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Effect of Composition on Low-Temperature Soda Roasting of Boron-Rich Blast Furnace Slag

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Abstract

The low-temperature soda roasting method is an emerging method for the extraction of boron from boron-rich blast furnace slag (BRBFS). The effect of the slag composition on the phase changes and boron water leaching rate during the low-temperature soda roasting process of BRBFS is studied in this paper, providing a theoretical basis for the development and adoption of this method. The effects of the mass percentages of Al2O3, CaO, and B2O3 and R (the mass ratio of MgO to SiO2) on the boron water leaching rate were investigated. The phase changes of BRBFS during the low-temperature soda roasting process were studied via X-ray diffraction analysis. The results demonstrate that the water leaching rate of boron increases with increasing Al2O3 content, and the boron-containing compounds precipitate as Ca3B2O6 and NaBO2 in the Na2CO3-modified slag (NMS); NaBO2 was found to be the primary product. With the increase in CaO content, the overall water leaching rate of boron was found to increase. It was found that the relatively high CaO content in BRBFS promoted the presence of boron in the boron-containing amorphous glass phase and ultimately increased the water leaching rate of boron. As the R value increased, it was found that the water leaching rate of boron decreased, and the generated sodium borate phase changes from Na3BO3 to NaBO2. The Ca3B2O6 in NMS can be considered as being composed of two parts: one is that present in BRBFS before roasting, and the other is that generated during the roasting process. With increasing B2O3 content, the water leaching rate of boron initially shows a slight increase before decreasing, and the sodium borate generated transforms from NaBO2 to Na10B4O11 in NMS.

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Acknowledgements

The research leading to these results has received funding from the National Natural Science Foundation of China (Grant No. 52064041) and the Basic Scientific Research Business Cost Project of Universities Directly under the Inner Mongolia Autonomous Region (Grant No. JY20220065).

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Authors and Affiliations

  1. School of Materials Science and Technology, Inner Mongolia University of Technology, Hohhot, 010051, China

    Jie Li & Yan Lu

  2. Yunyangniu Technology Co., LTD., Hohhot, 010051, China

    Ming Guang

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Li, J., Guang, M. & Lu, Y. Effect of Composition on Low-Temperature Soda Roasting of Boron-Rich Blast Furnace Slag. J. Sustain. Metall. 9, 1215–1225 (2023). https://doi.org/10.1007/s40831-023-00725-x

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