Magnetic Separator Line Receives Performance Upgrade
At the plant, iron-ore pulp with a top particle size of 1 mm is fed to Low-Intensity Magnetic Separators (LIMS) for magnetite removal. The remaining nonmagnetic fraction of hematite ore is delivered to the WHIMS rougher stage, where six DP 317 machines process 750 metric tons per hour (mt/h) of ore with 30%–36% Fe content. The concentrate yield is in the range of 50%–55% Fe content, produced at a rate of 400 mt/h, and is pumped to the cleaner stage WHIMS, which upgrade the concentrate to 60%–62% Fe. Tailings at less than 20% Fe content are returned to the rougher stage and reprocessed, finally yielding tailings with less than 10% Fe.
The existing rougher-stage WHIMS operate
at an intensity of 8.5 Gauss, and the
cleaner stage machines operate at 7.5
Gauss. According to the company, the new
machines will provide energy savings of
roughly 30% by running at a lower Gauss
level, while providing higher efficiency, lower
specific costs per ton, and better throughput.