Oxidation of Fayalite in Molten Nickel Slag

doi:10.3103/S1067821220010174

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Oxidation of Fayalite in Molten Nickel Slag
	Ma, Yongbo 1,2; Du, Xueyan 1,2
刊名	RUSSIAN JOURNAL OF NON-FERROUS METALS
	2020-01
卷号	61 期号:1 页码:1-8
关键词	oxidation fayalite nickel slag magnetite silicate
ISSN号	1067-8212
DOI	10.3103/S1067821220010174
英文摘要	This paper investigated the oxidation of fayalite (Fe2SiO4) in iron-rich nickel slag (INS) for iron recycling via an oxidation-magnetic separation method. A phase stability diagram of the FeO-SiO2-MgO-CaO-O-2 system drawn by FactSage 7.1 illustrates that magnetite (Fe3O4) can be crystallized from liquid slag in an air atmosphere, but the further oxidation to Fe2O3 in molten slag was extremely hard. The mass content of divalent iron (w(Fe2+)) decreased and the ratio of trivalent iron to divalent iron (w(Fe3+)/w(Fe2+)) increased gradually with increasing oxidation time. The results show that an air flow rate of 300-500 mL/min, a basicity of 0.90-1.10, and a temperature of 1658-1728 K are conducive to the oxidation of Fe2SiO4 in INS. Fe3O4 is the main iron-bearing phase, and Fe2O3 is not observed in the X-ray diffraction (XRD) patterns. Silicates in the oxidized nickel slag (ONS) are mainly augite (Ca(Mg,Fe)Si2O6), forsterite ((Mg,Fe)(2)SiO4), and monticellite (CaMgSiO4), while akermanite (Ca2MgSi2O7) is observed only for a basicity up to 1.10. The oxidation kinetics of Fe2SiO4 in INS are first order with an apparent activation energy (E-a) of 315.16 kJ/mol.
资助项目	Science and Technology Major Project Plan of Gansu Province[145RTSA004]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	PLEIADES PUBLISHING INC
WOS记录号	WOS:000522169100001
状态	已发表
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/76654]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院研究生院
通讯作者	Du, Xueyan
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou, Peoples R China 2.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Ma, Yongbo,Du, Xueyan. Oxidation of Fayalite in Molten Nickel Slag[J]. RUSSIAN JOURNAL OF NON-FERROUS METALS,2020,61(1):1-8.
APA	Ma, Yongbo,&Du, Xueyan.(2020).Oxidation of Fayalite in Molten Nickel Slag.RUSSIAN JOURNAL OF NON-FERROUS METALS,61(1),1-8.
MLA	Ma, Yongbo,et al."Oxidation of Fayalite in Molten Nickel Slag".RUSSIAN JOURNAL OF NON-FERROUS METALS 61.1(2020):1-8.