The invention provides a method for
smelting high-
carbon steel from semi-steel. The method adopts the semi-steel after extraction of
vanadium as a
raw material, and comprises the following steps of: adopting a low
vanadium extraction process during
smelting of a
vanadium extraction converter to ensure that the carbon content of the semi-steel after the extraction of vanadium is not smaller than 3.70 weight percent, and the temperature of the semi-steel is not lower than 1,290 DEG C; adding active
lime into the converter according to a standard of 10 to 15 kg in a
ton of steel, adding high-
magnesium lime into the converter according to a standard of 7 to 10 kg in a
ton of steel, shaking the converter back and forth to ensure that the active
lime and the high-
magnesium lime are uniformly mixed with steel
slag in the converter, then adding the semi-steel into the converter, and adding a ferro-
silicon alloy into the converter, wherein the added amount of the ferro-
silicon alloy can ensure that the initial
alkalinity of furnace
slag is 2 to 3; performing converting, and pouring out the furnace
slag when the temperature of a
molten pool is raised to be 1,400 to 1,500 DEG C; adding active lime into the converter according to a standard of 12 to 18 kg in a
ton of steel and adding high-
magnesium lime into the converter according to a standard of 9 to 12 kg in a ton of steel to perform secondary slagging; performing converting, and adding manganiferous
iron ore into the converter to ensure that the
alkalinity of the furnace slag is 4 to 5 and a CaO-SiO2-FeO-MnO low-melting-point slag
system is formed; adding a cooling agent into the converter after converting for 3 to 5 minutes, and continuously converting until target
molten steel and terminal furnace slag are obtained; and tapping. According to the method, dephophorization and carbon maintenance can be realized at the same time.