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| Number | Title | Issue Date |
| 7418835 | Low loss chalcogenide glass and process for making same using arsenic monochalcogenide This invention pertains to a chalcogenide glass of low optical loss that can be on the order of 30 dB/km or lower, and to a process for preparing the chalcogenide glass. The process includes the steps of optionally preparing arsenic monochalcogenide precursor or the... | 09/02/2008 |
| 7232554 | Process for recovering arsenic from acidic aqueous solution A process for the recovery of arsenic trioxide from acid solutions, particularly the aqueous acid effluent produced by a gas-washing process in the pyrometallurgy of copper sulfide ores is provided. Generally, the process comprises concentrating the acid solution in... | 06/19/2007 |
| 6106587 | Process for separating tin as well as, if required, copper from scrap melts, in particular, tinplate melts or metallic melts In a process for separating tin as well as, if required, copper from scrap melts, in particular, tinplate melts or metallic melts as formed in the working up of waste or metal-oxide-containing combustion residues, the carbon content of the melt is adjuste... | 08/22/2000 |
| 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 |
| 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 |
| 5449503 | Process for separating arsenic acid from an aqueous mixture comprising sulfuric and arsenic acids The present invention provides a process for recovering arsenic acid from a starting mixture comprising sulfuric and arsenic acids and water. In step (a), the starting mixture is treated with a sulfur (IV) compound which will reduce the arsenic acid to ar... | 09/12/1995 |
| 5252176 | Crystalline Si2 HSb2 This invention relates to a novel method of, and means for, directing energy through Si2 HSb2 in such a manner that normal energy parameters can be exceeded. The principal object of the invention is to provide the means for more effi... | 10/12/1993 |
| 5198199 | Process for the recovery of antimony-based catalysts used for the fluorination of halgenated hydrocarbons To recover the antimony contained in a solution of use antimony-containing catalyst, emananting from units for the fluorination or chlorofluorination of halogenated hydrocarbons comprising at least two carbon atoms, the solution is concentrated to the lim... | 03/30/1993 |
| 5110353 | Process for the recovery and separation of arsenic from antimony Fume generated by roasting speiss is contacted with an oxygen-containing gas at an elevated temperature for a sufficient time to product arsenic and antimony products which may be separated from each other by means such as condensation. Further, in the ro... | 05/05/1992 |
| 5104445 | Process for recovering metals from refractory ores The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C. Thereafter, an oxidation step can be used to convert ir... | 04/14/1992 |
| 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 |
| 5013355 | Method and apparatus for producing matte and/or metal Method and apparatus for producing matte and/or metal from sulphidic fine-grained ore or ore concentrate. The ore or ore concentrate is smelted in a flame chamber in such a way that at least part of the solid material in the flame chamber melts and flows ... | 05/07/1991 |
| 4940213 | Exhaust processing apparatus An exhaust processing apparatus comprises a cracking furnace for cracking and solidifying exhaust discharged from a reactor for forming crystals on a semiconductor substrate, a first collecting device for collecting relatively large components solidified ... | 07/10/1990 |
| 4891061 | Process for treating speiss Arsenic and antimony are separated from speiss by a roasting operation employing pyrite and coke and the arsenic is separated from the resultant product by a water pressure leaching operation.... | 01/02/1990 |
| 4869893 | Preparation of high purity compounds of sulfur, selenium, and tellurium A method for preparing compounds of sulfur, selenium, and tellurium includes the formation of the compound from the elements in a closed environment which excludes oxygen, and then the purification of the compound by contacting it with carbon or carbon mo... | 09/26/1989 |
| 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 |
| 4808221 | Process for the recovery and separation of arsenic from antimony Fume generated by roasting speiss is contacted with an oxygen-containing gas at an elevated temperature for a sufficient time to produce arsenic and antimony products which may be separated from each other by means such as condensation. Further, in the ro... | 02/28/1989 |
| 4804496 | Rapidly dispersible compositions of antimony pentoxide A process is disclosed for producing a powdered antimony pentoxide composition that rapidly disperses on contact with water. The process comprises spray drying the antimony sol at a temperature of from 180° to 210° F.... | 02/14/1989 |
| 4695447 | Destruction of inorganic hazardous wastes Hazardous waste containing inorganic compounds which contain heavy metals or particular hazardous anionic groups or which are hazardous halides or non-metal oxides or sulfides is contacted with molten aluminum to provide reduction to lower less hazardous ... | 09/22/1987 |
| 4678647 | Process for the recovery of gallium and germanium from coal fly ash A method is disclosed for recovering gallium and/or germanium from fly ash which comprises pelletizing the fly ash, treating the pellets in the presence of an oxidizing gas at a temperature of from about 900° C. to just below the fusion temperature of th... | 07/07/1987 |
| 4666575 | Method of recovering gallium from scrap containing gallium Scrap containing gallium and arsenic is treated with chlorine gas to form a crude gallium and arsenic chloride mixture. Arsenic chloride and impurities having a lower boiling point than that of arsenic chloride are removed from the mixture by vaporization... | 05/19/1987 |
| 4626279 | Method for processing copper smelting materials and the like containing high percentages of arsenic and/or antimony The invention relates to a method for preparing a sulphidic concentrate which is intended for further processing to copper and/or precious metals and which contains high percentages of arsenic and/or antimony, and possibly also bismuth in quantities likel... | 12/02/1986 |
| 4612171 | Method for recovering metal values from materials containing copper and/or precious metals The invention relates to an improvement in a method for recovering metal values from copper-containing and/or precious-metal containing materials which also contain antimony and/or bismuth in such high quantities as to render working-up of the materials w... | 09/16/1986 |
| 4578254 | Process for the refining of sulfidic concentrates which contain arsenic, antimony and bismuth The invention relates to a process for the refining of sulfidic concentrates which contain arsenic, antimony and bismuth, wherein a suspension of the sulfidic concentrate and oxygen or oxygen-enriched air is introduced into the upper part of a reaction zo... | 03/25/1986 |
| 4497780 | Method and apparatus for removing arsenic from an arsenic-containing material Method and apparatus for the removal of arsenic compounds from an arsenic-containing material wherein the material is reacted with an oxygen carrier and a sulfur carrier under temperature conditions sufficiently high to convert the arsenic compounds to su... | 02/05/1985 |
| 4489046 | Method for working-up arsenic-containing waste A method is disclosed for converting an arsenic-containing waste product to a depositable, substantially arsenic-free form by fuming-off the arsenic content thereof. The method comprises melting the waste product under oxidizing conditions in a furnace to... | 12/18/1984 |
| 4447405 | Removal of bromides from arsenic acid solution Bromide ions when used as the redox intermediates in the oxidation of arsenic (III) oxide to arsenic (V) acid can be removed from a solution having a major proportion of arsenic acid by treatment with an oxidant selected from H2 O2, ... | 05/08/1984 |
| 4431614 | Process for the separation of gold and silver from complex sulfide ores and concentrates The present invention relates to a process for the separation of gold and silver from complex sulfide ores and concentrates which, in addition to the primary metals, contain constituents having an adverse effect on the separation of the noble metals, by h... | 02/14/1984 |
| 4374096 | Uranium ore processing Uranium ores, concentrates, calcines or tailings are processed to remove radium and thorium as well as uranium. Selected ores, concentrates or tailings, or if more appropriate, chlorination calcines thereof, are leached by selected aqueous chlorine-contai... | 02/15/1983 |
| 4324586 | Separation of tellurium from tellurium-antimony-containing metal oxide catalysts A tellurium component is separated from a tellurium-antimony-containing metal oxide catalyst by heating the catalyst at a temperature of about 900° C. to about 1,000° C. in a non-reducing atmosphere.... | 04/13/1982 |
| 4220629 | Chlorination of ores with catalyzed metal chlorides The invention comprises a process for the manufacture of metal chlorides by the double-decomposition reaction between a metal chlorinating agent and a metal oxide having greater affinity for chlorine than does the oxide of the metal chloride, and in the p... | 09/02/1980 |
| 4203861 | Inorganic compounds Titanium disulphide particles comprising orthogonally intersecting plates, and having a relatively high surface area, e.g. above 4 m2 /g, in relation to its size, e.g. average largest diameter 2-16 microns, and a method for its preparation by t... | 05/20/1980 |
| 4194904 | Production of purified lead and antimony oxide Purified lead and antimony oxide are produced from antimonial lead alloys by oxidation of the molten alloy to form purified metallic lead and a slag of lead oxides and antimony oxides, separation of the metal and slag, and subsequent partial reduction and... | 03/25/1980 |
| 4185996 | Arsenic and sulfur elimination from cobaltiferous ores A method for removing sulfur and arsenic from cobaltiferous ores and recovering an enriched cobalt product is described. The procedure involves the steps of (a) oxidizing said ore at a temperature of at least about 700° C. to reduce the sulfur content of... | 01/29/1980 |
| 4174372 | Process for treatment of antimony-containing materials A process for treatment of antimony-containing materials in a fluidized bed by way of calcination of the materials at a temperature within the range of from 800° to 1,100° C. obtained by combusting a mixture of a fuel gas and an oxygen-containing gas in... | 11/13/1979 |
| 4118220 | Method for treating waste material Method and apparatus for treating waste material in a counterflow furnace wherein the material is introduced at one end thereof and the processed material is discharged from the other end, while air is simultaneously introduced thereto and the gases of co... | 10/03/1978 |
| 4110247 | Method of preparing colloidal sol of antimony oxide A method of preparing a colloidal aqueous dispersion of antimony pentoxide from substantially water-insoluble metal antimonate is described. The method comprises contacting an aqueous slurry of the metal antimonate with a cation exchange resin whereby the... | 08/29/1978 |
| 4108634 | Process for thermally treating fine-grained solids A process for thermally treating fine-grained solids with high-oxygen gases at temperatures at which the solids can form molten and gaseous reaction products comprises carrying out the thermal treatment at least in part in a cyclone chamber. The solids, h... | 08/22/1978 |
| 4092152 | Volatilization of impurities from smelter reverts A process for substantially reducing the presence of impurities from a sulfur-containing feed material such as dust and hydrometallurgical wastes that result from smelting and refining operations. Pelletized feed materials are heated to 800° to 1150° C ... | 05/30/1978 |
| 4086084 | Refining of metals This invention relates to refining platinum group metal concentrates and the separation therefrom of silver and of the majority of base metals with which they naturally occur. In more detail the process comprises the steps of: (a) contacting a solid parti... | 04/25/1978 |
