|
| |
A natural mixture of the rare-earth metals cerium, lanthanum, and
didymium; e.g., the waste matter from monazite sand after the extraction
of thoria may contain large quantities of ceria, lanthana, didymia,
yttria, and other substances. This is reduced to the metallic state by
converting the oxides to chlorides, and then recovering the metal by
electrolysis. The material obtained is an alloy containing about 50%
cerium and 45% lanthanum and didymium. Henderson
Source:
Dictionary of Mining, Mineral, and Related Terms
| |
|
