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Thermochemical analysis for the reduction behavior of FeO in EAF slag via Aluminothermic Smelting Reduction (ASR) process: Part I. Effect of aluminum on Fe Mn recovery

Title
Thermochemical analysis for the reduction behavior of FeO in EAF slag via Aluminothermic Smelting Reduction (ASR) process: Part I. Effect of aluminum on Fe Mn recovery
Author
박주현
Keywords
Electric arc furnace (EAF) slag; Aluminothermic Smelting Reduction (ASR); Iron recovery; Triangular Fe balance diagram; Reaction mechanism; Thermochemical computation; SOLID CARBON; MOLTEN SLAG; IRON-OXIDE; CAO-SIO2-FEO SLAGS; CHROMIUM-OXIDE; COPPER SLAG; COAL CHAR; GRAPHITE; KINETICS; CR2O3
Issue Date
2017-09
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, v. 58, Page. 219-228
Abstract
We investigated Fe recovery from EAF slag by means of Aluminothermic Smelting Reduction (ASR) at 1773 K, especially the quantitative effect of initial Al/FeO molar ratio upon the Fe recovery. Both calculated and experimentally measured system temperatures continuously increased with increasing initial Al/FeO molar ratio. Furthermore, to predict the reduction behavior we calculated variations in the slag composition by using FactSage (TM) 7.0 software. FeO and Al2O3 contents in molten slag varied sharply within the first 5 min of the reaction and stabilized soon thereafter. The aluminothermic reduction of FeO appeared to proceed rapidly and in good stoichiometric balance, based upon the mass balance between the consumption of FeO and MnO (Delta FeO and Delta MnO) and the production of Al2O3 (Delta Al2O3). Adding an optimal amount of Al (Al/FeO molar ratio 0.8) yielded a Fe recovery of about 90%. Furthermore, the Mn could also be reduced from the EAF slag in the case of excess Al addition (Al/Fe ˃= 0.8). The solid compound spinel (MgO center dot Al2O3) was precipitated from the slag during the FeO reduction, as confirmed by means of XRD analysis and thermochemical computations. Herein, the mechanism of ASR reaction between FeO in molten slag and Al is explained in several steps.
URI
https://www.sciencedirect.com/science/article/pii/S0364591616301778https://repository.hanyang.ac.kr/handle/20.500.11754/72390
ISSN
0364-5916; 1873-2984
DOI
10.1016/j.calphad.2017.02.005
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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