Abstract: The paper introduces key technologies of BFBOF interface about hot metal ladle's transportation, accurate weighing, dynamic tracking and
heat preservation in Shougang Jingtang. The multifunctional hot metal ladle technology has been succeeded achieved. The BFBOF interface was simplified，the process route was shorten，the charge weight of hot metal was stable， and the hot metal temperature drop has been decreased. Then the hot metal temperature for desulphurization has been increased, and the thermodynamics conditions for KR desulphurization were created. The mass fraction of sulfur in hot metal at the end of KR treatment can be controlled steadily below 25×10^-6. The favourable conditions for the construction of three D (decarbonization, desulfurization and dephosphorization ) efficient low-cost clean steel production platform have been achieved.

Key words: multi-functional hot metal ladle; , interface, KR desulphurization