an organic fine fiber.

Abstract: The subject invention relates to a foundry binder system which cures in the presence of a volatile amine curing catalyst comprising (a) an epoxy resin,(b) an organic polyisocyanate, (c) a reactive unsaturated acrylic monomer or polymer, and (d) an oxidizing agent. The foundry binders are used for making foundry mixes. The foundry mixes are used to make foundry shapes which are used to make metal castings.

Abstract: This invention relates to polyurethane-forming foundry binder systems and foundry mixes which comprise a foundry aggregate, said foundry binder system, and a liquid amine curing catalyst. The binder system comprises a polyol component containing a polyether polyol and a monomeric glycol, and an organic polyisocyanate component. The foundry mixes are used to prepare foundry shapes made from foundry mixes by a no-bake process.

Abstract: The object of the present invention is to develop an innovative mud material which has the properties of a resin-type mud material for improving the working environment, which mud material is capable of increasing the depth of an iron tap hole and of improving the adhesion to mud material deposited in a furnace at high heat, such adhesion being a drawback of the conventional art.This invention provides a mud material used for an iron tap hole in a blast furnace, wherein 8 to 20 wt % of a solution of a novolak-type phenolic resin having a specific number-average molecular weight and serving as a binder is added to and blended with a refractory aggregate used as a conventional mud material.

Abstract: Emissive compositions are described that can be applied as a coating to the surface of an investment casting mold to increase or decrease the rate of cooling of a casting within the mold. A coating that decreases the rate of cooling of an investment casting within an investment casting mold may comprise a compound having an emissivity less than the emissivity of the mold; a high temperature glass-forming material and a solvent to make a slurry. Similarly, a coating that increases the rate of cooling may comprise a compound having an emissivity greater than the emissivity of the mold; a low temperature glass-forming material and a solvent to make a slurry. Also disclosed in a method of investment casting wherein an emissive composition is applied to the investment casting mold.

Abstract: An refractory plastic comprising a refractory aggregate and a bonding and plasticizing agent consisting essentially of a powdered novolak resin and a solvent; said agent being present in an amount sufficient to plasticize said refractory.

Abstract: A slow setting resin-bonded taphole mix consisting essentially of a uniform admixture of a refractory grog and a bonding composition consisting essentially of a low volatile high softening point phenolic resin, a high boiling point for said resin, and a clay, and the method of using said mix to seal tapholes.

Abstract: A composition for modeling material comprising a synthetic resin, a wooden powder and an oil formulated and kneaded. The synthetic resin is a rubber-reinforced styrene resin. The oil is a hydrocarbon oil having a specified viscosity, and restriction of the content of an aromatic ring-forming carbon. The composition is formed into flat board, round rod, etc. and used as modeling material for shaping patterns or models.

Abstract: A particulate material adapted to be poured into the opening in the bottom of a top pouring ingot mold, tamped in the opening and then cured therein to form a mold plug is comprising of a plug forming aggregate and first and second binders of thermosetting resinous material having different temperatures at which polymerization of the corresponding resin commences.

Abstract: The exposed surface of a molten metal, ferrous or non-ferrous in a ladle is covered by an expanding insulating ladle covering compound that is capable of absorbing and removing non-metallic inclusions in a predictable volume. The compound includes burnt lime in amounts between 56% and 60% by weight, aluminum dross, including Al.sub.2 O.sub.3 in amounts between 22% and 30% by weight, fluorspar in amounts between 7% and 9% by weight, and acid treated graphite in amounts between 1% and 4% by weight.

Abstract: A water-based paste which is curable to a flowing glass which is made generally from boric acid, silica flour, or diatomite silica. Generally, silica flour is added for pipe sealer or diatomite-type silica for cap sealers. Optional additives are latex and Kelzan for modifying rheology and trisodium phosphate to fine control the softening point. These compositions may be utilized in standpipes and collecting mains in coke ovens. The softening point of the composition is selected so that it is compatible with the operation of the coke oven. Softening temperatures for these compositions range from about 400.degree. C. to about 750.degree. C. and the boric acid and silica components were selected with a particle size ranging from about 44-210 microns.

Abstract: Compositions for forming carbon-containing refractory brick or shape comprising a refractory filler, a binder for said filler and a hardening agent for said binder, said binder comprising a mixture of polymers formed by the homopolymerization of resorcinol. Compositions for forming a carbon-containing refractory brick or shape as above described are also disclosed in which a basic refractory filler is employed and hardening agents are unnecessary. Methods of forming carbon-containing refractory brick or shape are also disclosed involving milling of a dry binder comprising a mixture of polymers formed by the homopolymerization of resorcinol with the refractory filler or mixture of a solution of such a binder material with the refractory filler, either of which may be conducted at ambient temperature.

Abstract: A non-aqueous taphole mix comprising a binder, a non-aqueous solvent for the binder and a refractory filler, the binder comprising a mixture of polymers formed by the homopolymerization of resorcinol and a hardening agent. Also disclosed are carbon-containing specialties comprising a binder, a solvent for the binder, and a refractory filler, the binder comprising a mixture of polymers formed by the homopolymerization of resorcinol and a hardening agent.

Abstract: Tris (hydroxymethyl) nitromethane is used as the formaldehyde-source, cross-linking agent for a phenol-formaldehyde or resorcinol polymer resin binder system for a plugging refractory to enhance the plugging refractory's ability to withstand residence periods in a mud gun without premature solidification.