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7628851 |
Bone cement compositions having fiber-reinforcement and/or increased flowability
The present invention relates in general to implantable compositions, and method for preparing same, containing a calcium salt-containing component, optionally demineralized bone, a plurality of...
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7556685 |
Composition of architectural papier-mâché and articles made therewith
The invention is a composition of an architectural papier-mâché, and articles made therewith. Articles formed from using the architectural papier-mâché have excellent weather resistance, and...
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7427321 |
Foamed fireproofing composition and method
Disclosed are formulations adapted to form a foamed cementitious composition, the foamed cementitious composition itself, a method of forming a hydraulic binder foam, and a method of conveying and...
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7150787 |
Polymer-modified gypsum composition
A composition including two components is provided. When the two components are admixed in the method of the invention a polymer-modified gypsum composition is provided. The admixture exhibits a...
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7070647 |
Cement composition
A novel cement is alkalescent, capable of solidifying a wide range of soil and applicable to biological environment. The cement composition contains 100 parts by weight of magnesium oxide, 5 to 25%...
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6767647 |
Antimicrobial wallboard
A gypsum wallboard that exhibits antimicrobial characteristics is disclosed. A method for making the wallboard is also disclosed. Suitable antimicrobial agents that may be applied to the wallboard...
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6730162 |
Hydraulic binder resulting from mixing a sulfate binder and a binder comprising the mineral compound C4A3{overscore (S)}
The present invention relates to a method of preparing a hydraulic binder wherein at least the following two binders are mixed together: a) a first hydraulic binder having as one of its main...
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6706113 |
Method for producing an anhydrite III or α based hydraulic bonding agent
A process for synthesizing a hydraulic binder based on natural calcium sulfate (gypsum), the process consisting in heating the calcium sulfate to obtain a large proportion of anhydrite III or α...
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6627065 |
Liquid galvanic coatings for protection of imbedded metals
Coating compositions and methods of their use are described herein for the reduction of corrosion in imbedded metal structures. The coatings are applied as liquids to an external surface of a...
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6607592 |
Antishrinkage agent for concrete or mortar
The invention concerns a composition in dry state for mortar or concrete, comprising a cement and an antishrinkage agent. The invention is characterized in that the antishrinkage agent consist of a...
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6406537 |
High-strength joint compound
A composition comprising calcined gypsum, trimetaphosphate ion, and a water-soluble linear polymer formed by the addition reaction of ethylene oxide and/or alkoxy-substituted ethylene oxide with...
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6299970 |
Fire-resistant gypsum fiberboard
Fiberboards are provided containing at least about 65 wt. % calcium sulfate dihydrate derived from hemihydrate or anhydrous gypsum, and at least about 7 wt. % pulped paper fibers. The boards are...
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6197200 |
Method of purifying flue gas waste slurries for use in gypsum production
A method of purifying a flue gas desulfurization aqueous waste slurry containing calcium-sulfur salts and residual solid grits, fly ash, carbon and oils by supplying the aqueous waste slurry to a...
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6174362 |
Processing equipment and method for a pulverulent calcium sulphate material and novel hydraulic binder
A method for processing a pulverulent calcium sulphate material in order to obtain a hydraulic binder is described, including combining the following two successive processing steps: (a) heating...
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6054101 |
Method and Device for heat-treating plaster
Disclosed is a method and device for heat-treating plaster which is calcined to form hemihydrate plaster or anhydrite. Calcining to form hemihydrate plaster is carried out in at least one fluid bed...
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5961712 |
Method for making shotcrete and such compositions
The invention provides cementitious mixtures, particularly for use as shotcrete binding materials. The resultant shotcrete has characteristics of rapid setting as low as 5 to 10 minutes, high early...
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5910215 |
Self-leveling fluid mortar including calcium sulfate and lime
The invention relates to a self-levelling fluid mortar including calcium sulphate, granulates, lime, water and either a silica and a compound containing alumina or a pozzuolana, and to a screed...
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5851282 |
Portland cement clinker and use thereof
A Portland cement clinker free of C 4 A 3 S having the following proportions of clinker phases, in % by wt.: --C 3 S: 40 to 80 --C 4 AF: <20 --C 2 S: <30 --C 3 A: <20 and a...
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5626667 |
Process and apparatus for producing SO.sub.2 -containing gas and cement clinker from waste gypsum
A method and apparatus for producing SO 2 -containing gas and cement clinker by splitting waste gypsum and anhydrite, using paper fibers as the reducing agent, and firing the splitting residue...
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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...
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5454866 |
Grout composition
This invention relates to a grout composition comprising a Portland cement, a high alumina cement, anhydrous calcium sulphate, an effective amount of a lithium salt and an effective amount of a...
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5437850 |
Method for calcining moist gypsum
Both the drying and also the removal of the water crystalization take place carefully in a respective fluidized bed apparatus (A, B) without any danger of overheating. This is achieved by a...
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5356472 |
Portland cement clinker and portland cement
The present invention pertains to a portland cement clinker containing the following amounts of clinker phases, in wt. %: C 3 S: 30 to 80, C 4 A 3 S: 5 to 30, C 4 AF: <30, C 2 ...
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5174972 |
Fluorogypsum waste solidification material
A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting...
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5169617 |
Method of treating produced gypsum
A method for treating produced gypsum and, in particular, a method for treating flue-gas desulfurization gypsum forms highly active, modifiable gypsum binders of high strength with simultaneously...
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5135805 |
Method of manufacturing a water-resistant gypsum composition
A method for incorporating siloxane into a water-resistant, gypsum-based article is disclosed, comprising, (A) adding said siloxane to water; (B) mixing said siloxane/water mixture with calcined...
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5116417 |
Composition and method for agglomerating ore
A binder composition is shown for agglomerating ore fines in a heap leaching ore recovery process. The binder composition comprises a calcareous component, a sulfate component and a...
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5104451 |
Use of fluidized bed ash in a finishing mortar
A mortar for the production of a floor is prepared from a mixture of anhydrite binder, sand, fluidized bed ash from the fluidized bed firing of a sulfur-bearing fuel such as coal, water and a...
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5008055 |
Process for pelletizing highly reactive powders
A method for forming strong and durable pellets from dust collected from stack gases. The dust includes CaSO 3 , CaSO 4 and unreacted CaD. A portion of water required for total hydration with the...
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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...
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4818287 |
Fiber reinforced plaster molds for metal casting
An improved composition and process for preparing plaster molds used in casting nonferrous metals is provided wherein plaster molds are prepared from particulate calcium sulfate molding plaster...
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4508574 |
Process for improving the fluidity and conveyability of moist calcium sulfate precipitates
A process for improving the fluidity and conveyability properties of moist calcium sulfate precipitates, having a free water content of more than about 5% by weight, which entails mixing quicklime...
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4495162 |
Preparation of a calcium sulfate anhydrite material of low chloride content
A calcium sulfate anhydrite material is prepared from a spent absorbent resulting from desulfurization of flue gases. First the sulfite in the spent absorbent is oxidized into sulfate, preferably...
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4457781 |
Method for solidifying waste slime suspensions
Solidification of colloidal argillaceous matter in essentially non-settling, aqueous slime media into a solid stable matrix is accomplished by mixing such slime with a hydratable calcium sulfate...
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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...
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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...
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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...
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4286994 |
Method for the use of the gypsum occurring in flue gas desulfurizing installations, operated on a lime basis
Method for the use of flue gas desulfurizing gypsum occurring in flue gas desulfurizing installations operated on a lime basis, characterized by mixing the flue gas desulfurizing gypsum with...
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4166750 |
Anhydrite concrete and method for preparing building elements
The invention disclosed is for a new anhydrite concrete prepared by combining suitable quantities of an anhydrite binder, at least one anhydrite setting catalyst, heavy granulates and water. The...
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4120645 |
System for handling high sulfur materials
Sulfur oxides have a strong affinity for free lime and readily form gypsum anhydrite. By utilizing 2200° F or higher on-gas containing reduced quantities of sulfur to the preheat zone of a...
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4108677 |
Process for treating waste sludge from combustion plant desulfurization units and cementitious product of the process
Aqueous alkaline desulfurization treating units for combustion gases generate as a product an aqueous sludge containing sulfur compounds of calcium. Many such sludge products contain more than 30...
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4086099 |
Method of preparing plaster
A method of preparing plaster by brief contact between gypsum and a hot gas. The method comprises introducing the gypsum through the axial tube of a nozzle, around which a helical stream of hot...
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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...
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4016240 |
Production of synthetic anhydrite
The process for the production of synthetic anhydrite of uniform quality from the residue resulting from the production of hydrofluoric acid and containing calcium sulfate and acid, comprising...
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3954492 |
Calcium sulphate anhydrite mortar
Particulate anhydrite, of whose particles from about 2 to 6% by weight have a particle size greater than about 5 mm, from about 13 to 23% by weight have a particle size of from about 5 to 3.15 mm,...
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3915724 |
Method for the manufacture of an improved anhydrite
A method for the manufacture of an improved anhydrite which adjusts and accelerates elution of various components of the hydrates of hydraulic cements at normal temperature and at elevated...
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3906083 |
Process for the conversion of anhydrite into gypsum
Gypsum and gypsum plaster products can be made from an anhydrite or mixed anhydrite and gypsum starting material, of natural origin or derived chemically as a byproduct, by mixing the powdered...
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3900333 |
Mortars and the like
Particular anhydrite, of whose particles from about 2 to 6% by weight have a particle size greater than about 5 mm, from about 13 to 23% by weight have a particle size of from about 5 to 3.15 mm,...
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3650689 |
ANHYDROUS CALCIUM SULPHATE
Production of anhydrous calcium sulphate by autoclaving gypsum in saturated steam at a temperature of at least 205° C.
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3547581 |
PROCESS FOR REMOVING FLUORINE AND PHOSPHATE FROM GYPSUM PRODUCED IN THE MANUFACTURE OF PHOSPHORIC ACID
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