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Fly-ash pellets
Fly-ash from electric furnaces and convertors is a by-product of steel and cast iron manufacturing. They are noted for their relatively high content of oxides of iron which, however, are not exploitable in the form of dust.
The pellets produced through the technology of the granulation of the dust exhausts with high content of iron oxides are exploitable in steelmaking process in place of iron-ore pellets.
Due to the developed pelletization technology for these steel fly ashes we can make cylinder-shaped pellets from the dust exhausts that can be recharged in the steel aggregates. The pellets can be used in place of iron-ore pellets which saves primary raw material and at the same time a by-product is recycled which otherwise would have to be expensively disposed of as waste.
Our operating experience with additional pellet charge in electric arc furnaces shows that the pellets can be put to the charge in the oxidization stage of heat. If iron ore is added in the course of the melty proces, fly-ash pellets can be used as an economical option. The impurities contained in dust exhausts (such as non-ferrous metals) remain largely in slag and that is why they have no impact on the purity of produced steel.
In 2010 the testing of a mobile equipment for processing fly-ash directly at the places of their origin was completed.
