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Influence of Thermal Treatments Upon Grindability of Low-grade Nonmagnetic Iron Ores.
Vik-RA; Daellenbach-CB; Mahan-WM
NTIS: PB 204 137 :30 pages
The influence of thermal treatments on the grindability of low-grade hematitic iron ores from Michigan and Minnesota was examined in bench-scale tests. Treatment factors were roasting temperature, roasting atmosphere, and ore cooling conditions. Bond ball mill grindability and work indices were used as response indicators in evaluating the condition of the ore. Of the three treatment factors evaluated, roasting atmosphere, which brought about the conversion of iron oxides to magnetite, had the most significant effect; roasting temperature had the next most important effect; and cooling condition had the least effect. Optimum grindability was obtained with reduced-quenched products of both ores at 650 deg c, near the alpha-beta phase transformation of quartz.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 204 137
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division