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| Number | Title | Issue Date |
| 7754169 | Methods and systems for utilizing waste sources of metal oxides Methods are provided for producing a composition comprising carbonates, wherein the methods comprise utilizing waste sources of metal oxides. An aqueous solution of divalent cations, some or all of which are derived from a waste source of metal oxides, may be contac... | 07/13/2010 |
| 7722842 | Carbon dioxide sequestration using alkaline earth metal-bearing minerals A method for mineral sequestration of pollutant gases resulting from the combustion of carbon-based fuels such as carbon and sulfur dioxides is provided and includes, providing a particulate magnesium-containing mineral and exposing the magnesium-containing mineral ... | 05/25/2010 |
| 7300539 | Treatment of solid containing material derived from effluent A method of treating solid containing material derived from effluent or sludge from a plant for deinking paper, the material containing calcium in the form of one or more insoluble calcium compounds, the method including the steps of treating the material with an ac... | 11/27/2007 |
| 7247284 | Method and apparatus for regeneration of flue gas scrubber caustic solutions A process to regenerate wet flue gas scrubber purge liquid into NaOH caustic suitable for make-up caustic for the scrubber is disclosed. Further, sulfur is removed from waste effluent in the form of gypsum with the process described herein. Lime is added to the spen... | 07/24/2007 |
| 7238331 | Process for producing nano-powders and powders of nano-particle loose aggregate The present invention discloses a process for producing nano-powders and powders of nano-particle loose aggregate, which includes: (a) providing at least two reactant solutions A and B capable of rapidly reacting to form deposits; (b) supplying the at least two reac... | 07/03/2007 |
| 7189306 | Process of treating lignocellulosic material to produce bio-ethanol This invention relates to a process of treating a lignocellulosic material to produce bio-ethanol. The process includes the steps of: (a) exposing the lignocellulosic material to conditions including a pH not less than about 8, and steam at a first pressure, to prod... | 03/13/2007 |
| 7179437 | Feeding device and process and feeding system which utilize the feeding device Feeding device for feeding burned lime to a reaction vessel for causticizing a soda liquor to caustic soda. The feeding device, in its upper part, comprises an inlet for a slurry of the burned lime and the soda liquor for formation of said slurry inside said feeding... | 02/20/2007 |
| 7157063 | Process for the utilization of vanadium from chromium ore as vanadium (V) oxide Process wherein the vanadium present in the chromium ore chromite is recovered as vanadium pentoxide during the course of the fusion of the chromium ore with alkali and its work-up to produce sodium chromate solution and sodium dichromate. ... | 01/02/2007 |
| 7135157 | Process for the production of platy precipitated calcium carbonates A process for the preparation of platy precipitated calcium carbonate comprising the steps of providing a suspension of calcium hydroxide, carbonating the suspension of calcium hydroxide, adding a polyacrylate to the suspension prior to the completion of carbonation... | 11/14/2006 |
| 7128887 | Platy precipitated calcium carbonate synthesis method A process for the preparation of platy PCC comprising the steps of providing a suspension of calcium hydroxide, carbonating the suspension of calcium hydroxide, adding a condensed phosphate to the suspension prior to the completion of carbonation to precipitate plat... | 10/31/2006 |
| 6989142 | Precipitated calcium carbonate An abrasive precipitated calcium carbonate is provided that provides excellent cleaning properties without being excessively abrasive or damaging to gums or tooth surfaces. The abrasive, precipitated calcium carbonate has a primary particle size of about 1 μm to ab... | 01/24/2006 |
| 6814947 | Method for producing calcium compounds containing water of crystallization The invention relates to the production of calcium compounds containing water of crystallization by means of a chemical reaction between an aqueous alkaline sodium aluminate solution and solid or dissolved or suspended calcium (hydr)-oxide in the presence of carbon ... | 11/09/2004 |
| 6811704 | Method for anion removal by forming chemical precipitation under an electric field and continuous process for anion removal The present disclosure relates to a method for removing anions such as nitrate ion, sulfate ion, chloride ion, and phosphate ion existing in underground water, surface water or waste water. The method involves adding alumina cement and a calcium compound to the wate... | 11/02/2004 |
| 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 |
| 6749825 | Mesoporous carbonates and method of making Mesoporous metal carbonate structures are formed by providing a solution containing a non-ionic surfactant and a calcium acetate salt, adding sufficient base to react with the acidic byproducts to be formed by the addition of carbon dioxide, and adding carbon dioxid... | 06/15/2004 |
| 6692710 | Method for obtaining magnesium by leaching a laterite material The present invention provides methods for the isolation and production of magnesium products from leaching of laterite material with acid. A magnesium compound is formed by downstream treatment of a leach stream after at least one of nickel or cobalt hav... | 02/17/2004 |
| 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 |
| 6592837 | Narrow size distribution ground calcium carbonate compositions Ground calcium carbonate compositions having narrow particle size distributions and a method for producing the compositions. The method involves forming a substantially dispersant-free calcium carbonate suspension, wet-grinding the suspension, and aging t... | 07/15/2003 |
| 6497850 | Recovery of lithium compounds from brines Methods and apparatus for the production of low sodium lithium carbonate and lithium chloride from a brine concentrated to about 6.0 wt % lithium are disclosed. Methods and apparatus for direct recovery of technical grade lithium chloride from the concent... | 12/24/2002 |
| 6479029 | Micronized alkaline earth metal carbonate The invention concerns a micronized alkaline earth metal carbonate prepared with or without the use of an agent preventing crystal growth, and a process for its preparation and use. The prepared micronized calcium carbonate, barium carbonate with a BET su... | 11/12/2002 |
| 6425973 | Treatment of solid containing material derived from effluent A method of treating solid containing material derived from effluent or sludge from a plant for de-inking paper, the material containing calcium in the form of one or more insoluble calcium compounds, the method including the steps of treating the materia... | 07/30/2002 |
| 6294143 | Process for the preparation of discrete particles of calcium carbonate A product and a process for the preparation of discrete calcium carbonate particles that result from preparing an aqueous calcium carbonate slurry containing carbohydrates, carbonating the aqueous calcium carbonate slurry while maintaining the selected st... | 09/25/2001 |
| 6280630 | Process for the treatment of effluent streams This invention relates to a process for removing sulphates and calcium from a water stream which includes the steps of: combining the water stream and an amount of amorphous aluminum trihydroxide (Al(OH)3); allowing the formation of ettringite ... | 08/28/2001 |
| 6267800 | Process for producing cobalt metal powder from nickel-cobalt sulphides A process for producing cobalt metal powder from nickel-cobalt sulphides wherein said nickel-cobalt sulphides are leached in an ammoniacal ammonium sulphate solution under an elevated pressure of an oxygen bearing gas, at a temperature of at least 80° C.... | 07/31/2001 |
| 6264904 | Process for recovery of cobalt by selective precipitation of cobalt-calcium double salt There is provided a process for the recovery of cobalt as cobalt (III) hexammine sulphate, comprising adding an effective amount of a calcium sulphate slurry to an ammoniacal ammonium sulphate solution containing cobalt (III) hexammine sulphate to thereby... | 07/24/2001 |
| 6193945 | Method of recovering calcium from waste material or contaminated natural calcic material Method of recovering calcium carbonate from waste material or contained natural calcic material. Calcium is recovered by prepariag an aqueous suspension the material containing calcium to be recovered and by lowering the pH of the suspension to pH | 02/27/2001 |
| 6132696 | Manufacture of precipitated calcium carbonate of improved color and stable crystalline form A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved color is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound ... | 10/17/2000 |
| 5993772 | Method for coproducing calcium carbonate and sodium hydroxide Process for the coproduction of calcium carbonate and sodium hydroxide, comprising causticizing sodium carbonate with milk of lime; separating the calcium carbonate and the sodium hydroxide formed in the causticizing stage; and carbonating a mixture of milk of... | 11/30/1999 |
| 5993759 | Production of lithium carbonate from brines Lithium carbonate can be efficiently produced from a brine by (i) removing the boron therefrom, (ii) diluting the boron-free brine, (iii) removing magnesium from the diluted brine, and (iv) adding sodium carbonate to thereby precipitate lithium carbonate.... | 11/30/1999 |
| 5986133 | Recovery of fermentation salts from dilute aqueous solutions Dilute solutions of fermentation sales may be concentrated by extracting water using low-miscibility, low-molecular-weight secondary and tertiary amines, e.g. triethylamine (TEA), diisopropyl amine (DIA), N,N-diethylmethylamine (DEMA), and mixtures thereo... | 11/16/1999 |
| 5961941 | Production of precipitated calcium carbonate from papermaking sludge and sludge-derived ash Extraction of calcium salts from papermaking sludge or sludge-derived ash is accomplished by mixing with a solution of an inorganic or organic acid. The acid extraction typically results in solubilization of other salts as well, e.g., those of aluminum, m... | 10/05/1999 |
| 5939036 | Manufacture of precipitated calcium carbonate A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved colour is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound... | 08/17/1999 |
| 5927288 | Hydromagnesite/magnesium hydroxide fillers for smoking article wrappers and methods for making same Hydromagnesite-magnesium hydroxide compositions are prepared which, when used as fillers in smoking article wrappers, significantly reduce the amount of sidestream smoke produced by the burning smoking article while providing the smoking article with good... | 07/27/1999 |
| 5919424 | Method of recovering minerals from papermaking sludge and sludge-derived ash Extraction of minerals from papermaking sludge or sludge-derived ash is accomplished by mixing with a solution of an inorganic or organic acid--generally 0.1% to 35% by weight, preferably 2% to 20%, and most preferably 3% to 8% by weight. In preferred emb... | 07/06/1999 |
| 5900221 | Process of preparing a solution of cesium and rubidium salts The process for preparing a cesium and rubidium salt-containing solution includes a hydrothermal digestion of an uncalcined pollucite and/or calcined lepidolite particulate having an average particle size up to 0.5 mm with an aqueous solution of Ca(OH) | 05/04/1999 |
| 5865898 | Methods of biomass pretreatment The invention is directed to methods for the pretreatment of a lignocellulose-containing biomass. Pretreatment comprises the addition of calcium hydroxide and water to the biomass to form a mixture, and subjecting the mixture to relatively high temperatur... | 02/02/1999 |
| 5846501 | Process for the selective recovery of the salt constituents from used hardening shop salts which contain nitrite-nitrate In order to recover in an environmentally sound and economic manner used hardening shop salts which contain nitrate-nitrite, the salts, comminuted to particle sizes of from 1 to 50 mm, are dissolved in a mixture of nitric acid and hydrogen peroxide withou... | 12/08/1998 |
| 5779464 | Calcium carbonate sorbent and methods of making and using same A novel CaCO3 sorbent with its physical properties tailored for high SO2 removal is produced in accordance with the present invention. The surface area, porosity and the distribution of pore sizes of the sorbent have been designed an... | 07/14/1998 |
| 5693296 | Calcium hydroxide pretreatment of biomass Lignocellulose-containing materials are treated with lime (calcium hydroxide) and water at a relatively high temperature and for a certain period of time under certain conditions. The process variables were: lime loading which ranged from about 2 to about... | 12/02/1997 |
| 5593650 | Method for producing a high-density saline cesium and rubidium solution The method of making a high density saline cesium and rubidium solution includes comminuting uncalcined pollucite and/or calcined lepidolite to a grain size of less than 0.1 mm; combining the comminuted material in the presence of water with Ca(OH)2 | 01/14/1997 |
