METHOD FOR PROLONGING LIFETIME OF REFRACTORY FOR MOLTEN METAL CERAMIC FURNACE

摘要

PROBLEM TO BE SOLVED: To suppress wear of refractory by applying an ultrasonic vibration of a specified range to the refractory through an actuator fixed directly thereto. ;SOLUTION: A 20 kHz, 500 W ultrasonic wave generator is fixed under a tundish 11 having molten steel processing capacity of 100 t and abnormal melting loss of powder line is eliminated by vibrating an immersed nozzle 10 itself. Three 500 kHz, 100 W ultrasonic wave generators are fixed, along with a built-in power supply, to the slag line of a ladle having molten steel processing capacity of 250 t. The horn section of the ultrasonic wave generator incorporates a piezoelectric element using barium titanate and melting loss is eliminated by performing forced air cooling using an air cooling fan. Lifetime of molten metal 5 can thereby be prolonged on the inner surface of a ceramic furnace.;COPYRIGHT: (C)1999,JPO