Kinetics of Fe3O4 formation by air oxidation |
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| Authors: | Yang Xi-yun Gong Zhu-qing and Liu Feng-liang |
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| Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, China |
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| Abstract: | The kinetics of Fe3O4 formation by air oxidation of slightly acidic suspension of Fe(OH)2 was studied. The effects of initial concentration of Fe(II), temperature, partial pressure of oxygen, air flow rate and stirring
rate on the oxidation rate were investigated. The results show that Fe3O4 formation is composed of two-step reaction, the first step is the formation of Fe(OH)
2
+
by oxidation of Fe(OH)+ complex ions, the second step is the formation of magnetite by dehydration and deprotonation of Fe(OH)+ and Fe(OH)
2
+
. The oxidation reaction is zero-order with respect to the concentration of Fe(II) and around 0.5-order with respect to partial
pressure of oxygen, and oxygen transfer process is rate-limiting step of oxidation reaction with apparent activation energy
of 2.74 kJ · mol−1. |
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| Keywords: | Fe3O4 kinetics air oxidation |
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