Mechanochemical effects on the molybdenite roasting kinetics

The kinetics of molybdenite roasting was studied by non-isothermal TGA–DTA with heating rate 10 °C min −1. Mechanical activation of molybdenite was accomplished via milling in a planetary mill under air atmosphere. Mechanical activation decreased the ignition temperature of reaction from 470 to 180...

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Bibliographic Details
Published inChemical engineering journal (Lausanne, Switzerland : 1996) Vol. 121; no. 2; pp. 65 - 71
Main Authors Ebrahimi-Kahrizsangi, Reza, Abbasi, Mohammad Hasan, Saidi, Ali
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.08.2006
Elsevier
Subjects
Applied sciences
Chemical engineering
Exact sciences and technology
Grinding
Kinetics
Mechanical activation
Molybdenite
Non-isothermal
Oxidation
Reactors
Solid-solid systems
TGA–DTA
TGA–DTA
Molybdenite
Non-isothermal
Oxidation
Kinetics
Mechanical activation
Planetary mill
Heating rate
Ignition
Thermogravimetry
Differential thermal analysis
Modeling
TGA-DTA
Reaction mechanism
Diffusion
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Summary:The kinetics of molybdenite roasting was studied by non-isothermal TGA–DTA with heating rate 10 °C min −1. Mechanical activation of molybdenite was accomplished via milling in a planetary mill under air atmosphere. Mechanical activation decreased the ignition temperature of reaction from 470 to 180 °C after 36 h of milling. The model-fitting kinetic approach has been applied to TGA data. The reaction mechanism for non-activated molybdenite was determined to be chemically controlled with E = 34.25 kcal mol −1 and A = 2 × 10 8 s −1. In the activated molybdenite the reaction mechanism changed to diffusion control with E = 60.55 kcal mol −1 and A = 6 × 10 19 s −1.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2006.04.011