The invention discloses a method for synchronously desulphurizing
molten steel and
slag of a non-oriented
silicon steel RH vacuum oven. The method mainly comprises the following steps:
molten steel pretreatment (a KR method), converter
smelting and RH vacuum refining, wherein the RH vacuum refining comprises the steps of carrying out vacuumizing and decarbonization on RH entering a
station, after the decarbonization of RH is finished, adding a low-
carbon steel slag surface deoxidant into the surface of the steel
slag, simultaneously carrying out steel
ladle bottom blowing to promote the reduction of the low-
carbon steel slag surface deoxidant to steel
ladle slag, after the low-
carbon steel slag surface deoxidant is added, adding
metal aluminum,
silicon iron and
manganese metal into
molten steel, carrying out
deoxygenation and alloying, carrying out circular
processing for 4-7 minutes, adding a desulphurizing agent in different stages, simultaneously adjusting the steel
ladle bottom blowing flow to promote slag-
metal reaction to realize desulphurization, carrying out desulphurizing molten steel by virtue of the desulphurizing agent and the steel ladle slag so as to improve the desulphurization efficiency, after the desulphurization is finished, carrying out clean circulation for more than 8 minutes, and carrying out vacuum breaking and steel tapping. The
sulfur content of an RH end point is less than 30ppm, and the standardized rate is increased from original about 22% to 95% or above.