Influence of alumina on mineralogy and environmental properties of zinc-copper smelting slags

• An iron-silicate slag, from a zinc-copper smelting process, and mixtures of this slag with 5, 10 and 15 wt-% alumina addition were re-melted, semi-rapidly solidified and characterized using scanning electron microscopy equipped with energy dispersive spectroscopy, and X-ray diffraction. The FactSageTM6.2 thermodynamic package was applied to compare the stable phases at equilibrium conditions with experimental characterization. A standard European leaching test was also carried out for all samples to investigate the changes in leaching behaviour due to addition of alumina. Results show that the commonly reported phases for slags from copper and zinc production processes (olivine, pyroxene and spinel) are the major constituents of the current samples. A correlation can be seen between mineralogical characteristics and leaching behaviours. The sample with 10 wt-% alumina addition, which contains high amounts of spinels and lower amounts of the other soluble phases, shows the lowest leachabilities for most of the elements.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

Process Metallurgy

Processmetallurgi

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)