Behaviours of Arsenic, Antimony and Lead in Phase Equilibria among Copper, Matte and Calcium or Barium Ferrite Slag

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Calcium or barium ferrite slag was brought into equilibrium with matte or copper-matte phases and the distribution behaviour of minor impurities such as arsenic, antimony and lead was investigated.<BR>For equilibria involving high grade matte and slag, the impurities in slag can be considered as oxidic species, however, towards low matte grade they can be regarded as sulphidic or metallic species. This effect is due to the high mutual solubility between matte and calcium or barium ferrite slag when compared with the iron silicate slag system.<BR>In matte-slag equilibria, arsenic and antimony were highly concentrated in calcium and barium ferrite slags differing from the case of iron silicate slag. With respect to lead distribution the opposite sequence was obtained, although lead is rather concentrated in the matte phase. These behaviours can be ascribed to the more acid character of arsenic and antimony contrary to the basic nature of lead oxide.<BR>In copper-matte-slag equilibria, the distribution ratios of arsenic and antimony between slag and matte are extremely small, and follow the order of barium ferrite, calcium ferrite and iron silicate slag in decreasing sequence. For lead the highest distribution ratio corresponds to iron silicate slag followed by barium and finally by calcium ferrite slag.
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