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| Number | Title | Issue Date |
| 7879117 | Treatment of coal Process for treating coal to enhance its rank, wherein the temperature of the material is gradually increased in a controlled set of atmospheres, to allow for the reduction of surface and inherent moisture and the controlled reduction of volatile matter while mainta... | 02/01/2011 |
| 7357903 | Method for reducing NOx during combustion of coal in a burner An organically complexed nanocatalyst composition is applied to or mixed with coal prior to or upon introducing the coal into a coal burner in order to catalyze the removal of coal nitrogen from the coal and its conversion into nitrogen gas prior to combustion of th... | 04/15/2008 |
| 7198655 | Method and apparatus for thermally upgrading carbonaceous materials Carbonaceous materials are thermally upgraded in a pressurized steam environment to remove moisture and other byproducts. A variety of water/solid separation devices may be employed in a process vessel to maximize moisture removal from the upgraded charge. Heating m... | 04/03/2007 |
| 7128767 | Method to upgrade low rank coal stocks The ash content of raw coals, lignite, and other carbonaceous materials is reduced by leaching the high-ash material with an aqueous acidic waste product produced by a Fischer-Tropsch reaction. The acidic aqueous waste is mixed with coal and process conditions are d... | 10/31/2006 |
| 7101410 | Method for the microbiological desulfurization of fossil fuels A microbiological method of desulfurization (MDS) of hydrocarbon fuels such as coal, coal tar and petroleum uses an aqueous microbial biocatalytic agent which is not significantly reproducing but is still capable of oxidizing inorganic sulfur compounds and/or of sel... | 09/05/2006 |
| 7090809 | Production of aluminum compounds and silica from ores A method for the production of inorganic aluminum substances and amorphous silica from aluminum oxide containing ores, comprising: (a) leaching of said ores with fluorosilicic acid to obtain aluminum fluosilicate solution; (b) filtering said leached solution from in... | 08/15/2006 |
| 7048779 | Method of removing mercury from exhaust gases of coal fired power plants and associated apparatus A method of removing mercury from a coal fired power plant exhaust gas includes passing the exhaust gas through a bulk particle filter to remove coarse particles, introducing powdered activated carbon into the exhaust gas downstream of the bulk particle filter, intr... | 05/23/2006 |
| 6942707 | Valorization of by-products in the ecological coal transformation A coal transformation system comprises an ecological coal production unit for transforming raw coal into ecological coal. The production unit has an exhaust for carrying in a storage unit combustible, gaseous, waste by-products generated during the transformation of... | 09/13/2005 |
| 6905028 | Method of separation by altering molecular structures Method of separation that uses at least one organic chemical reaction to alter the molecular structure of a substance or substances (102) so that a mechanical method of separation can be used to cause the separation of one or more substances from one or a gro... | 06/14/2005 |
| 6863819 | Water treatment method The invention provides a method treating acid raw water including the step of neutralising the water by adding calcium carbonate to it in a neutralising stage. The neutralised water is then rendered alkaline or more alkaline by adding an alkali thereto selected from... | 03/08/2005 |
| 6632258 | Coal beneficiation by gas agglomeration Coal beneficiation is achieved by suspending coal fines in a colloidal suspension of microscopic gas bubbles in water under atmospheric conditions to form small agglomerates of the fines adhered by the gas bubbles. The agglomerates are separated, recovere... | 10/14/2003 |
| 6599434 | Fine coal recovering process A process and system for recovering fine coal having a size at or below 400 mesh. The process and system includes a series of cyclone separators, a vibrating screen, a centrifuge and a flow path to clean, recover and dewater fine coal having a nominal siz... | 07/29/2003 |
| 6447559 | Treatment of coal Process for treating coal to enhance its rank, wherein the temperature of the material is gradually increased in a controlled set of atmospheres, to allow for the reduction of surface and inherent moisture and the controlled reduction of volatile matter w... | 09/10/2002 |
| 6156083 | Coal reclamation systems A method for recovering coal from a mixture containing fine particles of coal, the mixture including fine coal particles, water, and impurities, the method including feeding the mixture to a first liquid/solid separator that removes relatively large piece... | 12/05/2000 |
| 6156281 | Process for removal of hazardous air pollutants from coal An improved process for removing mercury and other trace elements from coal containing pyrite by forming a slurry of finely divided coal in a liquid solvent capable of forming ions or radicals having a tendency to react with constituents of pyrite or to a... | 12/05/2000 |
| 5817282 | Reduction of nitrogen oxides A method is provided for reducing the nitrogen oxide content of a flue gas produced by the combustion of fuel by introducing a nitrogen oxide removal agent into either the nitrogen oxide contaminated flue gas or the fuel to be combusted. The nitrogen oxid... | 10/06/1998 |
| 5769908 | Method and apparatus for reducing the by-product content of carbonaceous materials The present invention relates to various apparatuses and processes for treating carbonaceous materials to remove by-products therefrom. More particularly, the present invention relates to the treatment of carbonaceous materials by injecting an inert gas i... | 06/23/1998 |
| 5746787 | Process for treating carbonaceous materials The invention described herein relates to a process for treating carbonaceous material wherein the resulting product is resistant to undesired combustion. According to the process, carbonaceous material is treated with a gaseous mixture comprising a major... | 05/05/1998 |
| 5726056 | Fuel product produced by demetalizing a fossil fuel with an enzyme The invention relates to a method of removing metals from a fossil fuel comprising the steps of contacting the fossil fuel with a biocatalyst selected from the group consisting of an enzyme which degrades porphyrin molecules under conditions suitable for ... | 03/10/1998 |
| 5676710 | Coal preparation system A coal preparation plant separates a low specific gravity clean coal fraction from a high specific gravity refuse fraction, and separately processes those fractions. Run of mine coal having particle sizes up to about 4 inches is mixed with a slurry of wat... | 10/14/1997 |
| 5656041 | Method for detoxifying coal-tar deposits In a process for detoxifying a coal-tar deposit, effective amounts of carbon and a calcium oxide containing substance are added at a mixing station to at least a portion of the coal-tar deposit. The reaction mixture thus formed is mixed at a temperature o... | 08/12/1997 |
| 5637122 | Electrostatic pyrite ash and toxic mineral separator The invention relates to electrostatic separation of coal from toxic and pyritic elements and ash compounds. More particularly this invention relates to separation of coal from refuse material by imparting opposite electrostatic charges to coal and refuse... | 06/10/1997 |
| 5597475 | DADMAC/vinyl trialkoxysilane copolymers for dewatering copper and taconite slurries in the mining industry A method for dewatering mineral slurries employing a copolymer of diallyldimethlylammonium halide and a vinyl alkoxysilane, which is preferably a copolymer of diallyldimethylammonium chloride and vinyltrimethoxysilane as a coagulant is disclosed. The meth... | 01/28/1997 |
| 5575824 | Coal preparation device The present invention provides for a fuel coal processing system having a centrifugal type coal pulverizer and an electrostatic type coal purifier and an optional fuel coal size classifier all combined into one integral, cooperatively acting fuel coal pre... | 11/19/1996 |
| 5554201 | Thermal treated coal, and process and apparatus for preparing the same Thermal treated coal which has a water content of not more than 10%, which has pores with an oil adsorbed onto and impregnated into the pore surface, and which is decarboxylated and dehydrated to have a reduced porosity is provided. In its manufacture, po... | 09/10/1996 |
| 5527365 | Irreversible drying of carbonaceous fuels The invention disclosed relates to a method for drying low-quality solid carbonaceous fuels such as lignite and sub-bituminous coal to reduce the moisture content substantially to zero, and to minimize re-adsorption of moisture during storage and transpor... | 06/18/1996 |
| 5403365 | Process for low mercury coal A process for producing low mercury coal during precombustion procedures by releasing mercury through discriminating mild heating that minimizes other burdensome constituents. Said mercury is recovered from the overhead gases by selective removal.... | 04/04/1995 |
| 5350430 | Oil/coal coprocessing in which agglomerated coal forms part of feedstock An improved process is described for agglomerating ground coal in which a bridging oil is used as the agglomerating vehicle. This bridging oil is a mixture of a heavy gas oil obtained from coal/oil coprocessing and a heavy hydrocarbon oil, such as bitumen... | 09/27/1994 |
| 5296006 | 3-acrylamido-3-methylbutanoic acid copolymers as selective coal flocculants 3-acrylamido-3-methylbutanoic acid copolymers of acrylamide or acrylic acid are selective flocculant for coal present in coal refuse slurries.... | 03/22/1994 |
| 5277368 | Coal cleaning process Fine particle coal is beneficiated in specially designed dense medium cyclones to improve particle acceleration and enhance separation efficiency. Raw coal feed is first sized to remove fine coal particles. The coarse fraction is then separated into clean... | 01/11/1994 |
| 5236089 | Method of beneficiating coal The separation density of a dense media comprising a slurry of magnetite and water in a cyclone for beneficiating coal containing refuse is maintained within predetermined limits by: (a) measuring the total solids in an overflow of the cyclone; (b) compar... | 08/17/1993 |
| 5192338 | Coal ash modification and reduction A process for the selective removal or chemical modification of minerals contained in carbonaceous materials, comprising treating with an aqueous solution of a compound selected from ammonium salts, polyhydroxy alcohols, organic acids, organic complexing ... | 03/09/1993 |
| 5190566 | Incorporation of a coprocessing additive into coal/oil agglomerates In the present invention, iron sulfate is added in the form of an aqueous wash solution to coal agglomerates after separation of ash from the agglomerated coal. As the agglomerates remain in a continuous water phase, a good dispersion of the iron sulfate ... | 03/02/1993 |
| 5092909 | Biodesulphurization process utilizing bacteria Method and apparatus for treating sulphur bearing coal comprising pulverizing the coal, mixing it with water, a reagent and free air and pumping the resulting mixture to a classifier to separate the coal from sulphur and clay, all at the mine site. The re... | 03/03/1992 |
| 5085764 | Process for upgrading coal In a process for reducing the sulfur and ash contents of coal, coal is sequentially contacted with fused alkali metal caustic, wash water, and acid. Contacting the coal with the caustic produces water-soluble compounds. Sufficient wash water is used to re... | 02/04/1992 |
| 5071447 | Apparatus and process for steam treating carbonaceous material An apparatus and process of steam treating carbonaceous materials under a controlled temperature and pressure. The feed material is introduced into an autoclave or similar vessel and injected with steam at a high pressure and temperature for a controlled ... | 12/10/1991 |
| 5066310 | Method for recovering light hydrocarbons from coal agglomerates A method and apparatus for removing light hydrocarbons, such as heptane, from coal agglomerates includes an enclosed chamber having a substantially horizontal perforate surface therein. The coal agglomerates are introduced into a water bath within the cha... | 11/19/1991 |
| 5059307 | Process for upgrading coal In a process for reducing the sulfur and ash contents of coal, coal is sequentially contacted with fused alkali metal caustic, water, carbonic acid, and a strong acid. Caustic removed from the coal by the water and the carbonic acid is recovered as anhydr... | 10/22/1991 |
| 5022892 | Fine coal cleaning via the micro-mag process A method of cleaning particulate coal which is fed with a dense medium slurry as an inlet feed to a cyclone separator. The coal particle size distribution is in the range of from about 37 microns to about 600 microns. The dense medium comprises water and ... | 06/11/1991 |
| 4936045 | Demineralization of coal The invention concerns a process for the preparation of demineralized coal, comprising the steps of: (a) forming a slurry of coal particles, preferably at least 50% by weight of which particles have a maximum dimension of at least 0.5 mm, with an aqueous ... | 06/26/1990 |
