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| Number | Title | Issue Date |
| 7186394 | Retarding agents for preparing purified brine The invention relates to a process to produce brine of improved purity wherein a salt source, contaminated with sulphate ions and alkaline (earth) metal ions, is dissolved in water in the presence of an effective amount of a retarding agent comprising at least one l... | 03/06/2007 |
| 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 |
| 7041268 | Process for recovery of sulphate of potash The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the ... | 05/09/2006 |
| 7014832 | Simultaneous recovery of potassium chloride and KCL enriched edible salt The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density... | 03/21/2006 |
| 6547836 | Process for obtaining monohydrated lithium sulfate from natural brines A process for obtaining monochlorated lithium sulfate from natural brines by mixing two brines: one saturated or nearly saturated with silvite (KCl), carnallite (KCl, MgCl2.6H.sub.2 O), and lithium sulfate (Li2 SO4.H.sub.2... | 04/15/2003 |
| 6500216 | Method and apparatus for desalinating sea water, natural salt and fresh water A method and an apparatus of producing natural salt or fresh water by treating sea water in an extremely short period of time and with high efficiently. The distilled water and salt components are treated for expediting crystallization of the salt compone... | 12/31/2002 |
| 6464736 | Recrystallization process The present invention provides a process for producing crystals of a polymorphic compound in a first crystal structure by introduction of the compound in a second crystal structure into a saturated brine solution of the compound under conditions in which ... | 10/15/2002 |
| 6267789 | Method for enriching raw salt Process for enriching crude salt, in which the crude salt is ground and then cooled in a saturated aqueous sodium chloride solution, to a temperature below the anhydrous sodium chloride to sodium chloride dihydrate transition temperature, a stock of a pow... | 07/31/2001 |
| 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 |
| 5871551 | Process for the preparation of anhydrous sodium sulfate A process for the preparation of anhydrous sodium from a thenardite ore containing sodium sulfate comprising the steps of: crushing the thenardite ore; lixiviating the crushed ore in a first lixiviation step with water or with an exhausted solution from a... | 02/16/1999 |
| 5503641 | Process and apparatus for preparing a potassium chloride mixture A potassium chloride mixture with grains of different sizes is extracted in a first stage with an unsaturated solution at an elevated temperature, whereby the finest grains are completely dissolved and the coarse proportions are caused to start dissolutio... | 04/02/1996 |
| 5329014 | Method for recovering optically active tryptophan Optically active tryptophan of high purity can be obtained in high yields from a tryptophan fermentation broth, using crystallization of optically active tryptophan hydrochloride in combination with concurrent neutralization crystallization. According to ... | 07/12/1994 |
| 5126019 | Purification of chlor-alkali membrane cell brine This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions s... | 06/30/1992 |
| 5084260 | Method for producing pure boric acid Pure boric acid is obtained by a high-yield method with a non-pollutant effluent discharge, comprising the following stages carried out in succession: a) dissolving impure boric acid in an aqueous vehicle to form an aqueous solution of impure boric acid; ... | 01/28/1992 |
| 5028302 | Purification of chlor-alkali membrane cell brine This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions s... | 07/02/1991 |
| 4723962 | Process for recovering lithium from salt brines An improved process is described for recovering lithium from evaporatively concentrated brines. Epsom salt recovered from the brine at about 0° C. is added to the concentrated lithium-containing brine, so as to precipitate lithium sulfate monohydrate, th... | 02/09/1988 |
| 4603033 | Salt harvester for harvesting salt in elongated solar salt crystallizer An improved harvester for harvesting a salt crop from the bottom of a shallow, elongated solar crystallizer containing a substantially saturated salt solution overlying the salt crop. The harvester includes track means extending longitudinally along the s... | 07/29/1986 |
| 4564508 | Process for the recovery of sodium carbonate from salt mixtures Mined salt mixtures comprising sodium-carbonate, -bicarbonate, -chloride, -sulfate, and -double salts, such as trona and burkeite, are leached with a bicarbonate-saturated solution and added carbon dioxide to selectively dissolve the sodium chloride, sodi... | 01/14/1986 |
| 4562058 | Process for crystallizing potassium sulfate An improved process for the production of potassium sulfate crystals by the reaction of saturated solution of potassium chloride with langbeinite in the solid phase at a temperature of from 45°-55° C., thereby forming potassium sulfate crystals and magn... | 12/31/1985 |
| 4533536 | Process for the manufacture of potassium sulphate by treating solutions containing magnesium chloride and potassium chloride Process for the manufacture of potassium sulphate from solutions containing magnesium chloride and potassium chloride from solutions, more particularly from mother liquors issuing from the treatment of carnallite. According to this process sodium sulphate... | 08/06/1985 |
| 4533360 | Method of obtaining magnesium sulphate from mixtures of salts Method of extracting magnesium sulphate from mixtures constituted essentially of magnesium sulphate heptahydrate and sodium chloride by means of heat treatment, grinding and dry grading.... | 08/06/1985 |
| 4396591 | Recovery of hydrogen iodide A method of extraction of HI from an aqueous solution of HI and I2. HBr is added to create a two-phase liquid mixture wherein a dry phase consists essentially of HBr, I and HI and is in equilibrium with a wet phase having a far greater HBr:HI r... | 08/02/1983 |
| 4386936 | Production of potassium chloride using pond crystallization Disclosed is a method of increasing and maintaining high concentrations of potassium chloride in a refinery process stream of brine containing potassium chloride, sodium chloride and a minor amount of salt impurities by mixing with a first process stream ... | 06/07/1983 |
| 4306880 | Recovering by-products from sea water brines and the like The improved production of sodium sulfate, potassium sulfate and other valuable salts from salt plant bitterns or the like wherein initial reduction in sulfate ion concentration yields salt cake and greatly facilitates the selective recovery of potassium ... | 12/22/1981 |
| 4287163 | Process for recovering lithium from brine by salting out lithium sulfate monohydrate A salting-out process for recovering lithium from brines which have been concentrated by solar or thermal evaporation. Soluble sulfate salts are added to the strong brine solutions containing lithium to yield lithium sulfate monohydrate. Subsequent treatm... | 09/01/1981 |
| 4286967 | Double crystallization process to produce low organic, low silica soda ash A process for the production of low organic, low silica, anhydrous sodium carbonate comprising (a) calcining raw trona ore to produce crude sodium carbonate containing soluble and insoluble impurities, (b) admixing said crude sodium carbonate with a subst... | 09/01/1981 |
| 4271131 | Production of highly pure lithium chloride from impure brines Highly pure lithium chloride suitable for use in production of lithium metal by electrolysis is obtained directly from impure natural or other lithium chloride brines by an integrated process in which the brine is first concentrated by solar energy to a l... | 06/02/1981 |
| 4261960 | Removal of boron from lithium chloride brine Boron, as well as magnesium and sulfate impurities, are removed from or at least substantially reduced in a lithium containing brine to minimize lithium losses on further concentration of the brine by adding to the brine an aqueous slurry of slaked lime a... | 04/14/1981 |
| 4211613 | Geothermal mineral extraction system Minerals are recovered from warm geothermal brines by installing a brine eductor device such as a venturi at the end of a thermally insulated drill casing. The geothermal brine is recovered by flowing a warm, low saline carrier solution at high flow rate ... | 07/08/1980 |
| 4088451 | Concentration of underground brines in situ by solar evaporation A process is provided for the recovery of chemicals, such as chlorides, sulfates, carbonates and borates of such alkali metals as sodium and potassium, among others, from underground brines associated with an ore body containing said chemicals, wherein th... | 05/09/1978 |
| 4072472 | Production of high purity salt from high sulfate salt deposits A subterranean salt deposit is solution mined, and the resulting calcium- and sulfate-contaminated brine is treated, e.g., by soda ash, to precipitate insoluble calcium compounds. The resulting slurry is settled, and the effluent clear brine is evaporated... | 02/07/1978 |
| 4064295 | Spraying atomized particles A stream of gas atomized particles moves past a secondary gas stream towards a substrate. The secondary stream is directed in an oscillatory manner against the stream of atomized particles to deflect the latter such that the particles are distributed in a... | 12/20/1977 |
| 4026676 | Process for producing salt having a reduced calcium sulfate content A process for preparing from aqueous NaCl brine containing appreciable quantities of dissolved calcium sulfate high purity dendritic salt, characterized by an exceptionally low calcium sulfate content. The process is carried out by a "feed and bleed" proc... | 05/31/1977 |
| 3994531 | Method of solution mining potassium chloride from subterranean deposits The present invention relates to an improved method of solution mining potassium chloride from subterranean ore deposits containing both potassium chloride and sodium chloride. By the present invention, an aqueous medium is passed through the ore deposits... | 11/30/1976 |
| 3977835 | Cooling process for selective salt crystallization Salable salt values in a complex brine are recovered by cooling to crystallize mirabilite, then using solar evaporations to recover readily processable groupings of sodium salts and potassium salts.... | 08/31/1976 |
| 3967930 | Separation of complex potassium salts from brine evaporites Evaporite minerals comprising mixtures of relatively coarse salts are treated in a manner such that certain of said salts are converted by recrystallization to very finely divided form and then separated from the coarse salts by size classification such a... | 07/06/1976 |
| 3966539 | Process for extracting dissolved salts from water Evaporation of water from a salt-saturated liquid is facilitated by adding a particulate solid having a density greater than that of the saturated liquid, and by maintaining a thin surface layer of liquid by settlement of the solids to leave an optimum on... | 06/29/1976 |
