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| Number | Title | Issue Date |
| 8057763 | Process for recovering group VIB metals from a catalyst The invention relates to a process for recovering Group VIB metals from a catalyst, in particular a spent bulk catalyst, comprising one or more Group VIB metals and one or more Group VIII metals. Further, the invention relates to a solid Group VIB metal compound obt... | 11/15/2011 |
| 7993614 | Method for recovering tungsten A method for recovering tungsten from a reaction mixture obtained by reacting an organic compound with hydrogen peroxide in the presence of a tungsten catalyst comprising blowing a gas into the reaction mixture to precipitate tungstic acid (WO3.H2 | 08/09/2011 |
| 7670576 | Methods of treatment of chromite ore processing residue Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with t... | 03/02/2010 |
| 7338603 | Process using rare earths to remove oxyanions from aqueous streams Oxyanions of various contaminant elements, such as chromium, antimony, molybdenum, tungsten, vanadium and uranium, are removed from water and other aqueous feeds by treating the feed with (1) a sorbent comprising one or more rare earth compounds, usually mixed or su... | 03/04/2008 |
| 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 |
| 7261820 | Method for decreasing a concentration of metal in aqueous solution A method and system for decreasing the concentration of at least one metal in an aqueous solution. The metal may be molybdenum, tungsten, or both. An aqueous solution is introduced into at least one reaction zone, and at least one source of hydroxide ions is provide... | 08/28/2007 |
| 7255795 | Process for selectively removing molybdenum from liquid mixtures containing it together with vanadium Process for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than (200) mg/l, together with vanadium characterized in that it comprises the following steps: bringing the liquid mixture to a pH of less than (3); adding a solut... | 08/14/2007 |
| 7247282 | Method for the removal of metals from an aqueous solution using lime precipitation The invention relates to a method for the removal of metals from their aqueous solution with lime precipitation, in conditions where a precipitate of metal hydroxide and gypsum is formed, which settles well and is easy to filter. The metals are precipitated from the... | 07/24/2007 |
| 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 |
| 7217366 | Purification of ammonium metallate solutions A process for reducing the content of alkali metal impurities (e.g., potassium) in ammonium metallate solutions is described. The process involves subjecting a feed solution containing ammonium metallate and alkali metal impurities to membrane filtration. The membra... | 05/15/2007 |
| 7169371 | Process for the treatment of molybdenum concentrate A method of treatment or purification of a molybdenum concentrate also containing copper, comprises the step of subjecting the molybdenum concentrate to pressure oxidation in the presence of oxygen and a feed solution containing copper (e.g. CuSO4) and ha... | 01/30/2007 |
| 7160526 | Process for detoxification of CCA-treated wood A chemical process for detoxifying spent CCA (copper, chrome, arsenic)—treated wood, from which CCA and detoxified wood are recovered for recycling comprising the steps of (a) treating CCA-treated wood in the presence of a liquefying reagent such as an organic sol... | 01/09/2007 |
| 7157072 | Cathode composition for lithium batteries and method of preparing the same Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[Li(1-x)/3CrxTi(2/3)yMn2(1-x-y)/3]O2 where 0≦x≦0.3, 0≦y≦0.... | 01/02/2007 |
| 7153698 | Field-deployable cartridge method and test kit for arsenic A method and test for field sample arsenic speciation in aqueous solutions, in particular, arsenic speciation in drinking water, is described. In particular, the method and test uses in series three columns wherein the first column removes interfering cations from w... | 12/26/2006 |
| 7132093 | Mesoporous mixed oxide materials as a new class of SOresistant catalysts for hydrocarbon oxidation The oxide materials are of the class of ternary mesoporous mixed oxide materials including lanthanum, a metal M selected from the group consisting of Cr, Mn, Fe, Co, Ni, Cu and Zn, and zirconium or cerium such a mesoporous La—Co—Zr mixed oxide material designate... | 11/07/2006 |
| 7122168 | Shape anisotropic metal oxide nanoparticles and synthetic method thereof In a metal oxide nanoparticle and a synthetic method thereof, and in particular to maghemite (γ-Fe2O3) nanoparticles usable as a superhigh density magnetic recording substance by having good shape anisotropy and magnetic characteristics, hemat... | 10/17/2006 |
| 6833123 | Method for liquid chromate ion and oxy-metal ions removal and stabilization A method for removing at least one of chromate and other oxy-metal ions from liquid solutions includes contacting the liquid solution with solid barium compounds as adsorbents so that the at least one of chromate and other oxy-metal ions in liquid solution are subje... | 12/21/2004 |
| 6833124 | Recovery process for wastes containing hexavalent chromium A process for recovery of hexavalent chromium from waste streams. The method includes providing a waste stream containing hexavalent chromium, reacting a soluble non-toxic precipitating reagent with the hexavalent chromium to form an insoluble precipitating reagent-... | 12/21/2004 |
| 6800260 | Processes for treating iron-containing waste streams Processes for treating iron containing waste streams are provided. According to these processes, metal-containing compounds, particularly iron oxides are produced. These methods may, for example, be used in the processing of the waste streams from the chlorination o... | 10/05/2004 |
| 6653066 | Device and method for detecting polyvalent substances Disclosed is a device and method of use for detecting polyvalent analytes such as antibody to the AIDS virus, utilizing an inverse sandwich method. The test device comprises a first substance having an epitope, bound to a label and capable of moving withi... | 11/25/2003 |
| 6645458 | Method for making an aqueous sodium chloride solution Process for the manufacture of an aqueous sodium chloride solution, according to which a solid material comprising sodium chloride and heavy metals is dispersed in water, the aqueous medium thus obtained is alkalinized so as to precipitate the heavy metal... | 11/11/2003 |
| 6485629 | Process for separation of heavy metals from residues by use of ethylene-diamine-disuccinic acid (edds) complexant A process for separating a first source of a heavy metal ion or mixtures of heavy metal ions, (Me1), from a solution comprising a complex of said Me1 and EDDS, (Me1 -EDDS), by displacement of said Me1 with a sec... | 11/26/2002 |
| 6328938 | Manufacture of titanium dioxide with recycle of waste metal chloride stream A method for the integration of a manufacturing facility with a salt dome, which manufacturing facility is one for the production of high purity titanium dioxide using chlorine as a reactant. The metal chlorides produced as a by-product of titanium dioxid... | 12/11/2001 |
| 6149883 | Pressure oxidation process for the production of molybdenum trioxide from molybdenite Molybdenum trioxide is produced from molybdenite by a pressure oxidation process comprising of the steps of forming an aqueous slurry of molybdenite, pressure oxidizing the slurry to form soluble and insoluble molybdenum species, converting the insoluble ... | 11/21/2000 |
| 6113868 | Process for treating tungstate solutions to reduce molybdenum impurity and other impurity content Tungstate solutions are purified by a precipitation process followed by two anion exchange processes to reduce molybdenum and arsenic impurity content. The precipitation involves acidification of the original highly basic tungstate solution to pH of 7 to ... | 09/05/2000 |
| 5980749 | Inclusion methods for purifying a solvent Disclosed are methods for purifying solvents, by causing contaminants to be included within layers of dispersed layered materials, and then separating the restacked combined contaminant/layered material from the solvent. The methods may be utilized to rem... | 11/09/1999 |
| 5961879 | Process for the manufacture of hypochlorite bleaching compositions The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising hypochlorite, a strong source of alkalinity and water, said process comprising the steps of: mixing said alkali metal hypochlorite, said stro... | 10/05/1999 |
| 5928559 | Process for the manufacture of hypochlorite bleaching compositions The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising alkali metal hypochlorite, a strong source of alkalinity and water; said process comprising the steps of: mixing alkali metal hypochlorite, s... | 07/27/1999 |
| 5820844 | Method for the production of a purified MoO3 composition A method for producing purified MoO3 from MoS2. MoS2 is initially oxidized to generate an impure MoO3 product containing metallic contaminants and molybdenum sub-oxides. This product is then slurried with a prim... | 10/13/1998 |
| 5804151 | Process for autoclaving molybdenum disulfide A method for producing MoO3 from MoS2. MoS2 is combined with water to form a slurry which is then combined with at least one oxygen-containing oxidizing gas in a reaction chamber in order to initiate oxidization and conver... | 09/08/1998 |
| 5676817 | Process for the production of pure solutions of tungsten and molybdenum Process for the production of pure tungsten and/or molybdenum solutions from sources, such as alkaline decomposition solutions, which are contaminated with tantalum, niobium, titanium, aluminium, tin, arsenic, phosphorus and/or silicon, by application of ... | 10/14/1997 |
| 5599514 | Process for recovering cobalt and tungsten from reaction liquors Process for recovering and re-using cobalt and tungsten from reaction liquors, in which said reaction liquors are treated: a) With an alkali-earth metal hydroxide in order to precipitate cobalt and tungsten, and the resulting precipitate is subsequently treate... | 02/04/1997 |
| 5594929 | Method of preparing powders for hard materials According to the invention there is now provided a simple method of preparing a powder containing WC and cobalt and/or nickel. APT-powder and a powder of a basic salt of cobalt and/or cobalt are mixed in water or in mixed solvents. The suspension is stirr... | 01/14/1997 |
| 5503813 | Molybdenum recovery from epoxidate Epoxidate from the molybdenum catalyzed epoxidation of an olefin such as propylene with a hydroperoxide such as ethylbenzene hydroperoxide is treated with 2 to 15 times the stoichiometric equivalent of aqueous base such as sodium hydroxide to form Na... | 04/02/1996 |
| 5427692 | Removal of chromium from solution using ferrous sulfate and barium nitrate Hexavalent chromium is removed from aqueous sodium nitrate solutions by reacting hexavalent chromium with an aqueous slurry consisting essentially of ferrous hydroxide and barium sulfate whereby the chromium is reduced to trivalent chromium and precipitat... | 06/27/1995 |
| 5417945 | Process for recovering tungsten as an ammoniacal tungstate compound in which ammoniacal tungstate liquors are reclaimed A process for recovering tungsten as an ammoniacal tungstate which comprises reacting a tungsten containing material with sodium hydroxide to produce sodium tungstate and forming a first aqueous sodium tungstate solution therefrom, crystallizing sodium tu... | 05/23/1995 |
| 5415848 | Method for removal of hexavalent chromium from a solution A process for removing chromium from an aqueous electrolyte solution is disclosed. The process involves admixing with the solution an amount of a chromium-reducing compound and an amount of a precipitant for the anion of the chromium-reducing compound. Th... | 05/16/1995 |
| 5407650 | Process for purifying a technical iron chloride solution by selective precipitation A process for purifying an acidic technical-grade iron chloride solution formed from cyclone dust from the production of TiO2 in accordance with the chloride process by adjusting the pH with a first neutralizing agent and thereafter introducing... | 04/18/1995 |
| 5401833 | Method and apparatus for treating chrome leather waste An improved method and apparatus for treating chromium containing leather scrap to recover chromium compounds and to produce a protein hydrolysate. The leather scrap is fed into an upstream mixing zone of a reaction vessel along with an alkali metal solut... | 03/28/1995 |
| 5397478 | Fixation and stabilization of chromium in contaminated materials A highly flexible multi-step treatment technology for chemical fixation and stabilization of leachable chromium, particularly hexavalent chrome, in contaminated soils, solid wastes, concrete, sludge, sand and gravel and waste waters is disclosed. The proc... | 03/14/1995 |
