Kinetic Investigations of SiMn Slags From Different Mn Sources

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2018-06, Vol.49 (3), p.1185-1196
• Main Authors: Kim, Pyunghwa Peace, Tangstad, Merete
• Format: Article
• Language: English
• Subjects: Atmospheric models; ATMOSPHERIC PRESSURE; CARBON MONOXIDE; Characterization and Evaluation of Materials; Charge materials; Chemistry and Materials Science; IRON; MANGANESE; MANGANESE OXIDES; MATERIALS SCIENCE; Materials selection; Metallic Materials; Metallurgy; Nanotechnology; ORES; RAW MATERIALS; REACTION KINETICS; REDUCTION; Silicomanganese; Silicon dioxide; SILICON OXIDES; Slag; SLAGS; Structural Materials; SULFUR; Surfaces and Interfaces; THERMAL GRAVIMETRIC ANALYSIS; Thermogravimetric analysis; Thin Films
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-018-1238-3

The kinetics of MnO and SiO 2 reduction were investigated for Silicomanganese (SiMn) slags using a Thermogravimetric analysis (TGA) between 1773 K and 1923 K (1500 °C and 1650 °C) under CO atmospheric pressure. The charge materials were based on Assmang ore and HC FeMn Slag. Rate models for MnO and SiO 2 reduction were applied to describe the metal-producing rates, as shown by the following equations: r MnO = k MnO × A × a MnO - a Mn K T r SiO 2 = k SiO 2 × A × a SiO 2 - a Si K T . The results show that the choice of raw materials in the charge considerably affected the reduction rate of MnO and SiO 2 . The highest reduction rate was found to be from charges using HC FeMn slag. The difference in the driving forces was insignificant among the SiMn slags, and the similar slag viscosities could not explain the different reduction rates. Instead, the difference is attributed to small amounts of sulfur and the amount of iron in the charge. In addition, the rate models were applicable to describe the reduction of MnO and SiO 2 in SiMn slags.