Method for separating and recovering rare-earth elements
View Patent ↗A method for separating and recovering a plurality of rare-earth elements, the method including a step of introducing, into a liquid, a mixture containing a rare-earth oxychloride and a rare-earth chloride, the rare-earth oxychloride constituted from a rare-earth element different from a rare-earth element constituting the rare-earth chloride, thereby obtaining an insoluble matter containing the rare-earth oxychloride and a liquid in which the rare-earth chloride is dissolved, a step of recovering the rare-earth oxychloride from the insoluble matter, and a step of recovering the rare-earth chloride from the liquid in which the rare-earth chloride is dissolved.
1. A method for separating and recovering a plurality of rare-earth elements, the method comprising the steps of:
introducing, into a liquid containing an organic solvent, a mixture containing a rare-earth oxychloride and a rare-earth chloride, the rare-earth oxychloride comprising a first rare-earth element, the rare-earth chloride comprising a second rare-earth element different from the first rare-earth element, thereby obtaining an insoluble matter containing the rare-earth oxychloride and a liquid in which the rare-earth chloride is dissolved;
recovering the rare-earth oxychloride from the insoluble matter; and
recovering the rare-earth chloride from the liquid in which the rare-earth chloride is dissolved.
2. The method for separating and recovering a plurality of rare-earth elements according to claim 1 ,
wherein the organic solvent is an alcohol.
3. The method for separating and recovering a plurality of rare-earth elements according to claim 1 ,
wherein the rare-earth oxychloride is an oxychloride containing dysprosium.
4. The method for separating and recovering a plurality of rare-earth elements according to claim 1 ,
wherein the rare-earth chloride is a chloride containing neodymium.
5. A method for separating and recovering a plurality of rare-earth elements, the method comprising the steps of:
introducing, into a liquid, a mixture containing a first rare-earth oxychloride and a second rare-earth oxychloride, the first rare-earth oxychloride comprising a first rare-earth element, the second rare-earth oxychloride comprising a second rare-earth element different from the first rare-earth element, thereby obtaining a liquid in which the first rare-earth oxychloride is dissolved;
recovering the first rare-earth oxychloride from the liquid in which the first rare-earth oxychloride is dissolved; and
recovering the second rare-earth oxychloride from an insoluble matter which is not dissolved in the liquid.
6. The method for separating and recovering a plurality of rare-earth elements according to claim 5 ,
wherein the first rare-earth oxychloride is an oxychloride containing dysprosium.
7. The method for separating and recovering a plurality of rare-earth elements according to claim 5 ,
wherein the second rare-earth oxychloride is an oxychloride containing neodymium.
8. A method for separating and recovering a plurality of rare-earth elements, the method comprising the steps of:
introducing, into a liquid containing an organic solvent, a mixture containing a first rare-earth oxychloride and a second rare-earth oxychloride, the first rare-earth oxychloride comprising a first rare-earth element, the second rare-earth oxychloride comprising a second rare-earth element different from the first rare-earth element, thereby obtaining a liquid in which the first rare-earth oxychloride is dissolved;
recovering the first rare-earth oxychloride from the liquid in which the first rare-earth oxychloride is dissolved; and
recovering the second rare-earth oxychloride from an insoluble matter which is not dissolved in the liquid.
9. The method for separating and recovering a plurality of rare-earth elements according to claim 8 ,
wherein the organic solvent is an alcohol.
10. The method for separating and recovering a plurality of rare-earth elements according to claim 8 ,
wherein the first rare-earth oxychloride is an oxychloride containing dysprosium.
11. The method for separating and recovering a plurality of rare-earth elements according to claim 8 ,
wherein the second rare-earth oxychloride is an oxychloride containing neodymium.
12. A method for separating and recovering a plurality of rare-earth elements, the method comprising the steps of:
heating a composition containing a plurality of rare-earth elements in a chlorine atmosphere, thereby forming a mixture containing a rare-earth oxychloride and a rare-earth chloride, the rare-earth oxychloride comprising a first rare-earth element, the rare-earth chloride comprising a second rare-earth element different from the first rare-earth element;
introducing the mixture into a liquid containing an organic solvent, thereby obtaining an insoluble matter containing the rare-earth oxychloride and a liquid in which the rare-earth chloride is dissolved;
recovering the rare-earth oxychloride from the insoluble matter; and
recovering the rare-earth chloride from the liquid in which the rare-earth chloride is dissolved.
13. The method for separating and recovering a plurality of rare-earth elements according to claim 12 ,
wherein the organic solvent is an alcohol.
14. The method for separating and recovering a plurality of rare-earth elements according to claim 12 ,
wherein the rare-earth oxychloride is an oxychloride containing dysprosium.
15. The method for separating and recovering a plurality of rare-earth elements according to claim 12 ,
wherein the rare-earth chloride is a chloride containing neodymium.
16. A method for separating and recovering a plurality of rare-earth elements, the method comprising the steps of:
heating a composition containing a plurality of rare-earth elements in a chlorine atmosphere, thereby forming a mixture containing a first rare-earth oxychloride and a second rare-earth oxychloride, the first rare-earth oxychloride comprising a first rare-earth element, the second rare-earth oxychloride comprising a second rare-earth element different from the first rare-earth element;
introducing the mixture into a liquid, thereby obtaining a liquid in which the first rare-earth oxychloride is dissolved;
recovering the first rare-earth oxychloride from the liquid in which the first rare-earth oxychloride is dissolved; and
recovering the second rare-earth oxychloride from an insoluble matter which is not dissolved in the liquid.
17. The method for separating and recovering a plurality of rare-earth elements according to claim 16 ,
wherein the first rare-earth oxychloride is an oxychloride containing dysprosium.
18. The method for separating and recovering a plurality of rare-earth elements according to claim 16 ,
wherein the second rare-earth oxychloride is an oxychloride containing neodymium.
19. A method of separating and recovering a plurality of rare-earth elements, the method comprising the steps of:
heating a composition containing a plurality of rare-earth elements in a chlorine atmosphere, thereby forming a mixture containing a first rare-earth oxychloride and a second rare-earth oxychloride, the first rare-earth oxychloride comprising a first rare-earth element, the second rare-earth oxychloride comprising a second rare-earth element different from the first rare-earth element;
introducing the mixture into a liquid containing an organic solvent, thereby obtaining a liquid in which the first rare-earth oxychloride is dissolved;
recovering the first rare-earth oxychloride from the liquid in which the first rare-earth oxychloride is dissolved; and
recovering the second rare-earth oxychloride from an insoluble matter which is not dissolved in the liquid.
20. The method for separating and recovering a plurality of rare-earth elements according to claim 19 ,
wherein the organic solvent is an alcohol.
21. The method for separating and recovering a plurality of rare-earth elements according to claim 19 ,
wherein the first rare-earth oxychloride is an oxychloride containing dysprosium.
22. The method for separating and recovering a plurality of rare-earth elements according to claim 19 ,
wherein the second rare-earth oxychloride is an oxychloride containing neodymium.