|
Match
|
Document |
Document Title |
|
|
4427641 |
Method of recovering uranium from wet process phosphoric acid with enhanced content of uranium
In preparing wet process phosphoric acid by decomposing a phosphate rock containing uranium with sulfuric acid and phosphoric acid on condition that hemihydrate gypsum is formed in an acid solution...
|
|
|
4425307 |
Hydrogen peroxide in sulfuric acid extraction of uranium ores
Uranium can be extracted from its ores at a pH of 2.5 to 5.5 using sulfuric acid, hydrogen peroxide, trace of iron and a sulfate. The extraction process is applicable to both tank leaching of...
|
|
|
4424196 |
Phosphohemihydrate process for purification of gypsum
A wet process for producing phosphoric acid and phosphohemihydrate by acidulation of phosphate rock. A strong phosphoric acid is obtained with concomitant production of an improved calcium sulfate...
|
|
|
4414183 |
Phenolic chelate resin, process for producing the same, and method of recovering heavy metal ions with the same
The phenolic chelate resin has a chelate-forming group wherein part or all of the hydrogen atoms in a primary and/or secondary alkylamino group introduced in a phenol nucleus are replaced by a...
|
|
|
4412861 |
Method for the recovery of uranium values from uranium tetrafluoride
The invention is a novel method for the recovery of uranium from dry, particulate uranium tetrafluoride. In one aspect, the invention comprises reacting particulate uranium tetrafluoride and...
|
|
|
4412860 |
Process for recovering niobium from uranium-niobium alloys
Niobium is recovered from scrap uranium-niobium alloy by melting the scrap with tin, solidifying the billet thus formed, heating the billet to combine niobium with tin therein, placing the billet...
|
|
|
4411873 |
In-line regeneration of polythionate poisoned ion exchange resins
A process is described for minimizing accumulation of undesirable polythionates on an ion exchange resin used to recover uranium values from a leachate from an in situ mining operation by adding...
|
|
|
4406864 |
Recovery of uranium from material containing iron, arsenic and siliceous matter
A process for the recovery of uranium values from uranium-containing material which also contains iron, arsenic and siliceous matter, includes leaching the uranium-containing material in aqueous...
|
|
|
4405566 |
Removal of uranium from sulphate solutions containing molybdenum
A process for recovering uranium values from a sulphate solution containing dissolved uranium and molybdenum and with a pH not exceeding about 5.5, includes reacting the solution with ammonia at a...
|
|
|
4402918 |
Reclamation process for water-borne uranium
A process for treating water containing chemicals comprising ammonium nitrate, fluorides, hydrogen peroxide and uranium compounds, wherein valuable and/or hazardous components of the...
|
|
|
4399110 |
Process for reducing the radioactivity of calcium sulfate prepared from phosphate rock
The level of radioactivity in gypsum produced from phosphate rock can be reduced by adding to the slurry of acid and phosphate rock in the conventional process for producing phosphoric acid a...
|
|
|
4397819 |
Rejuvenation of the anion exchanger used for uranium recovery
A process is described for restoring and maintaining the total ion exchange capacity of the resin used for uranium recovery in in situ uranium leaching. The used resin of lowered exchange capacity...
|
|
|
4391782 |
In situ uranium leaching using high pressure CO.sub.2 /O.sub.2 system to overcome chloride ion inhibition
A process is described for improving yield and leaching rates of mineral values in uranium-bearing formations associated with high brine aquifers by using high pressure CO 2 /oxidant in the...
|
|
|
4376098 |
Two-stage uranium in situ leaching process
A two-stage in situ uranium leaching process is described wherein H 2 SO 4 /oxidant is used as the principal leaching solution. Prior to leaching, the formation is treated with a dilute solution...
|
|
|
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...
|
|
|
4361541 |
Method for extraction of uranium from ores
A method for continuously extracting uranium from ores comprises the steps of forming a slurry of ore in a leaching solution; heating the slurry while pumping it through a tube reactor at high...
|
|
|
4360500 |
Mineral leaching
Uranium ore is crushed and formed into a slurry. The slurry is pumped into a leaching tank and classified by a sparge tube projecting water at teeter velocity at the bottom of the ore bed....
|
|
|
4344923 |
In-situ leaching
The present invention relates to in-situ leaching of uranium, particularly employing an acidic leach liquor containing an oxidant, and especially in respect of ores containing significant amounts...
|
|
|
4340252 |
Process for the in-situ leaching of uranium
Process for the in-situ leaching of uranium from a subterranean ore deposit comprising introducing into the deposit an aqueous lixiviant formulated from a dilute sulfuric acid solution which also...
|
|
|
4337979 |
Process for the in-situ leaching of uranium
Process for the in-situ leaching of uranium from a subterranean ore deposit employing a lixiviant containing an oxidizing agent, sulfuric acid, and carbon dioxide. Prior to the injection of the...
|
|
|
4333912 |
Method for dissolving plutonium-containing nuclear fuels
A method of accelerating and increasing the solubility in nitric acid of plutonium dioxide and uranium/plutonium oxide fuels and insoluble residues from such nitric acid dissolution, includes the...
|
|
|
4311677 |
Process for producing phosphoric acid
Phosphoric acid and gypsum are produced from phosphate rock by digesting same with sulfuric acid to produce a high concentration of phosphoric acid and calcium sulfate hemihydrate. The solubilized...
|
|
|
4301123 |
Methods of processing uraniferous ores
Refractory uranium is crushed and impregnated with a concentrated aqueous solution of sulphuric acid to provide a mixture which retains a solid phase consistency. The impregnated mixture is...
|
|
|
4294805 |
Method of leaching the contents of a can
A method of leaching a material from a cavity having a closed or a partially closed top. The method consists of subjecting the liquid to a number of pressure cycles, each pressure cycle involving a...
|
|
|
4293530 |
Recovery of gold and uranium from calcines
The invention concerns the recovery of non-ferrous metals, such as gold, uranium or the like from iron oxide containing calcines which have the non-ferrous metal present in solid solution and/or...
|
|
|
4278292 |
Clay stabilization in uranium leaching and restoration
Process for the stabilization of formation clays by the use of aluminum in the in-situ leaching of uranium or the restoration of contaminated formations. The aluminum is added to a lixiviant having...
|
|
|
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 phosphate...
|
|
|
4272490 |
Hydrometallurgical process for the treatment of ores
A process for the recovery of uranium values from uranium-bearing material by sulphuric acid leaching when the material also contains siliceous matter which is at least partly soluble in sulphuric...
|
|
|
4272491 |
Ferric leaching of uranium values from lignite
There is disclosed a process for extracting uranium values from a uranium-containing carbonaceous ore such as lignite. This process includes the step of treating the ore with an aqueous leach...
|
|
|
4269808 |
Method of simultaneously subjecting ores to pulverization and leaching or extraction
There is provided a method for simultaneously carrying out pulverization of ores and their leaching or extraction within a vertical abrasion mill.
|
|
|
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 in...
|
|
|
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...
|
|
|
4247495 |
Method of producing PuO.sub.2 /UO.sub.2 /-nuclear fuels
Production of UO 2 nuclear fuel pellets containing PuO 2 in set amounts, which pellets are soluble in nitric acid and suitable for reprocessing without the aid of a special additive. Uranium...
|
|
|
4233272 |
Process for selective separation of uranium from solutions by means of an ion exchanger
A process for selectively removing tetravalent and/or hexavalent uranium ions from a solution by using a chelate-forming cation exchanger. The solution may be prepared by contacting uranium bearing...
|
|
|
4230672 |
Apparatus for recovering nuclear fuel from scrap material
Process for recovering compounds of enriched nuclear fuel from scrap materials is disclosed. The process yields an acid solution with the nuclear fuel dissolved therein. Except for spent filter...
|
|
|
4229422 |
Metal extraction
In a process according to the present invention uranium is extracted into solution from its ore by leaching with an aqueous solution containing peroxomonosulphuric acid, the peroxoacid oxidizing...
|
|
|
4225563 |
Process and apparatus for continuous leaching of ores
A process for the continuous leaching of ores and an apparatus for practicing this continuous leaching process are disclosed. According to this process, a plurality of unit layers composed of a...
|
|
|
4223948 |
Process for the reduction of competitive oxidant consuming reactions in the solution mining of a mineral
The present invention relates to an improved method for the solution mining of a mineral from a subterranean formation. More specifically, the invention relates to an improved method which enhances...
|
|
|
4214791 |
Method for improving solution flow in solution mining of a mineral
The present invention relates to an improved method for the solution mining of a mineral from a subterranean formation. More specifically, the invention relates to an improved method which enhances...
|
|
|
4201690 |
Processing of irradiated nuclear fuel
Irradiated nuclear fuel is dissolved in nitric acid under a carbon dioxide atmosphere which is treated to remove iodine, krypton and xenon and recycled.
|
|
|
4200337 |
Catalyses of uranium oxidation
The oxidation of uranium is catalyzed with water-soluble copper or zinc chelates. An aqueous solution is prepared containing carbonate or bicarbonate ion, an oxidizer such as hydrogen peroxide or...
|
|
|
4177241 |
Apparatus and process for recovering nuclear fuel from scrap material
A process for recovering compounds of enriched nuclear fuel from scrap materials is disclosed. The process yields an acid solution with the nuclear fuel dissolved therein. Except for spent filter...
|
|
|
4175108 |
Process for extracting uranium from ores
A process for the extraction of uranium from ores which is an improvement in the known "dry attack" treatment of uranium ores to an economical yet high rate of extraction. The process concerns...
|
|
|
4159308 |
Mineral treatment
The addition of a normally insoluble fluoride to a reaction being a chemical treatment process provides a surprisingly improved rate is dissolution in many cases. Specifically, where the fluoride...
|
|
|
4134960 |
Method for dissolving plutonium oxide with HI and separating plutonium
PuO 2 -containing solids, particularly residues from incomplete HNO 3 dissolution of irradiated nuclear fuels, are dissolved in aqueous HI. The resulting solution is evaporated to dryness and the...
|
|
|
4131639 |
Sulfuric acid extraction of uranium from its ores
A method of extracting uranium from its ores, by mixing ground ore with sulphuric acid to give a moist ore containing a sulphuric acid concentration of less than 4N, without forming a continuous...
|
|
|
4129334 |
Method for locating the remaining recoverable mineral reserves during solution mining
The present invention relates to a method for the solution mining of a mineral from a subterranean formation. More specifically, the invention relates to a method which enhances significantly the...
|
|
|
4120934 |
Method for working-up shale
The invention is a method for working-up shale while recovering metals therefrom and the sulphur content thereof. The method comprises crushing the shale and leaching and roasting the shale. The...
|
|
|
4108957 |
Method for manufacture of phosphoric acid from phosphate rock
A method is disclosed for the manufacture of phosphoric acid directly from phosphate rock wherein the crushed phosphate rock is mixed with dilute phosphoric acid to form a slurry and the slurry is...
|
|
|
4098866 |
Recovery of uranium from refractory ores
Uranium is recovered from refractory carbonaceous-sulfidic ores or concentrates by leaching with nitric acid, followed by sorption on an ion exchange resin. In addition, the nitric acid leach...
|