The Thermal Decomposition Characteristics of Sodium Pyroxenite Gangue in Baiyunebo Iron Ore

Abstract:

The changes of physical and chemical properties of sodium pyroxenite gangue such as decomposition and phase transformation were researched by means of differential thermal analysis and X-ray diffraction. The results show that the natural sodium pyroxenite gangue contains the main mineral of aegirite(NaFe⁺³Si₂O₆), and it contains a number of BaSO₄ and Na₃Ca₂(SO₄)₃F, etc. The water of crystallization decomposes at 554.7°C. The Na₃Ca₂(SO₄)₃F decomposes into the composite sulfate and CaF₂ over a wide range of temperatures. The main mineral of aegirite(NaFe⁺³Si₂O₆) reacts with CaF₂ into NaF gas at 993.4°C. The sodium pyroxenite gangue is melts and releases a small amount of SiF₄ gas in the range of 1193.5-1300.7°C.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 939-946
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.939
• Online since: February 2014
• Authors: Guo Ping Luo, Sheng Li Wu, Xiao Long Nie*, Yi Ci Wang, Yue Cong Wang
• Keywords: Baiyunebo Iron Ore, Changes of Physical and Chemical Properties, Sodium Pyroxenite Gangue, Thermal Decomposition

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