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| Number | Title | Issue Date |
| 7815889 | Method and apparatus for pressurized calcination of gypsum A method for calcining gypsum in a pressurized reactor by injecting combustion gases and air into the pressurized reactor to create a fluidized bed of gypsum, and heating the fluidized bed of gypsum in the pressurized reactor sufficiently to form a calcined hemihydr... | 10/19/2010 |
| 7267811 | Fuel reformer catalyst and absorbent materials Materials that are useful for absorption enhanced reforming (AER) of a fuel, including absorbent materials and catalyst materials, and methods for using such materials for the conversion of carbon-based fuels to a H2-rich product gas. The materials can be... | 09/11/2007 |
| 7264788 | Fuel reformer catalyst and absorbent materials Materials that are useful for absorption enhanced reforming (AER) of a fuel, including absorbent materials and catalyst materials and methods for using the materials. The materials can be fabricated by spray processing. The use of the materials in AER can produce a ... | 09/04/2007 |
| 7179438 | Methods and apparatus for recovering gypsum and magnesium hydroxide The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide ... | 02/20/2007 |
| 7018464 | Body pigment and process for preparing the same A body pigment with a good skin feel for cosmetics is provided which has an appropriate crumbling property and combines slipping property and adhesiveness without compromising oil absorption. The body pigment is comprised of a metal-containing compound and has a str... | 03/28/2006 |
| 6997119 | Combustion emissions control and utilization of byproducts A process for controlling both fireside ash deposits and corrosion, and fouling, corrosion, and emissions due to SO3 formation within a fossil-fuel-fired combustion system, such as a furnace forming part of an electrical power generating plant. A solution... | 02/14/2006 |
| 6428760 | Method for desulfurizing exhaust gas The present invention relates to the improvement of a replenishment method of a magnesium-based compound and to the improvement of a double decomposition method, which can be used in a magnesium hydroxide desulfurization method. In the improved replenishm... | 08/06/2002 |
| 6395084 | Platelet/flake magnesium oxide, methods of making the same, and magnesium oxychloride/oxysulfate ceramic materials Magnesium oxychloride and magnesium oxysulfate materials and methods of making the same are disclosed. The materials are cured reaction products of a magnesium oxide, and an aqueous magnesium salt solution. The aqueous salt solution preferably has a speci... | 05/28/2002 |
| 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 |
| 6214313 | High-purity magnesium hydroxide and process for its production Magnesium hydroxide of high purity, having a fine particle size suitable for use in flame retardants and other high-end uses, is produced by utilizing flue gas desulfurization system process slurry as feedstock; the production process is absent energy-int... | 04/10/2001 |
| 6083862 | Cyclic process for oxidation of calcium sulfide Calcium sulfide particles in mixtures with carbon particles, as in coal gasifier waste, are converted to calcium oxide by repeated cycles of oxidation and reduction by utilizing the carbon as a source of the reducing gas required for the treatment. The tr... | 07/04/2000 |
| 5891320 | Soluble magnesium hydroxide A clear solution and a method for preparing the solution which has a pH in the range of from 10 to 13.9 and containing sulfate ions in a concentration range less than 500 parts per million. The solution is prepared by mixing two solutions in which one sol... | 04/06/1999 |
| 5653955 | Cyclic process for oxidation of calcium sulfide An improved process for converting particles containing calcium sulfide into calcium oxide by subjecting the particles to repeated cycles of oxidation and reduction. The impenetrable layer of calcium sulfate which forms during the oxidation phase of each ... | 08/05/1997 |
| 5614158 | Process for removing sulfur dioxide from gases and producing gypsum and purified magnesium hydroxide In a process for removing sulfur dioxide from a gas stream using an aqueous solution of magnesium scrubbing components and subsequent oxidation of the magnesium sulfite produced which is regenerated by addition of lime, a pure magnesium hydroxide product ... | 03/25/1997 |
| 5580377 | Plate barium sulfate and process for producing the same A plate barium sulfate is described, which has a particle size of from 1 to 100 μm or from 5 to 150 μm, wherein neither a sulfide nor a soluble barium salt is detected by an analysis method based on the Japanese Cosmetics Material Standard. The process ... | 12/03/1996 |
| 5508012 | Methods for recovering sodium sulfides from a sulfur scavenging reaction A method is provided for the regeneration of a scavenging compound that has been reacted with hydrogen sulfide. Regeneration is accomplished through the use of calcium oxides and sodium hydroxide. Sodium sulfide is recovered from the regeneration process ... | 04/16/1996 |
| 5433939 | Cyclic process for oxidation of calcium sulfide A cyclic process of subjecting calcium sulfide particles to alternating oxidizing and reducing conditions. The impenetrable shell of calcium sulfate which forms during the oxidation phase of the cycle is destroyed by the subsequent reducing phase. By repe... | 07/18/1995 |
| 5264284 | Fibrous composite metal hydroxide and process for the production thereof A fibrous composite metal hydroxide containing a small amount of hexagonal-plate-like magnesium hydroxide and being therefore advantageously useful as a reinforcing material for resins and rubbers. The crystal water elimination temperature thereof can be ... | 11/23/1993 |
| 5240692 | Basic magnesium carbonate and process for preparation thereof Disclosed is a novel basic magnesium carbonate represented by the following general formula: nMgCO3.Mg(OH)2.mH.sub.2 O wherein n is a number of from 3 to 5 and m is a number of from 3 to 5, which consists of porous particles composed of an agg... | 08/31/1993 |
| 5171572 | Barium sulfate and cosmetic compositions comprising same Barium sulfate having a specific crystal structure and optical characteristics is disclosed. The crystals have a plate-like structure of which the aspect ratio is 5-100 and the ratio of the square of the circumference of the plate and the area of the orth... | 12/15/1992 |
| 5143965 | Magnesium hydroxide having fine, plate-like crystalline structure and process therefor Novel magnesium hydroxide having a fine, plate-like crystalline structure, a median particle size of up to about 1 micron and a particle size distribution in which about 90% of said magnesium hydroxide particles are less than about 3.5 microns is prepared... | 09/01/1992 |
| 5039509 | Process for the production of magnesium oxide A process for the production of a magnesium oxide having high hydrolysis resistance and high fluidity, which comprises: (A) a step of reacting a water-soluble magnesium salt with an alkaline substance in such an amount that is not more than 0.95 equivalent wei... | 08/13/1991 |
| 4990319 | Process for producing ammonia and sulfur dioxide A process for producing NH3 and SO2 from ammonium sulfate, which comprises (i) reacting ammonium sulfate with a metal oxide or hydroxide at a temperature of not more than 200° C. to form NH3, water and a metal sulfate and... | 02/05/1991 |
| 4927611 | Lightweight magnesia clinker and process for the preparation of the same A lightweight magnesia clinker containing magnesium oxide in an amount of more than 85 wt. % and having an apparent porosity of more than 40 vol. % and a bulk specific gravity of less than 2.0 g/cm3 is disclosed. In the lightweight magnesia cli... | 05/22/1990 |
| 4781903 | Process for removing sulfur oxides from a gas by means of an absorption mass regenerable by reaction with elemental sulfur The invention relates to a process for removing sulfur oxides, particularly sulfur dioxide, contained in gases such as industrial fumes, characterized in that the gas is contacted with a solid absorbent containing magnesium oxide, in such conditions that ... | 11/01/1988 |
| 4725417 | Process for removing sulfur oxides from a gas by means of an absorption mass regenerable by reaction with hydrogen sulfide The invention concerns a process for removing sulfur oxides and particularly sulfur dioxide contained in such gases as industrial fumes, wherein said gas is contacted with a solid absorbent containing magnesium oxide and at least one group VIII noble meta... | 02/16/1988 |
| 4724132 | Continuous process for the manufacture of metal salt solutions from water-insoluble metal compounds and mineral acids A continuous process for the manufacture of a metal salt solution is described which provides more economical products with higher quality than current processes. The process is safer, both to operating personnel and to the environment, than currently use... | 02/09/1988 |
| 4698379 | Magnesium hydroxide, process for its production and resin composition containing it Magnesium hydroxide of a substantially spherical particle form having an average particle size of from 5 to 500 μm and a specific surface area of from 25 to 1 m2 /g.... | 10/06/1987 |
| 4695445 | Magnesium hydroxide and process for its production Magnesium hydroxide of a fine plate-like particle form having an average particle size (d) of from 0.2 to 0.8 μm as measured by a light transmission type liquid phase sedimentation method, wherein the proportion of particles having a particle size of d+0... | 09/22/1987 |
| 4693872 | Process for producing highly pure magnesium hydroxide A process for producing highly pure magnesium hydroxide, which comprises reacting magnesium hydroxide starting material containing impurities, with an aqueous solution containing a water-soluble calcium salt and carbon dioxide to form an aqueous solution ... | 09/15/1987 |
| 4631025 | Calcining process using fluid coke fuel A method of calcining in a fluidized reactor wherein fluid petroleum coke is utilized as the reactor fuel. The method of the present invention utilizes fluid coke as the fuel for a calcining reactor. The fluid coke is introduced into the pneumatic stream ... | 12/23/1986 |
| 4609541 | Method of processing coal gas An improved method for the recovery of elemental sulfur(S) from a coal-gas containing hydrogen sulfide (H2 S) wherein hot lime (CaO) is used and then regenerated according to the following chemistry: These chemical reactions are conducted in-situ wh... | 09/02/1986 |
| 4520002 | Method for preparing elemental sulfur as a diffusion-resistant gas and methods for its use in making lime, sulfur dioxide and sulfuric acid from waste gypsum The present invention relates to the discovery of a method by which elemental sulfur may be delivered to a reaction zone, for gas-solids reaction, in the form of a concentrated, coherent, diffusion-resistant gas thereby permitting gas-solid reactions of g... | 05/28/1985 |
| 4505887 | Fibrous magnesium oxide and process for production thereof A magnesium oxide having a cubic system needle-like crystal structure and a length-to-diameter ratio, determined by an electron microscope at a magnification of 10,000, of at least about 5; and a process for producing a magnesium oxide having a cubic syst... | 03/19/1985 |
| 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 |
| 4370161 | Ore reduction using calcium oxide desulfurization A process and apparatus for producing a low sulfur content hot reducing gas by desulfurizing hot reducing gas by contacting the sulfur-bearing hot reducing gas or carbonaceous material with a particulate calcium oxide desulfurizing agent to thereby produc... | 01/25/1983 |
| 4335083 | Method for leaching magnesium from magnesium hydroxide-containing composition A method for leaching magnesium from a magnesium hydroxide-containing composition, especially a mineral, which comprises contacting said composition with an aqueous solution of an ammonium salt whose corresponding magnesium salt is soluble in said aqueous... | 06/15/1982 |
| 4321242 | Low sulfur content hot reducing gas production using calcium oxide desulfurization with water recycle A process and apparatus for producing a low sulfur content, hot reducing gas by desulfurizing hot reducing gas by contacting the sulfur-bearing hot reducing gas with a bed of a particulate calcium oxide desulfurizing agent to thereby produce a product gas... | 03/23/1982 |
| 4298379 | Production of high purity and high surface area magnesium oxide Disclosed is a process for refining a magnesium and nickel containing ore, comprising the steps of grinding the ore; preparing a slurry of the ground ore in sulfuric acid containing less than ten percent of water; adding water to the acid-ore slurry in an... | 11/03/1981 |
| 4255162 | Integrated process for converting sulfur-containing fuels to low sulfur combustible gas Sulfur-containing fuels are converted to substantially sulfur-free combustible gas in an integrated process involving part combustion in a dense phase fluidized conversion bed of particles comprising alkaline earth metal oxides. An oxygen-containing gas i... | 03/10/1981 |
