Method for producing high-purity pure iron

The invention provides a method for producing high-purity pure iron, which comprises the following steps of: (1) preliminary desulphurization of molten iron: controlling the sulphur content of molten iron charged into a revolving furnace at 0.002%-0.015%; (2) smelting of the revolving furnace: dephosphorizing by using the double slag process, tapping slag after dephosphorization, changing slag, controlling C to be less than 0.03% and P to be less than 0.008% at blowing end, carrying out slag-blocked tapping and aluminium deoxidation, and hanging pots at temperature of above 1635 DEG C; (3) slagging off: removing more than 95% of oxidizing slag; (4) RH deep decarburization: controlling RH charging temperature to be above 1615 DEG C, controlling C to be less than 0.002% and Als to be from 0.020% to 0.035% at smelting end, and controlling the discharging temperature to be above 1645 DEG C; (5) LF (Low Frequency) deep decarburization: adding a deep dephosphorizing agent before entering anLF station, stirring with argon gas, adding a slagging constituent after entering the LF station, stirring with a great amount of argon gas, controlling C to be less than 0.0025%, S to be less than 0.0015%, Als to be less than 0.010% and discharging temperature to be from 1600 DEG C to 1605 DEG C; and (6) continuous casting of plate blanks. The invention has the advantages of low production cost and high efficiency; and the purity of the produced product reaches more than 99.9%.