Abstract
We propose a novel process to recycle Mn from steelmaking slag. The first step is to sulfurize the slag, producing a liquid sulfide phase (matte) without P. High-purity Fe-Mn alloys can then be made by desulfurizing the matte. However, to our knowledge, there have been no reports to date concerning the sulfurization of P and Mn contained in molten slag. Therefore, knowledge of the distribution of Fe, Mn and P between the matte and the molten slag is required to determine the feasibility of this process. In this study, the equilibrium distributions of Mn, Fe, Ca and P between a FeS-MnS matte and FeO-MnO-SiO 2-MgO-P 2O 5 slag with/without CaO are investigated under controlled partial pressures of oxygen and sulfur. It was found, as P is not present in the matte, that a separation of P from Mn was accomplished. The increament of (CaOCMgO)/SiO 2 in slag can improve the concentrations of Mn and Fe in the matte. The content of Ca in the matte was less than 2 mass%, even when the concentration ratio of CaO/SiO 2 in the slag was unity.
Original language | English |
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Pages (from-to) | 425-434 |
Number of pages | 10 |
Journal | High Temperature Materials and Processes |
Volume | 30 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2011 Aug 1 |
Externally published | Yes |
Keywords
- Activity coefficient
- Distribution
- FeS
- Manganese
- MnS
- P
- P
- Phosphorus
- Recycling
- Separation
- Steelmaking slag
- Sulfurization
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Physical and Theoretical Chemistry