Abstract: The practice of dephosphorization process with duplex melting with a single converter in Sansteel Minguang Co., Ltd., Fujian was introduced. The average dephosphorization rate was up to 67.3 % in the case of  blowing oxygen intensity 2.0~2.7 m³/(t·min), average blowing time 8.74 min, bottom stirring gas intensity 0.20 m³/t, average temperature 1 328 ℃, average basicity 1.51, and w（T.Fe）=12 %~16 % in early stage dephosphorization of 100 t converter. The carbon mass fraction was 0.113 % and the phosphorus mass fraction was 0.011 % using new double-slag process in one converter. Compared with the conventional smelting process, with the same endpoint carbon content, the phosphorus mass fraction decreased 45 %, and the consumption of slagging material decreased 11.6 kg/t.

Key words: top and bottom combination blown converter, new double-slag process in one converter, dephosphorization process, oxygen blowing, slagging