Rare Earth Elements: A Review of Production, Processing ...

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Rare Earth Elements Review Appendix C – Process Flow Diagrams Figure C-1. (continued) It is recognized that the reference date for the figure above is 1988. Given the opportunity to comment on this diagram, Molycorp’s Scott Honan provided the following clarifications (personal communications, 2011): “– after the dissolution step, the insoluble fraction was a cerium product that contained about 60% REO by weight. The other product from dissolution was the liquor that fed solvent extraction. – the light RE elements are La, Ce, Nd, Pr. The first SX step separated these from everything else (Sm and the other heavies). Molycorp did run solvent extraction and other unit operations to further separate the heavies, and produced Eu products, Y-Eu co-precipitates, Sm, Gd and Tb products. As far as I know, Y was never produced at Mountain Pass, but it was purchased to combine with the Eu to make co-precipitates. – the chemical form of the Nd, Nd-Pr, Ce and La products varied. I would simply call these "products" instead of specifying a chemical form.” C-2
Rare Earth Elements Review Appendix C – Process Flow Diagrams Figure C-2. Treatment of a placer monazite concentrate by dredging (Aplan, 1988). C-3
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Rare Earth Elements Review Table of
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Foreword The U.S. Environmental Pro
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Abstract Rare earth elements (REEs)
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Table of Contents List of Acronyms
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List of Tables 2-1. Abundance of El
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Rare Earth Elements Review List of
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Rare Earth Elements Review Section
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