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Article

Arsenic Removal from Arsenopyrite-Bearing Iron Ore and Arsenic Recovery from Dust Ash by Roasting Method

by 1,2,3, 1,3,* and 1,*
1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
Technical Center, HBIS Group Hansteel Company, Handan 056001, China
3
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(10), 754; https://doi.org/10.3390/pr7100754
Received: 12 September 2019 / Revised: 11 October 2019 / Accepted: 13 October 2019 / Published: 16 October 2019
(This article belongs to the Special Issue Process Modeling in Pyrometallurgical Engineering)
In most cases, arsenic is an unfavorable element in metallurgical processes. The mechanism of arsenic removal was investigated through roasting experiments performed on arsenopyrite-bearing iron ore. Thermodynamic calculation of arsenic recovery was carried out by FactSage 7.0 software (Thermfact/CRCT, Montreal, Canada; GTT-Technologies, Ahern, Germany). Moreover, the arsenic residues in dust ash were recovered by roasting dust ash in a reducing atmosphere. Furthermore, the corresponding chemical properties of the roasted ore and dust ash were determined by X-ray diffraction, inductively coupled plasma atomic emission spectrometry, and scanning electron microscopy, coupled with energy-dispersive X-ray spectroscopy. The experimental results revealed that the arsenic in arsenopyrite-bearing iron ore can be removed in the form of As2O3(g) in an air or nitrogen atmosphere by a roasting method. The efficiency of arsenic removal through roasting in air was found to be less than that in nitrogen atmosphere. The method of roasting in a reducing atmosphere is feasible for arsenic recovery from dust ash. When the carbon mass ratio in dust ash is 1.83%, the arsenic removal products is almost volatilized and recovered in the form of As2O3(g). View Full-Text
Keywords: arsenopyrite; arsenic removal; mechanism; roasting; arsenate; dust ash; arsenic recovery arsenopyrite; arsenic removal; mechanism; roasting; arsenate; dust ash; arsenic recovery
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MDPI and ACS Style

Cheng, R.; Zhang, H.; Ni, H. Arsenic Removal from Arsenopyrite-Bearing Iron Ore and Arsenic Recovery from Dust Ash by Roasting Method. Processes 2019, 7, 754. https://doi.org/10.3390/pr7100754

AMA Style

Cheng R, Zhang H, Ni H. Arsenic Removal from Arsenopyrite-Bearing Iron Ore and Arsenic Recovery from Dust Ash by Roasting Method. Processes. 2019; 7(10):754. https://doi.org/10.3390/pr7100754

Chicago/Turabian Style

Cheng, Rijin, Hua Zhang, and Hongwei Ni. 2019. "Arsenic Removal from Arsenopyrite-Bearing Iron Ore and Arsenic Recovery from Dust Ash by Roasting Method" Processes 7, no. 10: 754. https://doi.org/10.3390/pr7100754

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