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Hexagonal hematite platelets synthesized from pyrite cinders by hydrothermal process

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Abstract

Well-crystallized hexagonal hematite (α-Fe2O3) platelets were synthesized by hydrothermal process, using a highly concentrated ferric hydroxide as precursor. The precursor was prepared by adding ammonia to the ferric sulfate solution which was obtained by leaching pyrite cinders with sulfuric acid. Structure and morphology of the synthesized products were investigated by X-ray diffraction, scanning electron microscope, transmission electron microscope and selected area electron diffraction. The results reveal that the reaction temperature has significant effects on the structure, size and shape of the synthesized hematite particles. Typical hexagonal hematite platelets, about 0.4–0.6 μm in diameter and 0.1 μm in thickness, were prepared at 230 °C for 0.5 h. Al3+, contained in the sulfuric acid leaching solution as an impurity, plays an extremely important role in the formation of hexagonal hematite. In addition, a possible mechanism about the formation of hexagonal hematite platelets was proposed.

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Authors and Affiliations

  1. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China

    Zhao-cheng Liu  (刘昭成) & Ya-jie Zheng  (郑雅杰)

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  1. Zhao-cheng Liu  (刘昭成)
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  2. Ya-jie Zheng  (郑雅杰)
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Correspondence to Ya-jie Zheng  (郑雅杰).

Additional information

Foundation item: Project(2008A090300016) supported by the Key Science and Technology Item of Guangdong Province, China; Project(ZKJ2010022) supported by the Precious Apparatus Opening Center Foundation of Central South University, China

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Liu, Zc., Zheng, Yj. Hexagonal hematite platelets synthesized from pyrite cinders by hydrothermal process. J. Cent. South Univ. Technol. 18, 1377–1382 (2011). https://doi.org/10.1007/s11771-011-0849-5

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  • DOI: https://doi.org/10.1007/s11771-011-0849-5

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