Mechanism research on arsenic removal from arsenopyrite ore during a sintering process
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第4期
论文作者：Ri-jin Cheng Hong-wei Ni Hua Zhang Xiao-kun Zhang Si-cheng Bai
文章页码：353 - 359
摘 要：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 Fe As S reacted with excess oxygen to generate Fe AsO4,and the rest of the Fe As S 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 Fe As S 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.
Ri-jin Cheng，Hong-wei Ni，Hua Zhang，Xiao-kun Zhang，Si-cheng Bai
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology
摘 要：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 Fe As S reacted with excess oxygen to generate Fe AsO4,and the rest of the Fe As S 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 Fe As S 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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