Per: RUBIA TEODORO SILVA (TERNIUM BR/UFMG), Aline Lima da Silva (UFMG), Gilvan Nascimento de Souza (tERNIUM BR), Breno Totti Maia (lUMAR METALS), Daniel A.G. de Carvalho (TERNIUM BR)
Abstract:
In order to achieve an efficient Slag Splashing practice, employed for maintenance and repair of LD refractories, slags should present suitable characteristics, with respect to viscosity and solid fraction. In this work, a hybrid methodology was developed, combining defined patterns for slag visual classification, based on a rating criteria, from 1 (low quality) to 3 (high quality), along with thermodynamic simulations carried out on FactSage software for determining phases in the slag, solid fractions as well as effective viscosity. The proposed methodology allows one to identify ideal quadrant for effective viscosity, solid fractions and total iron content, in such a way that high rated slags can be attained, with desired quality for the process. The results show that high quality slags (grade 3), can be obtained under the following conditions: end blow temperature of 1690-1720ºC, effective viscosity from 0.027 to 0.042Pa.s, solids fraction of 13-22% and total iron content from 14 to 17.5%.