Class 423/153 - Desulfurizing

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Processes including the step of removing at least some sulfur
No. of patents: 27
Last issue date: 07/27/2004

Number	Title	Issue Date
6767522	Method for leaching sulfide-containing materials with microorganisms and use of sulphur-containing amino acids in leaching with microorganisms The invention relates to an effective and environmentally safe process for the microbial leaching of sulfidic materials, particularly of sulfide ores such as pyrite, marcasite, chalcopyrite, bornite, or covelline, which process is characterized in that the aqueous l...	07/27/2004
6475462	Process and apparatus for treating particulate matter The present invention provides a process for treating a particulate material, in which particles of the material to be treated interact with non-static particles of a second material, the process comprising the steps of: (i) providing a processing chamber...	11/05/2002
6476287	Sulfite treatment of spent industrial wastes A method of treating metal-contaminated spent foundry sand, or other industrial waste, by combining the sand with a sulfite to produce insoluble metal sulfur oxide complexes that do not leach from the sand. The treated waste may also be processed to reduc...	11/05/2002
6258150	Process for the beneficiation of waste material and the product developed therefrom An iron based product having at least a sufficient total ferrous content by weight to render the product commercially feasible wherein the product is derived by a process comprising the beneficiation of kish slag waste material having a relatively low fer...	07/10/2001
6228263	Treatment of sulphate- and metal-containing water A process for treating sulphate- and metal-containing waste water, includes subjecting, in a reaction stage, the sulphate- and metal-containing waste water to biological sulphate reduction in which sulphates in the waste water are converted to sulphides, ...	05/08/2001
6200377	Process for beneficiation of mixtures of mineral particles An improved process for the beneficiation of mixtures of mineral particles (such as kaolin clays) containing minerals which chelate with hydroxamates. The use of a silicon-containing compound in combination with a hydroxamate results in a more effective s...	03/13/2001
6143259	Treatment of pyrite and arsenophrite containing material with ferric ions and sulfur dioxide/oxygen mixture to improve extraction of valuable metals therefrom A method of treating a mined material which includes a sulphide mineral and iron or a concentrate of the mined material to improve the recovery of a valuable metal from the sulphide mineral is disclosed. The method comprises: (i) oxidising the sulphide mi...	11/07/2000
5972302	Method for the microwave induced oxidation of pyritic ores without the production of sulphur dioxide Pyritic ores are heated with microwave energy in a fluidized bed to a temperature in the range of approximately 573 degrees Kelvin to 823 degrees Kelvin with a controlled amount of oxygen to promote the oxidation of the pyritic ores according to the react...	10/26/1999
5783158	Process for treating sulfide ores containing gold and/or silver and as accompanying metal at least iron The ore which contains gold and/or silver and as accompanying metal at least iron is calcined at temperatures in the range from 500° to 900° C. with the addition of oxygen-containing gas. There is obtained a metal-oxide-containing solids mixture and a S...	07/21/1998
5234669	Recovery of non-ferrous metals from smelter flue dusts and sludges Methods are disclosed for treating smelter flue dust and other smelter by-products so as to recover non-ferrous metals therefrom and convert arsenic and sulfur in the flue dust into non-leachable compounds. The methods allow the flue dust and other smelte...	08/10/1993
5114700	Electrically heated fluidized bed reactor and processes employing same A method of carrying out a chemical reaction in a fluidized bed reactor is provided wherein the reactants include at least one finely sub-divided reactant having a particle size substantially smaller than that of the particles constituting the fluidized b...	05/19/1992
5066470	Cyclic process for the removal of sulfur dioxide and the recovery of sulfur from gases In accordance with the invention, gases containing sulfur dioxide are passed through a solution rich in ferric iron and containing barium chloride or calcium chloride. Sulfur dioxide is oxidized by the ferric ion to sulfur trioxide when then forms sulfuri...	11/19/1991
4889694	Recovery of zinc values from zinc and iron-bearing sulfide materials Iron-containing zinc sulfide concentrate is processed to recover zinc values therefrom. The concentrate is roasted to convert zinc sulfide and iron sulfide to their oxides while adequate sulfide-sulfur is retained to maintain the iron values in the ferrou...	12/26/1989
4836898	Methane conversion reactor The present invention discloses a methane converter comprising a reactor tube and a heating means to raise the reactor tube temperature to the desired reaction temperature wherein the reactor tube is packed with a high temperature stable, glass fibers the...	06/06/1989
4789529	Recovery of zinc from zinc bearing sulphidic ores and concentrates by controlled oxidation roasting A process is described for the controlled oxidation roasting of zinc bearing sulphidic ores and concentrates by adjusting the furnace temperature and residence time together with the oxygen availability to the sulphide retention requirements in the calcin...	12/06/1988
4778520	Process for leaching zinc from partially desulfurized zinc concentrates by sulfuric acid A process comprises leaching zinc oxide either separately or in conjunction with iron oxides from a partially desulfurized zinc bearing sulfide ore of concentrate. The ore is pretreated to eliminate in a controlled manner sulfur-sulfur-sulfide in the ore ...	10/18/1988
4726937	Recovery of nickel chloride and sulfur from waste products Waste containing sulfur and nickel sulfide is heated to volatilize sulfur and reacted with hydrogen chloride to form nickel chloride....	02/23/1988
4659557	Process for producing ferrous sulphate in granule form In a process for making ferrous sulphate in granule form, ferrous sulphate heptahydrate is mixed with fine-grain brown coal or lignite having a low water content, in such an amount that the resulting mixture is pourable....	04/21/1987
4376647	Process for treating sulfide-bearing ores A process for removing sulfur from sulfide-bearing ores by reacting water vapor with the sulfide-bearing ore forming hydrogen sulfide while simultaneously regenerating water vapor by reacting the hydrogen sulfide with lime. Advantageously, the process occ...	03/15/1983
4289529	Process for beneficiating sulfide ores In a process for beneficiating one or more mineral values of sulfide ores by treating the sulfide ore with a metal containing compound under conditions such as to selectively enhance the magnetic susceptibility of the mineral values to the exclusion of th...	09/15/1981
4276081	Process for beneficiating ores In a process for beneficiating one or more mineral values of sulfide ores and/or metal oxide ores selected from the group consisting of bauxite, taconite, apatite, titanium oxides and the metal oxides of Groups IIIB, IVB, VB, VIB, VIIB, VIIIB, IB, IIB and...	06/30/1981
4259106	Process for the roasting and chlorination of finely-divided iron ores and concentrates containing non-ferrous metals Finely-divided iron ores and concentrates which contain non-ferrous metals are roasted and chlorinated in order to vaporize the non-ferrous metals as metal chloride compounds, whereby the finely-divided raw material is oxidized at an elevated temperature ...	03/31/1981
4226617	Method for treating a mineral sulfide This invention relates to method and apparatus for treating a sulfur containing material having at least one principal sulfide either in the form of a sulfide or in a form that is transformable into a sulfide and at least one auxiliary sulfide more volati...	10/07/1980
4214901	Hydrometallurgical refining of nickeliferous sulfides Nickeliferous sulfidic materials containing at least one other metal selected from the group consisting of cobalt, copper and iron are leached with an at least 3 N hydrochloric acid solution to produce a pregnant nickel chloride solution. The pregnant nic...	07/29/1980
4061716	Process for the production of sorbent solids for use in the desulfurization of gases This disclosure describes a process for the preparation of iron-bearing and calcium-bearing sorbent solids for use in the desulfurization of gases. The process involves mechanical procedures for generating porous agglomerated solids that are high in surfa...	12/06/1977
4003740	Recovery of copper from copper sulfide ores containing copper and iron The invention provides a cyclic process for recovering copper from sulfide ores containing copper and iron which comprises reacting the sulfide ore with sulfur dioxide gas at a temperature of at least about 500° C. to form elemental sulfur, removing the ...	01/18/1977
3957484	Fluid bed roasting of metal sulphides at high temperatures An improved method for agglomerative fluid bed roasting of metal sulphide particles. The sulphide particles are fed as an aqueous slurry through the freeboard of the roaster onto the surface of a bed of roasted calcine agglomerate particles fluidized by a...	05/18/1976

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Class 423/153 - Desulfurizing