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| Number | Title | Issue Date |
| 8057765 | Methods for constructing underground borehole configurations and related solution mining methods Disclosed are methods for solution mining of evaporite minerals, such as trona, comprising drilling an access well and at least two lateral boreholes; injecting a fluid; circulating the fluid through the lateral boreholes with a controlled fluid flow; and collecting... | 11/15/2011 |
| 7517509 | Purification of trona ores by conditioning with an oil-in-water emulsion The present invention is a trona concentrate and a process for floating gangue material from trona ore that comprises forming an emulsion, conditioning the trona ore at a high solids content in a saturated trona suspension, and then floating and removing the gangue ... | 04/14/2009 |
| 7507388 | Process for production of dense soda, light soda, sodium bicarbonate and sodium silicate from solutions containing bicarbonate A process related to sodium chemicals production, including the processing of bicarbonate containing solutions obtained by solution mining of trona, nahcolite or wegscheiderite reserves and the lake waters containing bicarbonates, includes the steps of purification,... | 03/24/2009 |
| 7410627 | Sodium carbonate and sodium bicarbonate production A method for solution mining nahcolite, capable of extracting nahcolite from geological formations lean in nahcolite comprising injecting high pressure water (which may include recycled aqueous solution of bicarb and sodium carbonate) at a temperature of at least 25... | 08/12/2008 |
| 7371337 | Zinc oxide powder aggregates present in circular, ellipsoidal, linear and branched form Pyrogenically prepared zinc oxide powder having a BET surface area of from 10 to 200 m2/g, which is in the form of aggregates, the aggregates being composed of particles having different morphologies, and 0-10% of the aggregates being in a circular form, ... | 05/13/2008 |
| 7255841 | Sodium bicarbonate production method A method of producing sodium bicarbonate having a high degree of purity and obtaining a net reduction in effluent waste water, as compared to prior processes, when starting from trona ore is disclosed. The process entails utilizing the waste-water effluent stream fr... | 08/14/2007 |
| 7128886 | Sodium carbonate and sodium bicarbonate production from nahcolitic oil shale A method for solution mining nahcolite, capable of extracting nahcolite from geological formations lean in nahcolite comprising injecting high pressure water (which may include recycled aqueous solution of bicarb and sodium carbonate) at a temperature of at least 25... | 10/31/2006 |
| 7077968 | Method for continuously filtering raw brine for use in chlor-alkali electrolysis The method of continuously processing raw brine with a solids content to obtain substantially solids-free pure brine (E) for use in chlor-alkali electrolysis. In this method the raw brine (A) is separated, by means of a decanter (1), into a clear brine (B) wi... | 07/18/2006 |
| 7041925 | Apparatus for the electrostatic separation of particulate mixtures Apparatus for the electrostatic separation of a mixture of particles that exhibit difference in electrical conductivity, comprising: a conductive surface to which conducting particles lose their charge; feeding means for feeding the mixture of particles onto the con... | 05/09/2006 |
| 7018594 | Crystallization of sodium carbonate decahydrate from liquors supersaturated in sodium bicarbonate A process for recovering sodium carbonate decahydrate crystals from solutions and mother liquors supersaturated in sodium bicarbonate concentration. Feed liquors containing higher levels of sodium bicarbonate than traditionally fed to a sodium carbonate decahydrate ... | 03/28/2006 |
| 6951992 | Corona and static electrode assembly A corona and static electrode assembly is attachable to a frame of an existing electrostatic separator and includes a pair of oppositely spaced end panels and an elongate corona support member disposed inwardly of and supported by the respective end panels. The coro... | 10/04/2005 |
| 6667021 | Method for producing enhanced sodium carbonate crystals for making sodium bicarbonate n the manufacture of sodium carbonate having increased CO2 uptakes the carbonation reaction to form sodium bicarbonate is enhanced by the addition of particular amounts of a cationic quaternary amine, selected from the family of dialkylethoxyla... | 12/23/2003 |
| 6609761 | Sodium carbonate and sodium bicarbonate production from nahcolitic oil shale A method for solution mining nahcolite, capable of extracting nahcolite from geological formations lean in nahcolite comprising injecting high pressure water (which may include recycled aqueous solution of bicarb and sodium carbonate) at a temperature of ... | 08/26/2003 |
| 6589497 | Process for preparing soda ash from solution mined bicarbonate brines A method for producing high grade soda ash from a solution mined brine containing sodium bicarbonate by processing the mine brine through a monohydrate crystallization step to the final product is described. The mine brine is treated to decompose and ther... | 07/08/2003 |
| 6576206 | Bicarbonate conversion in a carbonate monohydrate process A method for converting sodium bicarbonate in a sodium carbonate monohydrate crystallization process to maintain a mother liquor composition in a sodium carbonate monohydrate crystallizer below the invariant point for the crystallizer for reducing or elim... | 06/10/2003 |
| 6576209 | Process for producing sodium salts A process for producing sodium salts, which comprises adding solid sodium carbonate to a first aqueous solution containing sodium carbonate and sodium hydrogencarbonate, to prepare a second aqueous solution, precipitating, separating and recovering from t... | 06/10/2003 |
| 6514475 | Process for the production of sodium carbonate anhydrate The invention is directed to a process for the production of sodium carbonate-anhydrate having a bulk density of at least 800 kg/m3, said process comprising: providing a suspension of solid sodium carbonate and/or solid sodium bicarbonate and/o... | 02/04/2003 |
| 6479025 | Process for the production of sodium carbonate A process for the production of sodium carbonate monohydrate is disclosed. The process includes heating a feed stream containing trona and insoluble impurities in a calcining apparatus to a temperature of less than about 350° C. to form anhydrous sodium ... | 11/12/2002 |
| 6436154 | Use of dodecylbenzene sulfonic acid or salt as a scale inhibitor The formation of scale on equipment surface in contact with sodium alkali containing brines is inhibited by the addition of an alkylbenzene sulfonic acid or salt thereof to the brines.... | 08/20/2002 |
| 6428759 | Production of feed liquors for sodium carbonate crystallization processes A process is disclosed for converting dilute brines of sodium carbonate and sodium bicarbonate to form feed solutions from which sodium based chemicals may be recovered. The sodium bicarbonate in a dilute brine is neutralized and the brine then fortified ... | 08/06/2002 |
| 6399038 | Process for making sodium carbonate Process for producing sodium carbonate, according to which a sodium sesquicarbonate ore is successively calcined and dispersed in an aqueous solution substantially saturated with hydrated sodium carbonate and the resulting aqueous suspension is subjected ... | 06/04/2002 |
| 6322767 | Process for making sodium carbonate decahydrate from sodium carbonate/bicarbonate liquors A process for forming useful sodium salts by uniquely processing dilute brine solutions having sodium bicarbonate concentrations is disclosed. The dilute brine is reduced in sodium bicarbonate content to prevent precipitation of the sodium bicarbonate in ... | 11/27/2001 |
| 6284005 | Sodium carbonate recrystallization The present invention provides a process for producing sodium carbonate monohydrate crystals by introduction of anhydrous sodium carbonate into a saturated sodium carbonate brine solution under conditions in which sodium carbonate monohydrate formation is... | 09/04/2001 |
| 6270740 | Method of producing modified sodium carbonate crystals for the production of sodium bicarbonate An improved method of purifying sodium carbonate from a natural source whereby a dissolved sodium carbonate product is treated with a cationic compound, such as a quaternary amine, to react with carbon-containing contaminants and filtering the product. Th... | 08/07/2001 |
| 6251346 | Solution mining of carbonate/bicarbonate deposits to produce soda ash A solution mining process for recovering sodium values from an underground deposit of a sodium bicarbonate containing ore is disclosed. The process involves contacting the ore with an aqueous sodium carbonate-containing solution to produce a dilute brine ... | 06/26/2001 |
| 6228335 | Process for the production of sodium carbonate crystals A process for the production of soda ash by withdrawing an aqueous mining solution containing dissolved sodium carbonate and at least about 1 wt % sodium bicarbonate from an underground alkali source; stripping CO2 gas from the withdrawn aqueou... | 05/08/2001 |
| 6207123 | Process for producing sodium salts A process for producing sodium salts, which comprises adding solid sodium carbonate to a first aqueous solution containing sodium carbonate and sodium hydrogencarbonate, to prepare a second aqueous solution, precipitating, separating and recovering from t... | 03/27/2001 |
| 6092665 | Beneficiation of saline minerals A process is provided for recovering a saline mineral from an ore containing the saline mineral and impurities. In one aspect, the process generally includes the steps of separating a first portion of impurities from the ore by density separation, electro... | 07/25/2000 |
| 6022516 | Method of reducing the formation of scale in the production of soda ash from trona and nahcolite ores The methods for decreasing scale formation in processes for the production of soda ash from trona or nahcolite ores are provided. Diphosphonic acid materials such as 1-hydroxy-ethylidene diphosphonic acid, 1-hydroxy-propylidene-1,-diphosphonic acid, ... | 02/08/2000 |
| 6022385 | Process for the manufacture of sodium carbonate crystals from minerals or solutions A method of producing sodium carbonate crystals from a sodium carbonate-containing solution including the steps of passing the sodium carbonate-containing solution to a precipitator, adding methanol to the sodium carbonate-containing solution in the preci... | 02/08/2000 |
| 6010672 | Process for producing sodium carbonate from trona ore Disclosed is a process for the production of sodium carbonate monohydrate crystals from uncalcined trona ore. The process include contacting trona ore with a saturated sodium carbonate solution at a temperature of at least about 117° C. to form a brine s... | 01/04/2000 |
| 5989505 | Method for recovery of alkali values from trona using air stripping A process for recovery of alkali values from trona in which trona is dissolved, the sodium carbonate in the feed solution is converted to sodium bicarbonate by introducing carbon dioxide, sodium bicarbonate is crystallized and separated from a mother liqu... | 11/23/1999 |
| 5955043 | Production of sodium carbonate from solution mine brine A process for forming useful sodium salts by uniquely processing dilute mine brines obtained by solution mining of a sodium bicarbonate containing ore deposit with an aqueous solvent is disclosed. The dilute mine brine is reduced in sodium bicarbonate con... | 09/21/1999 |
| 5911959 | Method for purification and production of saline minerals from trona Disclosed are a variety of processes for the purification of saline minerals and in particular, trona. Some of the processes include a combination wet and dry recovery process which results in high recovery and purification at relatively low cost. The dry... | 06/15/1999 |
| 5900220 | Soda ash processing method A process and system for separating solids from concentration soda ash solution is disclosed. In the process, a soda ash solution feed stream containing solids and other impurities is treated with a chemical coagulant to create solid particles having a di... | 05/04/1999 |
| 5783159 | Inorganic impurities removal in soda ash solutions with carbon The present invention relates to a method for reducing and removing inorganic impurities in sodium solutions by contact with activated carbon. Preferably, the activated carbon is saturated with organics. The process can provide for significant reduction o... | 07/21/1998 |
| 5770730 | Synthesis of carbodimide analogs of chlorins and bacteriochlorins and their use for diagnosis and treatment of cancer A method for the preparation of an imide derivative of purpurin by reacting hexylamine with a chlorin or bacteriochlorin having a macrocycle with a six-membered anhydride ring fused thereto, said macrocycle containing a and b rings which may be saturated ... | 06/23/1998 |
| 5766270 | Solution mining of carbonate/bicarbonate deposits to produce soda ash A solution mining process for recovering sodium values from an underground deposit of a sodium bicarbonate containing ore is disclosed. The process involves contacting the ore with an aqueous sodium carbonate-containing solution to produce a dilute brine ... | 06/16/1998 |
| 5736113 | Method for beneficiation of trona Disclosed is a method for beneficiating trona from a feedstream containing trona and impurities by a dry separation method, namely, electrostatically separating a first portion of impurities from the trona at a temperature between about 25° C. and about ... | 04/07/1998 |
| 5665327 | Process for the manufacture of anhydrous sodium carbonate Process for the manufacture of anhydrous sodium carbonate, according to which a drier kiln including a rotary drum (1) is used, sodium carbonate monohydrate is introduced into an upstream region (4) of the drum, anhydrous sodium carbonate is collected in ... | 09/09/1997 |
