Abstract: |
The present invention relates to the recovery of rare earths, scandium, niobium, tantalum, zirconium, hafnium, titanium, and the like from ores or concentrates containing fluorine. More specifically, the ores or concentrates are pretreated by carbochlorination to convert the rare earths and other metals into their chlorides and then subjected to dilute hydrochloric acid leaching to recover the valuable rare earths and other metals from the leachate. Niobium, tantalum, zirconium, hafnium, and titanium can be recovered as their chlorides or oxychlorides from the gaseous products of carbochlorination, or converted into their oxides while simultaneously regenerating chlorine. |
Inventor: |
Sun, Kang (Arvada, CO, US); Baughman, David R. (Golden, CO, US); Hazen, Wayne W. (Lakewood, CO, US) |
Applicant: |
HAZEN RESEARCH, INC. (Golden, CO, US) |
Face Assignee: |
Hazen Research, Inc. (Golden, CO, US) |
Filed: |
2016-07-21 |
Issued: |
2020-05-05 |
Claims: |
21 |
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US10640847
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1. A method of recovering a mineral from a fluorine-containing ore or concentrate, the method comprising:
(8)
(5)
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11. A method of recovering a mineral comprising at least one of scandium, niobium, tantalum, zirconium, hafnium, titanium, and a rare earth element from a fluorine-containing ore or concentrate, comprising:
(7)
(5)
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21. A method of recovering a mineral from a fluorine-containing ore or concentrate, the method comprising:
(0)
(5)
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