Cart Summary
0 item(s) ($0.00)
Product Search
All Products
AIST Transactions
Books
Conference Proceedings
Industry Data
Iron & Steel Technology
About the AIST Resource Center
Product Details:

Use of CaO-Al2O3 Synthetic Slag on EAF Tapping for Steel Desulfurization

Steel desulfurization is usually performed by CaO-Al2O3-based top slags. However, in the steelmaking process at a steel mill in the city of Cariacica, ES, Brazil, deoxidation is carried out on tapping with the addition of ferrosilicon-manganese and silicon carbide, and desulfurization is carried out in the ladle furnace with the addition of lime and calcium carbide. The present work aims to change this process by adding a CaO-Al2O3 system slag during the electric arc furnace (EAF) steel tapping, so that the desulfurization occurs already in this step, thus enabling CaC2 economy in the ladle furnace. Three lime/alumina briquette ratios were determined, where the CaO activity, liquid slag ratio and viscosity were analyzed. Then, the desulfurization yields of these heats were compared to the conventional route. The influence of additions and of the slag carryover on desulfurization efficiency was analyzed by correlation charts and a mathematical model developed. It was found that the slag carryover from the EAF impairs the desulfurization, causing sulfur reversion from tapping until the ladle furnace arrival, and decreasing the desulfurization rate on the ladle furnace treatment by promoting high-equilibrium sulfur content, close to the real reached value. The most efficient slags were the ones with the greatest calcium oxide activities, which is in line with the steel desulfurization factor.
Product:
2024/07 AIST Iron & Steel Technology July
PR-PM0724-3
Lucas da Silva Renato, Raphael Mariano de Souza, Victor dos Santos Dagostini, Estefano Vieira, et al
July 01, 2024
PDF
$25.00
$35.00
$35.00
Available for Immediate Download