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| Number | Title | Issue Date |
| 7335254 | Alpha-type calcium sulfate hemihydrate compositions and methods of making same Disclosed is an improved alpha-type calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO4.½H2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihy... | 02/26/2008 |
| 6964704 | Calcium sulphate-based composition and methods of making same Disclosed is an improved alpha calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO4·½H2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihydrat... | 11/15/2005 |
| 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 anhydrite, and then in quenching. The process consists in: completely d... | 03/16/2004 |
| 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 screening station to remove the grits, passing the grit-fre... | 03/06/2001 |
| 6083465 | Method and apparatus for continuously calcining gypsum An apparatus for continuously calcining gypsum includes a flash calcining impact mill, a feed bin adjacent the impact mill for holding gypsum, and a gypsum feed control mechanism for supplying gypsum from the feed bin to the impact mill at a substantially... | 07/04/2000 |
| 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 region in which the water vapor partial pressure and mate... | 04/25/2000 |
| 5743954 | Method for continuous refractoryless calcining of gypsum A method and apparatus is disclosed for the continuous calcining of gypsum material in a high-efficiency, refractoryless kettle preferably heated by a multiple series of separate immersion tube burner coils, each coil operating within a specific calcining... | 04/28/1998 |
| 5643548 | Drying and separating process and plant A process and plant for drying and then separating moist salts, such as magnesium sulfite, in which the moist magnesium sulfite is heated to a temperature greater than or equal to about 200° C. in a dryer and the passed through a solid materials lock int... | 07/01/1997 |
| 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 complete homogenous fluidization through indirectly heated hot ga... | 08/01/1995 |
| 5248487 | Process for the conversion of calcium sulfate dihydrate into alpha-hemihydrate In a process for the conversion of calcium sulfate dihydrate originating in flue gas desulfurization units into an alpha-hemihydrate, a salt solution is used as a medium. The salt solution consists substantially of concentrated scrubbing liquid from the f... | 09/28/1993 |
| 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 fluorospar with sulfuric acid, removing hydrogen fluoride fr... | 12/29/1992 |
| 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 drying, deagglomerating and dehydrating. Pursuant to the in... | 12/08/1992 |
| 5139749 | Fluidized calcining process A method for enhancing the efficiency of a thermal process such as calcination. The incoming solid particulate material is preheated in the conveyor by partially cooled exhaust vapors from the thermal processor. In passage through the conveyor, the cooled... | 08/18/1992 |
| 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 cm2 /g, the fines are removed by screening, and a retarder and liquefier... | 03/03/1992 |
| 5066474 | Method for sulfur dioxide production from calcium sulfate by entrained high-temperature slagging reduction A method for production of sulfur dioxide from calcium sulfate by high temperature thermal reduction. Calcium sulfate, preferably in the form of calcined phosphogypsum, is desulfurized using a fossil fuel as a heat source, the combustion products resultin... | 11/19/1991 |
| 5015450 | Process for making calcium sulfate alpha-hemihydrate from calcium sulfate dihydrate The process makes calcium sulfate alpha-hemihydrate from finely divided calcium sulfate dihydrate by transforming the calcium sulfate dihydrate in the presence of saturated steam. A molded body is formed from the calcium sulfate dihydrate which has a plur... | 05/14/1991 |
| 5015449 | Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization The process makes calcium sulfate alpha-hemihydrate or essentially plaster of paris from finely divided gypsum made by desulfurizing flue gas obtain from a power plant fired by brown coal by transforming the calcium sulfate dihydrate in the presence of sa... | 05/14/1991 |
| 5011668 | Calcination apparatus In a method and apparatus for calcining calcium sulphate dihydrate or like heat sensitive material, in which a bed of the material is heated in a vessel (41) by the direct introduction of a hot gas through a tube (21) extending downwardly into the bed, th... | 04/30/1991 |
| 4985081 | Method of producing cement or concrete A method of producing cement or concrete, comprising the step of adding fly ash to the cement or concrete at the production stage, the fly ash containing lime and reaction products from the reaction occurring between lime and sulphur oxides in connection ... | 01/15/1991 |
| 4963513 | Coal gasification cogeneration process The present invention relates to the coproduction of a combustible gas stream usable as an energy source, a sulfur-dioxide-containing second gas stream usable as a source of oxidant in the gasification of coal, and a sulfur-dioxide-containing third gas st... | 10/16/1990 |
| 4946658 | Addition of pyritic materials to feed mix for desulfurization of phosphogypsum A pelletized mixture of gypsum, carbonaceous material and pyrite is charged to a travelling grate where the charge is heated under suitable conditions to produce a solid sintered material which has a broad spectrum of applications due to its chemical and ... | 08/07/1990 |
| 4935211 | 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 fluorospar with sulfuric acid, removing hydrogen fluoride fr... | 06/19/1990 |
| 4744961 | Submerged combustion calcination Gypsum is calcined by contacting it with the hot gases spewing out of a combustion tube submerged in the mass of gypsum. The formation of dead-burned anhydrite is reduced by surrounding the combustion tube with a second tube called a draft tube. Gypsum pa... | 05/17/1988 |
| 4744963 | Highly efficient calcination of gypsum to hemihydrate Hydrodynamic pumping of the fluidized calcining mass in a kettle is set up by the continuous flow of the mass to and from heating rods immersed therein which are constantly emitting at least about 1 British Thermal Unit of heat per minute per square inch ... | 05/17/1988 |
| 4744969 | Process for the conversion of coal and gypsum to valuable products The present invention relates to the coproduction of a combustible feed gas stream useable as an energy source and a sulfur-containing second gas stream useable as a feedstock for the production of sulfuric acid. The process includes heating coal in the p... | 05/17/1988 |
| 4626199 | Submerged combustion calcination Gypsum is calcined by contacting it with the hot gases spewing out of a combustion tube submerged in the mass of gypsum. The formation of dead-burned anhydrite is reduced by surrounding the combustion tube with a second tube called a draft tube. Gypsum pa... | 12/02/1986 |
| 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 method and apparatus utilize a two-stage suspension preheat... | 02/11/1986 |
| 4533528 | Process for continuously calcining gypsum to low dispersed consistency stucco Wet chemical gypsum cake may be directly fed to a continuous kettle calciner to produce a stucco having lowered dispersed consistency. Pre-drying of the chemical gypsum is eliminated and the thus produced stucco may be used in the formulation of building ... | 08/06/1985 |
| 4523906 | Device for drying gypsum Cold, wet gypsum is admixed to a moving bed of hot solid particles of a heat-retaining material. The mixture is fed to a moving bed type drier where it is agitated while the released vapors are withdrawn. After discharge from the drier, dry gypsum is sepa... | 06/18/1985 |
| 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 microns and 80 microns and filtered, which filter cake is s... | 03/05/1985 |
| 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 by heating in an oxygen containing gas, and thereafter the ... | 01/22/1985 |
| 4455285 | Heat treatment of material A method for heat treating a material such as gypsum mineral, consists in burning a fuel in a combustion bed which is in heat exchange contact through bounding walls with beds of the material to be heated. Combustion gases are passed from the combustor th... | 06/19/1984 |
| 4432954 | Production of gypsum hemihydrate with waste heat, aqueous H2 SO4 and sulfuric acid salts Alpha gypsum hemihydrate is obtained by calcining calcium sulfate dihydrate, generated with flue-gas desulfurization of power plants or by chemical process, e.g. in the production of phosphoric acid. The calcining process comprises producing initially a d... | 02/21/1984 |
| 4360386 | Treating calcined gypsum with solubilizing agent A process for producing a healed stucco of low water demand is disclosed in which calcined gypsum is treated with an aqueous solution of a gypsum solubilizing agent, preferably in an impacting blender while grinding the calcined gypsum to increase its sur... | 11/23/1982 |
| 4265964 | Lightweight frothed gypsum structural units Compositions useful for lightweight structural units such as wallboard panels and the like are provided in which low density expandable thermoplastic granules or particles that have been expanded are used in conjunction with a cementitious base material, ... | 05/05/1981 |
| 4247518 | Apparatus for the thermal conversion of gypsum An apparatus for effecting the thermal conversion of gypsum to calcium sulfate hemihydrate includes a reactor having a series of fluidized bed compartments containing separate heat exchangers and defined by partitions each provided with an opening which i... | 01/27/1981 |
| 4238238 | Calcining kettle having means for returning stack exhaust gas to calcining mixture A calcining apparatus comprising a kettle, a heating chamber for heating the outside of the kettle, a stack for exhausting gas from the heating chamber, a duct connected at one end to the stack and having the other end extending for a limited distance int... | 12/09/1980 |
| 4176157 | Calcining calcium sulphate dihydrate A method and apparatus for calcining calcium sulphate dihydrate in a calcination vessel in which the dihydrate is heated in the vessel to calcination temperature not only by heat applied to the exterior of the vessel but also by hot gas, especially hot ga... | 11/27/1979 |
| 4162170 | Method of obtaining granulated and defluorated phosphogypsum A combined method for granulation and defluoration of phosphogypsum, suitable for subsequent fluidized bed disassociation to lime and sulphur dioxide is described. The new phosphogypsum, obtained from phosphoric acid production, containing residual combin... | 07/24/1979 |
| 4113836 | Continuous gypsum calcination process and kettle therefor Continuous calcination of gypsum is provided by uniformly feeding uncalcined gypsum into the calcining batch in a kettle to a location below the surface but above the uppermost agitator, and allowing calcined gypsum to be discharged from the kettle throug... | 09/12/1978 |
