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Influence of Mechanical Activation on the selectivity of Bornite Leaching
Sulfidic mineral bornit Cu5FeS4 was exposed to the selective leaching of copper in H2SO4 solution. Surface changes of the mechanically activated sulphide were investigated before and after leaching using the infrared spectroscopy and the scanning electron microscopy. The mechanical activation of the mineral resulted in the mechanochemical surface oxidation and in the formation of the carbonates and sulphates. Furthermore, the specific area and the disordering of the mineral crystal structure increased. These aspects influence the kinetic and selectivity of acid leaching of bornite.Acid leaching of mechanically activated bornite follows through the two stages. In the first, rapid stage of leaching, the simple dissolution of products occurs (iron carbonate, copper and iron sulphate), which are situated in the surface layer of mechanically activated bornite. A relatively high iron recovery is due to the dissolution of hematite which is a minor component of bornite. The second, slow stage of leaching represents leaching of minerals. Iron do not practically underlies to the leaching and the recovery of copper increases gradually.The leaching selectivity of bornite is defined by the ratio Cu/Fe and increases with the growing time of mechanical activation, but only to 10 minutes. Subsequently, an additional increase of the time of mechanical activation tends to decrease the selectivity what is probably caused by the effect of the reduction of reaction surface processes due to agglomeration effects pending the milling and the formation of sulphur on the surfaces of particles which restricted the access of reagents to the remaining mineral. Moreover, this fact was observed by the SEM analysis of bornite. The interdependence between the leaching selectivity of bornite and specific surface area indicates a direct effect of the surface deformation of mechanically activated bornite on the selectivity of leaching.
Influence of Mechanical Activation on the selectivity of Bornite Leaching
Sulfidic mineral bornit Cu5FeS4 was exposed to the selective leaching of copper in H2SO4 solution. Surface changes of the mechanically activated sulphide were investigated before and after leaching using the infrared spectroscopy and the scanning electron microscopy. The mechanical activation of the mineral resulted in the mechanochemical surface oxidation and in the formation of the carbonates and sulphates. Furthermore, the specific area and the disordering of the mineral crystal structure increased. These aspects influence the kinetic and selectivity of acid leaching of bornite.Acid leaching of mechanically activated bornite follows through the two stages. In the first, rapid stage of leaching, the simple dissolution of products occurs (iron carbonate, copper and iron sulphate), which are situated in the surface layer of mechanically activated bornite. A relatively high iron recovery is due to the dissolution of hematite which is a minor component of bornite. The second, slow stage of leaching represents leaching of minerals. Iron do not practically underlies to the leaching and the recovery of copper increases gradually.The leaching selectivity of bornite is defined by the ratio Cu/Fe and increases with the growing time of mechanical activation, but only to 10 minutes. Subsequently, an additional increase of the time of mechanical activation tends to decrease the selectivity what is probably caused by the effect of the reduction of reaction surface processes due to agglomeration effects pending the milling and the formation of sulphur on the surfaces of particles which restricted the access of reagents to the remaining mineral. Moreover, this fact was observed by the SEM analysis of bornite. The interdependence between the leaching selectivity of bornite and specific surface area indicates a direct effect of the surface deformation of mechanically activated bornite on the selectivity of leaching.
Influence of Mechanical Activation on the selectivity of Bornite Leaching
Peter Baláž (Autor:in) / Marcela Achimovičová (Autor:in)
2004
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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