METHOD FOR MEASURING THICKNESS OF SLAG AND METHOD FOR DESULFURIZING MOLTEN STEEL USING NOISE VALUE

• Main Authors: SEOL, DONG IL, JO, SOON TAEK, JU, IN HO, KIM, JONG GYUN
• Format: Patent
• Language: English; Korean
• Published: 01.07.2009
• Subjects: BLASTING; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FURNACES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; KILNS; LIGHTING; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; OVENS; PHYSICS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; RETORTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TESTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; WEAPONS

A slag thickness measuring method and a desulfurization method of molten steel are provided to enhance desulfurization efficiency in LF and reduce the desulfurization time by confirming the sulfur concentration quickly. A slag thickness measuring method, when inserting a three-phrase electrode rod in the molten steel covered with slag and raising the molten steel temperature using arcing heat, comprises a step of measuring a noise generated from the insertion of the three-phrase electrode rod, and a step of measuring the slag thickness using the measured noise value. The slag thickness is evaluated as 270~300mm when the noise value is 95dB or less, 240~270mm at 95~97dB, 220~240mm at 98~101dB, 140~220mm at 102~104dB, and 140mm at more than 104dB.