TY - GEN
T1 - Thermoanalytical study on the oxidation of sulfide minerals at high temperatures
AU - Pérez-Tello, Manuel
AU - Pérez-Fontes, Silvia Eugenia
AU - Prieto-López, Lizbeth Ofelia
AU - Brown, Francisco
AU - Castillón-Barraza, Felipe
PY - 2006
Y1 - 2006
N2 - An experimental study on the oxidation of chalcopyrite (CuFeS2), pyrite (FeS2), covellite (CuS) and chalcocite (Cu2S) particles was conducted by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. Oxygen concentration in the process gas was set to 40 and 70% by vol. and a heating rate of 40°C/min was used. Response variables included: the temperature of incipient reaction, the total exothermic heat of reaction, particle mass, morphology, and mineralogy of the reacted particles. Based on the experimental data and phase stability calculations, reaction mechanisms were proposed to represent the behavior of the particles during oxidation. The reaction mechanisms were verified by X-ray diffraction (XRD) analyses of the oxidized particles, and by thermochemical and mass balance calculations to reproduce the DSC and TGA thermograms. Overall kinetic models were developed to represent the evolution of the exothermic heat of reaction for each mineral as a function of time. Experiments conducted with copper concentrate particles containing the minerals studied suggest that the reaction mechanisms for the individual minerals can be used to represent the oxidation behavior of the copper concentrate particles.
AB - An experimental study on the oxidation of chalcopyrite (CuFeS2), pyrite (FeS2), covellite (CuS) and chalcocite (Cu2S) particles was conducted by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. Oxygen concentration in the process gas was set to 40 and 70% by vol. and a heating rate of 40°C/min was used. Response variables included: the temperature of incipient reaction, the total exothermic heat of reaction, particle mass, morphology, and mineralogy of the reacted particles. Based on the experimental data and phase stability calculations, reaction mechanisms were proposed to represent the behavior of the particles during oxidation. The reaction mechanisms were verified by X-ray diffraction (XRD) analyses of the oxidized particles, and by thermochemical and mass balance calculations to reproduce the DSC and TGA thermograms. Overall kinetic models were developed to represent the evolution of the exothermic heat of reaction for each mineral as a function of time. Experiments conducted with copper concentrate particles containing the minerals studied suggest that the reaction mechanisms for the individual minerals can be used to represent the oxidation behavior of the copper concentrate particles.
KW - Flash smelting
KW - Sulfide particles
KW - Thermal analysis
UR - http://www.scopus.com/inward/record.url?scp=33846065497&partnerID=8YFLogxK
M3 - Contribución a la conferencia
AN - SCOPUS:33846065497
SN - 0873396332
SN - 9780873396332
T3 - 2006 TMS Fall Extraction and Processing Division: Sohn International Symposium
SP - 741
EP - 754
BT - Sohn International Symposium
T2 - 2006 TMS Fall Extraction and Processing Division: Sohn International Symposium
Y2 - 27 August 2006 through 31 August 2006
ER -