Oxidation behavior and mechanism of pentlandite at 973 K (700 °C) in air

Zhu, Huihui and Chen, Jun and Deng, Jinxia and Yu, Ranbo and Xing, Xianran (2012) Oxidation behavior and mechanism of pentlandite at 973 K (700 °C) in air. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 43 (3). pp. 494-502. ISSN 1073-5615

Abstract

The oxidation behavior of synthetic pentlandite at 973 K (700 °C) under isothermal conditions was investigated. The pentlandite sample (Ni,Fe)9S8 was synthesized from pure components and oxidized at 973 K (700 °C) in air in a muffle furnace. The phase identification and components analysis of the oxidation products were performed by using the Rietveld quantitative analysis method based on the powder X-ray diffraction (XRD) profiles and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX). The magnetic hysteresis loops were determined by a vibrating sample magnetometer. Fe 2O 3, NixFe 3-xO 4, and NiO were dominant oxidation products, and their weight fractions changed in different ways along with the oxidation time. The nickel-rich phase and sulfur-rich phase were observed as intermediate phases in unreacted cores during oxidation, which led to the formation of gaps and holes. The oxidation reaction rate was rapid in the first 2 hours, and then it slowed down sharply.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 19 Jun 2017 02:14
Last Modified: 19 Jun 2017 02:14
Uncontrolled Keywords: Energy dispersive x-ray spectroscopy; Intermediate phasis; Isothermal conditions; Muffle furnaces; Oxidation behaviors; Oxidation products; Oxidation reactions; Oxidation time; Phase identification; Powder X ray diffraction; Pure components; Rietveld; SEM-EDX; Unreacted cores; Vibrating sample magnetometer; Weight fractions; Light and Optics; Chemistry; Chemical Reactions;
Fields of Research : 09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091401 Electrometallurgy
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1007/s11663-011-9630-2
URI: http://eprints.usq.edu.au/id/eprint/31982

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