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"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 7871584 | Consecutive or simultaneous leaching of nickel and cobalt containing ores A process for the recovery of nickel and cobalt from nickel and cobalt containing ores, including the steps of first leaching a laterite ore and/or a partially oxidized sulfide ore with an acid solution to produce a pregnant leach solution containing at least dissol... | 01/18/2011 |
| 7416711 | Atmospheric pressure leach process for lateritic nickel ore An atmospheric leach process in the recovery of nickel and cobalt from lateritic ores, said processing including the steps of: a) separating the lateritic ore into a low magnesium containing ore fraction, and a high magnesium containing ore fraction by selective min... | 08/26/2008 |
| 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 |
| 6692710 | Method for obtaining magnesium by leaching a laterite material The present invention provides methods for the isolation and production of magnesium products from leaching of laterite material with acid. A magnesium compound is formed by downstream treatment of a leach stream after at least one of nickel or cobalt hav... | 02/17/2004 |
| 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 |
| 6582494 | Recovery of nickel and copper from sulphide concentrates by bioleaching A process for recovering nickel and copper from a concentrate which includes the steps of subjecting the concentrate to a treatment phase to produce a first leach solution which contains predominantly copper and a second leach solution which contains pred... | 06/24/2003 |
| 6461577 | Two-stage bioleaching of sulphidic material containing arsenic A method of leaching sulphidic material that contains metals and arsenic under oxidising conditions and with the aid of microorganisms is characterised by mixing the material with an acid aqueous solution to form a pulp, and in that the material is leache... | 10/08/2002 |
| 6383460 | Process for the recovery of nickel and/or cobalt from a concentrate A process for the recovery of nickel and/or cobalt values from a concentrate containing nickel or cobalt hydroxide comprises the steps of subjecting the concentrate to a leaching stage with an ammonium solution to produce a leach solution containing nicke... | 05/07/2002 |
| 6379637 | Direct atmospheric leaching of highly-serpentinized saprolitic nickel laterite ores with sulphuric acid The present invention provides an atmospheric acid leaching process for leaching nickel and cobalt from highly-serpentinized saprolitic fractions of nickel laterite deposits that are generally too low in nickel to support economical extraction of their ni... | 04/30/2002 |
| 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 |
| 6261527 | Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores A process is provided for leaching nickeliferous laterite ores by hydrometallurgical methods at temperatures below the boiling point of the pulp and at atmospheric pressure from which high overall nickel and cobalt extractions are obtained. The high iron ... | 07/17/2001 |
| 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 |
| 6039790 | Method for recovering nickel hydrometallurgically from two different nickel mattes The invention relates to a method for recovering nickel in one and the same process from two pyrometallurgically produced nickel mattes, one of which contains a remarkable percentage or iron. The leaching of iron-bearing nickel matte is carried out in one... | 03/21/2000 |
| 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 |
| 5628817 | Method for leaching nickel-copper matte employing substantially neutral leaching solutions The invention relates to a process for leaching nickel and copper from nickel-copper matte formed in pyrometallurgical nickel production by means of a multi-stage process. It is essential of the invention that the leaching of nickel takes place in at leas... | 05/13/1997 |
| 5344479 | Upgrading copper sulphide residues containing nickel and arsenic A process is disclosed for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte is leached in aqueous sulphuric acid solution under oxidizing conditions at atm... | 09/06/1994 |
| 4987113 | Preparation of coal liquefaction catalyst When low-quality iron ore is used as a coal liquefaction catalyst, in order to improve its catalytic activity it is subjected to one or a combination of reduction, heat-treatment, or washing with or immersion in water for a long period of time so as to re... | 01/22/1991 |
| 4956157 | Process for separating salts in seawater A process for obtaining available elements from seawater is described, which process includes two separation steps. The first separation step involved adjusting the pH of seawater to a low pH by adding a strong acid having sulphate ion, adding a strongly ... | 09/11/1990 |
| 4954322 | Process for the recovery of metal values contained in a gangue The invention relates to a process for the recovery of metal values contained in a ferric gangue. The process comprises the following stages: (a) dissolution of the metal values from the ferric gangue with sulphuric acid; (b) recovery of the metal value or val... | 09/04/1990 |
| 4906293 | Hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules An improved hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules. The process includes the steps of contacting the ferromanganese nodules in an extraction zone with an aqueous solution containing effective amounts of ch... | 03/06/1990 |
| 4891130 | Process for removing metals from aluminosilicate materials Disclosed is a process for removing accumulated metals, particularly vanadium and nickel, from particulate aluminosilicate materials and aluminosilicate materials that are obtained by the process. The process may advantageously be used to remove accumulat... | 01/02/1990 |
| 4872909 | Process for acid leaching of manganese oxide ores aided by hydrogen peroxide A method of processing manganese ore by adding the ore to an aqueous solution of acid and H2 O2 to form a leach pulp. The leach pulp is agitated for a predetermined time period at predetermined temperatures. The leach pulp is then se... | 10/10/1989 |
| 4861371 | Nickel-containing leachate having low aluminum content A nickel-containing ore is leached with sulfuric acid to dissolve nickel and associated metallic values into the sulfuric acid to form a leachate, the sulfuric acid further containing a source of the monovalent cations sodium, potassium or ammonium to sup... | 08/29/1989 |
| 4655829 | Metal recovery process Metal values are separated from arsenic sulfide ores in a hydrometallurgical oxidation process using a balanced reactant slurry. The molar concentration of As and Sb in the reactant slurry is controlled with respect to the molar concentration of Cu, Pb, a... | 04/07/1987 |
| 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 |
| 4619814 | Process for the recovery of non-ferrous metals from sulphide ores and concentrates This invention relates to the development of a viable metallurgical process capable of treating low grade concentrates, bulk concentrates, dirty concentrates, or ore directly for the recovery of non-ferrous metals such as zinc, lead, copper, and precious ... | 10/28/1986 |
| 4610724 | Recovery of gold from refractory auriferous iron-containing sulphidic material A process for recovering gold from refractory auriferous iron containing sulphidic material which comprises treating an aqueous slurry of the material in a pressure oxidation step at a temperature in the range of from about 135° to about 250° C. under a... | 09/09/1986 |
| 4605439 | Recovery of gold from refractory auriferous iron-containing sulphidic material A process for the recovery of gold from refractory auriferous iron-containing sulphidic material which comprises providing an aqueous feed slurry of fresh feed material and oxidized solids from a subsequent pressure oxidation step. The feed slurry has a p... | 08/12/1986 |
| 4571264 | Recovery of gold from refractory auriferous iron-containing sulphidic ore A process for recovering gold from refractory auriferous iron-containing sulphidic ore which comprises feeding ground ore as an aqueous slurry to an acidic pretreatment step. The ground ore in the acidic pretreatment step is treated with aqueous sulphuric... | 02/18/1986 |
| 4571263 | Recovery of gold from refractory auriferous iron-containing sulphidic concentrates A process for recovering gold from refractory auriferous iron-containing concentrate includes feeding the concentrate as an aqueous slurry to an acidic pretreatment step and treating the concentrate in the acidic pretreatment step with aqueous sulphuric a... | 02/18/1986 |
| 4562048 | Process for the treatment of metal-bearing ores In the hydrometallurgical treatment of metal-bearing ores and particularly the beneficiation of iron-containing titaniferous ores wherein the ore is subjected to leaching with a dilute aqueous acid solution in a digestion zone, there is provided an improv... | 12/31/1985 |
| 4557905 | Leaching and washing a flocculated slurry having a fiber content Particlized mineral material, such as gold ore, silver ore, or coal, is subjected to a leaching process in a manner to maximize treatment effectiveness even when the particlized mineral material contains small fines. The material is slurried with a floccu... | 12/10/1985 |
| 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 |
| 4547348 | Conditioning of laterite pressure leach liquor A method is provided for conditioning nickel laterite pregnant leach liquor in preparation for the recovery of nickel therefrom in which pregnant leach liquor is mixed in a reaction vessel under atmospheric pressure with an amount of roasted high-magnesiu... | 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 |
| 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 |
| 4526615 | Cellular heap leach process and apparatus The present invention is directed to heap leach processes for leaching metal values from ore. The heap is constructed with a plurality of cellular heaps formed by loading ore onto an impermeable pad having a raised berm network thereon to separate the pad... | 07/02/1985 |
| 4474736 | Treatment of aluminous materials A leaching process employing acidic chloride solutions, whereby the iron content of aluminous materials such as lower grade iron-containing bauxite ores is reduced, enabling the obtention of valuable products such as metallurgical grade alumina and refrac... | 10/02/1984 |
| 4472359 | Method of pressure leaching A process of leaching ores, ore concentrates, intermediate metallurgical products and the like, which contain acid-soluble constituents, by a treatment in an acid aqueous solution under pressure in a tubular reactor. The slurry contains suitably 300 to 11... | 09/18/1984 |
| 4464348 | Selective extraction of cobalt from ores Cobalt values are extracted from Co-containing ores or minerals by using an aqueous solution containing a reducing agent (e.g., hydrazine hydrosulfate). The leachant substantially rejects nickel values, thus cobalt is extracted which is substantially free... | 08/07/1984 |
