Class 423/37 - Sulfiding

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Processes which includes chemically forming a compound having
No. of patents: 55
Last issue date: 06/17/2008

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Number	Title	Issue Date
7387767	Recovery of nickel, cobalt, iron, silica, zinc and copper from laterite ore by sulfuric acid leaching A process for recovering nickel and cobalt values from nickel- and cobalt-containing laterite ores as an enriched mixed nickel and cobalt sulphide intermediate and for producing nickel and cobalt metal from the nickel and cobalt sulphide intermediate. The laterite o...	06/17/2008
7364717	Process for converting nickel to nickel sulfate A preferred embodiment of the present invention provides a process for making nickel sulfate by converting nickel metal into nickel sulfate, which may be converted to nickel hydroxide. Nickel metal is dissolved in sulfuric acid and oxygen containing gas is introduce...	04/29/2008
7037357	Recovery of metals from jarosite-containing materials A method to dissolve at least one metal from jarosite or other iron hydroxyl sulphate containing-material which includes the steps of subjecting the material to alkaline treatment in a brine solution to facilitate jarosite decomposition, and acidification of the bri...	05/02/2006
7033480	Process for recovering platinum group metals from material containing base metals The process of the present invention recovers platinum group metal(s), such as platinum and palladium, from PGM-containing materials containing base metals, such as copper and nickel. The process controls sulfur levels by using solvent extraction 306 to remov...	04/25/2006
6933861	Key-operating device for a hand-held video game apparatus A key-operating device includes a shell confining a chamber therein and connected to a video game apparatus with depressible keys, a lever pivotally mounted in the chamber and having protrusions projecting toward the keys, a wheel surrounding and connected to the sh...	08/23/2005
6440194	Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slag A method of recovering precious metals from metal alloys produced aluminothermically from base metal smelter slag, includes treating the metal alloy with aqueous sulphuric acid solution having a pH of not greater than about 2 to cause dissolution of nicke...	08/27/2002
6350420	Resin-in-pulp method for recovery of nickel and cobalt A process is provided for the direct recovery of nickel and cobalt from a nickeliferous oxide ore leach slurry by ion exchange. A nickeliferous ore is leached with mineral acid to solubilize the metals. The resulting leach slurry is contacted with ion exc...	02/26/2002
6274104	Non-ferrous metal recovery method utilizing a melt sulphation reaction The invention relates to a method for recovering non-ferrous metals, particularly nickel, cobalt, copper, zinc, manganese and magnesium, from materials containing said metals by converting said non-ferrous metals into sulphates by means of melt and melt c...	08/14/2001
6203769	Process for the treatment of fluoboric electrolyte The invention relates to a method for the treatment of fluoboric electrolyte resulting from the processes of electro-extraction of metals such as copper and lead comprising a leaching stage with fluoboric acid, in order to recycle said fluoboric acid to b...	03/20/2001
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
5993514	Process for upgrading copper sulphide residues containing nickel and iron There is disclosed a process for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte undergoes one or more steps of sulphuric acid leaching at atmospheric pre...	11/30/1999
5700438	Process for removal of H2S from gas processing streams A process for removing H2S and mercaptans from gas streams. The process comprises contacting such gas streams with an aqueous solution of copper complex of a water soluble amine to form water insoluble copper sulfide and regenerate free water soluble amin...	12/23/1997
5672328	Method and apparatus for removing silver in the form of silver salts from a liquid By using a method of removing silver in the form of sparingly soluble silver salt, especially silver sulfide, from a solution containing another silver compound, such as a silver thiosulfate complex in a photographic fix or rinsing fluid by precipitation,...	09/30/1997
5498398	Method of treating spent electrolytic solution from electrolytic copper production Disclosed herein is a method for treating a spent copper-refining electrolyte to remove impurities such as copper (Cu), arsenic (As), antimony (Sb), bismuth (Bi), nickel (Ni) and the like by using a hydrogen sulfide gas. The method comprises the steps of:...	03/12/1996
5348713	Recovery of metal values from zinc plant residues A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in the solution by a...	09/20/1994
5320759	Selective recovery of heavy metals using xanthates A process for selectively recovering dissolved heavy metals from a solution is disclosed that involves selectively reacting a xanthate with such dissolved heavy metals. Selective reaction of a xanthate with selected dissolved heavy metals is accomplished ...	06/14/1994
5271909	Method of tellurium separation from copper electrorefining slime A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to 150 psi and at an elevated temperature between about 100° a...	12/21/1993
5178842	Method for precipitating and separating metals According to the method of the invention, at least one or several of the metals nickel, cobalt and copper can be selectively precipitated as sulphide by aid of elemental sulphur from aqueous solutions containing other metals such as zinc. The temperature ...	01/12/1993
5162106	Photographic fixer regeneration A process is disclosed for recovering silver sulfide from a spent photographic fixer solution, which contains silver. The process is particularly suited for treating the fixer solution in a manner which enables recycling of the solution giving rise to con...	11/10/1992
5160631	Method for treating chelant solutions to remove metals in solution A process for removing at least a portion of any iron, copper, nickel and chromium ions that are chelated by a alkylenepolyamine polyacetic acid or salt in an aqueous liquid waste. The process comprises the steps of (a) adjusting the pH of the liquid to a...	11/03/1992
5147618	Process for recovery of gold from refractory gold ores using sulfurous acid as the leaching agent A process for recovering gold from refractory gold-bearing ores uses sulfurous acid as the leaching agent to form a gold-sulfite complex. The ore is ground, slurried blended with a chelating agent and then subjected to a simultaneous dissolved SO2	09/15/1992
5147617	Process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching A process for recovering gold from gold-bearing ores includes the steps of forming a slurry of ground ore and treating the ore with an oxidizing and complexing agent such as hydrogen sulfide or a sulfide salt. A chelating agent, SO2, air, and a...	09/15/1992
4904459	Process for working up dusts which are produced in the electrothermal production of phosphorus A process is provided for working up dusts which have been precipitated electrostatically from the gas mixture composed essentially of carbon monoxide and phosphorus vapor produced in the electrothermal production of yellow phosphorus, which process compr...	02/27/1990
4726939	Process for the removal of mercury from precious metal-cyanide liquors This invention is a process for removing mercury from the desorption or cyanide liquor of a precious metal recovery, cyanide leach system. A sulfide ion-producing compound and a flocculating agent are added to the desorption liquor to form and flocculate ...	02/23/1988
4654079	Process for improving the extraction yield of silver and gold in refractory ores A process for the extraction of silver and gold from refractory ore is disclosed. The process includes first grinding the refractory ore. This ground refractory ore is subsequently treated with an alkali solution of a stoichiometric excess amount of sulph...	03/31/1987
4640710	Process for recovering silver from sulfate solutions The invention relates to a process for recovering silver in sulfuric solutions. Its characterizing feature is that the silver solution is contacted with a quantity of zinc sulfide which is at least equal to the stoichiometric quantity and the surface area...	02/03/1987
4620964	Process for the treatment of complex manganese ores, such as marine nodules A process for the treatment of a complex manganese ore, wherein it comprises the following stages: (a) crushing the ore, (b) subdividing the crushed ore into a first part and a second part, (c) preparing the first pulp from the first part of the crushed ore, (d) re...	11/04/1986
4587110	Process of recovering copper and of optionally recovering silver and gold by a leaching of oxide- and sulfide-containing materials with water-soluble cyanides A process is described by which copper and optionally silver and gold are recovered from sulfide and oxide ores, concentrates or slag, which contain the metals. The particulate materials are treated with an aqueous solution of an alkali cyanide or alkalin...	05/06/1986
4579589	Process for the recovery of precious metals from a roaster calcine leach residue A process for separating precious metals from a roaster calcine leach residue from a process wherein copper or zinc sulfides are roasted to produce a copper or zinc calcine; the calcine is leached with an aqueous sulfuric acid leaching solution to produce...	04/01/1986
4572822	Method of recovering metals from industrial by-products There is disclosed a novel method of recovering valuable metals from an industrial by-product containing copper and arsenic and at least one metal selected from among lead, zinc, iron, silver and cadmium, said method comprising leaching the by-product wit...	02/25/1986
4511540	Exploitation of copper, nickel and cobalt by treating manganiferous matrix oxidized ores Process for treating oxidized ores with a manganiferous matrix to recover the small quantities of copper, nickel and cobalt, which consists of attacking the aforementioned ore by means of an aqueous solution of H2 SO4 with the simult...	04/16/1985
4414115	Removal of copper and zinc species from Bayer process liquor by filtration A Bayer process solution is filtered through a bed of particles of a granular substance containing Fe2 O3 to remove copper and zinc species from the solution. The particles preferably have an Fe2 O3 content of a...	11/08/1983
4405569	Hydrometallurgical process for extracting metal values from complex ores containing arsenic and sulfur This invention relates to environmentally sound hydrometallurgical methods and processes for extraction of cobalt, nickel and silver from complex concentrates. The finely ground minerals are converted during an oxidative caustic leach at elevated pressure...	09/20/1983
4401630	Process for cobalt recovery from mixed sulfides The metal content of nickel-cobalt mixed sulfide slurries is recovered by atmospheric oxidation leaching, thereafter removing dissolved copper by metathesis with further mixed sulfide feed, treating the filtrate after liquid-solids separation with ammonia...	08/30/1983
4369164	Recovery of copper from arsenical drosses by ammonium arsenate leach A process for leaching copper and arsenic from copper dross containing copper arsenide and separated from molten lead bullion comprises leaching the dross with an aqueous ammoniacal solution containing arsenate as the predominant anion under oxidizing con...	01/18/1983
4364773	Waste metal conversion process and products A process is provided by which dissolved metals may be recovered from aqueous waste solutions and converted to a particulate material, which may in turn be used as a filler for products such as asphalt. The process involves effecting reaction in the solut...	12/21/1982
4354870	Metals beneficiation process A process for settling sedimentary materials wherein aqueous suspensions thereof are treated with H2 S as a means for separating clays containing metals associated therewith....	10/19/1982
4331469	Process for the recovery of silver values from silver-containing material which also contains iron and arsenic A process for the recovery of silver values from silver-containing material which also contains iron and arsenic includes leaching the material under oxidizing conditions at elevated temperature and pressure in aqueous nitric acid solution to dissolve a s...	05/25/1982
4323541	Selective two stage leaching of nickel from nickel-copper matte A finely-ground nickel-copper matte is leached using an acid at a minimum temperature of approx. 80° C. and under oxidizing conditions in order to produce a nickel sulfate solution and a nickel-cooper sulfide residue, which is separated from the solution...	04/06/1982
4290865	Recovering copper from a copper-bearing source A system and process are provided for recovering copper from a contaminated copper-bearing source such as copper smelter flue dust. The copper-bearing source is leached in an acidic solution to produce a liquor containing dissolved copper and dissolved co...	09/22/1981

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Class 423/37 - Sulfiding