METHOD FOR PROLONGING LIFETIME OF REFRACTORY FOR MOLTEN METAL CERAMIC FURNACE

• Main Authors: TERAJIMA HIDETOSHI, ISHII AKIO
• Format: Patent
• Language: English
• Published: 29.10.1999
• Edition: 6
• Subjects: BLASTING; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FOR PERFORMING MECHANICAL WORK IN GENERAL; FURNACES; GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL; HEATING; KILNS; LIGHTING; MECHANICAL ENGINEERING; METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY; OVENS; PERFORMING OPERATIONS; POWDER METALLURGY; RETORTS; TRANSPORTING; WEAPONS

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.