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| Number | Title | Issue Date |
| 7718148 | Pressure leaching system and method A pressure leaching system for use in a leaching operation including: at least one reaction zone for receiving a slurry of material to be leached from a slurry source, the reaction zone being disposed relative to the slurry source such that slurry is resident in the... | 05/18/2010 |
| 7534407 | Recovery of nickel A process for recovering nickel from a solid feed material containing nickel in the form of millerite is disclosed. The process includes treating a slurry of the solid feed material and a process solution so that all or at least part of the nickel in the millerite f... | 05/19/2009 |
| 7438874 | Pressure oxidation leaching in the presence of an acidic solution of halide and sulfate ions from copper and base metal containing ore/concentrate A process for the extraction of a base metal such as Ni, Co or Zn, from suiphide ore or concentrate containing copper and the base metal comprises the step of subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution co... | 10/21/2008 |
| 7416712 | Method for obtaining cobalt and nickel from ores and ore concentrates The invention relates to a method for obtaining metals from a cobalt and/or nickel arsenic sulfide ore or ore concentrate and/or a cobalt and/or nickel sulfide ore or ore concentrate, according to which the cobalt and/or nickel arsenic sulfide ore or ore concentrate... | 08/26/2008 |
| 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 |
| 7404937 | Production of synthetic rutile by continuous leaching A reactor 20 has a plurality of tubular downcomers 32, 34, 36, 38, 40 and risers 42, 44, 46, 48, 50, joined by sections 86, 88 in a continuous serpentine path the tubes dimensioned to provide substantially plug flow conditions for solid a... | 07/29/2008 |
| 7374732 | Leaching process A process for the oxidative leaching of sulphide mineral species, the method characterised by the method steps of: leaching a slurry containing the mineral species in one or more reaction vessels; circulating a stream of leach liquor to a flash cooler; flashing the ... | 05/20/2008 |
| 7341700 | Method for recovery of metals from metal-containing materials using medium temperature pressure leaching The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials using controlled, super-fine grinding and medium temperature pressure leaching. Processes embodying aspects of the present invention may... | 03/11/2008 |
| 7329396 | Process for the recovery of value metals from material containing base metal oxides A process for leaching a value metal from oxidic materials, such as a lateritic nickel ore, comprising the step of leaching the ore with a lixiviant comprising a cationic salt (e.g., magnesium chloride) and hydrochloric acid is disclosed. An oxidant or additional me... | 02/12/2008 |
| 7318914 | Chromium removal from leach liquors produced during high pressure acid leaching of lateritic ores A method is provided for the removal of chromium from leach liquors produced during high pressure leaching of laterite ores in an autoclave, by addition to the autoclave of carbon in a quantity of about 0.5%-1% by weight with reference to the total dry feed. ... | 01/15/2008 |
| 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 |
| 7217400 | Preparation of iron compounds by hydrothermal conversion An apparatus and continuous process for the conversion of one solid iron compound to another solid iron compound in a heterogeneous suspension wherein the suspension is formed by dispersing a solid starting iron compound in a liquid that is continuously fed through ... | 05/15/2007 |
| 7179439 | Method for preparing disodium paraperiodate It is provided that a method for preparing disodium paraperiodate, characterized in that a pH of a reaction mixture which is obtained by reacting sodium iodate, iodic acid or a mixture thereof with sodium hypochlorite using sodium hydroxide is adjusted to the range ... | 02/20/2007 |
| 7141225 | Method for eliminating heavy metals contained in sludge A method for purifying sludge suspected of containing heavy, toxic and/or precious metals in order to extract them, the sludge being suspended in an aqueous solution and together forming a mass to be treated. FeCl3 is mixed with the mass, until an acidic ... | 11/28/2006 |
| 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 |
| 7115242 | Method for the synthesis of ferrates A method of synthesis of alkali metal ferrates and alkaline earth metal ferrates, in which a trivalent iron compound is mixed with potash and optionally persulphate, and the mixture is heated at a temperature in the range of about 250 to about 500° C. for about 1 t... | 10/03/2006 |
| 7101524 | Process for purifying sand A process for removing iron impurities from sand by treatment of an aqueous slurry of the sand with a chelating agent for iron cations. ... | 09/05/2006 |
| 6986358 | Method and composition to decrease iron sulfide deposits in pipe lines The levels of iron sulfide present in a conduit, such as a pipeline, are reduced by contacting the conduit, on an inner surface, with a composition obtained from an aqueous solution containing at least one compound of Formula (I) ... | 01/17/2006 |
| 6974562 | Methods of synthesizing an oxidant and applications thereof Novel devices for synthesizing ferrate and uses thereof are described. One aspect of the invention relates to devices and systems for synthesizing ferrate at a site proximal to the site of use. ... | 12/13/2005 |
| 6969499 | Bacterially assisted heap leach A bacterially assisted heap leach characterized by the steps of: providing an ore heap to oxidize sulphide minerals therein; providing a biological contactor inoculated with ferrous iron oxidizing bacteria; providing at least one leach solution pond to feed solution... | 11/29/2005 |
| 6953120 | Method of recovering metal and/or oxide thereof in a slurry and tailings obtained from said method A method of recovering metal and/or oxide thereof from a slurry is described. The method involves magnetically separating at least a portion of any magnetic impurities from the slurry and then leaching or dissolving at least a portion of any remaining magnetic impur... | 10/11/2005 |
| 6923947 | Method of making ferric chloride with reduced amounts of hydrochloric acid for water treatment The present invention involves a system and method of making ferric chloride with reduced amounts of hydrochloric acid for water treatment. The method comprises preparing a reactant batch comprising ferric oxide and hydrochloric acid at a predetermined molar ratio. ... | 08/02/2005 |
| 6878247 | Metal-based anodes for aluminium electrowinning cells An anode of a cell for the electrowinning of aluminium comprises a nickel-iron alloy substrate having an openly porous nickel metal rich outer portion whose surface is electrochemically active. The outer portion is optionally covered with an external integral nickel... | 04/12/2005 |
| 6863877 | Iron oxides of reduced chloride content A process for removing chloride from chloridic iron oxide comprises mixing said chloridic iron oxide with an acid and subsequently conducting a thermal treatment at from 50 to 1300° C. ... | 03/08/2005 |
| 6818191 | Autoclave control mechanisms for pressure oxidation of molybdenite The process chemistry during the oxidation of molybdenite concentrates in an oxygen pressure leach can be controlled by regulating the amount of ferric iron and excess sulfuric acid recycled as autoclave discharge slurry or filtrate to the autoclave feed. A computer... | 11/16/2004 |
| 6777511 | Process for producing poly (meth) acrylates having reduced metal content An industrially excellent process for producing a poly(meth)acrylate having a reduced metal content which comprises contacting a mixture of a poly(meth)acrylate and an organic solvent with an acidic aqueous solution, such as an aqueous solution obtained by dissolvin... | 08/17/2004 |
| 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 |
| 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 |
| 6666903 | Method for improved recovery of metals Liquor compositions for the extraction of metallic elements from a metal-contaminated starting material such as mineral ores, recyclable wastes, contaminated soils, toxic wastes such as dusts producing through steelmaking processes by effectuating prefera... | 12/23/2003 |
| 6608001 | Catalyst and method of making micrometer sized spherical particles A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method includes impregnating a porous support with a metal or me... | 08/19/2003 |
| 6569224 | Hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate A hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate. The process involves forming a slurry of the sulfidic flotation concentrate in an acid solution, and subjecting the slurried flotation concent... | 05/27/2003 |
| 6554915 | Dissolution of nickel in non-oxidizing aqueous acid solutions Fairly pure metallic nickel may be efficiently dissolved in non-oxidizing acid. If the nickel includes individual pieces longer than 0.5 mm in any linear dimension, oxidizing agent is preferably added from the beginning of dissolution, while if the nickel... | 04/29/2003 |
| 6524367 | Hydrometallurgical process for the recovery of nickel and cobalt by ammoniacal leaching The present is a hydrometallurgical procedure for nickel and cobalt recovery, which involves leaching with ammonia-ammonium carbonate solution of the nickel and cobalt bearing mineral material, using a tubular reactors aid mineral material is previously s... | 02/25/2003 |
| 6508993 | Method for dissolving base metals and nobel metals from ores containing them A method for dissolving base metals and noble metals from ores having base metals and noble metals which comprises adding the ore to a solution of a non-acid oxidizing agent, then adding an aqueous solution of an acid forming halide and then adjusting the... | 01/21/2003 |
| 6504077 | Method for the decontamination of metallic surfaces A method of decontaminating a radioactively contaminated oxide on a surface. The radioactively contaminated oxide is contacted with a diphosphonic acid solution for a time sufficient to dissolve the oxide and subsequently produce a precipitate containing ... | 01/07/2003 |
| 6468483 | Process for treating alumina-bearing ores to recover metal values therefrom A method for processing alumina-bearing ores such as bauxite to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the alumina-bearing ores to a digester containing an acid to provide a mixture of... | 10/22/2002 |
| 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 |
| 6451273 | Method of producing an active mineral liquid from granite A method of extracting active mineral liquid from a rock such as granite is described. This method comprises charging an extraction vessel with finely divided granite at ambient temperature and pressure; introducing an aqueous ammonia solution with agitat... | 09/17/2002 |
| 6447738 | Coproducing alumina, iron oxide, and titanium-dioxide from aluminum ore bodies and feedstocks A process for the extraction of alumina, iron oxide and titanium dioxide from bauxite ore and clays, and other ore bodies and feedstocks. The process starts by sulfuric acid leaching of the feedstocks in pressure autoclaves at about 200° C. and appropria... | 09/10/2002 |
