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

Ri-jin Cheng; Hong-wei Ni; Hua Zhang; Xiao-kun Zhang; Si-cheng Bai

doi:10.1007/s12613-017-1414-5

Volume 24 Issue 4

Apr. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 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

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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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Research Article

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

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Received: 9 October 2016; Revised: 8 December 2016; Accepted: 13 December 2016

Abstract

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.
- arsenopyrite;
- arsenic removal;
- mechanisms;
- sintering;
- arsenate;
- dearsenication rate

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