当前位置: X-MOL 学术Russ. J. Non-ferrous Metals › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Oxidation of Fayalite in Molten Nickel Slag
Russian Journal of Non-Ferrous Metals ( IF 0.6 ) Pub Date : 2020-03-29 , DOI: 10.3103/s1067821220010174
Yongbo Ma , Xueyan Du

Abstract

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–O2 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)2SiO4), 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 (Ea) of 315.16 kJ/mol.


中文翻译:

铁镍矿在熔融镍渣中的氧化

摘要

本文通过氧化-磁分离法研究了富铁镍渣(INS)中铁橄榄石(Fe 2 SiO 4)的氧化过程,以循环利用铁。由FactSage 7.1绘制的FeO–SiO 2 –MgO–CaO–O 2系统的相稳定性图说明,磁铁矿(Fe 3 O 4)可以在空气中从液态炉渣中结晶出来,但会进一步氧化成Fe 2 O 3在熔渣中非常坚硬。二价铁(w(Fe 2+))的质量含量降低,三价铁与二价铁的比例(w(Fe 3+)/ w(Fe 2+))随着氧化时间的增加而逐渐增加。结果表明,空气流速为300–500 mL / min,碱度为0.90–1.10,温度为1658–1728 K有助于INS中Fe 2 SiO 4的氧化。Fe 3 O 4是主要的含铁相,在X射线衍射(XRD)图中未观察到Fe 2 O 3。氧化镍渣(ONS)中的硅酸盐主要是钠铁矿(Ca(Mg,Fe)Si 2 O 6),镁橄榄石((Mg,Fe)2 SiO 4)和蒙脱石(CaMgSiO 4),而钙钛矿(Ca 2 MgSi 2仅在不超过1.10的碱度下才能观察到O 7)。在INS中Fe 2 SiO 4的氧化动力学是一级的,表观活化能(E a)为315.16 kJ / mol。
更新日期:2020-03-29
down
wechat
bug