220 results about "Uranous" patented technology

A process for oxidation of ferrous ions in solution, and more particularly a process for improved base metal and / or uranium leaching from ores, concentrates or tailings using ferric ion as an oxidizing agent. A reaction vessel (10) holds a ferrous ion-containing solution, for example, a copper sulphide leach slurry or concentrate. An agitator (12) may be provided to promote leaching of the base metal into solution. Some of the ferrous ion-containing solution is drawn off from the reaction vessel (10) and pumped through an in-line mixer (14) via a feed pump (16). Oxygen is injected into the reactor (14) to facilitate oxidation of the ferrous sulphate to form ferric sulphate. The ferric ion-containing solution is then recirculated back to the reaction vessel (10) where the ferric ions are reused in the dissolution of copper sulphide into soluble copper sulphate. The two processes of ferrous oxidation and metal leaching can be conducted either simultaneously or sequentially to effect recovery of copper, other base metals or uranium from ores, concentrates or tailings.

An improved process of extraction of uranium from phosphoric acid and in particular uranium VI from phosphoric acid especially strong phosphoric acid using a selective synergistic extractant mix of an organo-phosphorous acid and a neutral extraction agent. The process basically involves the steps of extraction comprising contacting said acid with a selective synergistic extractant system of di-nonyl phenyl phosphoric acid (DNPPA) and a neutral agent selected from di-butyl butyl phosphonate (DBBP) and tri-n-octyl phosphine oxide (TOPO); and recovering the uranium values from the loaded organic phase. The above process would provide for an improved process for recovery of uranium both from weak and strong phosphoric acids using a stable and relatively cheap extractant system. The process is directed to improved recovery of U-VI from phosphoric acid by way of a simple, industrially applicable and cost-effective process.

The invention discloses a uranyl ion imprinted polymer and a preparation method and application thereof. The uranyl ion imprinted polymer is prepared by the steps of with a uranyl ion as a template and beta-diketone modified with acryloyl group or methacryloyl as a functional monomer, carrying out polymerization reaction under the actions of an initiator and a cross-linking agent, and removing the template uranyl ion from the obtained polymer after the reaction is ended. The imprinted polymer can compete to absorb uranyl ions from uranyl ammonium carbonate containing a lot of free carbonates, is high in adsorption capacity, and is not interfered by metal ions such as Li<+>, Na<+>, K<+> and Rb<+>. Therefore, the imprinted polymer can be used for adsorbing and extracting uranium form sea water with complicated ingredients and low uranium concentration.

The invention discloses a device, method and application for extracting uranium from uranium-containing wastewater or seawater, and the device for extracting the uranium comprises a photo-anode, a cathode reaction piece and a photocatalytic light source. The photo-anode comprises an anode reaction piece and a photocatalyst layer arranged on the surface of the anode reaction piece. The cathode reaction piece is connected with the anode reaction piece through a wire. The photocatalytic light source adopts ultraviolet light, visible light or infrared light. When a photocatalytic fuel cell is usedfor extracting the uranium from the uranium-containing wastewater and seawater, an external power source is not needed, a proton exchange membrane and an oxide inhibitor do not need to be added, meanwhile, inert gas atmosphere protection is not needed, and operation can be conducted in the air atmosphere. Hexavalent uranyl ions in the wastewater and seawater can be efficiently reduced into tetravalent uranium which is low in toxicity and almost insoluble in water, the tetravalent uranium is gathered onto a cathode, uranium is desorbed from the surface of a photocatalyst without acid picklingor air purging reoxidation, uranium can be efficiently recycled by regularly replacing a cathode material, uranium reduction products are easy and convenient to collect, and continuous operation of asystem is not influenced.

The invention belongs to the technical field of organic matter separation and particularly relates to a method for removing organic matter in a uranium-bearing alkaline leaching solution. The method comprises the following steps that (1) the organic matter is removed through weakly alkaline adsorption resin, specifically, the weakly alkaline acrylic skeleton adsorption resin is added into an ion exchanging column, the uranium-bearing alkaline leaching solution is selected so as to conduct a dynamic adsorption test on the organic matter in the uranium-bearing alkaline leaching solution; (2) drip washing of the weakly alkaline adsorption resin is conducted, specifically, before drip washing, the column is washed through a sodium carbonate solution with the mass concentration being 5g / L; and(3) uranium is recovered through strongly alkaline anion exchanging resin, specifically, the strongly alkaline anion exchanging resin is added into the ion exchanging column, the uranium-bearing alkaline leaching solution treated in the step (1) is selected, and uranium in the uranium-bearing alkaline leaching solution is subjected to dynamic adsorption, wherein the contact time is 5-15 min, and the penetration concentration is determined to be 5 mg / L. Through the method, the problem of organic matter poisoning in the technique of ion exchanging for uranium extraction can be effectively solved, uranium is not adsorbed while the organic matter is adsorbed and removed, the uranium separating efficiency is improved, and technological support is provided for an alkaline method uranium extraction technique.

The super oxidation, coagulation and flocculation system is applicable to water and wastewater chemical treatment in which oxidation, coagulation and flocculation processes take place in a single vessel.The apparatus and process can be used for treatment of domestic and industrial water and wastewater for removal of organic and inorganic contaminants.The oxidation process can be provided by several oxidizing chemicals such as ozone, hydrogen peroxide, potassium permanganate, chlorine and Ultra Violet Lights, and the coagulation process can be accomplished with several coagulants such as aluminum sulphide, ferric chloride, ferric sulphate.Selection of the chemicals depends on the quality of the water or wastewater to be treated and the treated water quality required, and it covers a wide range of impurities to be removed and specifically difficult to oxidize hydrocarbons and chlorinated organics, and iron, manganese, uranium, arsenic, cyanide, hydrogen sulphide.The apparatus and the process are economical and have a small installation footprint as several processes take place in a single vessel.

The invention discloses a method for preparing hollow UO2 nanospheres by ammonium uranyl carbonate solution irradiation. The method includes: preparing low-concentration UO2(CO3)3<4-> alkaline solution containing a free radical removing agent; adopting electron beam or gamma-ray irradiation to obtain the hollow UO2 nanospheres, different in diameter, wall thickness and cavity diameter, formed by self assembly of nanoparticles through control of conditions such as absorbed dose and dose rate. A uranium oxide hollow nanostructure which is prepared for the first time is conducive to researches of application of uranium oxide nanoparticles to fields of nuclear fuel, catalysis and the like.