Control of Residual Sulfides in Flotation Tailings of Cu-Ni Duluth Complex via Grinding Media Selection
2001
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Control of Residual Sulfides in Flotation Tailings of Cu-Ni Duluth Complex via Grinding Media Selection
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2001
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University of Minnesota Duluth
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Technical Report
Abstract
The effects of grinding media chemistries on ball wear and flotation were
compared by grinding a Cu-Ni bearing Duluth Complex sample using forged steel and
27% Cr cast iron balls under nitrogen, air and oxygen atmospheres. Both types of balls
increased their wear in air and oxygen atmospheres, but Cr balls wore only one-third as
much as forged steel balls. The wear increased roughly in proportion to the oxygen
content of the mill atmosphere. Flotation recoveries of sulfide minerals were adversely
affected when the sample was ground in a nitrogen atmosphere. Residual sulfur in
flotation tailings ground using both types of grinding balls under an air or oxygen
atmosphere was lowered to about 0.15%, with Cr balls producing somewhat lower
sulfur values. Davis magnetic tube tests on flotation tailings lowered the residual sulfur
to 0. 1 % or less by recovering mainly pyrrhotite. PGM recoveries paralleled the
recoveries of sulfur, although Pd recoveries remained somewhat lower, implying that a
part of Pd might be associated with pyrrhotite. Pd, not recovered in flotation, appeared
to be recovered by magnetic separation of flotation tailings.
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Iwasaki, Iwao. (2001). Control of Residual Sulfides in Flotation Tailings of Cu-Ni Duluth Complex via Grinding Media Selection. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/187125.
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