A method for slagging in ladle furnace refining of liquid steel

By optimizing the addition of raw dolomite and the control of bottom-blown argon in LF refining, the problems of high cost, instability and energy waste in the application of raw dolomite were solved, achieving low-cost and efficient steel purity and inclusion removal, thus improving steel quality.

CN122256602APending Publication Date: 2026-06-23SHANDONG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG IRON & STEEL CO LTD
Filing Date
2026-04-15
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The application of raw dolomite in the existing LF refining process has problems such as high cost, unstable process, energy waste, excessive hydrogen content in molten steel and poor removal of inclusions, which affect steel quality and production efficiency.

Method used

After tapping steel from the ladle, raw dolomite is added and the flow rate of bottom-blown argon is controlled. The residual heat of the ladle is used to decompose the raw dolomite. Combined with appropriate particle size and drying treatment, the amount and timing of adding raw dolomite and lime are optimized to form a stable refining slag, thereby improving the desulfurization effect and the removal rate of inclusions.

Benefits of technology

It reduces production costs and power consumption, improves the purity of molten steel and operational stability, reduces the risk of splashing, and enhances the removal of inclusions and the quality of steel.

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Abstract

This invention belongs to the field of iron and steel metallurgical refining technology, and particularly relates to a slag-forming method for LF refining of molten steel. The method involves adding dried, appropriately sized raw dolomite in batches before and after tapping, which avoids slag splashing and drastic fluctuations in molten steel caused by a sudden increase in CO2. The drying process effectively reduces the risk of excessive hydrogen content in the molten steel. Simultaneously, bottom-blown argon promotes the upward movement of generated CO2, which in turn promotes the upward movement of inclusions in the molten steel, improving inclusion removal efficiency. This method achieves efficient utilization of raw dolomite, reduces refining costs, and simultaneously improves steel purity and refining operation stability. This method fully utilizes raw dolomite to replace part of the refining slag, reducing slag cost per ton of steel and calcination energy consumption. It optimizes the timing of slag addition and the bottom-blown argon system, improves raw dolomite utilization, stabilizes refining operations, and simultaneously enhances steel purity and production economics.
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