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Rare-earth occurrences in the Pea Ridge tailings.

Authors
Vierrether-CW; Cornell-WL
Source
Rolla, MO: U.S. Department of the Interior, Bureau of Mines, RI 9453, 1993 Jan; :1-10
NIOSHTIC No.
10003170
Abstract
Tailings from the Pea Ridge iron mine contain significant amounts of apatite, which has rare-earth element values associated with it. In association with the recovery of rare-earth minerals as a secondary resource, the U.S. Bureau of Mines conducted an investigation on the recoverability of the rare-earth minerals from these tailings. The mill tailings were subjected to a phosphate flotation to separate the apatite from other constituents. More than 70-pct recovery of the rare-earth values was achieved. Based on mineralogical characterization and prior analysis of rare-earth bearing breccia pipe material at Pea Ridge, it is proposed that processing this phosphate concentrate on a vanner table would yield up to a 95-pct recovery of the rare earths in the concentrate, with the apatite reporting to the tailings. Intensive ore microscopy studies of the original tailings to the flotation products led to the identification of monazite, xenotime, and rare-earth-enriched apatite as the major rare-earth-bearing minerals in the tailings.
Keywords
Mining-industry; Mineral-processing; Waste-treatment; Rare-earth-metals; Rare-earths
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-189595
NTIS Price
A03
Identifying No.
RI-9453
NIOSH Division
RORC
Source Name
Rolla, MO: U.S. Department of the Interior, Bureau of Mines, RI 9453
State
MO
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