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Slags involved in smelting-converting-refining operations to produce blister  copper at the Atlantic Copper smelter, in Huelva (Spain), have been  investigated by quantitative electron microprobe analysis, X-ray diffraction  and digital imaging techniques. The results showed that mechanically  entrapped matte particles are the dominant copper losses in the slags. The  largest proportion of Cubearing particles (2.0-3.5 vol %) is present in the  magnetite-rich converter slags, due to the negative effect of viscosity on  coalescence and precipitation of copper matte during conversion. They consist  of high-grade matte particles with a core of copper metal rimmed by a copper  sulfide phase (Cu2S). The mechanical entrainment of copper matte by slags  from both the flash and electric furnaces resulted in copper losses  accounting for less than 1.5 vol %, mostly occurring as tiny particles with a  stoichiometric composition close to that of bornite (Cu5FeS4). Copper was not  found to be enriched in fayalite and magnetite as solid solution

journal of mining and metallurgy. section  b, metallurgy/journal of mining and metallurgy. section b,  metallurgy

Occurrence and speciation of copper in slags obtained during the pyrometallurgical processing of chalcopyrite concentrates at the Huelva smelter (Spain)