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6616753 |
Methods and compositions for sealing subterranean zones
Methods and compositions for sealing subterranean zones penetrated by well bores are provided. The methods basically comprise the steps of introducing a sealing composition into the subterranean...
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6352585 |
Gypsum casting composition and method of casting
A multipart gypsum casting composition comprising a gypsum composition and a water composition where either the water and/or the gypsum composition contains at least two acids selected from the...
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5879446 |
Gypsum wallboard, and method of making same
A method of preparation of gypsum wallboard, as well as a core composition suitable for use therein, are disclosed. The core composition includes a slurry of calcium sulfate hemihydrate (stucco),...
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5584926 |
Cement compostion
A cement composition consists essentially of (a) from 50% to 97% by weight (calculated on the total composition) of a Portland cement clinker, the sulfur content of which is from 0.5% to 10% by...
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5158835 |
Acid rain neutralizing block, method of making such blocks and method of neutralizing acidified surface water
Blocks, weighing about 35 lbs., formed of a homogeneous mixture of about 75% gypsum and 25% lime, are strategically placed in surface water that is being damaged by acid rain, where, by timed...
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4565579 |
Nonexplosive chemical composition for gently breaking rock or concrete mass
A nonexplosive chemical composition for gently and noiselessly breaking a rock or concrete mass. The composition comprises a principal component which is prepared by calcining a starting mixture...
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4205998 |
Admixture for obtaining rapid hardening portland cement and a method by which it is to be performed
Composition for obtaining rapidly hardening portland cement containing caum sulfate and calcium oxide wherein active di-aluminium trioxide is included in the form of di-aluminium...
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4134773 |
Method of accelerated hardening and strength-increasing of different cements
A method for accelerating the hardening and increasing the strength of cets, including cement pastes, cement-sand mortars and concretes, which comprises mixing the cements with water plus an...
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4126599 |
Water-resistant shaped structure of gypsum and process for production thereof
A water-resistant shaped structure of gypsum comprising (A) calcium sulfate dihydrate formed by hardening of calcium sulfate capable of hydration reaction, (B) a calcium type filler for filling up...
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3898316 |
Calcination of gypsum
The rate of production of gypsum plaster by a continuous calcination process, in which a mass of gypsum being calcined is maintained in a fluidized condition predominantly by the water vapour...
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3872204 |
Method for continuously manufacturing shaped gypsum articles
A method for continuously manufacturing shaped gypsum articles which comprises mixing insoluble anhydrite with an accelerator for the setting, bentonite, methyl or ethyl alcohol and a proper amount...
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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...
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3847766 |
PROCESSES FOR THE TREATMENT OF CRUDE CALCIUM SULFATE TO RENDER IT SUITABLE FOR CONVERSION TO PLASTER OF PARIS
Processes for treatment of synthetic crude gypsum containing water-soluble phosphates and water-soluble silicofluorides to reduce the amounts of the said water-soluble compounds therein so that the...
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3841886 |
REFRACTORY CEMENT INCORPORATING FLUXING COMPONENT
Refractory properties are imparted to a cement prepared from non-refractory CaSO 4 by incorporation of a primary fluxing component and grog. The composition can be formulated for various uses,...
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3648994 |
PROCESS FOR CALCINING GYPSUM IN A CURRENT OF HEATING GAS
A process for calcining gypsum in a current of heating gas in a cyclone plant which comprises in combination the steps of A. introducing said heating gas into the calcining zone at a temperature...
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3364039 |
Molding composition and method of use
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3042537 |
Gypsum plaster
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