Abstract: A high density thermal insulation material is described, consisting essentially of, in parts by weight, 15 to 35 parts of lime, 15 to 35 parts of silica or other siliceous material, 40 to 70 parts of wollastonite, and 1 to 10 parts of organic fiber, and where the wollastonite content is at least 40 percent by weight of the total weight of solids, all slurried in water, then compressed to a shape-retaining body of at least 20 pcf density and indurated to form an asbestos-free, wollastonite-reinforced, crack-resistant tobermorite calcium silicate hydrate matrix thermal insulation.

Abstract: Improved method of forming zinc chromate on galvanized reinforcing bars comprising treating the bar directly with calcium chromate.

Abstract: A brick for a slide closure of a vessel for holding molten metal. The brick is made by forming and then subjecting to reducing-burninng a compound comprising an acid or neutral refractory material as a base material, graphite and a binding agent.

Abstract: The invention relates to beads used for crushing or dispersion which are formed by fusion, conversion into beads and solidification of an appropriate batch consisting essentially, on the oxide basis, of up to 85% by weight of ZrO.sub.2, a proportion of SiO.sub.2 such that the weight ratio ZrO.sub.2 /SiO.sub.2 is greater than or equal to 1.5, an optional proportion of Al.sub.2 O.sub.3 such that the weight ratio Al.sub.2 O.sub.3 /SiO.sub.2 is 0 to 1.5 and an optional proportion of Na.sub.2 O such that the weight ratio Na.sub.2 O/SiO.sub.2 is from 0 to 0.04, the batch also containing at least one of the additional oxides of MgO and CaO in proportions such that the weight ratio MgO/SiO.sub.2 is from 0.03 to 1 and the ratio CaO/SiO.sub.2 is from 0.03 to 1.45.

Abstract: Endothermic calcination of raw material is effected at a temperature lower than that required for sintering or a chemical reaction, and whereby the calcination is performed in a rotary kiln in which the raw material is in the form of a slurry consisting initially of raw mix and water, the water being partially removed to form a sludge cake which is pelletized and fed downwards through a vertical calciner in the form of a bed consisting of packed pellets, and heat from an axially arranged burner is supplied in a downward stream through the calciner, and the flue gases of the rotary kiln are fed to the calciner to form an upwards directed countercurrent gas flow turbulently passing at a high velocity through the interstices between the packed pellets.

Abstract: A refractory comprising 30 to 70% by weight of coarse refractory grain, and as an indispensable ingredient, of bonded structure for the coarse refractory grain titanium nitride, silicon carbide and alumina which are formed therein.

Abstract: This invention relates to aqueous alkali metal silicate/iron oxide pigment suspensions which are resistant to sedimentation, to a process for the preparation thereof and to the use thereof. The pigment suspensions comprise:A. from about 10 to about 40%, by weight, of iron oxide pigment,B. from about 20 to about 40%, by weight, of alkali metal silicate andC. from about 30 to about 70%, by weight, of water,Wherein at least 95% by weight of the iron oxide pigment has a particle size equal to or less than 1 .mu..

Abstract: The present invention provides a method for producing a mixture of materials of differing compositions, particularly a mixture comprised of two burned, sintered, calcined, and/or heated inorganic components, the first of said components being subjected to a heating process, particularly a burning process, and the second and other components being heated to a temperature below the temperature to which the first component has been heated.

Abstract: A refractory material for repairing blast furnaces, which is composed of 100 parts by weight of a base material chiefly consisting of at least one powdery refractory material selected from the group consisting of SiO.sub.2, Al.sub.2 O.sub.3, MgO, Cr.sub.2 O.sub.3, ZrO.sub.3, CaO and FeO.sub.2 and containing, if necessary, 0.5 to 5.0 parts by weight of iron ore powder, fibrous metal or inorganic substance, 4 to 40 parts by weight of a bituminous material consisting of a petroleum pitch or coal tar pitch in the solid, or liquid phase with a softening point ranging from 70 to 250.degree. C, and 10 to 35 parts by weight of a liquid oil consisting of a mineral oil, fish oil or vegetable oil and containing, if necessary, 0.1 to 10 parts by weight of a thermosetting synthetic resin, thermosoftening synthetic resin or natural resin.

Abstract: A mixture consisting essentially of fly ash and cement kiln dust which reacts at ambient temperature with water to produce a durable mass.

Abstract: A method is disclosed for manufacturing white cement wherein cement clinker is burnt in a kiln and prior to discharge from the kiln the clinker is contacted with a reducing agent such as fuel oil. The method further comprises discharging the hot cement clinker from the discharge portion of the kiln to a movable clinker supporting means such as a rotatable conveyor and quenching the cement clinker simultaneously with the discharge thereof from the kiln by subjecting the clinker to a spray of cooling water in a manner such that a major portion of the quenching water evaporates substantially immediately following the quenching.

Abstract: An asbestos-free composition suitable for the manufacture of shaped articles comprising (a) a water-settable inorganic binder which is one or more of a calcium silicate binder (or compounds necessary for the formation thereof), Portland cement, aluminous cement and blast furnace slag cement, (b) organic reinforcing fibres and (c) mica and/or vermiculite. The composition may be shaped on conventional shaping, e.g. boardmaking, machinery and the products have superior fire and shrinkage resistance.

Abstract: Fine-grained halide bodies are formed which have comparable optical properties to a single crystal halide body. The halide bodies are formed by press forging while an essentially constant fluid pressure is applied to the halide body.

Abstract: A glass fiber reinforced cementitious product and treated glass fibers for use in the reinforcement of cementitious materials wherein the reinforcement is in the form of bundles of glass fibers, the bundles including an alkali impervious impregnant therein to protect the glass fibers from alkaline materials liberated during age hardening of cementitious products. The use of impregnated bundles of glass fibers prevents or substantially minimizes loss in strength with aging of glass fiber-reinforced cementitious products as is characteristic of prior art products.

Abstract: A method is disclosed for burning alkali-containing raw materials such as cement raw meal in a plant having a multiple string cyclone preheater, each string containing at least two cyclone preheater stages, a kiln, and a cooler unit for cooling the burnt material from the kiln by means of air which is subsequently divided into two streams, one stream being passed through the kiln and a kiln string of the preheater, the other stream being passed through a calciner and up through the calciner cyclone string of the preheater. According to the invention, the flow of material from the penultimate preheater cyclone stage of the kiln string is directed to the calciner, at least a part of the material from the penultimate cyclone stage of the calciner string is directed to the lowermost cyclone stage of the kiln string, and at least a remaining portion of the material from the penultimate cyclone stage of the calciner string is passed to the calciner.

Abstract: An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttria-base body consisting essentially of yttria and from about 0.01 to 5 wt. % alumina.A method for preparing the transparent yttria doped with alumina is also provided comprising admixing alumina or a precursor thereof with yttria or a precursor thereof, drying the admixed powders, calcining the admixed powders and pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for about 1/4 to 6 hours at a temperature above the eutectic temperature at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.

Abstract: A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising glycerophosphoric acid or its salts, such as calcium, magnesium, potassium and sodium glycerophosphate, wherein the additive is present in an amount sufficient to increase the strength of the mix when hardened, generally in an amount of up to 0.2% by weight, preferably in an amount of between about 0.005% by weight and 0.2% by weight based upon the weight of the cement, with the range 0.01% to 0.1% by weight also being preferred.

Abstract: A versatile hydraulic basic oil well cement, compatible with retarders and most common field additives and able to perform its intended function over a wide variety of downhole conditions, particularly temperature and pressure, comprises a common moderate or high sulfate resistant clinker and a weight ratio of calcium sulfate hemihydrate to insoluble anhydrite of 20:80 to 45:55. It can be made either by adding controlled amounts of gypsum and insoluble anhydrite to the grinding circuit or by blending ground hemihydrate and insoluble anhydrite to ground clinker.

Abstract: A refractory lining repair material for steel making furnaces and the like, which consist essentially of an exothermic patching mix which may be either gunned in place or applied to furnace bottoms in the form of briquettes. Also relates to the process of furnace repair employing such mixes.

Abstract: A joint compound which is preferably asbestos-free, for use in finishing joints between wallboards, comprising a filler, a binder, and any two or all three of a water-holding agent; a slip-inducing colloid; and a non-swelling clay having sufficient pseudoplasticity to render the composition non-leveling.