Abstract: In order to solve hot metal loss of skimming after desulphurization, the properties of desulphurization slag and the causes of hot metal loss during slag skimming were analyzed. The feasibility of hot metal gush skimming technology was researched, through water model experiment, thermal state experiment in 500kg top-bottom combined blowing furnace, experiments of cross gas injection gun design and industrial production test in 100t hot metal ladle. It was concluded that the range of hot metal ladle tilting angle range could satisfy two ejection guns vertically inserting into the hot metal; the surface of hot metal was half naked and the other half was covered by "semicircle" desulphurization slag which accumulated at the skimming mouth for skimming easily, with the action of gush power of hot metal bottom-up. Compared with conventional skimming of 100t hot metal ladle, gush skimming time was shortened from 11min to 7min, and hot metal loss was reduced from 5.89t to 2.97t per ladle with no additional slag-conglomerating agent.

Key words: hot metal ladle, skimming, desulphurizing, slag-conglomeration agent