Matches 101 - 150 out of 362 < 1 2 3 4 5 6 7 8 >


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4585626 Process for making into useful products the uranium and rare earths contained in impure UF4 resulting from the extraction of uranium from phosphoric acid  
A process for making into useful products the uranium and rare earths contained in impure uranium tetrafluoride resulting from the recovery of uranium from phosphoric acid, comprising dissolving...
4579720 Chelation  
Hydroxymethane diphosphonic acid and alkali metal or ammonium salt of such acid are prepared. They are useful in detergent compositions and in sequestering and chelating polyvalent metals.
4578249 Process for recovery of uranium from wet process H3 PO4  
A process for stripping hexavalent uranium from an organic solution using phosphoric acid containing ferrous ion wherein the ferrous ion is provided by electrolytic reduction of ferric ion with...
4574072 Method for extracting lanthanides and actinides from acid solutions by modification of purex solvent  
A process for the recovery of actinide and lanthanide values from aqueous solutions with an extraction solution containing an organic extractant having the formula: ##STR1## where φ is phenyl, R1...
4545962 Recovery of uranium from a mixture of western uranium ore and phosphate rock  
An otherwise unusable western sandstone uranium ore is blended with uranium-containing phosphate rock. The mixture is then digested with sulfuric acid to produce a wet process phosphoric acid...
4544530 Separation process for the recovery of uranium from wet-process phosphoric acid  
A synergistic extractant combination consisting of di(2-ethylhexyl) phosphoric acid (D2EHPA) and dibutyl butyl phosphonate (DBBP) in kerosene is employed in a two-cycle separation process for the...
4528165 Separation of uranium from technetium in recovery of spent nuclear fuel  
A method for decontaminating uranium product from the Purex process comprises addition of hydrazine to the product uranyl nitrate stream from the Purex process, which contains hexavalent (UO22+)...
4526762 Recovery of vanadium from acidic solutions thereof  
Vanadium is recovered from acidic solutions by oxidizing the vanadium with Caro's acid to the pentavalent state and obtaining the oxidized vanadium by solvent extraction.
4511541 Process for the recovery of cadmium and other metals from solution  
A process for the selective recovery of cadmium, molybdenum, zinc, nickel and other metal values from wet process phosphoric acid and other acidic to slightly basic carrier solutions, wherein the...
4510122 Process for extracting uranium from phosphoric acids by means of alkylpyrophosphoric acids  
A process for extracting the uranium contained in phosphoric acid solutions by means of an extracting agent comprising an alkylpyrophosphoric acid, which comprises bringing into contact, in an...
4500493 Reductive stripping process for uranium recovery from organic extracts  
In the reductive stripping of uranium from an organic extractant in a uranium recovery process, the use of phosphoric acid having a molarity in the range of 8 to 10 increases the efficiency of the...
4490336 Process for stripping uranium from an alkyl pyrophosphoric acid  
A process is described for the recovery of tetravalent uranium from wet-process phosphoric acid utilizing an alkyl pyrophosphoric acid extractant or the like. After extracting the tetravalent...
4478804 Recovery process of uranium  
A recovery process of uranium comprising:(1) extracting uranium ions with an organic solvent containing one or more compounds selected from the group consisting of alkyl phosphoric acid,...
4476099 Method of recovering uranium  
Uranium is recovered from a carbonate leach solution containing a dissolved uranium salt and a monovalent ion. The pH of the leach solution is adjusted to about 5 to about 7.5, and preferably to...
4466944 Process for recovery of uranium from wet process H3 PO4  
Aqueous ammonium uranyl tricarbonate strip solution is purified by using activated carbon to remove ammonium di(2-ethylhexyl)phosphate impurity.
4464346 Extraction of uranium with triphosphonic esters  
Triphosphonic esters, each of the three phosphorus atoms of which is bound to a carbon atom of the same hydrocarbon group, having 2 or 4 free acid functions or two salt functions, may be used for...
4461746 Reduction of iron in a reductive stripping process for the recovery of uranium from wet process phosphoric acid  
A two stage reductive stripping process for recovering uranium from wet process phosphoric acid, wherein the ferrous ions required for the first-stage reductive strip are supplied by heating a...
4461748 Liquid-liquid extraction of rare earth/uranium/thorium values  
Rare earth, uranium and thorium values are separated and recovered from aqueous solutions of the chlorides thereof, said aqueous solutions having an acidity of less than 2 N and a concentration in...
4461747 Method for separating actinides from lanthanides in an acidic aqueous solution  
A method for the separation of actinides from lanthanides present in a trivalent state in an acidic aqueous solution.Said method consists in selectively extracting in an organic solvent the...
4460548 Extraction of uranium with diphosphonic compounds  
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...
4460549 Recovery of uranium from wet-process phosphoric acid  
The present invention relates to a process for recovering uranium from raffinate which is obtained by extracting phosphoric acid from a uranium-containing wet-process phosphoric acid with the aid...
4454097 Process of extracting both uranium and radium from uranium-containing ores  
Ferric chloride leaching at temperatures in the range 47°-74° C. is found to remove up to 97% of the uranium from ores occurring in the Elliot Lake area of Canada, but radium removal was found to...
4450143 Process for reducing the organic solvent losses in the treatment of a suspension resulting from the acid attack on an ore  
A process for treating a hydrometallurgical suspension resulting from the acid attack on an ore containing at least one metal element to be put to use, and non-attackable mineral materials, a...
4446114 Method of increasing the strip coefficient of the strip solution stream in a reductive stripping uranium recovery operation  
Increasing the strip coefficient of a strip solution stream in a reductive stripping uranium recovery process involving wet process phosphoric acid feed is accomplished by adding effective amounts...
4443413 Separation of uranium from technetium in recovery of spent nuclear fuel  
Uranium and technetium in the product stream of the Purex process for recovery of uranium in spent nuclear fuel are separated by (1) contacting the aqueous Purex product stream with hydrazine to...
4442071 Extraction of plutonium ions from aqueous sulfuric acid solutions with D2 EHPA or D2 EHPA/TOPO  
Method for separating plutonium ions from an aqueous solution containing sulfuric acid. The method comprises introducing into the aqueous solution 0.1 to 1.5 moles of nitrate ions per liter of...
4439405 Method for varying the mixing time and proportions in the contacting of substantially immiscible liquids  
An improved method and apparatus for producing a dispersion of substantially immiscible liquids which employs a conduit having an upstream section divided into first and second channels of...
4438077 Two stage selective oxidative leach method to separately recover uranium and refractory uranium-mineral complexes  
The present invention relates to a process for the recovery of uranium and other minerals from uranium ore where at least part of the uranium is present as refractory uranium-mineral complexes,...
4435367 Barren solvent wash by oxidized raffinate acid in the process of uranium extraction from phosphoric acid  
In a uranium recovery process, barren, organic solvent, which contains entrained, reduced iron containing phosphoric acid, exiting the stripper is contacted with oxidized raffinate acid, before...
4432945 Removing oxygen from a solvent extractant in an uranium recovery process  
An improvement in effecting uranium recovery from phosphoric acid solutions is provided by sparging dissolved oxygen contained in solutions and solvents used in a reductive stripping stage with an...
4432946 Uranium (VI) recovery process using acid organophosphorus extractant containing two or four alkoxyalkyl or aryloxyalkyl radicals  
Process for the recovery of uranium (VI) present in a phosphoric acid solution by contacting the latter with an organic solvent able to extract uranium, the organic solvent comprising a system of...
4430309 Acid wash of second cycle solvent in the recovery of uranium from phosphate rock  
Entrainment of contaminated water in the organic phase and poor phase disengagement is prevented in the second cycle scrubber, in a two cycle uranium recovery process, by washing the organic...
4427640 Sequential process for extraction and recovery of vanadium and uranium from wet process acids  
A process for preferentially extracting and recovering vanadium and uranium from wet process acids. The wet process acid first is contacted with a neutral organo-phosphorus compound to extract the...
4425306 Method for the recovery of uranium from wet-process phosphoric acid  
A method of recovering uranium from phosphoric acid solutions containing same comprises extracting the uranium from the phosphoric acid with an organic solution of an alkylphenyl pyrophosphate.
4424195 Recovery of organic extractant from secondary emulsions formed in the extraction of uranium from wet-process phosphoric acid  
Uranium in wet-process phosphoric acid is extracted with an organic extractant. The pregnant extractant is then centrifuged to separate contaminants from the extractant. Secondary emulsions...
4407780 Reductive stripping of uranium values from wet-process phosphoric acid  
Uranium values are recovered from a wet-process phosphoric acid solution by extracting said solution with a first organic extractant, reductively stripping the resulting first organic phase of its...
4407725 Regeneration of activated carbon  
Spent activated carbon previously used to remove humate-type organic impurities from an aqueous inorganic acid solution is regenerated by a specific chemical regeneration process. According to...
4406865 Metal extraction by solid-liquid agglomerates  
A modified liquid-liquid extraction system is disclosed in which a particulate solid and a liquid, both insoluble in a second liquid, are mixed to form agglomerate particles which efficiently...
4404130 Process for the plutonium decontamination of an organic solvent  
Process for the plutonium decontamination of an organic solvent comprising adding to the said organic solvent a reducing agent which is a dialkyl dithiophosphoric acid and which is soluble in the...
4402917 Extraction of uranium from phosphoric acid using supported extractants  
Uranium is extracted from phosphoric acid with organophosphorus extractants supported or impregnated on polymeric resins, and especially macroreticular resins. Suitable extractants include mono...
4402920 Humic flotation of wet process phosphoric acid as a pretreatment step in the recovery of uranium  
An acidic solution containing metal values and also containing humic acid impurities, is purified by: (1) forming a gas in the acid solution, (2) adding high molecular weight anionic organic...
4402919 Process for the regeneration of mineral acids used to solubilize phosphate ores  
A process for solubilizing uranium and other values in an ore containing the same together with aluminum and phosphorus and effecting regeneration of a mineral acid employed to solubilize the ore....
4397820 Method to maintain a high Fe+2 /Fe+3 ratio in the stripping system for the recovery of uranium from wet process phosphoric acid  
A process to maintain a high iron +2/iron +3 concentration in the reductive stripping system for recovering uranium from wet-process phosphoric acid, comprises contacting partially oxidized strip...
4396556 Process of preparing organophosphorus compounds by phase transfer catalysis  
Novel organic tertiary phoshine oxides and organic phoshonic acid esters, for example, bidentate organophosphorus actinide extractants, such as the carbamoylmethylphosphonates (CMP's) can be...
4394269 Method for cleaning solution used in nuclear fuel reprocessing  
A nuclear fuel processing solution containing (1) hydrocarbon diluent, (2) tri-n-butyl phosphate or tri-2-ethylhexyl phosphate, and (3) monobutyl phosphate, dibutyl phosphate, mono-2-ethylhexyl...
4394360 Process for reducing iron in phosphoric acid solution  
Iron contained in phosphoric acid solution is reduced from the trivalent to the bivalent oxidation stage. To this end, red phosphorus is used as the reductant and the reduction is effected in the...
4385037 Concentrated sulphuric acid treatment of an alkylphenyl acid phosphate extractant  
Uranium in wet-process phosphoric acid in the tetravalent state is extracted with an alkylphenyl acid phosphate extractant comprising a mixture of mono- and di(alkylphenyl) esters of...
4385036 Process of obtaining uranium and uranium compounds from phosphoric acid  
The invention concerns a method for the liquid/liquid extraction of uranium from phosphoric acid with the aid of alkylamine polyphosphate and/or alkylamine metaphosphate compounds, dissolved in...
4382066 Uranium extraction process  
Uranium is extracted from wet process phosphoric acid by extraction with a mixture of a diorganophosphate and a neutral phosphorus compound, which is preferably a triorgano phosphine oxide, in the...
4374805 Reductants for reducing metals in acid media  
Metals such as iron, uranium, vanadium, molybdenum and rare earths are reduced to lower oxidation states in various acid media using silicon metal or an iron-silicon alloy. In particular, ferric...

Matches 101 - 150 out of 362 < 1 2 3 4 5 6 7 8 >