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VERSION:2.0
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 17a
SUMMARY:Target FeOx in the converter slag for increasing the lime dissolution
DESCRIPTION:Lime is added during the converter process to remove phosphorus from steel. At the end of the converter process, some heats were found to contain undissolved lime, especially, the low phosphorous aim grades. The undissolved lime issue can be due to insufficient time after flux additions before the slag is tapped, formation of C3S/C2S layer on top of CaO flux which prevents further dissolution, and flux reach saturation limit which prevents further dissolution. One way to increase the lime dissolution is to increase the FeO content locally during the converter process. Dolomite is also added to the converter slag to control the MgO-C refractory dissolution by aiming right MgO-saturation level.
Thermodynamic studies were performed using FactSage to  determine “minimum FeO” content required within the converter slag which dissolves all lime that is added during the process. And, to determine the “minimum MgO” content required during converter slag to reach the MgO saturation level. The assumption in the current work is the fast kinetics of transfer of solid lime and dolomite to liquid slag when fluxes are added. 
FactSage-Macro function was used for determining the lime and MgO saturation limit for ~15,000 synthetic slag compositions within a specific range of composition and temperature. Regression formulas was then developed using the FactSage calculations which can calculate the “minimum FeO” and “minimum MgO” content for any given slag composition and temperature within that range. The formula will help design the local slag composition to avoid the undissolved lime issue and MgO-saturation level of the converter process.

CLASS:PUBLIC
DTSTART:20230614T110000
DTEND:20230614T112000
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