Dephosphorization method for oxygen top-blown converter slag remainder

• Main Authors: ZHENG HU, LIU SHANXI, LIN WENLONG, ME HONGYONG, HAO HUAQIANG, ZHANG HUCHENG, WANG ZHENGANG, CHEN JIANJUN, CHANG FENG, LI SHUO, WANG WENHUI, SUN YUXIA, XIANG YOUBING
• Format: Patent
• Language: Chinese; English
• Published: 16.11.2016
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

The invention discloses a dephosphorization method for oxygen top-blown converter slag remainder. The dephosphorization method includes the steps that before slag-splashing for protection of a converter, a dephosphorization agent is added to the slag remainder in the converter after tapping, then inert gases are top-blown by an oxygen gun for the operation of slag-splashing for protection of the converter, and dephoshprized slag remainder serve as initial slag of the next melt of smelting. According to the method, the oxygen top-blown converter slag remainder operation is combined with the slag remainder dephosphorization process, the phosphorus content in the slag remainder can be lowered effectively, and the drag-in amount of phosphorus in the next melt of converter smelting process is lowered, so that the lime addition amount in the next melt of converter smelting process can be reduced, and the converter smelting cost is lowered. By the adoption of the dephosphorization method, part of the phosphorus elem