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

被引:24
|
作者
Cheng, Rijin [1 ,2 ,3 ]
Zhang, Hua [1 ,3 ]
Ni, Hongwei [1 ]
机构
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China
[2] Hansteel Co, HBIS Grp, Tech Ctr, Handan 056001, Peoples R China
[3] Wuhan Univ Sci & Technol, Key Lab Ferrous Met & Resources Utilizat, Minist Educ, Wuhan 430081, Hubei, Peoples R China
关键词
arsenopyrite; arsenic removal; mechanism; roasting; arsenate; dust ash; arsenic recovery; GRAIN-BOUNDARY SEGREGATION; COPPER; TEMPERATURE; MECHANISM;
D O I
10.3390/pr7100754
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
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).
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页数:12
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