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| Number | Title | Issue Date |
| 8167974 | Terephthalic acid purge filtration rate by controlling % water in filter feed slurry The process relates improving the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic acid, while utilizing pressure filtration. ... | 05/01/2012 |
| 8029598 | Method for recovering metal values from refractory sulfide ore A method for recovering metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refractory sulf... | 10/04/2011 |
| 7763096 | Recovery of rhenium The present invention relates to a method for recovering rhenium from an ethylene oxide catalyst containing rhenium and at least silver on a solid support, wherein at least a substantial portion of the rhenium present in the catalyst is extracted by intimate contact... | 07/27/2010 |
| 7641714 | Method for recovering metal values from refractory sulfide ore A method for recovering metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refractory sulf... | 01/05/2010 |
| 7582136 | Recovery of gold from potassium iodide-iodine etching solution A process for the recovery of gold from a potassium iodide-iodine solution is provided. The gold is precipitated from the solution using a weak acid, (e.g. ascorbic acid), a buffer, (e.g. sodium bicarbonate), and a dye. The precipitate is then removed from the solut... | 09/01/2009 |
| 7563304 | Heap bioleaching process A heap bioleaching process wherein carbon, in the form of a carbonate, carbon dioxide or organic carbon, is added to the heap when the temperature in the heap is in the range of 45° C. to 60° C. to increase microbial activity and thereby raise the heap temperature... | 07/21/2009 |
| 7429286 | Method for recovering metal values from concentrates of sulfide minerals A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refra... | 09/30/2008 |
| 7357849 | Method and system for separating solids from liquids A method and system for treating feedwater includes evaporating a portion of the feedwater in a first evaporation chamber so as to separate water vapor from the remaining feedwater. Droplets of the remaining feedwater are dispersed into a stream of hot air produced ... | 04/15/2008 |
| 7351343 | Copper metal recovery system The present invention generally relates to a copper metal recovery system, able to integrate with a waste treatment system of a circuit board manufacture plant, includes a stirring unit, a crystallization unit and a pressure filtering unit. More than 2 parts of weig... | 04/01/2008 |
| 7318904 | Catalytic synthesis of metal crystals using conductive polymers A method of forming metal nanoparticles using a polymer colloid that includes at least one conductive polymer and at least one polyelectrolyte. Metal ions are reduced in water by the conductive polymer to produce the nanoparticles, which may be then incorporated in ... | 01/15/2008 |
| 7214644 | Cross-coupling reactions A method for producing a copper/palladium colloid catalyst useful for Suzuki couplings. ... | 05/08/2007 |
| 7214256 | Solvent extraction process A circuit configuration for a metal solvent extraction plant comprising: A) an extraction section for extracting metal ions from an aqueous leach solution containing the metal ions with an organic solvent solution containing at lea... | 05/08/2007 |
| 7160354 | High temperature heap bioleaching process A heap is constructed with hypogenic copper sulfide bearing ore to include exposed sulfide mineral particles at least 25 weight % of which are hypogenic copper sulfides. The concentration of the exposed sulfide mineral particles is such that the heap includes at lea... | 01/09/2007 |
| 6977050 | Synthesis of lignosulfonic acid-doped polyaniline using transition metal ion catalysts The present invention relates to a method of synthesizing lignosulfonic acid-doped polyaniline by oxidatively polymerizing aniline in the presence of transition metal ions selected from the group consisting of Ag(I), Fe(II), and Fe(III) salts. The present invention ... | 12/20/2005 |
| 6942840 | Method for removal and stabilization of mercury in mercury-containing gas streams The present invention is directed to a process and apparatus for removing and stabilizing mercury from mercury-containing gas streams. A gas stream containing vapor phase elemental and/or speciated mercury is contacted with reagent, such as an oxygen-containing oxid... | 09/13/2005 |
| 6706795 | Methods for the preparation of nanosized material particles The present invention relates to a method for the production of particles of nano-materials being transition metals and alloys; metal oxides; and ceramic compositions having a small nanosize, i.e. about 1-6 nm. The method comprises a synthesis in the solutions of co... | 03/16/2004 |
| 6599414 | Solvent extraction processes for metal recovery An improvement in the solvent extraction process for recovering metal values, i.e. copper, from acidic aqueous solutions containing copper and iron which may also include chloride, and more particularly to an improvement which provides for increased coppe... | 07/29/2003 |
| 6596053 | Processes for the recovery of copper from aqueous solutions containing nitrate ions A process for the recovery of copper from an aqueous phase containing nitrate ions, in which the aqueous phase is contacted with a solution of an oxime extractant in a water-immiscible organic solvent, which comprises using at least one of the following p... | 07/22/2003 |
| 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 |
| 6468327 | Process for processing residual substances containing at least one nonferrous metal and/or compounds thereof The invention relates to a method for processing residues containing at least one non-ferrous metal, preferably chosen from the group comprising zinc, lead, nickel, copper and cadmium and/or compounds thereof. According to this method, the non-ferrous met... | 10/22/2002 |
| 6462095 | Polymer-stabilized metal colloid solutions, method for producing said solutions and use of the same as catalysts for fuel cell Polymer-stabilized metal colloid solutions, process for preparing them and their use as catalysts for fuel cells. Process for preparing metal colloid solutions by reacting a platinum compound and, if desired, one or more compounds of Rh, Ru, Ir or Pd with... | 10/08/2002 |
| 6432167 | Processes for the recovery of copper from aqueous solutions containing nitrate ions A process for the recovery of copper from an aqueous phase containing nitrate ions, in which the aqueous phase is contacted with a solution of an oxime extractant in a water-immiscible organic solvent, which comprises using at least one of the following p... | 08/13/2002 |
| 6416590 | Solder powder and method for preparing the same and solder paste An organic acid salt is deposited on the surface of a solder powder containing Sn and Zn. Alternatively, 0.5 to 10 wt. % of a nonionic surfactant is added to a flux. By a method comprising such a procedure, provided are a lead-free solder powder and solde... | 07/09/2002 |
| 6383254 | Treatment solution and treatment method for reducing copper oxides There are provided a treatment solution for reducing a copper oxide formed on the surface of copper to copper, wherein dimethylamine borane is contained in an amount of 0.3 to 2.0 g/L and the relationship yࣙ0.232x-0.185 holds between the conc... | 05/07/2002 |
| 6290749 | Preparation of ultra-pure silver metal A method for preparing ultra-pure silver from a crude silver mixture containing metallic and/or non-metallic impurities, said method comprising; dissolving the crude silver mixture in nitric acid to form a crude silver nitrate solution; adding a first sel... | 09/18/2001 |
| 6241807 | System for recovery of metals from solutions thereof A system for recovery of metals from solutions containing dissolved metals. The system includes an apparatus and method for placing supercritical carbon dioxide that contains an extractant in contact with the solution and agitating the two resulting phase... | 06/05/2001 |
| 6162278 | Photobiomolecular deposition of metallic particles and films The method of the invention is based on the unique electron-carrying function of a photocatalytic unit such as the photosynthesis system I (PSI) reaction center of the protein-chlorophyll complex isolated from chloroplasts. The method employs a photo-biom... | 12/19/2000 |
| 6106589 | Method for treating noble metal complex ions An agent for treating metal ions in an aqueous solution, which comprises an anthrahydroquinone compound and a metal supported on a carbonaceous carrier.... | 08/22/2000 |
| 5925166 | Process for obtaining iron or iron-based powders by organic liquid phase precipitation The present invention relates to a process for obtaining an iron powder, which may incorporate nickel and/or cobalt, by organic liquid phase precipitation. This process comprises a stage of introducing metal precursors into a basic polyol or optionally si... | 07/20/1999 |
| 5769925 | Process for the elution of precious metals absorbed on active carbon A powerful reducing agent such as hydrazine monohydrate is added to the standard eluent solutions such as NsOH-NaCN with or without alcohol. The kinetics of elution of gold or of silver are thus markedly enhanced.... | 06/23/1998 |
| 5759410 | Process for recovering mercapto-s-triazines from silver precipitate There is provided a process for converting a silver-mercapto-s-triazine precipitate to a solid containing silver and a solution containing mercapto-s-triazine by contacting the silver-mercapto-s-triazine precipitate with one or more reducing agents. In pr... | 06/02/1998 |
| 5484470 | Enhancement of gold lixiviation using nitrogen and sulfur heterocyclic aromatic compounds An improved process for dissolving gold metal in ligand and oxidant lixiviation systems, wherein the solubility of gold is enhanced by the addition of heterocyclic aromatic compounds containing nitrogen or sulfur in the ring.... | 01/16/1996 |
| 5474593 | Agent for treating metal ions in an aqueous solution, process for producing the metal ion-treating agent and method for treating metal ions in an aqueous solution An agent for treating metal ions in an aqueous solution, comprising a solid porous carrier and, supported thereon, an organic reagent (hereinafter referred to as a "redox reagent") which is capable of converting metal ions (inclusive of metal complex ions... | 12/12/1995 |
| 5458787 | Extraction of certain metal cations from aqueous solutions Carbonaceous pyropolymers possessing recurring units containing at least carbon and hydrogen atoms on their surface are effective in removing from solution metal cations having a standard reduction potential to their zerovalent state of greater than -0.2 ... | 10/17/1995 |
| 5411573 | Recovery of precious metals from acid solutions by N-containing electroactive polymers The present invention is directed to a process for reducing the oxidation state of a metal by contacting an acidic solution of the metal with an electroactive polymer, and accumulating and recovering the metal. More particularly, the invention is directed... | 05/02/1995 |
| 5389122 | Process for making finely divided, dense packing, spherical shaped silver particles A method for the preparation of finely divided, dense packing, spherical shaped silver particles comprising the sequential steps of: (1) reacting an aqueous mixture of a silver salt with an alkanolamine to form a homogeneous aqueous solution of a dissolved sil... | 02/14/1995 |
| 5368632 | Redox polymer films for metal recovery applications The treatment of solutions of metal ions with redox polymers under conditions to reduce the ions to a lower valence. The resulting solutions of the lower valence ions are separated from the polymers, and the polymers are regenerated for further use in suc... | 11/29/1994 |
| 5358546 | Highly reactive forms of zinc and reagents thereof A novel zerovalent zinc species and an organozinc reagent are disclosed. The zerovalent zinc species is directly produced by reaction of a reducing agent on a zinc salt, preferably Zn(CN)2. The organozinc reagent results from the reaction of th... | 10/25/1994 |
| 5283192 | Biological process for enhanced manganese and silver recovery from refractory manganiferous silver ore Disclosed is an efficient biological process for recovering silver and manganese from refractory manganiferous silver ore. The process utilizes manganese reducing Bacillus sp. Specifically exemplified is a novel microbe designated Bacillus MBX 69, or muta... | 02/01/1994 |
| 5263044 | Remelting method for recognition and recovery of noble metals and rare metals Method for recognition of noble metals otherwise not recognizable in base material clusters includes using an electron beam furnace in which base material clusters are vaporized by means of an electron beam gun, and the vaporized materials are condensed a... | 11/16/1993 |
