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

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....

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Bibliographic Details
Published in:JOM (1989) 2020-07, Vol.72 (7), p.2721-2729
Main Authors: Wang, Dawei, Peng, Ning, Zhao, Zongwen, Peng, Bing, Wang, Zhongbing, Gong, Dandan
Format: Article
Language:English
Subjects:
Atmosphere
Chemistry/Food Science
Copper
Earth Sciences
Engineering
Environment
Experiments
Fayalite
Fugacity
Iron
Metallurgy
Methods
Nitrogen
Physics
Quartz
Raw materials
Recycling Silicon and Silicon Compounds
Reducing agents
Solid solutions
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Summary: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 Fe 3+ to Fe 2+ , which produces an Fe 1− α O intermediate. The formation of Fe 1− α 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.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-020-04182-9