ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Carbide Capacity of CaO–SiO2–MnO Slag for the Production of Manganese Alloys
Joo Hyun ParkGeun Ho ParkYoung E. Lee
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2010 Volume 50 Issue 8 Pages 1078-1083


The carbide capacity of the CaO–SiO2–MnO slag, which is the main system produced during Mn alloys processes, through the wide composition region has been measured at 1773 K to understand the effective slag composition on the solubility of carbon in molten slags during SiMn production processes. The carbide capacity is strongly affected by slag composition and this tendency can be reasonably estimated by employing the activity of lime and the activity coefficient of CaC2 as a thermodynamic factors affecting carbide capacity. Considering the high concentration of MnO during SiMn smelting process, the lime to silica ratio of 0.8 (±0.1) is recommended in view of high ability of carbon dissolution. The carbide capacity of the CaO–SiO2–MnO slag can be expressed as a linear function of the activity of lime and the optical basicity. The carbide capacity of the CaO–SiO2–MnO slag increases more significantly than the sulfide capacity does as the basicity of the slag increases.

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© 2010 by The Iron and Steel Institute of Japan
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