The invention is suitable for the technical field of steel and iron
smelting and provides a technology for KR
liquid iron pretreatment desilicication and dephosphorization. A desilicication agent formed by mixing 90% of oxidized scale and 10% of white ash is added into
liquid steel, the matter of FeO and Fe2O3 contained in the oxidized scale and white ash are used for generating a
chemical reaction with Si in
liquid iron under the high-temperature condition of 1150 DEG C to 1400 DEG C, SiO2 is generated to enter
slag, Fe is generated to enter the
liquid iron, and the purpose of reducing the
silicon content of the liquid iron is achieved; and meanwhile, after the
silicon in the liquid iron is lower than 0.2%, a dephosphorization agent formed by mixing 55% of oxidized scale, 35% of white ashand 10% of
fluorite powder is added into the liquid iron,
phosphorus in the liquid iron can generate a
chemical reaction with FeO and CaO contained in the dephosphorization agent,
phosphorus is oxidized and forms a stable compound (4CaO.P2O2) with CaO to enter the
slag, normal
smelting production of a converter is achieved, production of certain low-
phosphorus steel balls is achieved, consumptionof steel and iron materials is reduced, and considerable
economic benefits are created.