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8057764 |
Production of lithium compounds directly from lithium containing 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...
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7749469 |
Process for recovering isolated uranium from spent nuclear fuel using a highly alkaline carbonate solution
Disclosed is a process for recovery of uranium from a spent nuclear fuel using a carbonate solution, characterized by excellent proliferation resistance of preventing leaching of transuranium...
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7708972 |
Method for obtaining sodium carbonate crystals
Method for producing sodium carbonate, according to which an aqueous sodium chloride solution (5) is electrolyzed in a membrane-type cell (1) from which an aqueous sodium hydroxide solution (9) is...
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7214290 |
Treatment of spent caustic refinery effluents
In the methods for treatment of caustic effluents described in the specification, a spent caustic refinery effluent is supplied to a submerged combustion gas evaporator in which hot combustion gas...
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7214355 |
Production of lithium compounds directly from lithium containing brines
Metal carbonates that are insoluble in water but that have a corresponding metal biocarbonate salt that is more than 75% by weight soluble in water are purified by preparing an aqueous slurry of...
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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...
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5866088 |
Process for preparing anhydrous magnesium halide solution and process for preparing solid titanium catalyst component for olefin polymerization
Disclosed is a process for preparing an anhydrous magnesium halide solution, comprising a step of distilling water off from an oxygen-containing organic solvent solution of hydrous magnesium halide...
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5785868 |
Method for selective separation of products at hydrothermal conditions
Sodium and borate ions are separated in supercritical water by addition of dissolved CO2 to cause precipitation of carbonates and the formation of boric acid. Carbonates and boric acid are then...
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5678240 |
Sodium to sodium carbonate conversion process
A method of converting radioactive alkali metal into a low level disposable solid waste material. The radioactive alkali metal is atomized and introduced into an aqueous caustic solution having...
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5348689 |
Molten salt destruction of alkali and alkaline earth metals
A process for destroying alkali metal and alkaline earth metal-containing wastes, such as sodium, by feeding such waste into a molten bath containing a molten salt such as sodium carbonate, or a...
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5288472 |
Process for the recovery of the sodium hydroxide and sodium chloride from the effluent of a diaphragm cell as solid sodium bicarbonate
The present invention relates to a method and process for recovering solid sodium bicarbonate, from the effluent, of the cathode compartment of a diaphragm cell that contains sodium hydroxide and...
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5275794 |
Process for producing sodium bicarbonate from natural soda salts
Production of sodium bicarbonate from natural soda deposits that may occur as natural brines or solid soda salts is disclosed. The alkalinity in these natural soda deposits consists of carbonates...
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5202062 |
Disposal method of radioactive wastes
The present invention adds carbonates or chlorides of alkaline earth metals to the radioactive wastes containing sodium sulfate and subjects sulfate group in the radioactive wastes to reduction...
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5059407 |
Liquid carbon dioxide injection in exothermic chemical reactions
The present invention is directed to an improved method for carrying out a exothermic chemical reaction with carbon dioxide in an aqueous environment. In the method, a fluid solution containing at...
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5055283 |
Method of removing sodium polysulfide from used sodium/sulfur batteries
A method for removing sodium polysulfide from used sodium/sulfur batteries provides that the cells are granulated under protective measures, the scrap is treated in a solution of sodium cyanide and...
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5053144 |
Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry
The method of the invention is advantageously applicable to realize a multistage chemical process during which liquid clarifiers suitable for the purification of water and sewage, furthermore,...
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4999323 |
Production of ceramic powders by emulsion precipitation processes and the products thereof
The invention provides new processes for the production of precursor powders for ceramic materials by emulsion precipitation, the new processes permitting the economic production with at least some...
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4654204 |
Production of sodium bicarbonate by reversion of soda-type feed salt
Sodium bicarbonate is produced by introducing solid sodium carbonate, sodium sesquicarbonate, and/or Wegscheider's salt into a reversion slurry, saturated with respect to bicarbonate and containing...
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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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4303621 |
Process for the recovery of methionine and potassium bicarbonate
Methionine and potassium are recovered from the recycling solution of the potassium carbonate-methionine process by concentrating the mother liquor after the methionine precipitation and with...
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4291002 |
Process for producing sodium carbonate from complex brines
A process for the production of sodium carbonate wherein sodium bicarbonate is recovered from a brine containing sodium carbonate by carbonation of the brine under controlled conditions. The sodium...
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4225565 |
Process for treating waste slags
In the treating of waste slags produced in the desulfurization and/or dephosphorization of molten pig iron with alkali carbonates, the alkali is recovered by extracting said waste slags with hot...
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4209399 |
Process for the working up and regeneration of wash waters containing ammonium
A process for regenerating an ammonium, heavy metal salts, ammonium nitrate nd organic substances containing wash water resulting from the production of a hydrated oxide of an actinide which...
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4164543 |
Process for regenerating brines containing sodium sulfites and sulfates
Process for regenerating brines containing simultaneously sodium sulfites and sulfates so as to produce sulfur dioxide and an alkaline solution usable for absorbing sulfur dioxide, comprising...
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4153670 |
Method of treating an alkali metal sulfide liquor
A method of treating an aqueous alkali metal sulfide-containing liquor to remove the sulfur values therefrom. Broadly, the method comprises introducing an alkaline liquor containing an alkali metal...
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4148684 |
Methods for recovery and recycling of chemicals from sodium sulfite and sodium bisulfite pulping operations
An improved method for recovering spent sodium and sulfur components in sodium sulfite and sodium bisulfite pulping operations. The method involves reduction burning of spent liquor to convert it...
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4084959 |
Method for continuous refining of a molten iron base metal
A molten iron is continuously refined in a refining vessel of a closed type using a flux composed chiefly of an alkali metal compound so as to decrease the content of P and S to a low level. The...
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4083930 |
Method of treating alkali metal sulfide and carbonate mixtures
A method of removing and preferably recovering sulfur values from an alkali metal sulfide and carbonate mixture comprising the steps of (1) introducing the mixture in an aqueous medium into a first...
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3975503 |
Method for producing alkali carbonate
A method for producing alkali carbonate crystals, including adding to an alkali carbonate and alkali hydroxide solution stream a 10 to 75 weight-% alkali hydroxide solution, charging the resulting...
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3870784 |
Sodium bicarbonate production
Coarse sodium bicarbonate crystals of controlled size are produced by spraying an aqueous mixture of soda ash and sodium bicarbonate into an atmosphere containing CO2 in a carbonating zone;...
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3663163 |
REGENERATION OF CATION EXCHANGE RESINS AND RECOVERY OF SALTS
Cation exchange resins are regenerated by contact with selective chelating agents dissolved in an organic solvent. The chelating agents in turn are regenerated by acidification to precipitate a...
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3653819 |
PRODUCTION OF SODIUM CARBONATE
Process for producing sodium carbonate from the sodium amalgam of mercury-process salt electrolysis, wherein a caustic soda solution is reacted with carbon dioxide gas to produce sodium carbonate...
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3508863 |
PREPARATION OF SODIUM CARBONATE MONOHYDRATE FROM SODA SMELT SOLUTION
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3489509 |
PROCESS FOR RECOVERY OF CESIUM COMPOUNDS OF HIGH PURITY
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3845119 |
ORGANICS FROM TRONA BRINE BY CO2 TREATMENT
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3840641 |
RECOVERY OF BROMINE FROM TERE-AND ISOPHTHALIC ACID PROCESS RESIDUES
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3780160 |
CARBONATION PROCESS FOR THE MANUFACTURE OF SODIUM BICARBONATE
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3560329 |
PROCESS FOR LOW SULFIDE CHEMICAL RECOVERY
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3695831 |
ABSORPTIVE SODA ASH
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3692473 |
METHOD AND APPARATUS FOR REGENERATING SPENT CAUSTIC CRESYLATE SOLUTIONS
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3751560 |
MULTI-STAGE PROCESS FOR THE PREPARATION OF SODIUM BICARBONATE
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3455647 |
PROCESS FOR PRODUCING SODIUM SESQUICARBONATE AND SODA ASH FROM TRONA
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3380802 |
Carbonatizing roast of lithiumbearing ores
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3367735 |
Separation and recovery of sodium sulfate and sodium carbonate from admixtures thereof
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3310368 |
Production of zeolites and lithium salts
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3236589 |
Method of working up cellulose waste liquor containing sodium and sulfur
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3232700 |
Recovery of chemicals from smelts of spent soda-base liquors
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3203894 |
Method for the conversion of sea water into fresh water
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3175880 |
Chemical recovery by ion exclusion from neutral sulfite semichemical spent liquor
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3151934 |
Method of recovering lithium values
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