Kinetics and mechanism of the decomposition of pyrite under conventional and quasi-isothermal — quasi-isobaric thermoanalytical conditions |
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Authors: | F Paulik J Paulik M Arnold |
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Institution: | (1) Institute for General and Analytical Chemistry, Technical University, Budapest, Hungary |
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Abstract: | The kinetics and mechanism of the thermal decomposition of pyrite were examined by the method of quasi-isothermal and quasi-isobaric thermogravimetry (Q-TG). It emerged that by means of this technique the overlapping partial processes of the complicated oxidation and decomposition reactions of pyrite can be separated and studied independently from one another. It was found that the partial reactions FeS2=FeS +S and Fe2O3–x(SO4)x=Fe2O3+SO3 are endothermic processes taking place quasiisothermally and leading to equilibrium, while the oxidation FeS+O2=Fe2O3–x(SO4)x is an exothermic process which takes place in an oscillating manner in a rather broad temperature interval.
Zusammenfassung Autoren untersuchten die Kinetik und den Mechanismus der thermischen Zersetzung von Pyrit durch quasi-isotherme und quasi-isobare Thermogravimetrie (Q-TG). Es stellte sich heraus, daß sich überlagernde Teilprozesse der komplizierten Oxydations- und Zersetzungsprozesse von Pyrit mit Hilfe dieser Technik absondern und unabhängig voneinander untersuchen lassen. Es wurde festgestellt, daß die Teilreaktionen FeS2=FeS+S und Fe2O3–x(SO4)x=Fe2O3+SO3 endotherme Prozesse sind, die quasi-isotherm verlaufen und zu einem Gleichgewicht führen, während die Oxydation FeS+O2=Fe2O3–x(SO4)x ein exothermer Prozeß ist, der oszillierend in einem ziemlich breiten Temperaturintervall verläuft.
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![lcy](/content/v24n0u6t47860125/xxlarge1083.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![ncy](/content/v24n0u6t47860125/xxlarge1085.gif) ![icy](/content/v24n0u6t47860125/xxlarge1080.gif) FeS+O2 =Fe2O3–x(SO4)x ![yacy](/content/v24n0u6t47860125/xxlarge1103.gif) ![vcy](/content/v24n0u6t47860125/xxlarge1074.gif) ![lcy](/content/v24n0u6t47860125/xxlarge1083.gif) ![yacy](/content/v24n0u6t47860125/xxlarge1103.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![tcy](/content/v24n0u6t47860125/xxlarge1090.gif) ![scy](/content/v24n0u6t47860125/xxlarge1089.gif) ![ecy](/content/v24n0u6t47860125/xxlarge1101.gif) ![kcy](/content/v24n0u6t47860125/xxlarge1082.gif) ![zcy](/content/v24n0u6t47860125/xxlarge1079.gif) ![ocy](/content/v24n0u6t47860125/xxlarge1086.gif) ![tcy](/content/v24n0u6t47860125/xxlarge1090.gif) ![rcy](/content/v24n0u6t47860125/xxlarge1088.gif) ![mcy](/content/v24n0u6t47860125/xxlarge1084.gif) ![icy](/content/v24n0u6t47860125/xxlarge1080.gif) ![chcy](/content/v24n0u6t47860125/xxlarge1095.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![scy](/content/v24n0u6t47860125/xxlarge1089.gif) ![kcy](/content/v24n0u6t47860125/xxlarge1082.gif) ![icy](/content/v24n0u6t47860125/xxlarge1080.gif) ![pcy](/content/v24n0u6t47860125/xxlarge1087.gif) ![rcy](/content/v24n0u6t47860125/xxlarge1088.gif) ![ocy](/content/v24n0u6t47860125/xxlarge1086.gif) ![tscy](/content/v24n0u6t47860125/xxlarge1094.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![scy](/content/v24n0u6t47860125/xxlarge1089.gif) ![scy](/content/v24n0u6t47860125/xxlarge1089.gif) ![ocy](/content/v24n0u6t47860125/xxlarge1086.gif) , ![kcy](/content/v24n0u6t47860125/xxlarge1082.gif) ![ocy](/content/v24n0u6t47860125/xxlarge1086.gif) ![lcy](/content/v24n0u6t47860125/xxlarge1083.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![bcy](/content/v24n0u6t47860125/xxlarge1073.gif) ![lcy](/content/v24n0u6t47860125/xxlarge1083.gif) ![yucy](/content/v24n0u6t47860125/xxlarge1102.gif) ![shchcy](/content/v24n0u6t47860125/xxlarge1097.gif) ![icy](/content/v24n0u6t47860125/xxlarge1080.gif) ![mcy](/content/v24n0u6t47860125/xxlarge1084.gif) ![scy](/content/v24n0u6t47860125/xxlarge1089.gif) ![shcy](/content/v24n0u6t47860125/xxlarge1096.gif) ![icy](/content/v24n0u6t47860125/xxlarge1080.gif) ![rcy](/content/v24n0u6t47860125/xxlarge1088.gif) ![ocy](/content/v24n0u6t47860125/xxlarge1086.gif) ![ocy](/content/v24n0u6t47860125/xxlarge1086.gif) ![tcy](/content/v24n0u6t47860125/xxlarge1090.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![mcy](/content/v24n0u6t47860125/xxlarge1084.gif) ![pcy](/content/v24n0u6t47860125/xxlarge1087.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![rcy](/content/v24n0u6t47860125/xxlarge1088.gif) ![acy](/content/v24n0u6t47860125/xxlarge1072.gif) ![tcy](/content/v24n0u6t47860125/xxlarge1090.gif) ![ucy](/content/v24n0u6t47860125/xxlarge1091.gif) ![rcy](/content/v24n0u6t47860125/xxlarge1088.gif) ![ncy](/content/v24n0u6t47860125/xxlarge1085.gif) ![ocy](/content/v24n0u6t47860125/xxlarge1086.gif) ![icy](/content/v24n0u6t47860125/xxlarge1080.gif) ![ncy](/content/v24n0u6t47860125/xxlarge1085.gif) ![tcy](/content/v24n0u6t47860125/xxlarge1090.gif) ![iecy](/content/v24n0u6t47860125/xxlarge1077.gif) ![rcy](/content/v24n0u6t47860125/xxlarge1088.gif) ![vcy](/content/v24n0u6t47860125/xxlarge1074.gif) ![acy](/content/v24n0u6t47860125/xxlarge1072.gif) ![lcy](/content/v24n0u6t47860125/xxlarge1083.gif) .
The authors thank Prof. E. Pungor for valuable discussions, and Mrs. M. Kiss and Miss I. Fabian for their technical assistance. |
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