Sulfuric acid roasting is the primary means of extracting bastnaesite at Bayan Obo.
See page 322 in:
Rare Earths Industry: Technological, Economic, and Environmental Implications
edited by Ismar Borges De Lima, Walter Leal Filho
https://books.google.com/books?id=4...AQ#v=onepage&q=bastnaesite processing&f=false
OR see Section 2.3.1 starting on page 44 of Rare Earth Beneficiation and Hydrometallurgical Processing by J. Zhang 2016
https://scholar.google.com/scholar?cluster=5905946583370882289&hl=en&as_sdt=0,5&sciodt=0,5
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