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| Number | Title | Issue Date |
| 7837961 | Processes for extracting aluminum and iron from aluminous ores There are provided processes for extracting aluminum ions from aluminous ores. Such processes can be used with various types of aluminous ores such as aluminous ores comprising various types of metals such as Fe, K, Mg, Na, Ca, Mn, Ba, Zn, Li, Sr, V, Ni, Cr, Pb, Cu,... | 11/23/2010 |
| 7338589 | Process for recovery of gallium The present invention relates to a process for the recovery of gallium from Bayer process liquors. Bayer process liquor is obtained from alumina industries and contains 450 g/L Na2O, 80 g/L Al2O3 and 190±20 ppm of gallium. The prese... | 03/04/2008 |
| 7288184 | Process for mitigating acids in a system for separating aromatic hydrocarbons from a hydrocarbon feedstream Disclosed is a process for removing acids in a system in which aromatic hydrocarbons are separated from a mixture with aliphatic hydrocarbons. The aromatic hydrocarbons are extracted from the mixture using an extracting solvent. The aromatic hydrocarbons are strippe... | 10/30/2007 |
| 7285256 | Precious metal recovery using thiocyanate lixiviant Precious metal-containing mineral material is subjected to an acidic thiocyanate leach to dissolve the precious metal as a precious metal-thiocyanate complex. A feed of the thiocyanate leach solution may include a large molar ratio of ferric iron to thiocyanate. Pre... | 10/23/2007 |
| 7238339 | Bifunctional chelating compounds containing hydroxamic acid residues New types of hydroxamic acid-based bifunctional chelators are provided. These chelators are designed to chelate metal ions that can be detected either by their paramagnetic or radioactive properties. Conjugation with peptides or protein can be achieved by the presen... | 07/03/2007 |
| 7166143 | Method for producing indium powder The invention relates to non-ferrous metallurgy and may be used for zinc and indium containing materials processing resulting in fine indium powder production by converting indium into a salt compound and subsequent treatment of the latter with a water solution in t... | 01/23/2007 |
| 7122080 | Integrated process for simultaneous beneficiation, leaching, and dewatering of kaolin clay suspension The present invention provides an improved method of beneficiating and dewatering kaolin clays. The product of the improved process is a brightened, dewatered kaolin, suitable for use in pigments and paper coating compositions. The improved beneficiation process pro... | 10/17/2006 |
| 7041268 | Process for recovery of sulphate of potash The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the ... | 05/09/2006 |
| 6951960 | Method for removing impurities from solvent extraction solutions A method for regenerating an amine extractant used for recovery of metals involves contacting a liquid organic phase containing an amine complexed with one or more metals with an aqueous solution substantially free of chloride ions to strip the one or more metals fr... | 10/04/2005 |
| 6911116 | Cationically modified white pigments, their production and use Cationically modified white pigments (W) in particulate form, essentially consisting of a particulate inorganic white pigment (M) of a particle size in the range of 0,1 to 40 μm and an applied water soluble, cationic, crosslinked polymer (PA) containing ... | 06/28/2005 |
| 6846470 | Methods for producing indium-containing aqueous solutions containing reduced amounts of metal impurities A method for producing an indium-containing aqueous solution having a reduced amount of metal impurities is provided. A method for producing an indium-containing aqueous solution having a reduced amount of metal impurities which comprises bringing an aqueous solutio... | 01/25/2005 |
| 6838004 | Nanopore reactive adsorbents for the high-efficiency removal of waste species A nanoporous reactive adsorbent incorporates a relatively small number of relatively larger reactant, e.g., metal, enzyme, etc., particles (10) forming a discontinuous or continuous phase interspersed among and surrounded by a continuous phase of smaller adso... | 01/04/2005 |
| 6673969 | Process for preparation of oximes and resulting products A new oxime mixture used as an extractant for metals, prepared from natural products containing alkylated phenols such as cashew nut shell liquid using mild reaction conditions, is expressed by the formula: ##STR1## The oxime mixture is suitable for extra... | 01/06/2004 |
| 6267936 | Method for effecting solvent extraction of metal ions using hydrocarbon soluble aminomethylene phosphonic acid compounds Solvent extraction of one or more metal ions from an aqueous solution in the presence of hydrocarbon-soluble aminomethylenephosphonic acid derivatives.... | 07/31/2001 |
| 6241893 | Water filtration media, apparatus and processes An amorphous potassium aluminosilicate filtration media which may be mixed with activated carbon filters water to remove oxygen, chlorines, hardness, alkalinity, ammonia, hydrogen, hydrogen sulfide, sodium sulfite and other contaminants. The particular so... | 06/05/2001 |
| 6217622 | Method and apparatus for precipitating and classifying solids in high concentrations A method of forming and classifying a precipitate containing large, coarse and fine particles from a super-saturated precipitating mother slurry, e.g. sodium aluminate from the Bayer process. The method comprises separating the precipitating mother slurry... | 04/17/2001 |
| 6048470 | Alumina sol, alumina hydrate powder and processes for their production A process for producing an alumina sol, which comprises stirring a dispersion of an alumina hydrate having a solid content of from 1 to 40 wt % at a pH of from 7 to 12 with an effective consumptive power of at least 0.5 kW/m3 for aggregation tr... | 04/11/2000 |
| 5917069 | Adsorbent for treatment of oils and/or fats An adsorbent is described based on an inorganic support material with exchangeable mono- and divalent cations, characterized by the fact that the specific surface of the support material is >100 m2 /g, its cation exchange capacity is>30 mg-equi... | 06/29/1999 |
| 5840113 | Treated clay product, methods of making and using and products therefrom An improved finely divided rubber-reinforcing clay mineral composition can be produced by employing a hydrous kaolin clay surface treated with a functional silane, a methylene donor compound such as hexamethylenetetramine, and a multifunctional methylene ... | 11/24/1998 |
| 5758255 | Opposite phase entrainment reduction in solvent extraction/electrowinning circuits by addition of water soluble cationic polymers A method of reducing the entrainment of aqueous mineral acid solutions in organic extractants used in the solvent extraction of metals from the aqueous fluid is disclosed. The method comprises adding an effective, entrainment prevention amount of a water ... | 05/26/1998 |
| 5750032 | Removal of lithium from polymer cements Process for removing an alkali metal compound from an acid solution also containing nickel and aluminum compounds, which requires contacting the acid solution first with an ion exchange resin functional to remove the nickel and aluminum compounds from the... | 05/12/1998 |
| 5682593 | Extraction of acids and metal salts from aqueous solutions with diethyl dodecylphosphonate Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.... | 10/28/1997 |
| 5678242 | Membrane extraction with thermodynamically unstable diphosphonic acid derivatives Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and vinylidene-1,1-diphosphonic acid, are capable of complexing with m... | 10/14/1997 |
| 5443732 | Boron isotope separation using continuous ion exchange chromatography This invention relates to a process of and apparatus for the continuous and selective separation of boron-10 (B10) isotope having high neutron capture cross-section from boron-11 (B10) isotope from a mixture of boron isotopes in a bo... | 08/22/1995 |
| 5429887 | Process for treating AB5 nickel-metal hydride battery scrap A process for treating an AB5 Ni--MH battery to recover purified positive and negative electrode components of the battery is disclosed. An AB5 Ni--MH battery is placed in a mineral acid leach solution to cause the positive and negat... | 07/04/1995 |
| 5424050 | Process for extracting gallium from bayer liquors using an impregnated absorbent resin The invention also relates to a method of recovering the gallium contained in an aqueous solution of strongly alkaline sodium aluminate by chemical exchange between a stationary phase consisting of a microporous adsorbent resin impregnated with 7-(alkyl o... | 06/13/1995 |
| 5344567 | Recovery of indium by solvent extraction using trialkylphosphine oxides This invention relates to a process for the recovery of indium from aqueous acid solutions. More particularly, it concerns the use of a combination of a dialkyl phosphoric acid and a mixture of trialkyl phosphine oxides to extract indium from acidic sulph... | 09/06/1994 |
| 5332531 | Extracting metal ions with diphosphonic acid, or derivative thereof Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and vinylidene-1,1-diphosphonic acid, are capable of complexing with m... | 07/26/1994 |
| 5316683 | Metal extraction by ion exchange Process for extracting Ge, Ga, In, As, Sb, Bi, Pt, Pd, Ni, and/or Co from an acid aqueous solution, wherein use is made of a resin with 8-hydroxyquinoline groups, resulting from the reaction of an aminated resin with an aldehyde and 8-hydroxyquinoline, ch... | 05/31/1994 |
| 5308595 | Process for the extraction of gallium Gallium is efficiently extracted from strongly basic solutions containing aluminates by extractants having the tris- and/or tetrakis(2-hydroxybenzyl)-1,2-diaminoethane chemical moiety. The diaminoethane derivative may be used together with a hydrocarbyl ... | 05/03/1994 |
| 5296204 | Thallium extraction process The invention relates to a process for extracting thallium present especially in aqueous wastes of industrial origin. The process, which makes it possible to extract and recover thallium from a solution which contains it in the form of a salt of a strong inorg... | 03/22/1994 |
| 5277883 | Recovery of metal values from aqueous solutions A process is described for recovering metal values, e.g., gallium, contained in an aqueous solution by extraction comprising the steps of contacting the aqueous solution with a water immiscible organic phase comprising a water-insoluble substituted 8-hydr... | 01/11/1994 |
| 5260039 | Process for the two-phase extraction of metal ions from phases containing solid metal oxides, agents and the use thereof A process is disclosed for the two-phase extraction of metal ions from phases containing solid metal oxides, which is characterized in that the solid metal oxides are brought into contact with a hydroxamic acid, known per se, dissolved in a hydrophobic or... | 11/09/1993 |
| 5221525 | Solvent extraction of gallium from acidic solutions containing phosphorus A process for extracting gallium from an aqueous gallium-bearing acidic solution comprises: a) providing a quantity of phosphorus within the aqueous gallium-bearing solution, the phosphorus being provided in an aqueous soluble form and being substantially... | 06/22/1993 |
| 5204074 | Recovery of gallium values from basic aqueous solutions thereof Gallium values are recovered from basic aqueous solutions thereof, e.g., Bayer liquors, by (i) contacting such basic aqueous solution (A) with a medium (I) containing a gallium extractant, whereby the gallium values are transferred to the medium (I), (ii)... | 04/20/1993 |
| 5190735 | Recovery of germanium-68 from irradiated targets A process for selective separation of germanium-68 from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a first ion-containing solution, contacting the first ion-contai... | 03/02/1993 |
| 5174917 | Compositions containing n-ethyl hydroxamic acid chelants N-ethyl hydroxamic acids, preferably containing at least 10 carbon atoms, useful as metal chelants for use in organic solvent extractant solutions such as kerosene to extract metals from aqueous solutions by forming complexes of the extracted metal with t... | 12/29/1992 |
| 5167938 | Process for strontium-82 separation A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets comprises dissolving the molybdenum target in a hydrogen peroxide solution to form a first solution containing ions selected from a group consist... | 12/01/1992 |
| 5122241 | Process for the hydrometallurgical treatment of a solution of materials containing gallium A process of hydrometallurgical treatment of a solution of materials containing gallium and at least one metalloid from Group V of the periodic table of the elements which comprises adding hydrochloric acid and an alkali metal chloride or an alkaline eart... | 06/16/1992 |
| 5102512 | Process for extracting and purifying gallium from bayer liquors A process for extracting and purifying the gallium contained in an industrial solution of sodium aluminate by fixing the gallium on a stationary phase constituted by porous polystyrene adsorbent resin which is impregnated with an extracting agent, optiona... | 04/07/1992 |
