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Multiple Zone Mining Beneficiation of Western Phosphate Rock. A Cost Estimate and Comparison With Selective Mining.

Spencer RH
NTIS: PB 200 049 :18 pages
This report describes investigations of the economic merits of multiple zone mining and beneficiation versus selective mining of altered western phosphate rock. The same deposit was considered in both instances and it was assumed that the grade of selectively mined ore was comparable to the grade of the concentrate from beneficiation. The beneficiating scheme used for the investigation was one proved by small continuous circuit operation. All economic factors were found to favor multiple zone mining plus beneficiation. Capital requirements and production costs were lower, and production life of the deposit was extended 4.5 Times. The concentrate from beneficiation would be a uniform high-quality feed for acidulation and would be low in stable metallic oxide (r2o3) content. Such a feed would permit improved plant operating control, and the low r2o3 would promote more rapid filtration and minimize sludge formation in the phosphoric acid. With the proposed treatment, the concentrate produced by flotation from this deposit would cost about 1.5 Times as much per ton as the concentrate produced by classification sizing. Therefore, inclusion of a flotation step in treatment schemes requires an economic analysis for each ore deposit.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7512
NIOSH Division
Source Name
NTIS: PB 200 049
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division