| 摘要 |
PROBLEM TO BE SOLVED: To surely obtain the desirable [P] while suppressing foaming of slag by regulating quantity and timing of supply of gaseous oxygen and solid oxygen source and quantity of supply of carbonaceous material in dephosphorization treatment. SOLUTION: In a first blowing period, supply speed of the gaseous oxygen is set to be in the range of 0.9 to 1.2 Nm3/t/min, in a second blowing period, the supply speed of the gaseous oxygen is set to be in the range of 0.5 to 0.8 Nm<SP>3</SP>/t/min and in a third blowing period, the supply speed of the gaseous oxygen is set to be in the range of 0.9 to 1.2 Nm<SP>3</SP>/t/min. The solid oxygen source is obtained by blending the carbonaceous material into iron oxide having a granular diameter of 1 to 10 mm at a mass blending ratio of 1-5% in the carbon component. In the first period, average supply speed of the solid oxygen source is set to be in the range of 1.1 to 4.5 kg-O/t/min, and in the second period, the supply of the solid oxygen source is stopped. COPYRIGHT: (C)2011,JPO&INPIT |
