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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 |
| 7288241 | Black composite oxide particle and method for production thereof A black composite oxide particle includes a composite oxide having Fe, Mg and Al as metal components. The particle contains Fe, Mg and Al in amounts of 30 to 55 mass %, 1 to 10 mass %, and 1 to 10 mass %, respectively, and has an atomic ratio of Fe3+/Fe | 10/30/2007 |
| 7220394 | Process for simultaneous recovery of chromium and iron from chromite ore processing residue The present invention relates to a process for simultaneous recovery of chromium and iron from Chromite Ore Processing Residue (COPR) and more particularly, the present invention relates to an economical and environment-friendly process for recovering chromium as a ... | 05/22/2007 |
| 7118719 | Method for the hydrolytic precipitation of iron The invention relates to a method for the hydrolytic precipitation of iron as jarosite from a sulphate-containing solution in connection with zinc recovery from zinc calcine. The recovey contains neutral leach, ferrite leach, zinc electrolysis and iron precipitation... | 10/10/2006 |
| 7018605 | Sulfidation reaction control method A method of sulfidation removal of zinc using hydrogen sulfide is provided, desirably at a temperature at 60° C. or lower, wherein in a container that is pressurized at 0.1 MPa or less with respect to atmospheric pressure, by making the pH of the solution 1.5 to 4.... | 03/28/2006 |
| 6949232 | Producing cobalt (III) hexammine sulfate from nickel cobalt sulfides There is provided an improvement in a process for producing cobalt (III) hexammine sulphate which process comprises oxidatively pressure leaching nickel cobalt sulphides in an ammoniacal ammonium sulphate solution. The nickel and cobalt sulphides are oxidized to sul... | 09/27/2005 |
| 6923917 | Phosporous removal from animal waste The subject invention is related to a method for removing bio-available phosphorus from animal waste and soil using an industrial byproduct from a metal manufacturing process. The byproduct is used to treat organic waste, such as animal waste and poultry litter, and... | 08/02/2005 |
| 6902745 | Method of manufacturing nano-sized lithium-cobalt oxides by flame spraying pyrolysis A method for producing nano-sized lithium-cobalt oxide is provided by using flame-spray pyrolysis. The method comprises the steps of: spraying minute droplets, which is a solution dissolved lithium salt with cobalt salt at room temperature; atomizing the minute drop... | 06/07/2005 |
| 6680035 | Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores A hydrometallurgical process is provided for leaching nickeliferous laterite ores at temperatures below the boiling point of the pulp and at atmospheric pressure. The high iron fraction of the laterite, referred to as limonite, is first contacted with con... | 01/20/2004 |
| 6447650 | Manufacturing method of CdS photocatalyst for hydrogen production and method for producing hydrogen by use of the same A method for preparing a CdS photocatalyst represented by general formula (I): m(a)/Cd[M(b)]S, comprising the steps of: dissolving Cd-containing and M-containing compounds in water in such an amount that the mol % of M ranges from 0.001 to. 20.00; adding ... | 09/10/2002 |
| 6379636 | Method for leaching nickeliferous laterite ores A process is provided for the leaching of both the "limonite" (Fe approx. ࣙ25% and Mg approx. ࣙ6%) and "saprolite" (Fe approx. ࣘ20% and Mg approx. ࣙ10%) fractions of typical nickel and cobalt bearing laterite ore. The low magnesium fraction of the... | 04/30/2002 |
| 6267800 | Process for producing cobalt metal powder from nickel-cobalt sulphides A process for producing cobalt metal powder from nickel-cobalt sulphides wherein said nickel-cobalt sulphides are leached in an ammoniacal ammonium sulphate solution under an elevated pressure of an oxygen bearing gas, at a temperature of at least 80° C.... | 07/31/2001 |
| 6264904 | Process for recovery of cobalt by selective precipitation of cobalt-calcium double salt There is provided a process for the recovery of cobalt as cobalt (III) hexammine sulphate, comprising adding an effective amount of a calcium sulphate slurry to an ammoniacal ammonium sulphate solution containing cobalt (III) hexammine sulphate to thereby... | 07/24/2001 |
| 6206951 | Method for leaching nickel from nickel matte The invention relates to a method for leaching sulfidic nickel matte and particularly copper rich nickel matte, as well as for leaching said matte together with a metallic copper and/or copper-nickel matte. The leach of nickel matte is carried out as pres... | 03/27/2001 |
| 5824283 | Process for producing nickel hydroxide from elemental nickel This process produces nickel hydroxide from elemental nickel. Introducing elemental nickel into at least a 4N aqueous ammonia solution forms a mixture. Activating the nickel powder of this mixture allows the nickel to react with oxygen in the solution. Th... | 10/20/1998 |
| 5746994 | Method for synthesizing ferrate and ferrate produced thereby A method of producing ferrate is disclosed, in which Fe3+ is oxidized with monoperoxosulfate (HSO5-) to form K2 FeO4 /K2 SO4. The isolation of the potassium ferrate (K2 ... | 05/05/1998 |
| 5468281 | Process for the separation of cobalt from nickel A process is disclosed for separating cobalt in the form of cobalt (III) hexammine sulphate from an aqueous solution containing cobalt (III) hexammine sulphate and nickel (II) hexammine sulphate comprising adding ammonium sulphate to provide an effective ... | 11/21/1995 |
| 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 |
| 5336297 | Process for the treatment of electric arc furnace dust In a process for the treatment of electric arc furnace (EAF) dust, the dust is first subjected to atmospheric leaching with a ferric chloride solution and thereafter subjected to treatment in an autoclave at an elevated temperature and pressure for conver... | 08/09/1994 |
| 5281494 | Nickel hydroxide A novel process for the production of nickel hydroxide wherein particulate nickel is reacted with oxygen in the presence of liquid water at a temperature of at least 180° C. The invention also includes the nickel hydroxide product so produced.... | 01/25/1994 |
| 5248497 | Production of purified iron chloride by a vacuum process in the manufacture of titanium dioxide This invention provides a process for the recovery of purified ferrous chloride resulting as a by-product during the production of titanium dioxide by the chloride process. The process involves a two-step cooling of a filtered solution containing ferrous ... | 09/28/1993 |
| 4992143 | Continuous process for the separation of a partially water soluble component from a slurry A continuous multistage process for separating a partially water soluble organic component from a slurry containing an insoluble solid, a partially water soluble organic component and optionally water. In this process, the slurry is continuously fed to a ... | 02/12/1991 |
| 4853205 | Supercritical fluid metal halide separation process Process of using supercritical fluid to selectively separate, purify and recover metal halides.... | 08/01/1989 |
| 4832925 | Recovery of zinc from zinc-containing sulphidic material A process for the recovery of zinc from zinc-containing sulphidic material which also contains iron and from zinc oxide containing material, at least one of the materials containing lead and/or silver values. The process includes leaching zinc-containing ... | 05/23/1989 |
| 4828809 | Separation of nickel from copper in autoclave Nickel is separated from copper contained in predominantly nickel- and copper-bearing sulphidic matte and alloys by chlorine leaching in an autoclave at over-atmospheric pressure. The leaching is conducted in an acidic solution at a redox potential range ... | 05/09/1989 |
| 4827060 | Removal and recycling of catalysts in chlorinated pricess streams A catalyst, such as FeCl3, useful in the production of chlorinated hydrocarbons such as 1,1-dichloroethane is removed from the effluent of a process reactor and recycled. Hydrochloric acid is removed from the process stream resulting in the cat... | 05/02/1989 |
| 4594102 | Recovery of cobalt and nickel from sulphidic material A process for recovering cobalt and nickel values from cobalt and nickel containing sulphidic material also containing iron includes roasting the sulphidic material to produce a calcine containing water soluble cobalt and nickel sulphate, and leaching the... | 06/10/1986 |
| 4548794 | Method of recovering nickel from laterite ores According to the present invention, processes are provided for recovery of nickel, cobalt and like metal values from laterite ores wherein the ores are separated into high and low magnesium containing fractions, the low magnesium fraction is leached with ... | 10/22/1985 |
| 4547347 | Granulometric control of nickel sulfide precipitate A process wherein nickel in an aqueous stream is recovered as nickel sulfide by precipitation in an autoclave with pressurized hydrogen sulfide in the presence of a large quantity of recycled fine nickel sulfide seed material is improved when operated und... | 10/15/1985 |
| 4545816 | Processes relating to the extraction of metals from laterites and ocean manganese nodules The selective leaching of metal ions from various iron oxide and manganese oxide containing ores employs intermediary solutions. The leaching processes are based upon a redox acid leach step employing stabilized cuprous ions and, in one instance, a combin... | 10/08/1985 |
| 4541868 | Recovery of nickel and cobalt by controlled sulfuric acid leaching According to the present invention, improved dissolution of nickel and cobalt and thus improved recovery of those desired metal values is achieved by modifying the ore recovery processes wherein sulfuric acid leaching at elevated temperatures is used to d... | 09/17/1985 |
| 4541994 | Method of liberating nickel- and cobalt-enriched fines from laterite According to the present invention, Ni- and Co-rich, low Mg fines may be advantageously separated from the coarse fractions of lateritic ores by atmospheric or low pressure leaching. In particular, the process of the present invention comprises contacting... | 09/17/1985 |
| 4457897 | Process for the selective dissolution of cobalt from cobaltite-pyrite concentrates A hydrometallurgical process for the recovery of cobalt from cobaltite-pyrite concentrates containing substantial amounts of cobalt, arsenic, iron and sulphur is disclosed. The hydrometallurgical process comprises pressure leaching of the cobaltite-pyrite... | 07/03/1984 |
| 4415542 | Controlling scale composition during acid pressure leaching of laterite and garnierite ore The scaling of autoclave and leaching-equipment surfaces during the high pressure leaching of nickeliferous oxide and silicate ores is controlled during leaching to favor the formation of scale containing substantial amounts of magnesium sulfate that is m... | 11/15/1983 |
| 4402860 | Process for demetallizing primary products of the oxo synthesis An improved process for de-cobaltizing the primary product of an oxo synthesis is disclosed wherein the primary product is contacted with steam introduced into a vessel to which the primary oxo product is introduced but initially maintained in out of cont... | 09/06/1983 |
| 4399109 | Control of silica scaling during acid leaching of lateritic ore A method is provided for inhibiting the formation of silica scale on flash-pot surfaces during the multi-stage flashing of sulfuric acid pressure-leach slurry obtained following the continuous autoclave leaching of nickel lateritic ore at elevated tempera... | 08/16/1983 |
| 4329169 | Method for producing cobalt metal powder Fine particle size cobalt metal powder is prepared absent tailings by heating an aqueous solution of soluble cobaltic ammine halide to a temperature of at least about 120 degrees centigrade for a sufficient period of time to decompose said cobaltic ammine... | 05/11/1982 |
| 4282190 | Process for the manufacture of iron and aluminum-free zinc chloride solutions A process for the removal of iron and aluminum values from acidic solutions thereof with zinc chloride wherein the solution is subjected to pressure hydrolysis to precipitate the iron and aluminum as the hydroxides or oxide hydrates, and then the precipit... | 08/04/1981 |
| 4222999 | Removal of selenium from sulphate solutions A process for purifying copper sulfate solution by converting contained hexavalent selenium to tetravalent selenium which is amenable to removal from solution by heating and maintaining the solution at a temperature in the range of about 135° to 220° C.... | 09/16/1980 |
| 4208380 | Process for the recovery of cobalt from its impure, aqueous, in particular nickel-bearing, solutions and catalyst therefor Cobalt is recovered as a finely-divided and anhydrous salt from impure, nickel-bearing, aqueous solutions of cobalt, by exposing the aqueous solution to oxidation at an elevated temperature in the presence of ammonia and the respective ammonium salt, the ... | 06/17/1980 |
