FIELD: chemistry.SUBSTANCE: invention relates to the technology of processing chemical concentrates of natural uranium, involving leaching (dissolving) the concentrate and extracting uranium using tributyl phosphate in a hydrocarbon diluent. The method involves dissolving the concentrate using aqueous nitric acid solution, feeding the obtained aqueous uranyl nitrate solution to the extract outputting step of a stepped extraction unit and extracting uranium with tributyl phosphate in a hydrocarbon diluent. Extraction is carried out by counterflow interaction of the aqueous and organic phases. Concentrate containing thorium impurities in ratio of 1 wt % to uranium is used. During extraction at the extract outputting step, the step for saturating the extractant with uranium is kept at least 87% of the maximum saturation of the extractant with uranium, and a portion of the aqueous phase, which is not more than 60 vol. % of the uranyl nitrate solution fed to the extract outputting step, after one of the extraction steps is removed from the extraction process and fed for dissolving the uranium concentrate.EFFECT: high extraction of uranium and nitric acid from the raffinate.1 tbl

Method of processing chemical concentrate of natural uranium

FIELD: metallurgy.SUBSTANCE: proposed method comprises leaching the stock nitric acid solution to obtain suspension, introducing coprecipitator therein at 30-50°C and mixing. Then, clarified solution is separated from insoluble residue and directed for extraction. Said coprecipitator represents fresh solution of copolymer of acrylamide and chloride trimethyl ammonium ethyl acrylate of molecular weight of 3-15 millions with low charge density. Copolymer is introduced to concentration of 5.95-11.9 mg/l of insoluble residue. Prior to separation of clarified solution from insoluble residue settling is performed for 30-40 minutes.EFFECT: lower processing costs.3 cl, 1 dwg, 1 tbl

Method of processing natural-origin uranium-bearing ore

FIELD: metallurgy. ^ SUBSTANCE: invention refers to procedures for processing chemical concentrate of natural uranium. The procedure consists in dissolving natural uranium in solution of nitric acid, in directing solution to uranium extraction with tri-butyl-phosphate and hydrocarbon thinner, in washing extract with re-extract and in uranium re-extracting. There is dissolved chemical concentrate of natural uranium with increased content of phosphorus and sulphur. Uranium is extracted from solutions with increased concentration of phosphorus and sulphur and with concentration of nitric acid 3080 g/l to 6075% saturation of extractant with uranium. Also this level of extractant saturation with uranium in the said range in % is maintained not exceeding value equal to (0.3u[HNO3]+51), where [HNO3] is concentration of nitric acid in solution directed to extraction, in g/l. ^ EFFECT: purification of uranium at minimal uranium losses with raffinate. ^ 2 tbl

Procedure for processing chemical concentrate of natural uranium

FIELD: chemistry. ^ SUBSTANCE: method implies uranium hot leaching with strong nitric acid and separation of aqueous phase from non-soluble residue prior to extraction processing. Leaching is carried out, weight ratio of nitric acid to uranium being (0.75-0.84): 1, at 85-100°, which results in aqueous phase uranium concentration of 700-800 g/l. Hot pulp is diluted with dilute nitric acid solutions to uranium concentration of 350-500 g/l in pulp aqueous phase and nitric acid concentration of ca. 1.0 mol/l, which is suitable for extraction processing aqueous phase. Then aqueous phase is separated from the solid residue. ^ EFFECT: resulting nitric-acid uranium solutions can be easily separated from solid phase and are suspension-free; solutions are suitable for extraction processing. ^ 1 tbl, 1 ex

Shikerun Timofej Gennad Evich

Papers

Procedure for processing chemical concentrate of natural uranium

Method for processing natural uranium oxides

Method of processing chemical concentrate of natural uranium