Abstract：With the gradual reduction of high-quality minerals, the use of low-quality iron ore aggravates the dephosphorization task. How to achieve efficient and stable dephosphorization of hot metal pretreatment is a common concern of steelmaking technology researchers. The dephosphorization rate, material consumption and slag composition of iron ladle dephosphorization process in a stainless steel plant were analyzed by industrial data analysis, X-ray fluorescence analysis and direct reading spectrograph analysis. Combined with FactSage thermodynamic calculation, orthogonal test, slag mineral phase and composition analysis, the oxygen supply and slagging process of hot metal was optimized, and the process test was compared. The results show that before the process optimization, the dephosphorization rate was low and unstable, the material consumption was too much, the slag fluidity was poor, and the basicity was low. By increasing the oxygen flow rate and adjusting the addition system of slag materials, the melting point of the slag and the content of unmelted lime decrease after optimization, and more Ca2SiO4(C2S) phase is formed in the slag, which is beneficial to the formation of phosphorus-rich phase. The average dephosphorization rate of the end-point dephosphorization slag is 93.2 %, which is 5.7 percentage points higher than that before optimization, the phosphorus distribution ratio of slag (LP) increases, the average lg LP is 4.11, which is 23% higher than that before optimization. After the process optimization, the lime consumption per ton of iron is decreased by 4.37 kg, the oxide scale consumption per ton of iron is decreased by 5.12 kg, the slagging agent consumption per ton of iron is decreased by 0.54 kg, the oxygen consumption per ton of iron is increased by 0.73 m3, and the overall consumption cost of slag materials is decreased. It is in line with efficient, stable, green and low-carbon production, which is of great significance for steel plants to enhance their product competitiveness.
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FENG Menglong, LIN Lu, YAO Tonglu, LI Xiangchen, HE Sai. Process optimization and industrial test of iron ladle dephosphorization[J]. China Metallurgy, 2024, 34(2): 108-116.
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