Investigation into the Function of Zero-Valent Iron (ZVI) in the Process of Fayalite Formation

被引：7

作者：

Wang, Dawei ^{[1
]}

Peng, Ning ^{[1
]}

Zhao, Zongwen ^{[1
]}

Peng, Bing ^{[1
]}

Wang, Zhongbing ^{[2
,3
]}

Gong, Dandan ^{[4
]}

机构：

[1] Cent South Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

[2] Nanchang Hangkong Univ, Sch Environm & Chem, Nanchang 330063, Jiangxi, Peoples R China

[3] Natl Local Joint Engn Res Ctr Heavy Met Pollutant, Nanchang 330063, Jiangxi, Peoples R China

[4] Jiangxi Univ Sci & Technol, Sch Resources & Environm Engn, Ganzhou 341000, Peoples R China

来源：

JOM | 2020年 / 72卷 / 07期

基金：

中国国家自然科学基金;

关键词：

RAY PHOTOELECTRON-SPECTROSCOPY; SOLID-STATE REACTION; NANOCRYSTALLINE FAYALITE; SULFIDATION BEHAVIOR; FORMATION MECHANISM; COPPER SLAG; ZINC; GLASS; IMMOBILIZATION; VITRIFICATION;

D O I：

10.1007/s11837-020-04182-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fayalite is widely used in various fields based on its structural characteristics and only exists in weak reducing environments. Excess ZVI (zero-valent iron) is used to regulate oxygen fugacity when synthesizing fayalite. This paper investigates the function of ZVI during the formation of fayalite. The results indicate that ZVI plays two main roles: it is used as an oxygen scavenger to keep the atmosphere in a weakly reduced state and it is used as a reducing agent to reduce Fe3+ to Fe2+, which produces an Fe1-alpha O intermediate. The formation of Fe1-alpha O is a critical step in Si-O-Fe formation. The XPS and XRD results not only provide proof of this process but also indicate that fayalite formation is actually an exchange process between Fe(II) and Si(IV). These data provide theoretical support for basic research on copper slag and other research related to fayalite.

引用

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页码：2721 / 2729

页数：9

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