Kinetics of chemical leaching of chalcopyrite from low grade copper ore: behavior of different size fractions |
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Authors: | H Naderi M Abdollahy N Mostoufi M J Koleini S A Shojaosadati Z Manafi |
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Institution: | (1) Department of Metallurgy, Indian Institute of Science, 560012 Bangalore , India;(2) Department of Chemical Engineering, Indian Institute of Science, 560012 Bangalore , India; |
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Abstract: | The kinetics of the chemical leaching of copper from low grade ore in ferric sulfate media was investigated using the constrained
least square optimization technique. The experiments were carried out for different particle sizes in both the reactor and
column at constant oxidation-reduction potential (E
h), pH values, and temperature. The main copper mineral was chalcopyrite. About 40% of Cu recovery is obtained after 7 d of
reactor leaching at 85°C using −0.5 mm size fraction, while the same recovery is obtained at 75°C after 24 d. Also, about
23% of Cu recovery is obtained after 60 d of column leaching for +4-−8 mm size fraction whereas the Cu recovery is as low
as about 15% for +8-−12.7 and +12.7-−25 mm size fractions. A 4-stage model for chalcopyrite dissolution was used to explain
the observed dissolution behaviors. The results show that thick over-layers of sulphur components cause the parabolic behavior
of chalcopyrite dissolution and the precipitation of Fe3+ plays the main role in chalcopyrite passivation. In the case of coarse particles, transformation from one stage to another
takes a longer time, thus only two stages including the initial reaction on fresh surfaces and S0 deposition are observed. |
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