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Volume 24 Issue 4
Apr.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(4): 353-359
Ri-jin Cheng, Hong-wei Ni, Hua Zhang, Xiao-kun Zhang, and Si-cheng Bai, Mechanism research on arsenic removal from arsenopyrite ore during a sintering process, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 353-359. https://doi.org/10.1007/s12613-017-1414-5
Cite this article as:
Ri-jin Cheng, Hong-wei Ni, Hua Zhang, Xiao-kun Zhang, and Si-cheng Bai, Mechanism research on arsenic removal from arsenopyrite ore during a sintering process, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 353-359. https://doi.org/10.1007/s12613-017-1414-5
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研究论文

Mechanism research on arsenic removal from arsenopyrite ore during a sintering process

  • Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China

  • The mechanism of arsenic removal during a sintering process was investigated through experiments with a sintering pot and arsenic-bearing iron ore containing arsenopyrite; the corresponding chemical properties of the sinter were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS). The experimental results revealed that the reaction of arsenic removal is mainly related to the oxygen atmosphere and temperature. During the sintering process, arsenic could be removed in the ignition layer, the sinter layer, and the combustion zone. A portion of FeAsS reacted with excess oxygen to generate FeAsO4, and the rest of the FeAsS reacted with oxygen to generate As2O3(g) and SO2(g). A portion of As2O3(g) mixed with Al2O3 or CaO, which resulted in the formation of arsenates such as AlAsO4 and Ca3(AsO4)2, leading to arsenic residues in sintering products. The FeAsS component in the blending ore was difficult to decompose in the preliminary heating zone, the dry zone, or the bottom layer because of the relatively low temperatures; however, As2O3(g) that originated from the high-temperature zone could react with metal oxides, resulting in the formation of arsenate residues.
    • Research Article

    Mechanism research on arsenic removal from arsenopyrite ore during a sintering process

    + Author Affiliations
      Abstract
    • The mechanism of arsenic removal during a sintering process was investigated through experiments with a sintering pot and arsenic-bearing iron ore containing arsenopyrite; the corresponding chemical properties of the sinter were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS). The experimental results revealed that the reaction of arsenic removal is mainly related to the oxygen atmosphere and temperature. During the sintering process, arsenic could be removed in the ignition layer, the sinter layer, and the combustion zone. A portion of FeAsS reacted with excess oxygen to generate FeAsO4, and the rest of the FeAsS reacted with oxygen to generate As2O3(g) and SO2(g). A portion of As2O3(g) mixed with Al2O3 or CaO, which resulted in the formation of arsenates such as AlAsO4 and Ca3(AsO4)2, leading to arsenic residues in sintering products. The FeAsS component in the blending ore was difficult to decompose in the preliminary heating zone, the dry zone, or the bottom layer because of the relatively low temperatures; however, As2O3(g) that originated from the high-temperature zone could react with metal oxides, resulting in the formation of arsenate residues.
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