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| Number | Title | Issue Date |
| 8075868 | Iron arsenate powder There is provided an iron arsenate powder which is produced from an arsenic containing solution and wherein the concentration of arsenic eluted or released from the powder is very low. The iron arsenate powder is a powder of dihydrate of iron arsenate, which has a c... | 12/13/2011 |
| 7338647 | Synthesis of cathode active materials The present invention relates to a method for preparing an electroactive metal polyanion or a mixed metal polyanion comprising forming a slurry comprising a polymeric material, a solvent, a polyanion source or alkali metal polyanion source and at least one metal ion... | 03/04/2008 |
| 7255962 | Eulytite solid acid electrolytes for electrochemical devices Improved solid acid electrolyte materials, methods of synthesizing such materials, and electrochemical devices incorporating such materials are provided. The stable electrolyte material comprises a solid acid in a eulytine structure capable of undergoing rotational ... | 08/14/2007 |
| 6890500 | Salt-templated microporous solids The invention is directed to open-framework and microporous solids well suited for use in catalysis and ion exchange. The microporous solids are constructed by using a salt template which can be readily removed without destroying the framework of the micropore. Vari... | 05/10/2005 |
| 6821434 | System for removal of arsenic from water Systems for removing arsenic from water by addition of inexpensive and commonly available magnesium oxide, magnesium hydroxide, calcium oxide, or calcium hydroxide to the water. The hydroxide has a strong chemical affinity for arsenic and rapidly adsorbs arsenic, ev... | 11/23/2004 |
| 6719955 | Salt-templated microporous solids The invention is directed to open-framework and microporous solids well suited for use in catalysis and ion exchange. The microporous solids are constructed by using a salt template which can be readily removed without destroying the framework of the micropore. Vari... | 04/13/2004 |
| 6682712 | Process for the preparation of lithium hexafluoroarsenate The present invention provides a novel thermal solid state method for the synthesis of lithium hexfluoroarsenate either in a two step or a single step method, preferably at last substantially in the solid state.... | 01/27/2004 |
| 6616744 | Method of forming inorganic pigments The present invention provides a method of forming inorganic pigments using one or more metal alloys. Metal alloys used in the method of the invention are preferably milled to a mean particle size of less than about 10 microns, may be mixed with other met... | 09/09/2003 |
| 6613926 | Perchloramido phosphonyl reagents and analogs thereof Novel compounds are provided in the form of nucleoside pyrophosphate and triphosphate analogs. In these analogs, the pyrophosphate or triphosphate group is replaced with a moiety that is isosterically and electronically identical thereto, but is hydrolyti... | 09/02/2003 |
| 6177015 | Process for reducing the concentration of dissolved metals and metalloids in an aqueous solution An aqueous solution, for example, effluent from an off-gas scrubber, is treated to remove metal and metalloid ions by in situ precipitation of ferrous ions by the addition thereto of a ferrous ion-containing solution, salt or other such ferrous ion-contai... | 01/23/2001 |
| 5411723 | Process for reducing the damage susceptibility in optical quality crystals A process is disclosed for treating a crystal of MTiOXO4 which has crystal structure deficiencies of M and O, wherein M is selected from the group consisting of K, Rb, Tl and NH4 and mixtures thereof and X is selected from the group ... | 05/02/1995 |
| 5348662 | Process for removing heavy metals from aqueous solutions In the process of removing heavy metals from aqueous solutions (groundwater) by precipitation of a salt thereof, an oxidizing agent is optionally used to increase the valence of said metal, and a precipitation-enhancing agent is added to maximize particle... | 09/20/1994 |
| 5344479 | Upgrading copper sulphide residues containing nickel and arsenic A process is disclosed for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte is leached in aqueous sulphuric acid solution under oxidizing conditions at atm... | 09/06/1994 |
| 5281405 | Optically useful compositions and a sol-gel process for their production A sol-gel process is disclosed for preparing MTiOXO4 when M is K, Rb, Tl and/or NH4 and X is P and/or As which involves dissolving suitable compounds of M, Ti and X in stoichiometic amounts in a suitable organic liquid, and then prod... | 01/25/1994 |
| 5262063 | Multiple-stage precipitation process for heavy metals in aqueous solution In the process of removing heavy metals from aqueous solutions by precipitation of a salt thereof at increased pH, multiple stage precipitation by upward stepwise pH adjustment and solid separation at each stage is used to facilitate the manufacture of a ... | 11/16/1993 |
| 5141753 | Method for utilizing the copper-arsenic precipitate created in the electroytic refining of copper in the production of anti-rot agents for wood The invention relates to a method for producing wood anti-rot agent of the copper-arsenic precipitate created in the solution purification of copper electrolysis, or of some other corresponding precipitate.... | 08/25/1992 |
| 5137640 | Process for the separation of arsenic acid from a sulfuric acid-containing solution A process for reducing arsenic levels in a solution containing sulfuric acid, water, and arsenic acid by adding copper or a copper-containing compound to the solution to form dissolved copper arsenate, adding alkali solution to precipitate the copper arse... | 08/11/1992 |
| 5126116 | Method for forming copper arsenate The invention provides a method of forming copper arsenate. Copper and arsenic are leached into a treatment solution maintained at a pH level of about 2 to 5 in the presence of at least one impurity. An oxidant is added to the treatment solution to oxidiz... | 06/30/1992 |
| 5114592 | Procedure for separating arsenic from waste material The invention involves a process as well as apparatus for the separation of arsenic from waste material. The process includes precipitation of arsenic in the form of low solubility calcium magnesium arsenates by adding calcium and magnesium compounds to t... | 05/19/1992 |
| 5093007 | Process for removal of inorganic and cyanide contaminants from wastewater An improved process for removal of soluble contaminants from wastewater is disclosed which provides significantly enhanced contaminant removal and overall process efficiencies. The improved contaminant removal process is especially suitable for treatment ... | 03/03/1992 |
| 5072031 | Layered divalent metal phosphates containing pendent substituent groups and their preparation Layered divalent metal pentavalent metallate, M(HAO4)x (RAO3)y (Z)z wherein M is divalent metal, A is a pentavalent metal, e.g. phosphorus, R is a substituent group other than H or OH, e.g., phenyl, c... | 12/10/1991 |
| 5026530 | Method for producing copper arsenate compositions A method of preparing copper arsenate compositions having unique advantges in lower cost and higher performance for use in preparing chromated copper arsenate wood preserving formulations. These copper arsenate compositions are insoluble copper arsenate i... | 06/25/1991 |
| 5002748 | Method for the preparation of copper arsenate Copper arsenate, substantially free from impurities that form sludge in wood preservatives such as chromated copper arsenate, is prepared by adding a solution of soluble arsenate to copper sulfate solution, either or both solutions containing sludge-formi... | 03/26/1991 |
| 4962228 | Layered divalent metal phosphates containing pendent substituent groups and their preparation Layered divalent metal pentavalent metallate, M(HAO4)x (RAO3)y (Z)z wherein M is divalent metal, A is a pentavalent metal, e.g. phosphorus, R is a substituent group other than H or OH, e.g., phenyl, c... | 10/09/1990 |
| 4961909 | Process for the manufacture of copper arsenate In a process for the manufacture of copper arsenate, an arsenic-containing material is subjected to an oxidative pressure leach with sodium hydroxide forming a leach solution containing sodium arsenate. Sodium arsenate solution is mixed with a solution of... | 10/09/1990 |
| 4959203 | Preparation of copper arsenate Copper arsenate, substantially free from impurities that will form a sludge in the process for producing wood preservatives such as chromated copper aresenate and having a water content of less than 15%, is prepared by mixing a solution of soluble arsenat... | 09/25/1990 |
| 4891067 | Processes for the treatment of smelter flue dust A process for the treatment of flue dust from copper and lead smelters includes the steps of subjecting a slurry (10) of water and flue dust to a first caustic leach (12) to form a first liquids soluble sulfate solution (14) and a first solids portion (15... | 01/02/1990 |
| 4878945 | Hydrometallurgical process for treating refractory ores containing precious metals This invention is directed to an improved process for leach treating gold and silver bearing pyritic and arsenopyritic concentrates and ores. More particularly, the improved process avoids the necessity of adding recycled neutralized solution to the leach... | 11/07/1989 |
| 4842698 | Solid state arsenic probe for use in pyrometallurgical processes A potentiometric electrochemical sensor for detecting gaseous concentrations of arsenic oxides or arsenic-bearing species at elevated temperatures. The sensor is comprised of: an ionically conducting solid state membrane which may be made of silver zircon... | 06/27/1989 |
| 4804494 | Wood preservative compositions and a process for their production A copper arsenate composition suitable for incorporation in a copper/chrome/arsenic wood preservative composition is made by reacting copper metal with a source of 5-valent arsenic such as arsenic acid under the oxidizing influence of hydrogen peroxide. T... | 02/14/1989 |
| 4655829 | Metal recovery process Metal values are separated from arsenic sulfide ores in a hydrometallurgical oxidation process using a balanced reactant slurry. The molar concentration of As and Sb in the reactant slurry is controlled with respect to the molar concentration of Cu, Pb, a... | 04/07/1987 |
| 4647307 | Process for recovering gold and silver from refractory ores A process for the hydrometallurgical recovery of precious metal from an ore or concentrate containing at least some arsenopyrite or pyrite. The process comprises forming in a common volume space a gas phase and a liquid slurry comprising the ore or concen... | 03/03/1987 |
| 4629656 | Ion exchange inorganic films made up of layered structure insoluble acid salts or tetravalent metals and/or their derivatives, and process for the preparation of same Ion exchange inorganic films made up of alpha-type or gamma-type layered structure insoluble acid salts of tetravalent metals or their salt forms, or their intercalated forms or their organic derivatives containing polar groups. A process for the preparat... | 12/16/1986 |
| 4610723 | Process for leaching sulphide concentrates of the tetrahedrite type containing high concentrations of arsenic and antimony A process for lixiviation of concentrates of copper sulphides of tetrahedral type containing high concentration of arsenic and antimony to recover copper and noble metals. The concentrates are repulped into an aqueous ferrous sulphate solution with an est... | 09/09/1986 |
| 4405569 | Hydrometallurgical process for extracting metal values from complex ores containing arsenic and sulfur This invention relates to environmentally sound hydrometallurgical methods and processes for extraction of cobalt, nickel and silver from complex concentrates. The finely ground minerals are converted during an oxidative caustic leach at elevated pressure... | 09/20/1983 |
| 4376709 | Intercalated layered mixed oxides New intercalated compounds comprising a cation intercalated in a layered mixed oxide, said oxide having layers of corner linked octahedra and tetrahedra. The composition has the formula Aq MOXO4.nH.sub.2 O where A is a monovalent, di... | 03/15/1983 |
| 4369164 | Recovery of copper from arsenical drosses by ammonium arsenate leach A process for leaching copper and arsenic from copper dross containing copper arsenide and separated from molten lead bullion comprises leaching the dross with an aqueous ammoniacal solution containing arsenate as the predominant anion under oxidizing con... | 01/18/1983 |
| 4366128 | Removal of arsenic from aqueous solutions A process for removing arsenic from an aqueous solution containing arsenic in the form of a soluble arsenate includes adjusting the pH of the solution if necessary to at least about 10, adding a soluble barium salt to precipitate arsenic as barium arsenat... | 12/28/1982 |
| 4244927 | Process for recovering arsenic compounds by sodium hydroxide leaching An arsenic-recovery process primarily for use in conjunction with the hydrometallurgical processing of arsenic-containing materials for metal recovery. Arsenic is recovered from ferric arsenate by reaction with sodium hydroxide in accordance with the foll... | 01/13/1981 |
| 4087511 | Glasses prepared by the melting of stoichiometric compounds Chemically durable non-silicate glasses derived from compounds including phosphates, borates, arsenates, sulfates, tellurates, tellurites, germanates and the like, are prepared by forming a melt from monobasic compounds of stoichiometric proportions, said... | 05/02/1978 |
