The mining of ores serves to extract important metals contained in the rock. The rock with ore content, obtained by blasting, must be transported from the mine by means of heavy-duty vibrating feeders and fed to a crusher for crushing. In addition to the crushing of the rock chunks, the separation according to grain sizes by screening is an essential part of ore processing.
Enormously high conveying capacities, maximum availability and stable wear lining are demanded. IFE has been supplying machines with special properties to mines for decades. Heavy-duty vibrating feeders with 50 mm thick wear plates withstand the abrasive rock quantities (grain size 0 – 1000 mm) and convey up to 3000 t/h – with an expected service life of 10 years! Numerous realized projects underline the reliability of IFE machines.
Heavy duty vibrating feeder
Vibrating feeder with electromagnetic drive
At LKAB in Sweden, the idea of increasing the efficiency of the concentration process matured several years ago. The idea was to concentrate magnetite ore (up to 130 t/h) after the primary mill with the help of a magnetic drum in order to achieve a higher iron ore quality. The annual capacity of the KA3 enrichment plant is 5.5 to 6 million tons.
The process itself is designed as a fully autogenous grinding circuit consisting of the primary and secondary mills. Previously, the material was screened directly at the primary mill. The undersize material was transported on to a wet drum (LIMS) for magnetic separation, and the oversize material was fed onto an IFE screen by means of a conveyor.
The undersize material from the screen served as the grinding media for the secondary mill and the oversize material was discharged as a by-product. It usually has a higher gangue content because the gangue is harder than the ore.