Matches 151 - 200 out of 362 < 1 2 3 4 5 6 7 8 >


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4374806 Raffinate wash of second cycle solvent in the recovery of uranium from phosphate rock  
Precipitation of Fe3 HN4 H8 (PO4)6 is prevented in the second cycle extractor, in a two cycle uranium recovery process, by washing ammonia laden organic solvent stream, from the second cycle...
4371504 Extractant and process for extracting uranium wet-process phosphoric acid  
Uranium in wet-process phosphoric acid in the tetravalent state is extracted with a mixture of mono- and di-(alkylphenyl) esters of orthophosphoric acid containing a phenol modifier such as...
4371505 Process for the recovery of uranium contained in an impure phosphoric acid  
The invention concerns a process for the recovery of the uranium contained in an impure phosphoric acid. The impure acid is treated with an organic phase capable of extracting U (VI), and the...
4367197 Method for the control of excessive corrosion in phosphoric acid circuits  
Methods for control of excessive corrosion in wet process phosphoric circuits are effected by oxidation of reduced ion species in the acid with maintenance of EMF value of the acid above about 190...
4363788 Separation of uranium and molybdenum using a solvent  
A process for separating by means of an organic agent the uranium and the molybdenum contained in an aqueous liquor originating from a sulphuric attack of an urano-molybdeniferous ore which...
4356153 Uranium recovery process  
Process for the recovery of the uranium present in a phosphoric acid solution by bringing the said solution into contact with an organic solvent suitable for extracting the uranium, wherein the...
4356154 Uranium extraction coefficient control in the process of uranium extraction from phosphoric acid  
Controlling the uranium extraction coefficient in uranium extraction processes involving wet process phosphoric acid feed is accomplished by monitoring the oxidation potential of the raffinate...
4353877 Extraction process  
A process is described for extracting phosphoric acid and metal values, such as uranium, from phosphate rock using hydrochloric acid and independently extracting the phosphoric acid and metal...
4341743 Simultaneous oxidation and extraction of vanadium from wet-process phosphoric acid  
The oxidation and extraction steps in the vanadium stripping process (e.g., the DEPA-TOPO or DOPPA-TOPO process) are carried out simultaneously for recovering vanadium from wet-process phosphoric...
4341602 Extraction of uranium using electrolytic oxidization and reduction in bath compartments of a single cell  
The invention relates to a process for the recovery and the concentration of uranium (VI) contained in an organic phase. The organic phase is treated continuously in a contact zone with an aqueous...
4339416 Uranium recovery process  
Process for the recovery of the uranium present in a phosphoric acid solution by bringing the said solution into contact with an organic solvent suitable for extracting the uranium, wherein the...
4337225 Regeneration of liquid membrane without breaking emulsion  
A process for removing a species from a fluid which comprises (a) contacting said fluid with an emulsion, said emulsion having an external phase and an internal phase, said external phase being...
4334999 Process for the extraction of metal ions  
A process for extracting metal ions from a water insoluble metal base or salt dispersed in an aqueous solution using liquid ion exchange is described. The liquid ion exchange extractant is an...
4332776 Extractant solvent restoration in the process for recovery of uranium from phosphoric acid  
A process to restore solvent after the stripping step in recovering uranium from phosphoric acid, comprises passing stripped, water-immiscible organic extraction solvent, containing contaminants...
4327061 Method of stabilizing wet process phosphoric acid for solvent extraction  
A method of stabilizing wet process phosphoric acid containing acid soluble impurities preparatory to solvent extraction for the recovery of valuable minerals. The acid is introduced into a vessel...
4325918 Deprotonation of an alkylphenyl acid phosphate extractant  
Uranium in wet-process phosphoric acid in the tetravalent state is extracted with an alkylphenyl acid phosphate extractant. The uranium in the pregnant extractant is then oxidized to the...
4324767 Separation process utilizing microcapsules  
The instant invention relates to a process for removing a species from a fluid which comprises (a) contacting said fluid with a hollow microcapsule, said microcapsule having a wall surrounding an...
4323540 Reduction of iron precipitation in uranium extraction process  
The precipitation of an iron complex is reduced during the stripping of uranium with ferrous ion, where the uranium was oxidized with nitric acid then extracted with an organic solvent. The...
4318893 Process for the separation of americium from curium contained in an aqueous nitric solution  
Process for the separation of americium from curium contained in an aqueous nitric solution, wherein the initial solution undergoes oxidation at ambient temperature in the presence of phosphoric...
4316877 Extraction of uranium values from phosphoric acid  
Aqueous phosphoric acid solutions containing uranium values are contacted with an organic solution of a mixture of organophosphorus compounds produced from a carboxylic acid and PCl3 in the...
4311675 Maintaining reductive strip efficiency in uranium recovery processes  
Wet process phosphoric acid is oxidized with nitric acid so that uranium values therein are in the +6 state. The organic extractant which contacts the acid extracts the +6 uranium and nitrate...
4311676 Process for the recovery of uranium contained in phosphated compounds  
This present invention provides a process of recovering uranium from a uranium-containing acid lixiviation solution comprising extracting the lixiviation solution with an organic extractant...
4305912 Process for recovering uranium from wet process phosphoric acid (III)  
Organic substances are removed from a highly ionic medium by contacting the medium with a substantially hydrophobic polystyrene type resin. This process is especially useful in the...
4302427 Recovery of uranium from wet-process phosphoric acid  
Uranium values are recovered as uranyl peroxide from wet process phosphoric acid by a solvent extraction-precipitation process. The preferred form of this process comprises a first solvent...
4299724 Process for the recovery of liquid extractant and acid from emulsions formed during metal recovery from acid solutions  
A method of recovering liquid from an emulsion formed in a liquid-liquid contacting process, where the emulsion comprises at least one of the liquids entrapped by water-permeable membranes,...
4293529 Process for recovering uranium from wet-process phosphoric acid using alkyl pyrophosphoric acid extractants  
A process is described for the recovery of uranium values from phosphoric acid utilizing an alkyl pyrophosphoric acid (APPA) primary extractant. After extracting the uranium from the phosphoric...
4292278 Purification of wet process phosphoric acid as a pretreatment step in the recovery of uranium  
A metal containing acidic solution, also containing humic acid impurities and contaminants, is purified by contacting the acidic solution with a scrubbing agent consisting essentially of a metal...
4290882 Electrostatic separation of impurities phase from liquid-liquid extraction  
Electrostatic separation of aqueous and particulate matter from a primarily organic impurities phase which forms at the organic/aqueous interface in a liquid-liquid extraction process.
4289609 Process for removing solid organic materials and other impurities from wet-process phosphoric acid  
The solid organic materials contained in wet-process phosphoric acid are removed by froth flotation in a flotation cell in which the solid organic materials overflow with the foam from the top of...
4288412 Post treatment method for the recovery of uranium from wet-process phosphoric acid  
In the process of uranium recovery from wet-process phosphoric acid, post treatment of the raffinate phosphoric acid is very important to prevent damage to the rubber linings of the acid...
4287071 Simultaneous extraction of more than one ion by liquid membrane process  
A liquid membrane process for removing ions from solution which comprises contacting a solution containing a first ion and a second ion with an emulsion, said emulsion comprising an external phase...
4284606 Extraction  
A process as described for extracting at least two desired constituents from a mineral using a liquid reagent which produces the constituents, or compounds thereof, in separable form and...
4284614 Process for production of high purity phosphoric acid from high alumina phosphate pebble rock  
High quality phosphoric acid is produced from phosphate rock and high alumina pebble which is a byproduct of phosphate rock mining operations. The rock or pebble with or without comminution is...
4282112 Ruthenium recovery process by solvent extraction  
Process for the recovery of the ruthenium present in an aqueous nitric solution, wherein the ruthenium is extracted in an organic solvent by contacting the nitric solution with an organic phase...
4278559 Method for processing spent nuclear reactor fuel  
A method and apparatus for processing spent nuclear reactor fuel wherein plutonium is continuously contaminated with radioactive fission products and diluted with uranium. Plutonium of sufficient...
4278640 Method for solvent extraction of metallic mineral values from acidic solutions  
Solvent extraction of metallic mineral values from aqueous acidic solutions is improved by introducing a fine dispersion of air bubbles into the acid-extractant mixture to cause solid material...
4277454 Methods for the control of excessive corrosion in phosphoric acid circuits  
Methods for control of excessive corrosion in wet process phosphoric circuits are effected by oxidation of reduced ion species in the acid with maintenance of EMF value of the acid above about 190...
4275037 Stripping metals from organic solvent with aqueous solution of polymeric phosphates  
Certain metals, and especially uranium, are recovered from an organic solvent by stripping with an aqueous solution containing polymeric phosphates under conditions in which the polymeric...
4265861 Method of reducing radioactive waste and of recovering uranium from it  
A method is described for reducing the volume of radioactive waste produced during the solution mining of uranium and for recovering uranium from it. The recovery leach, which contains uranium in...
4258015 Recovering uranium from wet process phosphoric acid with alkylphenyl phosphates  
An improvement in the process for the recovery of uranium from a phosphoric acid solution derived from the acidification of uraniferous phosphate ores including the steps of reducing the uranium...
4258013 Uranium recovery from wet process phosphoric acid  
Improvement in the process for recovering uranium from wet-process phosphoric acid solution derived from the acidulation of uraniferous phosphate ores by the use of two ion exchange liquid-liquid...
4255396 Process for separating molybdenum values from tungsten values  
The efficiency of an extraction process using a dialkyl phosphoric acid as an active extractant for separating extractable soluble metallic values from an aqueous solution is improved by the...
4255392 Method of separating iron from uranium  
In uranium recovery by solvent extraction processes, uranium is separated from iron in an organic extract by stripping the extract with a dilute aqueous solution containing carbonate ions,...
4252777 Recovery of aluminum and other metal values from fly ash  
The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid...
4248703 Emulsion removal from acidic solution-solvent interfaces  
An emulsion, formed at the interface of an acidic solution and a solvent, is removed by passing at least one continuous belt through the emulsion by floating action, where portions of the emulsion...
4243637 Uranium recovery from pre-treated phosphoric acid  
Impure phosphoric acid containing uranium values is pretreated with a water immiscible organic sulfonic acid, preferably in conjunction with a water immiscible organic acid phosphate compound, for...
4241027 Reductive stripping process for the recovery of either or both uranium and vanadium  
A process for the reductive stripping of an organic phase containing either or both uranium and vanadium. Said process comprising contacting said organic phase containing either or both uranium in...
4238457 Process for the recovery of uranium from wet-process phosphoric acid  
In a process for the recovery of uranium from a wet-process phosphoric acid, comprising treating in an extraction step the preliminarily oxidized acid first with an organic solvent consisting...
4233278 Process for purifying crude phosphoric acid  
Aqueous phosphoric acid, e.g., a slurry of the acid produced by the "wet" process, is contacted with steam under organic volatile-removing conditions to remove volatile organic material. A "wet...
4229421 Purification of plutonium  
During the reprocessing of irradiated nuclear fuel by solvent extraction techniques a primary separation to give a uranium containing product stream and a plutonium containing product stream...

Matches 151 - 200 out of 362 < 1 2 3 4 5 6 7 8 >