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Selective precipitation and non-isothermal crystallization kinetics of britholite from low grade ree-bearing slag

Journal of Rare Earths 2023年第11期41卷 1812-1818,I0006页

作者： Zhuang Ma Zengwu Zhao Xingqi Guo Wentao Guo School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010China Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou014010China Inner Mongolia Autonomous Regional Engineering Technology Research Center of Sustainable Exploitation of Rare Earth Secondary Resources Inner Mongolia University of Science and TechnologyBaotou014010China

In order to improve the recovery rate of rare earth,the effect of P_(2)O_(5) and cooling rate on the selective precipitation of CaO-SiO_(2)-TiO_(2)-P_(2)O_(5)-Nb_(2)O_(5)-CeO_(2)-CaF_(2) slag system was explored using X-ray powder diffraction,a scanning electron microscope,an electron probe micro-analyzer and a confocal laser scanning *** apatite(Ca_(2.02)Ce_(7.98)Si_(6.00)O_(26.00))is tiny and difficult to be separated from the slag without P_(2)O_(5).When the addition of P_(2)O_(5) is 6 wt%-10 wt%,the cerium and phosphorus are found to be enriched in britholite(Ca_(5-x)Ce_(x)[(SiO_(4))_(x)(PO_(4))_(3-x)]F)phase while x is negatively correlated with P_(2)O_(5) content in the *** influence of P_(2)O_(5) and cooling rate on the non-isothermal crystallization kinetics was also *** the cooling rate between 5 and 40℃/min,continuous cooling transformation diagram of britholite was constructed when the P205 content is between 6 wt%-10 wt%.The modified Avrami model was applied to determine the crystallization mode of slag with 10 wt%P_(2)O_(5).It is shown that the crystallization mode is diffusion-controlled with constant nucleation rate and one-dimensional *** consideration of quantity and volume of crystals,the reasonable cooling rate is between 10and 30℃/min.

关键词： P_(2)O_(5) Crystallization Kinetics low grade ree-bearing slag Rare earths

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