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Extraction of Boron from Ludwigite Ore: Mechanism of Soda-Ash Roasting of Lizardite and Szaibelyite

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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Minerals 2019, 9(9), 533; https://doi.org/10.3390/min9090533
Received: 30 July 2019 / Revised: 30 August 2019 / Accepted: 30 August 2019 / Published: 31 August 2019
(This article belongs to the Special Issue Cleaner Production in Mineral Processing)
Ludwigite ore is a typical low-grade boron ore accounting for 58.5% boron resource of China, which is mainly composed of magnetite, lizardite and szaibelyite. During soda-ash roasting of ludwigite ore, the presence of lizardite hinders the selective activation of boron. In this work, lizardite and szaibelyite were prepared and their soda-ash roasting behaviors were investigated using thermogravimetric-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), and scanning electron microscope and energy dispersive spectrometer (SEM-EDS) analyses, in order to shed light on the soda-ash activation of boron within ludwigite ore. Thermodynamics of Na2CO3-MgSiO3-Mg2SiO4-Mg2B2O5 via FactSage show that the formation of Na2MgSiO4 was preferential for the reaction between Na2CO3 and MgSiO3/Mg2SiO4. While, regarding the reaction between Na2CO3 and Mg2B2O5, the formation of NaBO2 was foremost. Raising temperature was beneficial for the soda-ash roasting of lizardite and szaibelyite. At a temperature lower than the melting of sodium carbonate (851 °C), the soda-ash roasting of szaibelyite was faster than that of lizardite. Moreover, the melting of sodium carbonate accelerated the reaction between lizardite with sodium carbonate. View Full-Text
Keywords: boron; ludwigite; soda ash roasting; szaibelyite; lizardite boron; ludwigite; soda ash roasting; szaibelyite; lizardite
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Zhang, X.; Li, G.; You, J.; Wang, J.; Luo, J.; Duan, J.; Zhang, T.; Peng, Z.; Rao, M.; Jiang, T. Extraction of Boron from Ludwigite Ore: Mechanism of Soda-Ash Roasting of Lizardite and Szaibelyite. Minerals 2019, 9, 533.

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