Removal of Sulfur from CaF2 Containing Desulfurization Slag Exhausted from Secondary Steelmaking Process by Oxidation

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 43; no. 4; pp. 703 - 709
• Main Authors: Hiraki, Takehito, Kobayashi, Junichi, Urushibata, Satomi, Matsubae, Kazuyo, Nagasaka, Tetsuya
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2012; Springer
• Subjects: Applied sciences; Calcium fluoride; Characterization and Evaluation of Materials; Chemistry and Materials Science; Desulfurizing; Exact sciences and technology; Iron and steel making; Materials Science; Metallic Materials; Metals. Metallurgy; Nanotechnology; Oxidation; Process metallurgy; Production of metals; Slags; Structural Materials; Sulfur; Surfaces and Interfaces; Thin Films; Transaction processing; Desulfurization; Sulfur Removal; Fluorine Content; Sulfide Capacity; Sulfur Removability; Exhaust; Removal; Steelmaking; Slag; Oxidation; Calcium fluoride
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-012-9685-8

The oxidation behavior of sulfur in desulfurization slag generated from the secondary steelmaking process with air has been investigated in the temperature range of 973 K to 1373 K (700 °C to 1100 °C). Although a high removal rate of sulfur is not achieved at temperatures lower than 1273 K (1000 °C) because of the formation of CaSO 4 , most of the sulfur is rapidly removed from slag as SO 2 gas in the 1273 K to 1373 K (700 °C to 1100 °C) range. This finding indicates that the desulfurization slag generated from the secondary steelmaking process can be reused as a desulfurized flux through air oxidation, making it possible to reduce significantly the amount of desulfurization slag for disposal.