Hot metal desulphurising: Redesigning the hot metal ladle lining at the Corus IJmuiden BOS plant no.2

摘要

The transfer of hot metal desulphurising from the torpedo cars to the hot metal ladles at the Umuiden BOS plant no.2 caused a decrease in ladle lining life from 680 to 470 heats. Changing the desulphurising agent CaC2 for CaO during a trial period, for environmental reasons, led to a further decrease in refractory life. Availability of the ladles became critical and the major reasons for the low life were identified. Solving one of them, temperature, quickly resulted in restoration of the original lives. However, re-introduction of the new desulphurising agent on 50 percent of the heats again resulted in a decrease, this time from 700 to 550 heats. In order to be prepared for the full introduction of the new agent, thorough investigation of worn linings was conducted. The investigation revealed the major (chemical) wear mechanisms and with these findings, a new design for the hot metal ladle was proposed. The initial trial results with the new ASC lining are promising.