Bastnasite composition

Mischmetal. Mischmetal [62379-61-7] contains, in metallic form, the mixed light lanthanides in the same or slightly modified ratio as occurs in the resource minerals. It is produced by the electrolysis of fused mixed lanthanide chloride prepared from either bastnasite or mona2ite. Although the precise composition of the resulting metal depends on the composition of chloride used, the cerium content of most grades is always close to 50 wt %. 

Rare Earths are produced primarily from three ores, monazite, xenotime, and bastnasite. Monazite is a phosphate mineral of essentially the cerium subgroup metals and thorium -(light rare Earths, Th) P04. The composition of monazite is reasonably constant throughout the world, with almost 50% of its rare Earth content as cerium and most of the remaining 50% as the other members of the cerium subgroup. Xenotime, like monazite, is a rare Earth orthophosphate but contains up to 63% yttrium oxide and also a markedly higher propor-... 

BASTNASITE. A wax-yellow reddish-brown, greasy mineral of the composition (Ce, La) (COi) F, usually found in contact zones or associated with zinc lodes. Sometimes spelled bastnaesite. 

Given the variety of important actinide oxidation states, what naturally occurring anion would best effect actinide mineralization The lanthanides, chemically analogous to the trivalent actinides, occur naturally in three commercially important forms monazite and xenotime, which are orthophosphate minerals, and bastnasite, which has the approximate composition LnFCOs. Uranium ores may be divided into... 

The world s resources of rare earth metals lie mainly in deposits of bastnasite in China. The chart below shows that mine production of the ore from China dominates the world s output. Bastnasite is a mixed metal carbonate fluoride, (M,M. ..)C03F. The composition varies with the source of the mineral, but the dominant component is cerium ( 50%), followed by lanthanum (20-30%), neodymium (12-20%) and praseod5mium (w5%). Each of the other rare earth metals (except for promethium which does not occur naturally) typically occurs to an extent of < 1 %. Monazite,... 

Bastnasite Common rare earth ore of composition REFCO3 (fluorocarbonate) rich in La, Ce, Pr, and Nd. 

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