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Supervisor：Jiangxi University Of Science And Technology
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Jiangxi Nonferrous Metals Society
ISSN：1674-9669
CN：36-1311/TF
CODEN YJKYA9
Volume 14 Issue 1
Feb.  2023
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LU Xiongxiong, XIONG Daoling, WEN Mingfu, OUYANG Shaobo, LI Meng, ZHANG Canwen, LIU Yanhong, YANG Jinjuan. Preparation of high-purity ferrous sulfate from NdFeB magnetic material secondary waste slag[J]. Nonferrous Metals Science and Engineering, 2023, 14(1): 30-39. DOI: 10.13264/j.cnki.ysjskx.2023.01.005
Citation: LU Xiongxiong, XIONG Daoling, WEN Mingfu, OUYANG Shaobo, LI Meng, ZHANG Canwen, LIU Yanhong, YANG Jinjuan. Preparation of high-purity ferrous sulfate from NdFeB magnetic material secondary waste slag[J]. Nonferrous Metals Science and Engineering, 2023, 14(1): 30-39. DOI: 10.13264/j.cnki.ysjskx.2023.01.005
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Preparation of high-purity ferrous sulfate from NdFeB magnetic material secondary waste slag

  • Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

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  • Received Date: December 29, 2021
  • Revised Date: April 30, 2022
  • Available Online: March 13, 2023
    Graphical Abstract
    • Abstract
  • A large amount of secondary waste residue is produced after rare earth recovery from NdFeB magnetic waste material. In view of the high iron content in waste residue component, the iron extraction from the waste residue was studied, and the iron was recycled in the form of ferrous sulfate products. In the stage of iron extraction by acid leaching, the effects of acid concentration, extraction temperature, leaching time, liquid-solid ratio (acid volume/waste residue mass), and leaching frequency on iron ion leaching were investigated in detail. The optimal acid leaching process parameters obtained by univariate experiments are acid concentration of 6 mol/L, leaching and extracting temperature of 80 ℃, leaching time of 120 min, liquid-solid ratio (mL/g) of 4∶1 and leaching frequency of 2, under which the leaching rate of iron ions is approximately 97.8%. In the reduction stage, the effects of temperature, reaction time and scrap iron excess coefficient on the conversion of Fe3+ to Fe2+ were investigated. The obtained optimal reduction process parameters are reduction temperature of 90 ℃, reaction time of 120 min, and scrap iron excess coefficient of 1.2, under which the conversion rate of Fe3+ to Fe2+ is 97.69%. Finally, the ferrous sulfate product is obtained by concentration, cooling crystallization and recrystallization, with the purity of 99.92%.
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    • References (27)
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