STEAM SPALLING POTENTIAL OF PARTIAL MONOLITHIC REFRACTORY REPAIRS

摘要

The implementation of partial refractory repairs is increasing in an effort to reduce refractory costs and minimize down time. Traditional dry out procedures and schedules have been developed historically based upon all new construction. The guidelines are conservative in nature and have been developed over time to ensure spall free dry outs. The curing and drying of repair monolithic linings in the presence of existing refractories that have been in service presents a new set of complications that must be considered to successfully dry the repair material. This requires the evacuation of water through the cold face and the potential interactions of the new cast repair refractory with the existing altered refractory surface. A case study of both cement bonded and phosphate bonded repair materials in the hearth of aluminum furnaces will be presented to illustrate the potential variables that must be considered when making a repair and establishing a dry out schedule.