Semisteel steelmaking slagging method aided by utilizing burn-in tailings
A steelmaking slagging agent and tailings technology, which is applied in the field of semi-steel steelmaking, can solve the problems of aggravated furnace lining erosion, short duration, unfavorable environmental protection, etc., and achieve the goals of shortening the initial slag formation time, lowering the melting point, and saving energy consumption Effect
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Embodiment 1
[0026] For the production of steel type HRB335, 112 tons of semi-steel are loaded into the converter, [C] 3.74%, [S] 0.038%, [P] 0.085% in the semi-steel, the temperature is 1368°C, and the steel output of this furnace is 105 tons; The target temperature of HRB335 blowing end point is 1670℃, [C]0.05-0.15%, [S]≤0.040%, [P]≤0.035%. When blowing starts, add lime at 30kg / t steel (5kg / t steel less than the normal amount), add dolomite at 15kg / t steel, and add machine-burned tailings at 5.0kg / t steel. The slagging time in the early stage of blowing is At 211 seconds, the slag was sampled 1 minute after the initial slag was formed, and the basicity was 3.03; the phosphorus distribution ratio was 59, and the TFe content was 23%. Add lime 2000kg (1000kg each time) in two batches when blowing reaches 6-7 minutes. In the middle stage of converter blowing (8 minutes of oxygen supply), the sonar slag analyzer shows that the process is dry, and the instantaneous oxygen supply is reduced fr...
Embodiment 2
[0028]Production of steel grade 45, 118 tons of semi-steel into the converter, [C] 3.82%, [S] 0.045%, [P] 0.095% in the semi-steel, the temperature is 1374°C, and the steel output of this furnace is 108 tons; Species 45 requires a blowing end point temperature of 1630-1645°C, [C]0.10-0.20%, [S]≤0.025%, and [P]≤0.015%. When blowing starts, add lime at 35kg / t steel (5kg / t steel less than the normal amount), add dolomite at 18kg / t steel, and add machine-burned tailings at 7.8kg / t steel. The slagging time in the early stage of blowing is At 174 seconds, the slag was sampled after 1 minute of initial slag formation, and the basicity was 3.33; the phosphorus distribution ratio was 76, and the TFe content was 24%. Add lime 2000kg (1000kg each time) in two batches when blowing reaches 5-6 minutes. In the middle stage of converter blowing (when oxygen is supplied for 7 minutes), the sonar slag analyzer shows that the process is back dry, and the instantaneous oxygen supply is reduced ...
Embodiment 3
[0030] For the production of steel grade ER70S-6, 115 tons of semi-steel are loaded into the converter, [C] 3.84%, [S] 0.042%, and [P] 0.088% in the semi-steel, the temperature is 1368°C, and the tapping volume of this furnace is 106 tons ; Steel ER70S-6 blowing end point requires a temperature of 1640-1665 ° C, [C] 0.04-0.09%, [S] ≤ 0.025%, [P] ≤ 0.010%. When blowing starts, add lime at 45kg / t steel (5kg / t steel less than the normal amount), add dolomite at 23kg / t steel, and add machine-burned tailings at 10kg / t steel. The slagging time in the early stage of blowing is 168 Second, the slag was sampled after 1 minute of initial slag formation, the basicity was 3.44; the phosphorus distribution ratio was 93, and the TFe content was 23%. Add lime 800kg when blowing reaches 5 minutes. In the middle stage of converter blowing (when oxygen is supplied for 7 minutes), the sonar slag analyzer shows that the process is back to dry, and the instantaneous oxygen supply is reduced from ...
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