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| Number | Title | Issue Date |
| 7708962 | Process for the separation and purification of hafnium and zirconium A process for the separation and purification of hafnium and zirconium. ... | 05/04/2010 |
| 7485268 | Production of titania A sulfate process for producing titania from a titaniferous material is disclosed. The process includes leaching the titaniferous material and producing a leach liquor, separating titanyl sulfate from leach liquor, hydrolysis of the extracted titanyl sulfate, and th... | 02/03/2009 |
| 7429364 | Production of titania A sulfate process for producing titania from a titaniferous material is disclosed. The process includes leaching the titaniferous material and producing a leach liquor, precipitating iron sulfate from the leach liquor, solvent extraction of titanyl sulfate from leac... | 09/30/2008 |
| 7341658 | Recovery of heavy minerals from a tar sand A process for recovering heavy minerals (e.g., titanium minerals such as TiO2) from a feedstock comprising tar sands or a tar sands-derived solids fraction. The feedstock comprises bitumen and heavy minerals. The process comprises the steps of: (i) contac... | 03/11/2008 |
| 7318897 | Method of removing spectator ions from aqueous suspension of solid particles The present invention provides a method of removing spectator ions and contaminants from aqueous suspensions of solid particles. In accordance with the method of the invention, the solid particles are transported across a phase boundary into a non-polar organic solv... | 01/15/2008 |
| 7318899 | Method of separating isotopes A process in which isotopes of the same element belonging to the alkaline earth metals, transition elements and heavy metals having an atomic mass of less than 209, in particular lanthanide metals, are separated in an aqueous medium by treating an aqueous medium. | 01/15/2008 |
| 7282187 | Recovery of metal values A process for selectively extracting metal values, including, uranium, thorium, scandium and zirconium, from starting materials which include the metal values. The process is particularly well suited to extracting metal and recovering metal values from tantalum/niob... | 10/16/2007 |
| 7244403 | Purification of Lutetium 177 Undesirable metal cation contaminants, including hafnium, can be reduced from a solution containing Lutetium-177 on a bed of an anion exchange resin. The thus purified solution can be stored and transported in a polypropylene vial, to prevent the possibility of hafn... | 07/17/2007 |
| 7182930 | Methods of fabricating barium titanate powders A method of fabricating barium titanate powders uses titanium tetrachloride and barium hydroxide as reactants in a reaction solution. The pH value of the reaction solution is adjusted to strongly alkaline range by adding potassium hydroxide. Nitrogen is charged into... | 02/27/2007 |
| 7025899 | Concentrated solutions of oxime metal extractants and method of formulating extractant compositions therefrom The preparation of concentrated solutions of oxime metal extractants, such as aldoximes and ketoximes, or mixtures of aldoxime and ketoxime, and the use thereof in formulating or preparing extraction reagent compositions for use in an extractant organic phase in a p... | 04/11/2006 |
| 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 |
| 6780384 | Method and system for recovering zirconium values from a hard rock ore containing uranium A method of recovering zirconium values from an ore containing zircon, baddeleyite, and uranium is disclosed. The method includes fusing the ore with soda ash and contacting the resulting fused ore with sulfuric acid, which generates an acid leach liquor that contai... | 08/24/2004 |
| 6737030 | Method for separating hafnium from zirconium A method is provided to optimize separation of zirconium from hafnium by extraction of a feed mix including (Zr+Hf)OCl2 with a thiocyanate-containing organic phase. The method includes maintaining the TA/MO2 ratio in a range from greater than a... | 05/18/2004 |
| 6709641 | Method for extracting anions The invention relates to a method of extracting anions based on metals of groups IV B to VIII of the periodic table from aqueous solutions thereof, wherein compounds of general formula are used as extractants, in which a... | 03/23/2004 |
| 6500396 | Separation of titanium halides from aqueous solutions A method for the production of titanium metal from titanium-bearing ore. The method comprises leaching said ore or a concentrate thereof with an aqueous solution of a hydrogen halide; separating solids from the leach solution, to provide a leachate soluti... | 12/31/2002 |
| 6375923 | Processing titaniferous ore to titanium dioxide pigment A hydrometallurgical process is provided for producing pigment grade TiO2 from titaniferous mineral ores, and in particular from ilmenite ore. The ore is leached with a hydrochloric acid, preferably a recycled solution at high hydrochloric acid... | 04/23/2002 |
| 6337061 | Method for reclaiming metal sulfate-containing waste sulfuric acid For the purpose of efficiently and easily regenerating a sulfuric acid solution having a high concentration and a low impurity content from a metal sulfate-containing waste sulfuric acid solution and waste liquor formed during acid cleaning which are disc... | 01/08/2002 |
| 6296816 | Process for treating an aqueous solution of titanyle sulfate The invention concerns a treatment process with a starting aqueous phase (SAP) containing titanium and sulfuric acid produced by the attack of sulfuric acid on titaniferous ores of the type in which the following steps are used: an extraction step in whic... | 10/02/2001 |
| 5881358 | Composition for extracting transition metal and method for extracting transition metal using the same A composition for extracting a transition metal which comprises as an active ingredient a cyclic phenol sulfide represented by the following formula (1): ##STR1## wherein X represents a hydrogen atom, a hydrocarbon group, an acyl group, a carbox... | 03/09/1999 |
| 5787332 | Process for recovering tantalum and/or niobium compounds from composites containing a variety of metal compounds A process for treating composite materials comprising metals and having significant radioactivity for separation into concentrated individual products is provided. The process of the invention recovers valuable metals and semi-metal elements including rar... | 07/28/1998 |
| 5762890 | Zirconium and hafnium separation in chloride solutions using continuous ion exchange chromatography A method and system for improved ion exchange chromatographic elemental separations of zirconium and hafnium elements and also, if desired, separations of the isotopes thereof from crude zirconium minerals by using improved crude aqueous zirconium (also c... | 06/09/1998 |
| 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 |
| 5618502 | Zirconium and hafnium separation in sulfate solutions using continuous ion exchange chromatography A method and system for improved continuous ion exchange chromatographic elemental separations of zirconium and hafnium and also for isotopic separations thereof from crude zirconium minerals by using zirconium (also containing hafnium) sulfate feedstock ... | 04/08/1997 |
| 5356709 | Non-PVC coextruded medical grade port tubing The present invention provides an improved coextruded medical grade port tubing. The medical grade port tubing provides characteristics that are desirable in the medical industry and therefore can be used as a medical port tubing in, for example, renal th... | 10/18/1994 |
| 5332420 | Chemical process of separating metals from an organic complex A method for the recovery of a metal from an organic complex thereof, said method comprising treating the complex with a weakly acid aqueous solution of an alkali metal or alkaline earth metal chloride having a chloride content of at least 4 molar whereby... | 07/26/1994 |
| 5330731 | Process for separation of zirconium-88, rubidium-83 and yttrium-88 A process for selective separation of strontium-82 and strontium-85 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, passing the fi... | 07/19/1994 |
| 5277816 | Process for producing titanium dioxide A process for producing titanium dioxide which discharges no waste is disclosed. In a first step, a sulfuric acid solution containing titanium ion with one or more kinds of metal ions is contacted with a first organic solvent to extract the titanium ion a... | 01/11/1994 |
| 5240646 | Electrochromic materials The invention relates to novel electrochromic materials useful as electrochromic electrodes in eletrochromic cells and to their preparation process. These materials are constituted by at least one transition metal oxyhydroxide chosen from among H2 | 08/31/1993 |
| 5223232 | Process for separating iron and/or zirconium from the actinides and/or lanthanides present in an aqueous acid solution by means of a propane diamide The invention relates to a process for separating iron and/or zirconium from the actinides and/or lanthanides present in an aqueous acid solution by means of a propane diamide. According to the invention, use is made of a pentasubstituted propane diamide ... | 06/29/1993 |
| 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 |
| 5188736 | Process for the separation and recovery of extractant from spent solvent A new chemical separation process was developed in this invention using 2-methoxyethanol or methyl collosolve (MCS) and ethylene glycol (EG) as separation agents, to separate the valuable extractants such as di(2-ethylhexyl) phosphoric acid(D2EHPA), tri n... | 02/23/1993 |
| 5176878 | Zirconium-hafnium separation process A process for separating zirconium values from hafnium values wherein an aqueous solution of ZrCl4 and HfCl4 is contacted with NH4 SCN, feeding the resultant solution into a solvent extraction system containing aqueous HCl... | 01/05/1993 |
| 5174971 | Continuous anion exchange chromatography for the separation of zirconium isotopes The thermal neutron capture cross-section of zirconium may be altered by altering its natural isotope distribution through a steady state chromatographic separation of these isotopes using an anion exchange resin as the stationary phase of the chromatogra... | 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 |
| 5133865 | Process for producing a hafnium extraction scrub solvent A scrub solution is made up for use in starting up a hafnium liquid-liquid extraction system. An aqueous zirconium oxychloride-containing solution is contacted with methyl isobutyl ketone containing less than 1 Molar thiocyanic acid. The aqueous solution ... | 07/28/1992 |
| 5132016 | Solvent prestripping in a Zr/Hf separation liquid-liquid extraction (LLX) circuit A process for producing nuclear grade zirconium and a liquid-liquid separation circuit for separating zirconium from hafnium are provided. The process employs an aqueous feed of ZrOCl2 in the presence of thiocyanate, an organic solvent and acid... | 07/21/1992 |
| 5112493 | Zirconium-hafnium production in a zero liquid discharge process A simple, low cost continuous process for separating and purifying zirconium and hafnium which eliminates liquid waste and facilitates the management of RCRA and LLW wastes is provided. An aqueous zirconium and hafnium--containing feed solution is prepare... | 05/12/1992 |
| 5110566 | Chromatographic separation of zirconium isotopes with reduced waste liquor The isotopes of zirconium can be partially or completely separated by loading an aqueous solution of an ionic compound of zirconium onto a cationic exchange resin with pentavalent phosphorus derived active groups which serves as the stationary phase of a ... | 05/05/1992 |
| 5098678 | Chromatographic separation of zirconium isotopes The isotopes of zirconium can be partially or completely separated by loading an aqueous solution of an ionic compound of zirconium onto a cationic exchange resin which serves as the stationary phase of a chromatograph, eluting the compound with an aqueou... | 03/24/1992 |
