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Flotation of Marquette Range Nonmagnetic Taconite Using Innovative Procedures.

Frommer-DW; Wasson-PA; Veith-DL
NTIS: PB 227 174 :30 pages
Processing of nonmagnetic taconites by selective flocculation- desliming and anionic flotation of calcium-activated silica has been investigated using innovative procedures as a means of improving operating costs. Areas chosen for cost-cutting evaluation were grinding, fine screening, and water conservation and reclamation. The investigation was performed on Marquette Range nonmagnetic taconites in the Bureau of Mines Twin Cities Metallurgy Research Center flotation pilot plant, at feed rates ranging between 900 and 1,100 lb/hr. With fully integrated water reclamation, flotation concentrates containing 65.8 percent fe and 3.4 percent sio2 were made in the best operating period, with accompanying weight and iron recoveries of 40 and 74 percent, respectively. During this same period, the estimated cost of both flotation and water reclamation reagents was only $0.80 Per ton of concentrate (1968 pricing basis). This cost is about 15 percent lower than obtained previously at this center for flotation reagents only. The investigation demonstrated additional potential savings in operating costs of approximately $0.96 Per ton of concentrate through autogenous grinding as a substitute for ballmilling. Fine screening of intermediate concentrates was employed advantageously, but the frequency of blinding may be a factor militating against use of the screen in this flotation system. Work done in cooperation with the Cleveland-Cliffs Iron Company
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7826
NIOSH Division
Source Name
NTIS: PB 227 174