Thermodynamic behavior of manganese oxide in lime-based manganese smelting slags

Chang Ho Eom, Sung Hee Lee, Jin Gyun Park, Joo Hyun Park, Dong Joon Min

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalISIJ International
Issue number1
Publication statusPublished - 2016

Bibliographical note

Funding Information:
This work was supported by the third Stage of Brain Korea 21 Plus Project and the Industrial Strategy Technology Development (No. 10033389, Development of e-FERA Technology) through a grant provided by the Ministry of Knowledge Economy.

Publisher Copyright:
© 2016 ISIJ.

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


Dive into the research topics of 'Thermodynamic behavior of manganese oxide in lime-based manganese smelting slags'. Together they form a unique fingerprint.

Cite this