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Thermodynamic Behavior of Manganese Oxide in Lime-based Manganese Smelting Slags

Title
Thermodynamic Behavior of Manganese Oxide in Lime-based Manganese Smelting Slags
Author
박주현
Keywords
recovery; activity coefficient; manganese oxide; basicity; structure; SILICATE MELTS; RAMAN-SPECTROSCOPY; GLASSES; EQUILIBRIUM; SYSTEM; IRON; MNO; CHEMISTRY; VISCOSITY; SPECTRA
Issue Date
2016-01
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation
ISIJ INTERNATIONAL, v. 56, No. 1, Page. 37-43
Abstract
The thermodynamic behavior of MnO in the CaO-SiO2-MnO slag system of lower basicity to understand the smelting reduction of silicomanganese was investigated. Experimental results indicated that the activity coefficient of MnO was not affected by MnO content less than 30 mol%. However, it did in fact increase as the MnO content increased beyond 30 mol% because the activity coefficient of MnO is closely associated with the silicate structure. The activity coefficient of MnO also increased with increasing basicity of slag and MgO content because of the free O2- ions that are provided into the slag. On the other hand, the effect of the Al2O3 content on the activity coefficient of MnO was analyzed that the structure in the CaO-SiO2-MnO-Al2O3 system changes from that of a Si-O-Si linkage to that of Si-O-Al and Al-O-Al linkages as the content of Al2O3 increases. Structural considerations concerning the effect of slag composition on the activity coefficient of MnO are discussed in detail using Fourier transform infrared (FT-IR) spectroscopy. Finally, it is shown that manganese recovery can be increased by increasing the activity coefficient of MnO in the slag.
URI
https://www.jstage.jst.go.jp/article/isijinternational/56/1/56_ISIJINT-2015-243/_article/-char/ja/https://repository.hanyang.ac.kr/handle/20.500.11754/102089
ISSN
0915-1559; 1347-5460
DOI
10.2355/isijinternational.ISIJINT-2015-243
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ETC
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