The Study on the Mineral Phase Transformations and Thermodynamics of Laterite Ores Calcination

Yu Ling Xu; Song Chen; Shu Qiang Gui; Yu Yang Bian; Wei Zhong Ding; Ding Sheng Tan

doi:10.4028/www.scientific.net/AMR.813.250

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 813The Study on the Mineral Phase Transformations and...

The Study on the Mineral Phase Transformations and Thermodynamics of Laterite Ores Calcination

Abstract:

In this paper, mineralogical phase transformations of Indonesia nickel laterite ores are studied during calcinations, the thermodynamics of process are also investigated. Different factors that affect the reduction of the laterite ores are tested and analyzed by Differential Scanning Calorimeter (DSC), X-ray Diffraction (XRD), Brunauer Emmett Teller (BET) and Scanning Electron Microscope (SEM). The results show that during calcination process, goethite is dehydrolyzed by removing structural water at about 300°C, which then transforms to hematite, and serpentine decomposes at around 600~700°C, leading to formulate olivine if agglomerating at higher temperature. By thermodynamics calculation, the goethite dehydration temperature is under 100°C, and about 200°C for serpentine decomposition. It might be the inclusions in ore which make laterite become hard to decompose.

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Periodical:

Advanced Materials Research (Volume 813)

Pages:

250-254

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.813.250

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Online since:

September 2013

Authors:

Yu Ling Xu, Song Chen, Shu Qiang Gui, Yu Yang Bian, Wei Zhong Ding, Ding Sheng Tan

Keywords:

Laterite Nickel Ore, Phase Transformation, Thermodynamic

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