Preparation method of clean steel base stock blank/mother liquor

The invention belongs to the technical field of metallurgy and mainly relates to a preparation method of clean steel base stock blank/mother liquor. The preparation method mainly comprises the following steps that iron concentrate powder or iron-containing oxide is selected according to the product chemical requirements and is controlled to produce sponge iron in a reduction manner through a direct reduction device; the reduction sponge iron is pressed into a block, and the pressed sponge iron is obtained; the pressed sponge iron is smelted, and molten iron is obtained; refining is conducted; deep refining treatment is conducted on C, S and P in the molten iron; and the clean steel base stock black/mother liquor is prepared. According to the preparation method, control reduction is conducted at the temperature of 850 DEG C to 1,200 DEG C by the adoption of a powder metallurgy solid carbon direct reduction process, and the steelmaking and refining processes are completed during direct reduction iron smelting,