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Boron isotope geochemistry of borate and magnesite deposits in eastern Liaoning and Jilin Provinces of China
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
S.-Y. Jiang, P. Ni, H.-F. Ling, Y.-H. Jiang
The borate and magnesite deposits are hosted in the lower and upper portions of the Lower Liaohe Group, respectively, which is composed of an early Proterozoic volcanic-sedimentary sequence exposed along a NE-SW striking belt of ∼300 km long in Laioning and Jilin Provinces, northeastern China. The lower portion of the Lower Liaohe Group comprises the boron-bearing series in ascending order of magnetite-microcline rock, biotite-quartz-feldspar rock, Mg-silicate rock intercalated with magnesite marble (that is the exclusive host of the borate ores), and overlain tourmaline-bearing biotite-quartz-albite rock. Large borate deposits in the area include Houxianyu, Wengquangou, and Zhuanmiao deposits. The major boron ore minerals are suanite (Mg2B2O5), szaibelyite (Mg2B2O5 H2O), and ludwigite ((Fe,Mg)4Fe2B2O10). Tourmalines are widespread in the deposits.
Study on microwave-assisted grinding and liberation characteristics for Ludwigite
Published in Journal of Microwave Power and Electromagnetic Energy, 2021
Low-grade ludwigite is obtained from Fengcheng Chemical Group Co., Ltd., China. Size fractions of the ore samples were prepared by crushing and sieving. The chemical compositions of the ore are given in Table 1. The ore mainly comprised 8.03% B2O3, 28.53% Fe2O3 and 29.98% TFe as valuable components. The content of MgO and SiO2, as the main gangue components, was 26.88% and 12.22%, respectively. A minor amount (less than 1%) of Al2O3, CaO and S was present. Further, magnetite (Fe3O4), ascharite (MgBO2(OH)) and serpentine (Mg3Si2O5(OH)4) were the main mineralogical phases in ludwigite. They were detected using an automatic mineral parameter analysis system in MLA and X-ray diffraction pattern of the ore, as shown in Table 2 and Figure 1.