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The leaching of a chalcopyrite concentrate in ammonia
Author(s) -
Reilly Irvine G.,
Scott Donald S.
Publication year - 1977
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450550508
Subject(s) - chalcopyrite , ammonia , dissolution , oxygen , electrochemistry , chemistry , inorganic chemistry , reaction rate , leaching (pedology) , activation energy , electrode , copper , catalysis , organic chemistry , environmental science , soil science , soil water
The rate of dissolution of a chalcopyrite concentrate was measured in ammoniacal solutions under oxygen pressure for conditions when chemical reaction rate controlled. Temperatures from 50°‐95°C, oxygen pressures to 689 kPa and ammonia concentrations from 2.5 to 7.0 mol/ l were investigated. An electrochemical surface reaction model in which the cathodic reduction of oxygen on the solid surface is rate determining satisfactorily predicts experimental behaviour in the range of experimental data. The activation energy for the reaction was found to be 74.1 kJ/mol.