Oxidation of Fayalite in Molten Nickel Slag

doi:10.3103/S1067821220010174

	Oxidation of Fayalite in Molten Nickel Slag
	Ma, Yongbo 1,2; Du, Xueyan1,2
	2020-01
发表期刊	RUSSIAN JOURNAL OF NON-FERROUS METALS
ISSN	1067-8212
卷号	61 期号:1 页码:1-8
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.
关键词	oxidation fayalite nickel slag magnetite silicate
DOI	10.3103/S1067821220010174
收录类别	SCI
语种	英语
资助项目	Science and Technology Major Project Plan of Gansu Province[145RTSA004]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000522169100001
出版者	PLEIADES PUBLISHING INC
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://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, Sch Mat Sci & Engn, Lanzhou, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou, Peoples R China
第一作者单位	材料科学与工程学院; 省部共建有色金属先进加工与再利用国家重点实验室
通讯作者单位	材料科学与工程学院; 省部共建有色金属先进加工与再利用国家重点实验室
第一作者的第一单位	材料科学与工程学院
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.