امروز سه شنبه , 06 شهریور 1403
شنبه تا پنج شنبه - 9 صبح الی 20 عصر
دانلود مقاله : Continuous float–sink density separation of lump iron ore using a dry sand fluidized bed dense medium 2013
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دانلود مقاله :
Continuous float–sink density separation of lump iron ore using a dry sand fluidized bed dense medium 2013
نویسندگان:
Jun Oshitani , Soichiro Kajimoto , Mikio Yoshida , George V. Franks , Yasuo Kubo , Shingo Nakatsukasa
فرمت: pdf
چکیده :
A continuous separator based on float–sink density separation using a gas–solid fluidized bed dense medium
was used to upgrade iron ore. The separator has three devices for (A) conveying floaters, (B) recovering
floaters, and (C) conveying and recovering sinkers. The optimum speeds of these devices were
investigated using density adjusted spheres of the mm in the range of 2400–3300 kg/m3
in density increments of 100 kg/m3. A mixture of zircon sand and iron powder was used as the fluidized
medium to adjust the fluidized bed density to produce a separation kg/m3, a typical separation
density for lump iron ore wet separation. The recovery of the spheres as floaters or sinkers
depended on the speed of the devices, because the recovery was affected by the number density of
spheres directly under the feeder, the local fluidized bed density, and flow currents in the medium
derived from the movement of the devices. The optimum speeds were determined to be 3.5 cm/s for
(A), 2.0 rpm for (B) and 1.0 cm/s for (C), respectively. Continuous separation experiments were conducted
on lump iron ore particles in the size range of +11.1–31.5 mm in the fluidized bed with medium density
of 2850 kg/m3 and feed rate of 200 kg/h. Comparison of the feed rate and the recovery rate indicated that
the feed and the recovery were in equilibrium after 10 min of operation. The experiments resulted in
nearly perfect separation; 98.4% of the ore with density greater than 2850 kg/m3 was recovered. The
Fe, Al and Si content of the feed ore particles (before the separation) and the floaters and sinkers (after
the separation) was measured using inductively coupled plasma spectrometry. The separator produced
an upgrade in iron content of 3.3 wt% and reduced the Al and Si content by 44%.
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