Jinxiang You, Jing Wang, Mingjun Rao, Xin Zhang, Jun Luo, Zhiwei Peng,  and Guanghui Li, An integrated and efficient process for borax preparation and magnetite recovery from soda-ash roasted ludwigite ore under CO–CO2–N2 atmosphere, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp. 2169-2181. https://doi.org/10.1007/s12613-023-2643-4
Cite this article as:
Jinxiang You, Jing Wang, Mingjun Rao, Xin Zhang, Jun Luo, Zhiwei Peng,  and Guanghui Li, An integrated and efficient process for borax preparation and magnetite recovery from soda-ash roasted ludwigite ore under CO–CO2–N2 atmosphere, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp. 2169-2181. https://doi.org/10.1007/s12613-023-2643-4
Research Article

An integrated and efficient process for borax preparation and magnetite recovery from soda-ash roasted ludwigite ore under CO–CO2–N2 atmosphere

+ Author Affiliations
  • Corresponding authors:

    Mingjun Rao    E-mail: mj.rao@csu.edu.cn

    Guanghui Li    E-mail: liguangh@csu.edu.cn

  • Received: 4 January 2023Revised: 31 March 2023Accepted: 4 April 2023Available online: 7 April 2023
  • To realize the comprehensive utilization of ludwigite ore, an integrated and efficient route for the boron and iron separation was proposed in this work, which via soda-ash roasting under CO–CO2–N2 atmosphere followed by grind-leaching, magnetic separation, and CO2 carbonation. The effects of roasting temperature, roasting time, CO/(CO+CO2) composition, and Na2CO3 dosage on the boron and iron separation indices were primarily investigated. Under the optimized conditions of the roasting temperature of 850°C, roasting time of 60 min, soda ash dosage of 20wt%, and CO/(CO+CO2) of 10vol%, 92% of boron was leached during wet grinding, and 88.6% of iron was recovered during the magnetic separation and magnetic concentrate with a total iron content of 61.51wt%. Raman spectra and 11B NMR results indicated that boron exists as ${\rm{B}}({\rm OH})_{4}^{-}$ in the leachate, from which high-purity borax pentahydrate could be prepared by CO2 carbonation.
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