Kinetics of Dephosphorization at Different Slag Basicities in the Double Slag Converter Steelmaking Process

2021 ◽  
pp. 2100256
Author(s):  
Runhao Zhang ◽  
Jian Yang ◽  
Han Sun ◽  
Wenkui Yang
Keyword(s):  
Converter Steelmaking ◽  
Steelmaking Process ◽  
Kinetics Of ◽  
Double Slag

scholarly journals Dephosphorization by Double-Slag Process in Converter Steelmaking

2018 ◽  
Vol 37 (7) ◽  
pp. 625-633
Author(s):  
Yang Wang ◽  
Shufeng Yang ◽  
Jingshe Li ◽  
Jie Feng ◽  
Feng Wang
Keyword(s):  
Production Efficiency ◽  
Smelting Process ◽  
Converter Steelmaking ◽  
Steelmaking Process ◽  
Key Factors ◽  
Iron Slag ◽  
Low Phosphorus ◽  
Dephosphorization Slag ◽  
Phosphorus Steel ◽  
Double Slag

AbstractThe double-slag converter steelmaking process can smelt low- and ultra-low-phosphorus steel and reduce lime and dolomite consumption and the amount of final slag simultaneously. Industrial steelmaking tests on a 150-metric ton converter at the Tangsteel Company were carried out to study this principle and its effect on the dephosphorization ratio and material consumption. The results showed that low-temperature stage could be used with a reduced amount of slag in the double-slag steelmaking process to achieve rapid and efficient dephosphorization. A low-basicity slag (~1.5–2.0) in the dephosphorization stage is required in double-slag process. The dephosphorization ratio reached a maximum of 71 % when the slag basicity was 1.7. The end-point phosphorus content after the smelting process was reduced from an average of 0.018 mass% to an average of 0.011 mass% and the dephosphorization efficiency increased by more than 6 %. The dephosphorization slag could be poured out rapidly when the FeO content was controlled at ~16–20 mass% in the double-slag smelting process. Based on key factors such as an efficient dephosphorization and a rapid iron–slag separation, the production efficiency was improved and the smelting cycle increased by only four minutes over the conventional process.

scholarly journals Microstructure and Viscosity of Dephosphorization Slag in New Double Slag Converter Steelmaking Process

2021 ◽  
Vol 61 (10) ◽  
pp. 2490-2500
Author(s):  
Wenkui Yang ◽  
Jian Yang ◽  
Runhao Zhang ◽  
Han Sun
Keyword(s):  
Converter Steelmaking ◽  
Steelmaking Process ◽  
Dephosphorization Slag ◽  
Double Slag

scholarly journals Dephosphorization in Double Slag Converter Steelmaking Process at Different Temperatures by Industrial Experiments

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1030
Author(s):  
Han Sun ◽  
Jian Yang ◽  
Xinwu Lu ◽  
Wanshan Liu ◽  
Gefan Ye ◽  
...  
Keyword(s):  
Dynamic Equilibrium ◽  
Converter Steelmaking ◽  
Steelmaking Process ◽  
Hot Metal ◽  
Experimental Conditions ◽  
Rich Phase ◽  
Temperature Range ◽  
Industrial Experiments ◽  
Dephosphorization Slag ◽  
Double Slag

In the present work, the effect of dephosphorization endpoint temperature on the dephosphorization of hot metal was studied for the double slag converter steelmaking process under the conditions of low temperature and low basicity by the industrial experiments. In the temperature range of 1350–1450 °C, with an increasing dephosphorization endpoint temperature, the dephosphorization ratio and phosphorus distribution ratio first increase and then decrease. The phosphorus content in hot metal first decreases and then increases at the end of dephosphorization. At the dephosphorization temperature range of 1385–1410 °C, the dephosphorization ratio is higher than 55%, the P2O5 content in the dephosphorization slag is 3.93–4.17%, the logLP value is 1.76–2.09, the value of PCOP-C of the selective oxidation reaction of carbon and phosphorus is 53–80 Pa, and the aFeO value is 0.284–0.312. The path of phosphorus in hot metal entering the P-rich phase of dephosphorization slag can be reasonably inferred as: hot metal → Fe-rich phase → P-rich phase. Under the present industrial experimental conditions, the dephosphorization and rephosphorization reactions are in dynamic equilibrium at 1413 °C. Considering the experimental results and thermodynamic calculation results of industrial experiments by the double slag dephosphorization process, the optimal temperature range for intermediate deslagging is about 1400–1420 °C.

Kinetic model of dephosphorization in the new double slag converter steelmaking process

2021 ◽  
pp. 1-14
Author(s):  
Run-hao Zhang ◽  
Jian Yang ◽  
Wen-kui Yang ◽  
Han Sun
Keyword(s):  
Kinetic Model ◽  
Converter Steelmaking ◽  
Steelmaking Process ◽  
Double Slag

Behavior of Gas–Slag–Metal Emulsion with Nozzle–Twisted Lance in Converter Steelmaking Process

2021 ◽  
Author(s):  
Ming Lv ◽  
Hang Li ◽  
Tengchang Lin ◽  
Kun Xie ◽  
Kui Xue
Keyword(s):  
Converter Steelmaking ◽  
Steelmaking Process

Variation in Multiphase Flow Characteristics by Nozzle‐Twisted Lance Blowing in Converter Steelmaking Process

2021 ◽  
pp. 2100409
Author(s):  
Ming Lv ◽  
Hang Li ◽  
Xiangdong Xing ◽  
Tengchang Lin ◽  
Shaoyan Hu ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Flow Characteristics ◽  
Converter Steelmaking ◽  
Steelmaking Process

Effect of nozzle twisted oxygen lance on flow field and dephosphorisation rate in converter steelmaking process

2016 ◽  
Vol 44 (9) ◽  
pp. 640-648 ◽  
Author(s):  
F. Liu ◽  
D. Sun ◽  
R. Zhu ◽  
F. Zhao ◽  
J. Ke
Keyword(s):  
Flow Field ◽  
Converter Steelmaking ◽  
Oxygen Lance ◽  
Steelmaking Process
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