Kinetics Behavior and Sulfur Transformations of Iron Sulfide during Supercritical Water Oxiation

Abstract:

Oxidation of iron sulfide in supercritical water was investigated in the batch reactor. Iron sulfide was converted in two parallel processes: gasification by water and oxidation by oxygen. Assuming that the reaction order of H₂O was 0, the activation energy and pre-exponential factor of the gasification process were determined to be 43kJ mol^-1 and 22.4 min^-1, correspondingly. It is found that above 773K the oxidation process was limited by the mass transfer of O2 to particles surface. Below 773K, with an assumption of zero order in H₂O concentration and first-order reaction in oxygen concentration, the activation energy and pre-exponential factor for the rate of oxidation were estimated as154kJ mol^-1 and 1.7×10⁶m³ mol^-1 min^-1, respectively. With supercritical water oxidation under the experimental conditions, the sulfur-containing components in the product were sulfide, sulfite and sulfate, in which sulfide and sulfate were predominant. It is likely to completely convert the sulfur to the sulfate by supercritical water oxidation using high temperature and long reaction time. The reaction pathway of iron sulfide could be expressed as: iron sulfide → sulfide → sulfite → sulfate.

• Periodical: Advanced Materials Research (Volumes 524-527)
• Pages: 1939-1942
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.524-527.1939
• Online since: May 2012
• Authors: Hong He Ma, Shu Zhong Wang, Lu Zhou
• Keywords: Iron Sulfide, Kinetic, Sulfur Transformations, Supercritical Water Oxidation

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