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7455728 Method for retarding plaster setting and plaster preparation  
A method for retarding plaster setting and plaster preparations, relies upon a composition including a. tartaric acid in an amount of at least 0.01 to 1.0 weight % (based on plaster amount); b....
7337587 Construction assembly of plaster boards and a method of assembling a plurality of plaster boards  
A construction assembly includes a plurality of plaster boards, each of the plaster boards having a plaster body and at least one sheet of liner, the liner including an inner surface attached to...
6902614 Perlited Portland cement plaster joint compound additive with lime  
A composition and method for treating a surface is described. In one embodiment, the composition comprises about 10% to 90% by weight of cement, about 10% to 90% by weight of plaster, about 0.01%...
6171387 Reversible agglomeration of fine particle plaster of Paris  
A method for the reversible agglomeration of fine particles of plaster of Paris (CaSO 4 .1/2H 2 O) and agglomerates made by the method which comprises agitating the fine particles in the presence...
5968258 Method of making cement from base metal smelter slag  
A method of making cement from base metal smelter slag produced by a nickel, copper, lead or zinc smelter, includes crushing the slag with a source of calcium sulphate to a size of less than about...
5904765 Cementation slurries for improvedly encasing reinforcing elements therefor  
Cementation slurries well suited for encasing reinforcing elements therefor, for example prestressed steel cable, while reducing the risk of embrittlement thereof, contain from about 1.5% to 3% by...
5873936 Cement composition self-leveling floor coating formulations and their method of use  
A cement composition comprising fine aggregate, preferably sand, in an amount of about 10 to about 25 wt %; blast furnace slag cement, in an amount of about 20 to about 35 wt %; gypsum, in an...
5858083 Cementitious gypsum-containing binders and compositions and materials made therefrom  
Cementitious binders include calcium sulfate beta-hemihydrate, a cement component comprising Portland cement, and either silica fume or rice-husk ash. The silica fume or rice-husk ash component is...
5731034 Method of coating paper  
A method of coating paper with a paper coating composition having a solids concentration of at least 45% by weight, consisting essentially of an aqueous cationic dispersion of a particulate calcium...
5522928 Binder for interior plasters  
A novel binder for interior plasters having a calcium sulphate component capable of binding in the presence of water and a finely divided residual material component comprised primarily of calcium...
5472500 High strength, abrasion resistant veneer plaster  
A veneer plaster having strengths of substantially greater than 3,000 psi, abrasion resistance of penetrations less than 0.04 inch with 1,000 cycles of a five-pound brush using a 3M Granule...
5387282 Structural cementitious composition and method of manufacturing the same  
A structural article of manufacture having a specific gravity less than about 1.5, composed of a compressed, dry cementitious composition comprising a particulate aggregate substantially free from...
5173284 Process for preparation of purified calcium sulfate in an aqueous medium  
A process for the preparation in an aqueous medium of purified calcium sulfate, with high whiteness, characterized in that it comprises: a) the formation of an aqueous solution by dissolution of...
5093093 Process for preparing calcium sulfate alpha hemihydrate  
In a process for preparing calcium sulphate alpha hemihydrate essentially the form of primary crystals, the hemihydrate is milled to specific surface area of 1200 to 4000 cm 2 /g, the fines are...
5071484 Cementitious compositions and method  
A cementitious composition capable of forming an early high strength cement when admixed with a liquid comprising a cementitious material of a specific chemical composition, surface area, and...
5051221 Method for the manufacture of a moist mixture from plaster of Paris and fibres  
A moist mixture of plaster of Paris and fibres is produced due to the fact that before mixing with the fibres, a considerable quantity of water is supplied to the plaster of Paris, which leads to a...
4954134 Agglomeration of gypsum, limestone, or gypsum-limestone mix  
An improved process for economically and effectively granulating solid, finely-divided, particulate feedstock comprising phosphogypsum, limestone, or mixtures comprising sulfogypsum, natural or...
4931099 Self-levelling mortar mixture  
A self-levelling mortar mixture containing anhydrite, activator salts, plasticizers, surfactants and water is improved by providing the anhydrite in the form of both coarse-grained particles and...
4859243 Carbon fiber-reinforcing gypsum models and forming molds, gypsum powder materials for making such models and molds, and a method for producing them  
Gypsum models and molds made of a dihydrate gypsum (CaSO 4 2H 2 O) having uniformly dispersed therein carbon fibers having a predetermined length in a defined range of amount are described....
4569831 Process and apparatus for calcining gypsum  
An apparatus and process for calcining gypsum is disclosed which utilizes a flash furnace for rapidly calcining fine particulate gypsum while the material is suspended in a stream of hot gas. The...
4544542 Method for oxidation of flue gas desulfurization absorbent and the product produced thereby  
A method for treating the fine-grained spend absorbent (primarily calcium sulfite and calcium sulfate) from a dry flue gas desulfurization process. The absorbent, having a small amount of binder...
4502901 Manufacture of gypsum board from FGD gypsum  
By-product gypsum, which is formed during a flue gas desulfurization process, (FGD gypsum) is carefully formed as an aqueous slurry of crystals having a mean particle diameter of between about 35...
4445937 Pneumatic stowing of construction material comprising calcium alpha- and beta-sulphate hemihydrates  
An improved method for pneumatic stowing of calcium alpha-sulphate hemihydrate, calcium beta-sulphate hemihydrate or mixtures thereof using natural anhydrite, limestone or mixtures thereof is...
4424196 Phosphohemihydrate process for purification of gypsum  
A wet process for producing phosphoric acid and phosphohemihydrate by acidulation of phosphate rock. A strong phosphoric acid is obtained with concomitant production of an improved calcium sulfate...
4402922 Process for rapid conversion of fluoroanhydrite to gypsum  
A process for making an industrially usable gypsum from fluoroanhydrite in which fluoroanhydrite is contacted with a fluid reaction medium slurry containing soluble sulfate ions and a substantial...
4388292 Process for reducing radioactive contamination in phosphogypsum  
A process of two crystallization stages for reducing radioactive contamination of phosphogypsum is disclosed. In the process anhydrite crystals are obtained through dehydration of the radiation...
4363667 Cementitious composition and cement produced therefrom  
A cementitious composition comprising (a) at least one hydraulic cement, (b) water, (c) at least one polymeric water-soluble or water-dispersible additive which is capable of aiding in the...
4353749 Process of producing a useful soil cement product from industrial chemical waste  
Acid industrial waste containing calcium sulfate is reacted and neutralized with another alkaline industrial waste preferably containing iron oxide and aluminum oxide, mixed with water and...
4344925 Ozone whitening of synthetic gypsum  
A process for the whitening of phosphogypsum comprising treating a phosphogypsum in aqueous suspension with an amount of ozone equal to at least 150 parts by weight per million parts by weight of...
4340521 Pressure compacting of settable plaster compositions  
A settable molding composition comprising a mix of synthetic plaster with an extraneous water source, including a "wet" synthetic gypsum or a mixture of same and free water, is readily pressure...
4309391 Lump process alpha gypsum  
An improved "lump" process for producing alpha gypsum, calcium sulfate hemihydrate, from natural gypsum rock of the type wherein lumps of gypsum rock particles (a minimum of about 1/2 inch or 1.3...
4296089 Inorganic fibers  
The invention provides inorganic fibers based on calcium sulfate dihydrate or calcium sulfate aluminate hydrate (or their dehydration products), wherein the ratio of average length to diameter of...
4292085 Method for converting into a non-polluting particulate product the ferrous sulphate obtained in the production of titanium dioxide by the sulphate process  
Ferrous sulphate heptahydrate obtained as a by-product of the production of titanium dioxide by the sulphate process is converted into a non-polluting, free-flowing particulate neutralization...
4286995 Mica-free joint compound  
A joint compound, having crack resistance substantially equal to joint compounds containing mica, wherein the mica has been replaced by low length to width ratio gypsum crystals formed by the...
4278468 Gypsum fire barrier for cable fires  
Electrical power, instrument and communication cables constructed with combustible coverings can provide a pathway by which fire might spread. Cable fires within a room or compartment can be...
4261757 Refractory plaster  
A refractory plaster containing semi-hydrated calcium sulphate, mineral fibres and a mineral filler material. This plaster has outstanding fire-retardant properties at temperatures of up to 1400°...
4242141 Rapid-setting dry packing mix for eliminating bore hole troubles and method of manufacture thereof  
A rapid-setting dry packing mix for eliminating bore hole troubles contains: 40 to 50 percent by weight of cement powder, 50 to 60 percent by weight of gypsum or alabaster, 0.01 to 3.0 percent by...
4234345 Method for producing hard plaster of paris  
Fast-setting alpha calcium sulfate hemihydrate made from calcium sulfate dihydrate by hydrothermally recrystallizing calcium sulfate dihydrate to form a mixture containing 95%-99% by weight alpha...
4201595 Process for preparing calcined gypsum and gypsum board  
A process for preparing calcined gypsum (stucco) which comprises treating a mass of calcined gypsum by adding, with thorough blending, small portions of water (about 1-10% by weight) to the...
4183763 Gypsum-based granules and method of production  
Calcium sulfate hemihydrate is processed into agglomerates such as granules and/or macrogranules by addition of an aqueous binder to a fluidized charge of calcium sulfate hemihydrate particles. The...
4132565 Accelerator for gypsum slurry  
An improved accelerator is produced by impact and ball mill grinding gypsum board so that gypsum particles have size of less than one micron in diameter, in the absence of an additive to inhibit...
4096944 Cartridge for grouting an anchor element in a hole of a support structure  
A grouting cartridge is described for placing in a hole of a support structure. The cartridge is capable of rapidly forming a solid grout about an anchor element where the anchor element is thrust...
4049866 By-product gypsum fillers for mica-free joint compounds  
A filler for a mica-free joint compound, comprising by-product gypsum having a mean particle size between about 11 and about 12 microns, a percentage by weight of particles smaller than 1 micron of...
4038094 Molding composition  
A molding composition, made of earth products, which is particularly suitable for producing urns and frames for mausoleum niches and other decorative articles. In its dry state the molding...
4029512 Method for the preparation of fibrous insoluble calcium sulfate anhydrite  
A process is described for the formation of fibrous insoluble calcium sulfate anhydrite, the fibers thereof having specified dimensions. A dilute aqueous suspension of gypsum and, if desired, a...
3956456 Gypsum calcination  
The calcination of gypsum by continuously feeding fine gypsum spirally downwardly through a cylindrical zone into which heated air is injected almost tangentially forming a spiral air conveyor. The...
3913571 Plaster casts  
Bandages coated and/or impregnated with plaster of Paris provide materially stronger plaster casts when the plaster of Paris is the hydrothermally produced alpha form of calcium sulfate hemihydrate...
3861930 CONSTRUCTION MATERIALS  
A sulfur oxide gas is passed through a fluidized bed of porous calcium oxide particles to form a lamination or coating of calcium sulfate over the external surfaces of the calcium oxide particles....
3847634 SYNTHETIC LIGHTWEIGHT BUILDING MATERIAL  
A synthetic lightweight building material suitable for use as aggregate, building blocks, bricks, facing masonry such as tile, and lightweight decorative stone, is prepared by mixing gypsum...
3652309 RETARDED GYPSUM PLASTER FOR USE IN LONG SET AGGREGATED MORTAR APPLICATIONS  
The process of making a gypsum plaster possessing a high degree of stability over extended periods of time and having a set time of at least 4 hours in aggregated mortar applications by providing a...
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