STUDY ON DECOMPOSITION OF GOETHITE/SIDERITE IN THERMAL MODIFICATION THROUGH XRD, SEM AND TGA MEASUREMENTS

Shaoxian Song (), Feifei Jia and Changsheng Peng
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Shaoxian Song: School of Resource and Environmental Engineering, Wuhan University of Technology, Luoshi Road 22, Wuhan, Hubei Province 430070, P. R. China
Feifei Jia: Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona 550, San Luis Potosí, C. P. 78210, Mexico
Changsheng Peng: College of Environmental Science and Engineering, Ocean University of China, Qingdao, Shandong Province, 266100, P. R. China

Surface Review and Letters (SRL), 2014, vol. 21, issue 01, 1-6

Abstract: The decomposition of goethite and goethite/siderite concentrates into hematite with thermal modification was studied through the measurements of X-ray diffraction (XRD), scanning electronic microscope (SEM) and thermal gravimetric analysis (TGA). The experimental results showed that goethite decomposed into hematite directly at around 300°C without any intermediate phase and the decomposition of siderite completed at 500°C. Nanoscale granular structures were observed in the thermally treated products. It deserves highlighting that the decomposition processes proceeded from surfaces into bulks.

Keywords: Thermal decomposition; XRD; SEM; TGA; goethite; siderite; hematite (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0218625X1450019X

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