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Characterization and Beneficiation of Phosphate-Bearing Rocks from Northern Michigan.

Authors
Brown-LL; Rule-AR; Daellenbach-CB
Source
MISSING :16 pages
Link
NIOSHTIC No.
10006699
Abstract
As part of the federal effort to help maintain an adequate supply of fertilizer materials, the Bureau of Mines conducted research to characterize complex low-grade Michigan phosphate materials and to devise methods for recovering fertilizer-grade phosphate concentrates. The rock is from middle preCambrian sedimentary formations in the Marquette Range located in the central part of the Upper Peninsula of Michigan. Occurrence of phosphate-bearing sediments in preCambrian rocks is rare. This deposit, containing 12 to 15 pct p2o5, is believed to be the richest preCambrian phosphate deposit in the United States. Petrographic examination showed that the conglomeritic rock contains crystalline apatite both in "black pebbles" and in quartz matrix. Attrition scrubbing and sizing tests showed that there is no tendency for phosphate to concentrate in any of the sized fractions. In beneficiation tests, which included grinding to minus 325 mesh followed by phosphate mineral flotation using a fatty acid-fuel oil collector, a phospate concentrate was obtained that had a grade of 30 pct p2o5 and a p2o5 recovery of 72 pct. This concentrate should be suitable for fertilizer manufacture.
Publication Date
19810101
Document Type
IH; Report of Investigation;
Fiscal Year
1981
NTIS Accession No.
NTIS Price
Identifying No.
RI 8562
NIOSH Division
ALRC;
Source Name
MISSING
State
MI;
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