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| Number | Title | Issue Date |
| 8142743 | Method and apparatus for forming zinc oxide Provided is a method for forming zinc oxide which includes introducing a zinc vapor and a water vapor to a reactor; providing a zinc particulate to the reactor to promote the reaction between the zinc vapor and water vapor, thereby forming zinc oxide and hydrogen. A... | 03/27/2012 |
| 7266173 | Method for distillation of sulfur for the preparing radioactive phosphorous nuclide A method for distillation of sulfur for preparing radioactive phosphorous nuclide includes the steps of: charging powdered sulfur into a target tube designed to have an upper and a bottom neck; degassing the target tube to form a vacuum therein, followed by heating ... | 09/04/2007 |
| 7214254 | Method of removing mercury from mercury contaminated materials A method of reducing mercury levels in a mercury contaminated material using microwave energy. The method comprises the steps of (a) placing the mercury contaminated material in a microwave reactor; (b) providing a stream of gas in the microwave reactor, the stream ... | 05/08/2007 |
| 7186985 | Method and apparatus for fabricating mercuric iodide polycrystalline films for digital radiography A method is provided for fabricating in a thermal evaporation system a polycrystalline film capable of directly detecting radiation. Source material is placed in a container, and the container is evacuated to create vacuum within the container. The source material i... | 03/06/2007 |
| 7037474 | Use of sulfide-containing liquors for removing mercury from flue gases A method and apparatus for reducing and removing mercury in industrial gases, such as a flue gas, produced by the combustion of fossil fuels, such as coal, adds sulfide ions to the flue gas as it passes through a scrubber. Ideally, the source of these sulfide ions m... | 05/02/2006 |
| 6932853 | Mechanical separation of volatile metals at high temperatures A method of operating mechanical separation devices at high temperatures to separate various volatile metals, metal halides and metal oxides to produce high purity materials. ... | 08/23/2005 |
| 6921474 | Chloride melt process for the separation and recovery of zinc Process for the production of ZnCl2 from a Zn bearing primary and/or secondary material comprising the steps of reacting the Zn bearing material with a chlorinating agent such as Cl2 to convert metals into chlorides and vaporising the volatile ... | 07/26/2005 |
| 6918947 | Method for making reduced iron A method for making reduced iron using blast-furnace sludge is provided. The method includes a mixing step of mixing the blast-furnace sludge and an iron-oxide-containing powder to prepare a mixed material, an agglomerating step of agglomerating the mixed material t... | 07/19/2005 |
| 6855859 | Method for controlling elemental mercury emissions Chlorine and sulfide species are separately introduced to a flue gas passing through a scrubber in order to remove the elemental and oxidized mercury from the gas through the precipitation of mercuric sulfide at near 100% efficiency. ... | 02/15/2005 |
| 6682586 | Assemblies and methods for processing zinc-bearing materials A process for separating and recovering a desired metal as metal oxide from raw material is provided. The process includes placing the raw material and a reductant in a container to form a reducing microclimate within the container. A housing having an ox... | 01/27/2004 |
| 6602322 | High temperature metal recovery process An improved method and apparatus for recovering metal values from Electric Arc Furnace dust, particularly zinc and iron values, by mixing EAF dust and carbonaceous fines to form a particulate mixture; heating the mixture at a sufficient temperature and fo... | 08/05/2003 |
| 6572782 | Process for recycling CdTe/Cds thin film solar cell modules Recycling process for CdTe/CdS thin film-solar cell modules in which the modules are mechanically disintegrated into module fragments, the module fragments are exposed to an oxygen-containing atmosphere at a temperature of at least 300° C. causing a pyro... | 06/03/2003 |
| 6399851 | Method and apparatus for removing mercury and organic contaminants from soils, sludges and sediments and other inert materials An apparatus for thermally separating mercury and organic contaminants from inert substrate materials (such as soil, sludges, sediments, drilling muds and cuttings), comprising an essentially air-tight processing chamber having a substrate inlet and a sub... | 06/04/2002 |
| 6214304 | Method of removing mercury from a mercury-containing flue gas A method of removing mercury from a mercury-containing flue gas, especially flue gas from a refuse incinerator, is provided. The mercury-containing flue gas may also contain dust, further heavy metals, and further gaseous noxious gas components. The mercu... | 04/10/2001 |
| 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 |
| 6102982 | Method for recovering zinc oxide from dust A method for recovering zinc oxide comprises the steps of: agglomerating a dust; charging the agglomerate to a molten iron in a melting furnace; collecting a dust generated from the melting furnace; recycling a part of the collected dust and recovering an... | 08/15/2000 |
| 6030433 | Method for extracting metals from metal-containing materials by pyrohydrolysis A method for extracting metals from metal-containing materials, especially waste, by pyrohydrolysis. The metal-containing materials which contain at least one or more of the metals from the group consisting of Zn, Cd, Pb, Hg, Cu, Sn (as Sn(0) and Sn(II)),... | 02/29/2000 |
| 6024931 | Process for removing mercury from mercury contaminated materials Mercury-contaminated substances are fed through a shredder to a loader that loads a rotary tubular kiln, in which a mercury content is evaporated by a primary burner. A temperature of an unlined rotary kiln is monitored from an outside at various points o... | 02/15/2000 |
| 5900042 | Method for the removal of elemental mercury from a gas stream A method is provided to remove elemental mercury from a gas stream by reacting the gas stream with an oxidizing solution to convert the elemental mercury to soluble mercury compounds. Other constituents are also oxidized. The gas stream is then passed thr... | 05/04/1999 |
| 5851490 | Method for utilizing PH control in the recovery of metal and chemical values from industrial waste streams An improved method for the recovery of metal and/or chemical values from an industrial waste stream containing zinc, cadmium, lead and/or iron compounds by heating the waste stream in a reducing atmosphere, treating the resultant fumes in an ammonium chlo... | 12/22/1998 |
| 5728193 | Process for recovering metals from iron oxide bearing masses A process for recovering iron from an iron oxide bearing mass. The process includes forming a bed of lump coke in a vertical shaft furnace, feeding the iron oxide bearing mass and scrap metal onto the bed of lump coke and combusting the coke in the coke b... | 03/17/1998 |
| 5698759 | Treatment of polyvinylchloride A method is described which allows two hazardous waste products, namely PVC and electric arc furnace dust, both of which have negative commercial value, to be combined to produce an iron oxide suitable for steel making and making pure cadmium lead and zin... | 12/16/1997 |
| 5667556 | Method of reprocessing zinc- and iron oxide-containing residual material This invention describes a method of reprocessing zinc- and iron oxide-containing residual material. Zinc- and iron oxide-containing dust and/or sludge is granulated with water, granules and carbonaceous material are fed to a circulating fluidized bed sys... | 09/16/1997 |
| 5612008 | Process for treating solid waste containing volatilizable inorganic contaminants A process for the removal of volatilizable inorganic contaminants from solid waste is provided. The process comprises the steps of: (a) providing solid waste containing volatilizable inorganic contaminants; (b) heating the waste to a temperature sufficien... | 03/18/1997 |
| 5607496 | Removal of mercury from a combustion gas stream and apparatus in a hot combustion gas stream are removed therefrom by oxidizing the elemental mercury, to form a mercury compound, and adsorbing the mercury compounds on adsorbent particles such as activated alumina. Oxidation is catalytically promoted. After adsorbing... | 03/04/1997 |
| 5582812 | Process for gas phase conversion of diethylzinc to zinc oxide powder A vapor of diethylzinc or dimethylzinc is reacted with water vapor to form very small particles of depleted zinc oxide which are entrained in the gas flow. In accordance with one version of the method, a spray nozzle is used to mix liquid diethylzinc with... | 12/10/1996 |
| 5531805 | Smelting ferrous materials Finely divided ferruginous material is intimately mixed with finely divided carbonaceous material and agglomerated and formed into pellets typically of a few cubic centimeters volume to form a feedstock for a smelting operation. The carbonaceous material ... | 07/02/1996 |
| 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 |
| 5364441 | Cotreatment of sewage and steelworks wastes Steelworks dusts or sludge is mixed into sewage preferably in the presence of a flocculating agent to provide a rapid separation of a clear effluent and a sludge which is dewatered and dried to form a solid material adapted to entrap harmful materials in ... | 11/15/1994 |
| 5298227 | Process for separating vaporous heavy metal compounds from a carrier gas and apparatus for carrying out the process A process and apparatus for the separation of vaporous heavy metal compounds from a carrier gas wherein the heavy metal compounds are cooled and desublimed. An apparatus for carrying out this process has a melting furnace with a discharge opening for a ga... | 03/29/1994 |
| 5223145 | Removal of mercury from process streams Mercury is often removed as an impurity from process fluid streams by adsorption in fixed beds using any of several well-known adsorbents having the ability to selectively adsorb mercury. It is also common to reintroduce this sequestered mercury into the ... | 06/29/1993 |
| 5178667 | Dry process for refining zinc sulfide concentrates A pyrometallurgical refining process for obtaining one or both of zinc and lead from a sulfide concentrate, in which an iron-silicate slag or iron-silicate slag containing lime is formed and the sulfide concentrate, incombustible materials, and flux, toge... | 01/12/1993 |
| 5162107 | Method of reprocessing zinc- and lead-containing residues from metallurgical plants by means of a circulating fluidized bed system A zinc- and lead-containing residue from a metallurgical plant is reprocessed by a thermal treatment in a circulating fluidized bed system. A major part of the heat demand is satisfied by a combustion of solid carbonaceous material in the fluidized bed re... | 11/10/1992 |
| 5108496 | Method for the concentration of dusts in a cupola furnace with metal particles A process for the econimic recovery of metallic fractions generated during operation of a cupola furnace comprises the steps of the separating filter dust containing metal fractions from an off-gas stream and recirculating the metal fraction back to the c... | 04/28/1992 |
| 5013532 | Method for recycling electric arc furnace dust This invention relates to the metallurgy of iron and particularly to the separation and recovery of metals from electric arc furnace (EAF) dusts. While the invention discloses a process for the separation and recovery applicable to zinc, lead, cadmium and... | 05/07/1991 |
| 4966763 | Direct vapor/solid synthesis of mercuric iodide using compounds of mercury and iodine A process is disclosed for producing high purity mercuric iodide by passing a gaseous source of a mercuric compound through a particulate bed of a low vapor pressure iodide compound which is maintained at an elevated temperature which is the lower of eith... | 10/30/1990 |
| 4962276 | Process for removing mercury from water or hydrocarbon condensate A method for removing mercury from water or hydrocarbon condensate is provided. The mercury-containing liquid is sprayed into a stripper having a packing therein to facilitate its contact with a stripping gas such as air or natrual gas. The stripped produ... | 10/09/1990 |
| 4889702 | Process for removing metallic constituents from dust obtained during the electrothermal production of yellow phosphorus Metallic constituents, especially heavy metal constituents are removed from dust electrostatically separated from a gas mixture consisting substantially of carbon monoxide and phosphorus in vapor form obtained during the electrothermal production of yello... | 12/26/1989 |
| 4874525 | Purification of fluid streams containing mercury Mercury is selectively removed to very low levels of concentration from fluid streams such as natural gas, cracked gas, hydrogen or naphtha by passage of the stream through an adsorbent bed containing particles of a zeolitic molecular sieve having pore di... | 10/17/1989 |
| 4842832 | Ultra-fine spherical particles of metal oxide and a method for the preparation thereof Ultra-fine spherical particles of a metal oxide having an average particle diameter of 40 nm or smaller can be prepared by a method in which a vaporizable metal compound is vaporized and decomposed under heating to give ultra-fine particles of a metal oxi... | 06/27/1989 |
