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7611208 |
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...
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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...
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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, MgCl 2 .6H 2 O), and lithium...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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4396591 |
Recovery of hydrogen iodide
A method of extraction of HI from an aqueous solution of HI and I 2 . HBr is added to create a two-phase liquid mixture wherein a dry phase consists essentially of HBr, I and HI and is in...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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3925028 |
Treatment of seawater brines with an alcohol to recover a fertilizer quality double salt
The present invention relates to a novel method for the recovery of potassium and magnesium salts in the form of insoluble precipitates of potassium sulfate together with magnesium sulfate and or...
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3917801 |
Flotation of boric acid from sodium sulfate obtained during the processing of borate ores
Clean crystalline boric acid is isolated from a slurry, obtained by reaction between a borate ore and sulfuric acid, and seriously contaminated with clay slimes and sodium sulfate, by the steps of...
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3910773 |
Beneficiation of salts crystallized from searles lake brine
Solar evaporation is used to selectively crystallize readily processable sodium and potassium salt groupings from a complex brine, such as Searles Lake brine. The harvested salt groupings are then...
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3904520 |
Process for the clarification of brine
Sylvinite plant brine thickener underflow, which comprises an essentially saturated sodium chloride-potassium chloride brine containing clay slimes in amounts such as 5% and ore fines in amounts...
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3895920 |
Method of producing coarse potash
The disclosure describes a method for producing coarse crystals of KCl from the direct decomposition of carnallite by mixing crushed carnallite in a high MgCl 2 liquor to form a non-decomposed...
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3891397 |
Crystallization of sodium chloride of reduced calcium sulfate content in presence of about 5 to about 500 ppm
A process for preparing from brine (an aqueous solution of salt) containing appreciable quantities of dissolved calcium sulfate either (1) high purity salt (sodium chloride) having the usual cubic...
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3852044 |
RECOVERY OF SUBSTANTIALLY POTASSIUM-FREE HYDRATED MAGNESIUM CHLORIDE FROM CONTAMINATED AQUEOUS SOLUTIONS
Aqueous solutions containing magnesium chloride as the major dissolved salt but contaminated with sulfate, potassium and sodium to the extent that magnesium chloride produced by evaporating the...
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3779030 |
METHOD OF MAKING SODIUM CHLORIDE CONCENTRATE FROM SEA WATER
A continuous method of producing a sodium chloride concentrate from sea water which comprises initially seeding sea water with sodium chloride, cooling this admixture to approximately the eutectic...
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3677475 |
BENEFICIATION OF CLAY-CONTAINING SYLVINITE ORE
Coarse clay-containing sylvinite is subjected to gravity separation and the overflow is divided into two portions by sizing at about one-quarter inch. The finer fraction is subjected to a gravity...
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3644102 |
CRYSTALLIZATION OF POTASSIUM CHLORIDE FROM CARNALLITE DECOMPOSITION
Carnallite is decomposed by adding it to water under optimum conditions so that potassium chloride may be crystallized therefrom using potassium chloride seed crystals of over 60 mesh size.
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3642454 |
PRODUCTION OF POTASSIUM CHLORIDE FROM CARNALLITIC SALTS
Potassium chloride is produced from carnallitic salts consisting essentially of carnallite KCl . MgCl 2 . 6H 2 O) and halite (NaCl). The salt is contacted with an aqueous medium to dissolve...
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3637348 |
CONTROL OF POSTPRECIPITATION FROM WET PROCESS PHOSPHORIC ACID
This invention is directed to controlling the rate and amount of postprecipitate that forms in merchant grade phosphoric acid by treating the acid with cresylic acid, picoline, pyridine and their...
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3634041 |
METHOD FOR THE PRODUCTION OF POTASSIUM SULFATE FROM POTASSIUM-CONTAINING DOUBLE SALTS OF MAGNESIUM SULFATE
Essentially pure schoenite is leached to produce potassium sulfate and a sulfate leach liquor. The sulfate leach liquor is then brought into contact with a crystal crop predominating in...
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3615259 |
SOLAR POND SYSTEM FOR THE PRODUCTION OF CONCENTRATED BRINES UTILIZING PLURAL SERIAL SOLAR SUBZONES
A solar evaporation zone receives a brine of a given concentration with respect to a particular soluble salt and produces effluent brine of a higher concentration with respect to that salt. A...
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3615174 |
PROCESS FOR THE SELECTIVE RECOVERY OF POTASSIUM AND MAGNESIUM VALUES FROM AQUEOUS SALT SOLUTIONS CONTAINING THE SAME
Kainite immersed in brine in equilibrium converted to carnallite by cooling to about 10° C. or under. Carnallite so obtained purified by cold flotation. Purified carnallite water leached to yield...
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3441386 |
LEACHING POTASSIUM SALTS FROM MIXTURES IN THE PRESENCE OF SOLUBLE FERRIC,CHROMIC AND ALUMINUM SALTS
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3440023 |
OBTAINING KCI FROM CRUDE SALTS BY EQUILIBRATING AND DILUTING PRIOR TO PRECIPITATION
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