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| Number | Title | Issue Date |
| 6337058 | Process for producing calcium sulfide A process and apparatus for producing calcium sulfide is provided comprising a container housing one or more drums, each drum having a substantially horizontal longitudinal center axis and containing one or more screw conveyors therein. Multiple drums are... | 01/08/2002 |
| 5635147 | Process of treating the gasification residue formed by the gasification of solid fuels in a fluidized bed In addition to ash and coke, the gasification residue contains alkaline earth metal sulfide and alkaline earth metal oxide because desulfuring agents have been supplied to the gasifier. At temperatures from 5° to 80° C. the gasification residue is mixed... | 06/03/1997 |
| 5413635 | Lime sludge treatment process Disclosed is a method and an apparatus for the heat treatment of lime sludge (CaCO3) to form burnt lime (CaO). In the method of the present invention a lime sludge feed is entrained in and thereafter dried in a gas flash dryer means to produce ... | 05/09/1995 |
| 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 |
| 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 |
| 4774064 | Conversion of calcium compounds into solid and gaseous compounds The invention relates to a process for the conversion of a calcium mineral into a calcium containing solid product and a gaseous stream which comprises subjecting the calcium mineral to a temperature in excess of about 3400 degrees Fahrenheit for less tha... | 09/27/1988 |
| 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 |
| 4563339 | Process for the preparation of magnesium chloride for use as an electrolyte in electrolytic production of magnesium metal In electrolytic production of magnesium metal the concentration of magnesium chloride in the bath is required to be replenished periodically or continuously. This magnesium chloride should be anhydrous and of certain specifications. This invention provide... | 01/07/1986 |
| 4508573 | Co-production of cementitious products A method and apparatus for thermally reacting one or more inorganic materials, the method involves the step of maintaining a flame in a combustion chamber at a predetermined reaction temperature by supplying a sufficient quantity of a hydrocarbon fuel and... | 04/02/1985 |
| 4503018 | Desulfurization of phosphogypsum Phosphogypsum is mixed with fine coal, balled, and charged to a travelling grate where the charge is heated under reducing conditions to evolve sulfur and/or sulfur dioxide for conversion into sulfuric acid.... | 03/05/1985 |
| 4431622 | Process for producing CO2, and CO2 so produced Fuel is passed (via line 13) to a fluidized fuel conversion bed (21) containing reactive CaO and CaSO4 at a fuel-oxidation temperature (e.g. 730° C.) below the temperature at which CaO reacts with CO2 to form CaCO3. The b... | 02/14/1984 |
| 4287160 | Process and shaft kiln for the burning of lime or similar bulk materials Process for the burning of lime, cement or other lumpy bulk materials in a shaft kiln using coal. Coal dust or particulated dry coal is continuously fed into a gasification chamber positioned in the center of the shaft kiln and is therein partially or ful... | 09/01/1981 |
| 4102989 | Simultaneous reductive and oxidative decomposition of calcium sulfate in the same fluidized bed Calcium sulfate is decomposed to CaO and SO2 by high temperature treatment in a fluidized bed wherein reductive and oxidative conditions are simultaneously maintained. A highly reducing gas is formed in the lower portion of the bed from partial... | 07/25/1978 |
| 3998928 | Process for calcining pellet-shaped calcium hydroxide Pellet-shaped calcium hydroxide forming part of the mixture of flux and ores in electrothermal calcium carbide furnaces is calcined. The pellets are made by granulating or briquetting moist calcium hydroxide, delivered to a sintering grate and conveyed th... | 12/21/1976 |
| 3935100 | Process for the treatment of waste waters containing sulfuric acid and/or ammonium sulfate Process for treating a waste water containing sulfuric acid and/or ammonium sulfate comprising (1) reacting said water with barium sulfide to form barium sulfate, (2) reacting the latter with carbon containing inorganic impurities, at high temperature, th... | 01/27/1976 |
