Kinetics of the sulfidation of chalcopyrite with gaseous sulfur |
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Authors: | R Padilla E Olivares M C Ruiz H Y Sohn |
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Affiliation: | (1) the Department of Metallurgical Engineering, University of Concepción, Concepción, Chile;(2) the Department of Metallurgical Engineering, University of Utah, 84112-1183 Salt Lake City, UT |
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Abstract: | The sulfidation of chalcopyrite with gaseous sulfur in the temperature range of 325 °C to 400 °C occurs with the formation
of covellite and pyrite as the final products. The rate of sulfidation depends strongly on the temperature, with nearly complete
conversion in less than 30 minutes at 400 °C. Microscopic analysis of partially and completely reacted particles showed that
the sulfidation proceeded topochemically, with a shrinking core of unreacted chalcopyrite surrounded by successive layers
of FeS2 and CuS. The experimental data exhibited an induction period at the beginning of the reaction. An electrochemical mechanism
is proposed for the sulfidation reaction, which involves simultaneous diffusion of Cu− and electrons through the product layers. The rate data showed that the fraction reacted is well represented by a shrinking-core
model controlled by the reaction occurring at the chalcopyrite-pyrite interface, resulting in the conversion-vs-time relationship 1−(1−X)1/3=k(t−t
ind). An activation energy of 98.4 kJ/mol was determined for the temperature range of 325 °C to 400 °C. |
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