# US 10,480,048 B2 · Method for recovering rhenium, method for selectively recovering rhenium from solution including rhenium and other metals, and method for increasing content ratio of rhenium in solution including rhenium and other metals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,048 B2 - Document ID: US10480048B2 - Status: Granted - Kind: B2 - Application number: 15/746,779 - Filed: 2016-07-22 - Published: 2019-01-10 - Granted: 2019-11-19 - Earliest claimed: 2015-07-24 - Assignees: Kanagawa University; Asaka Riken Co., Ltd. - Applicants: Kanagawa University; Asaka Riken Co., Ltd. - Inventors: Hisao Hori - Web page: https://patentgrep.com/patent/US10480048B2 ## CPC - C22B 61/00: Obtaining metals not elsewhere provided for in this subclass (iron C21) - C01G 47/00: Compounds of rhenium - C22B 3/44: by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) - Y02P 10/20: Recycling - C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A method is provided which can separate rhenium from a solution containing rhenium by a simple procedure in a shorter time. A method of selectively recovering rhenium from a solution containing rhenium and one or more different metals is also provided. A method of recovering rhenium is used. The method involves (A) adding an electron donor (aliphatic secondary alcohol or aliphatic secondary thioalcohol) and a ketone compound to a solution containing perrhenate ions, (B) irradiating the solution after the addition step with ultraviolet light to precipitate a reduced species of the perrhenate ions contained in the solution, and (C) separating the reduced species of perrhenate ions from the solution, the reduced species being precipitated during the ultraviolet light irradiation. ## Claims ### Claim 1 A method of recovering rhenium, comprising: (A) adding an electron donor and a ketone compound to a solution containing perrhenate ions, the electron donor being an aliphatic secondary alcohol or an aliphatic secondary thioalcohol, (B) irradiating the solution after the addition with ultraviolet light to precipitate a reduced species of the perrhenate ions contained in the solution, and (C) separating the reduced species of the perrhenate ions from the solution, the reduced species being precipitated during the ultraviolet light irradiation, wherein the pH of the solution is 6.3 or higher during step (B). ### Claim 2 (depends on 1) The method of recovering rhenium according to claim 1, wherein the electron donor is an aliphatic secondary alcohol. ### Claim 3 (depends on 2) The method of recovering rhenium according to claim 2, wherein the electron donor is 2-propanol. ### Claim 4 (depends on 3) The method of recovering rhenium according to claim 3, wherein the ketone compound is acetone. ### Claim 5 (depends on 2) The method of recovering rhenium according to claim 2, wherein the ketone compound is acetone. ### Claim 6 (depends on 1) The method of recovering rhenium according to claim 1, wherein the electron donor is 2-propanol. ### Claim 7 (depends on 6) The method of recovering rhenium according to claim 6, wherein the ketone compound is acetone. ### Claim 8 (depends on 1) The method of recovering rhenium according to claim 1, wherein the ketone compound is acetone. ### Claim 9 A method of selectively recovering rhenium from a solution containing rhenium and one or more different metals, comprising: adding an electron donor and a ketone compound to a solution containing perrhenate ions and a co-existing metal other than alkali metals and alkaline earth metals, the electron donor being an aliphatic secondary alcohol or an aliphatic secondary thioalcohol; adjusting the pH of the solution to 6.3 or higher; and irradiating the solution with ultraviolet light to precipitate a reduced species of the perrhenate ions contained in the solution, wherein the co-existing metal is molybdenum. ### Claim 10 A method of enriching rhenium in a solution containing rhenium and one or more different metals, comprising: adding an electron donor and a ketone compound to a solution containing perrhenate ions and a co-existing metal other than alkali metals and alkaline earth metals, the electron donor being an aliphatic secondary alcohol or an aliphatic secondary thioalcohol; adjusting the pH of the solution to a range of higher than 2.1 and up to 4.7; and irradiating the solution with ultraviolet light to precipitate a compound of the co-existing metal contained in the solution, wherein the co-existing metal is molybdenum.