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Metals 2018, 8(9), 714; https://doi.org/10.3390/met8090714

Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO

1,2,3
,
1,2,3,* , 1,2,3
and
1,2,3
1
State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources, Wuhan University of Science and Technology, Wuhan 430081, China
3
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
*
Author to whom correspondence should be addressed.
Received: 17 August 2018 / Revised: 6 September 2018 / Accepted: 6 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue Selected Papers from 8th ICSTI 2018)
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Abstract

According to the coexistence theory of slag structure, a calculation model for the activity of FeO in the quaternary system SiO2-CaO-Al2O3-FeO of depleted copper slag was established. The model was used to calculate and analyze the effects of temperature (T), basicity (B), and Al2O3 content on the activity of FeO (NFeO). The results show that temperature has little impact on NFeO. With increased basicity, NFeO first increased slightly, then increased sharply, and finally decreased. It is easier for CaO to combine with SiO2 than FeO to form calcium silicate, which replaces FeO in 2FeO·SiO2 and increases NFeO. However, when basicity is higher than 2.0, CaO not only reacts with SiO2, but also combines with FeO to form calcium ferrate compounds to decrease NFeO. In addition, the activity of FeO decreases with increased Al2O3 content because of the reaction between CaO and Al2O3. The results can be used as a theoretical basis to guide the carbothermal reduction process of copper slag. View Full-Text
Keywords: copper slag; activity of FeO; calculation model for activity copper slag; activity of FeO; calculation model for activity
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Li, Z.; Ma, G.; Liu, M.; Zou, J. Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO. Metals 2018, 8, 714.

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