Matches 51 - 100 out of 362 < 1 2 3 4 5 6 7 8 >


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5500192 Method of separating neptunium and plutonium  
In a method of separating neptunium and plutonium, a nitric acid solution containing a mixture of neptunium and plutonium is oxidized by irradiation of ultraviolet light in the presence of a...
5468456 Batch extracting process using magneticparticle held solvents  
A process for selectively removing metal values which may include catalytic values from a mixture containing same, wherein a magnetic particle is contacted with a liquid solvent which selectively...
5463177 Solvent extraction process  
The extraction process includes supplying solvent under gas pressure for introduction of the solvent adjacent the bottom of a vessel containing the sample. The vessel lies in a water bath and...
5443731 Process for extracting technetium from alkaline solutions  
A process for extracting technetium values from an aqueous alkaline solution containing at least one alkali metal hydroxide and at least one alkali metal nitrate, the at least one alkali metal...
5437847 Method of separating and recovering ruthenium from high-level radioactive liquid waste  
A method of recovering volatile ruthenium, which is separated and formed by constant potential electrolysis from high-level radioactive liquid waste discharged from the reprocessing step of spent...
5409678 Separations of actinides, lanthanides and other metals  
An organic extracting solution comprised of a bis(acylpyrazolone or a substituted bis(acylpyrazolone) and an extraction method useful for separating certain elements of the actinide series of the...
5332531 Extracting metal ions with diphosphonic acid, or derivative thereof  
Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and...
5276251 Process for treating organic phosphoric acids  
A process for treating organic phosphates, comprising (a) mixing a waste organic solvent mainly composed of an organic phosphate with an additive mainly composed of at least one of metal salts of...
5246901 Polysulfonic acids  
This invention provides novel compositions comprising aryl phosphonic or phosphinic acids substituted with more than one sulfo radical. These novel compounds may be reacted with tetravalent metal...
5188736 Process for the separation and recovery of extractant from spent solvent  
A new chemical separation process was developed in this invention using 2-methoxyethanol or methyl collosolve (MCS) and ethylene glycol (EG) as separation agents, to separate the valuable...
5169609 Combined transuranic-strontium extraction process  
The transuranic (TRU) elements neptunium, plutonium and americium can be separated together with strontium from nitric acid waste solutions in a single process. An extractant solution of a crown...
5156824 Application of diphosphonic derivatives to cation exchange, new diphosphonic derivatives and production process therefor  
New diphosphonic derivatives are capable of extracting the uranium in phosphoric acid with a P205 content ranging from 10 to 50 per unit.The new diphosphonic derivatives have the following...
5057289 Process for the separation of uranium from a radioactive feed solution containing technetium  
A process for the separation of uranium and plutonium as well as fission ducts including technetium from a nitric acid feed solution (fuel solution) in which said solution is treated with an...
5017344 Process for the separation of iron from an organic solution containing uranium  
A process for separating iron +3 from uranium +6 is an organic solution of a neutral phosphine oxide and an acid organophosphorus compound. The uranium-containing organic solution is contacted...
5000927 Method of regulating a purex solvent extraction process  
The "Purex" solvent extraction and separation process for recovering uranium from scrap material or spent fuel containing gadolinia is modified by treating uranium containing scrap or spent fuel...
4983300 Process for the reextraction in aqueous solution of the plutonium present in an organic solvent, more particularly usable for splitting uranium and plutonium  
The invention relates to a process for the reextraction in aqueous solution of the plutonium present in an organic solvent, more particularly usable for uranium-plutonium separation.According to...
4981616 Spent fuel treatment method  
In a method for recovering plutonium and uranium from spent nuclear fuel by solvent extraction having solvent consisting of tri-n-butyl phosphate, dibutyl phosphate and n-dodecane, the improvement...
4950425 Method of decomposing alkyl phosphate  
Alkyl phosphates, undiluted or dissolved in hydrophobic solvents can be destroyed in situ by reaction with hydrogen peroxide in the presence of certain transition metal catalyst systems. The...
4943318 Removal of thorium from raffinate  
Thorium is removed from raffinate effluent by pre-washing with odorless kerosene to remove organic contaminants, followed by solvent extraction counter-currently with tri-n-octylphosphine oxide in...
4941998 Method of washing a solvent in the reprocessing of irradiated nuclear fuels  
The invention is directed to a method of washing a solvent in the reprocessing of irradiated nuclear fuel. The solvent is washed with an aqueous solution in a mixer-settler having at least one...
4922012 Compositions of matter comprising dialkyl-(N,N-dialkylcarbamoylmethyl) phosphine oxides  
Novel organic tertiary phosphine oxides for example, bidentate organophosphorus actinide extractants, such as the carbamoylmethylphosphine oxides (CMPO's) are disclosed, such compounds can be...
4891163 Method of processing nuclear fuel scraps  
High-purity uranium can be effectively recovered from gadolinium-containing nuclear fuel scraps by dissolving the scraps in a mineral acid, extracting uranium from the resulting solution with a...
4871478 Method of improving the criticality safety in a liquid-liquid extraction process for spent nuclear fuel or breeder reactor materials  
A process for the extraction of uranium and plutonium from spent nuclear fuels or breeder reactor materials. The spent nuclear fuels or breeder reactor materials are dissolved in nitric acid to...
4867951 Separation of actinides from lanthanides  
An organic extracting solution and an extraction method useful for separating elements of the actinide series of the periodic table from elements of the lanthanide series, where both are in...
4836956 Extraction of polyvalent metals with organodiphosphonic acids  
Polyvalent cations (e.g., U(IV), Fe(III) can be extracted from aqueous solution using novel organophosphorus compounds of the formulas: ##STR1## wherein R1 and R2 are the same or different and are...
4834787 Phosphate rock utilization  
A process providing solubilization of phosphate rock by contacting the rock with sulfurous acid in the presence of an oxidizing agent selected from the group consisting of hydrogen peroxide and...
4818503 Extraction process for removing and recovering metals from aqueous solutions  
The purpose of the process is to remove and to recover metals from their aqueous solution by the extraction process. As extractant is used monoesters of phosphonic acid wherein the alkyl group is...
4818774 Organophosphorus compounds  
Polyvalent cations (e.g., U(IV), Fe(III) can be extracted from aqueous solution using novel organophosphorus compounds of the formulas: ##STR1## wherein R1 and R2 are the same or different and are...
4816241 Gaseous reduction of phosphoric acid  
A process for reducing the valence state of ferrous and other ions present in phosphoric acid by heating the acid in the presence of a pressurized reducing gas, preferably hydrogen. The...
4787979 Liquid-liquid extraction process  
A liquid-liquid two-phase extraction process in which a feed solution is introduced into an intermediate stage of a multistage extraction apparatus. The solution is water and one or more valuable...
4778663 Uranium recovery from wet process phosphoric acid unsymmetrical phosphine oxides  
This invention relates to a process for the recovery of uranium from wet process phosphoric acid. More particularly, it concerns the use of a combination of a dialkyl phosphoric acid and a mixture...
4764352 Process for preventing the extraction of technetium and/or rhenium, particularly during the extraction of uranium and/or plutonium by an organic solvent  
Process for preventing the extraction of technetium and/or rhenium, particularly during the extraction of uranium and/or plutonium by an organic solvent.This process permitting the extraction of a...
4759913 Recovery of liquid phases from three phase emulsions formed in solvent extraction processes  
A process for the recovery of an organic phase and an aqueous phase from three phase emulsions such as those formed during the extraction of uranium from wet phosphoric acid is described. Such...
4758411 Process for the recovery in the form of tetravalent fluoride of uranium extracted from phosphate-bearing solutions with the addition of metalic ions  
A process for the recovery of uranium which has been extracted from phosphate-bearing solutions by means of an organic solvent and which is re-extracted from said solvent by means of hydrofluoric...
4744960 Process for the separation of rare earths and uranium of a UF4 concentrate and for putting them into useful form  
The present invention relates to a proces for separating rare earths and uranium from a UF4 concentrate and for placing them into useful form, comprising attacking the UF4 concentrate with...
4741810 Process for reductive plutonium stripping from an organic reprocessing solution into an aqueous, nitric acid solution by use of an electrolytic current  
A process for reductive plutonium stripping from an organic reprocessing solution into an aqueous, nitric solution by use of an electrolytic current, in which the aqueous solution is free of...
4701261 Process for the separation of metals from aqueous media  
Paramagnetic metals are separated from aqueous media containing them in low concentration by first fixing the metals on bacterial yeast or other cells so as to render the cells magnetic, and then...
4683124 Actinide recovery process  
Process for the removal of plutonium polymer and ionic actinides from aqueous solutions by absorption onto a solid extractant loaded on a solid inert support such as polystyrenedivinylbenzene. The...
4659551 Process for separation of neptunium from an organic phase in the recovery of irradiated fuel and/or fertile materials  
A process for the separation of neptunium from an organic phase, which is developed in the recovery of irradiated nuclear fuel and/or fertile material. The organic phase contains uranium-,...
4656012 Process for the recovery of uranium from phosphoric acid solutions  
The invention concerns the recovery of heavy metals from concentrated solutions.The process comprises complexing the metals with an organophosphorous complexing agent and recovering the metallic...
4656011 Process of treating nuclear fuel  
In the process for treating irradiated nuclear fuel to effect separation of uranium plutonium other higher actinides, and fission products, in which nitric acid treatment, followed by solvent...
4652432 Process for recovering uranium using an alkyl pyrophosphoric acid and alkaline stripping solution  
A process is described for the recovery or uranium from wet-process phosphoric acid utilizing an alkyl pyrophosphoric extractant. The extractant also contains a modifier for retaining the alkyl...
4649029 Processes for extraction of uranium and radium from uranium-containing ores using ferric nitrate  
Ferric nitrate leaching at 75° C. is found to remove up to 97% of the uranium and 93% of the radium from ores occurring in the Elliot Lake area of Canada, after an initial flotation-separation of...
4643882 Process for recovery by a solvent of the uranium present in phosphoric acid  
A process for the recovery of the uranium present in phosphoric acid produced by a wet process in (A) by means of a suitable solvent (L9), which is carried out after separation of the gypsum in...
4636369 Essentially complete recovery of uranium, yttrium, thorium and rare earth values from phosphate rock during wet-process production of phosphoric acid therefrom  
The uranium, yttrium, thorium and rare earth values contained in a phosphate rock are essentially totally recovered therefrom by, during the wet-process preparation of phosphoric acid from said...
4634580 Process for the purification of wet-process phosphoric acid by removal of cadmium  
A process for the removal of cadmium contained in wet-process phosphoric acid by flotation by means of a cadmium-collector anionic surface active agent and an injected gas in the presence of other...
4631142 Diphosphonic extractants  
New diphosphonic acid diesters in which the two phosphorus atoms are bound by a hydrocarbon group while each of the two acid functions of the diphosphonate is esterified by a radical having at...
4595571 Liquid-liquid extractor and method for using same  
An apparatus is provided that is useful for effecting liquid-liquid extraction by contacting a first liquid medium with a substantially immiscible heavier second liquid medium. Each mixer-settler...
4595529 Solvent wash solution  
Process for removing diluent degradation products from a solvent extraction solution, which has been used to recover uranium and plutonium from spent nuclear fuel. A wash solution and the solvent...
4587107 Extractant compositions containing dialkyl and diaryl phosphonate derivatives and methods for the use thereof  
The invention provides an extractant composition comprising as an extraction agent the reaction product of jojoba oil and dialkyl or diaryl phosphite. The invention also provides a method for...

Matches 51 - 100 out of 362 < 1 2 3 4 5 6 7 8 >