High Efficiency Dephosphorization by Mixed Injection during Steelmaking Process

A new dephosphorization technology with introduction of partial CO2 into O2 is proposed in this paper. Thermodynamic characteristics and dephosphorization mechanism by introduction of CO2 are analyzed and the results show that using CO2 as partial dephosphorization oxidant can change the selective o...

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Bibliographic Details
Published in:Steel research international 2019-03, Vol.90 (3), p.n/a
Main Authors: Lv, Ming, Zhu, Rong, Yang, Ling‐zhi
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon monoxide
Core loss
dephosphorization
Dephosphorizing
Iron and steel making
New technology
Oxidation
Partial pressure
Phosphorus
phosphorus partition ratio
selective oxidation
Slag
Steel converters
steelmaking
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Summary:A new dephosphorization technology with introduction of partial CO2 into O2 is proposed in this paper. Thermodynamic characteristics and dephosphorization mechanism by introduction of CO2 are analyzed and the results show that using CO2 as partial dephosphorization oxidant can change the selective oxidation condition of steelmaking system, control the temperature of bath, strengthen the stirring ability, and finally obtain a high efficiency of dephosphorization. Meanwhile, the relationship between selective oxidation temperature T of C and P, partial pressure of CO gas, slag activity, and compositions of melt is obtained as follows. T=(PCO/P0)0.0401a4CaO·P2O50.0080·exp(−0.0403[%C]−0.0030[%Si]+0.0011[%Mn]+0.3515[%P]+7.3986) Furthermore, dephosphorization trails are carried out in a 30t steelmaking converter and a 300t special dephosphorization converter, respectively. It is concluded that the new technology of injecting CO2–O2 mixture is beneficial to reduce phosphorus content in liquid steel, increase the partition ratio of phosphorus, and reduce iron loss of slag. A new dephosphorization technology with introduction of partial CO2 into O2 is proposed during steelmaking process. Through the an alysis of thermodynamics and kinetics, it is found that CO 2 can participate in dephosphorization, strengthen s tirring ability, and control the bath temperature. Furthermore, industrial experiments are performed in a 30t steelmaking converter and a 300t special dephosphorization converter, respectively, which obtains good dephosphorization results.
ISSN:1611-3683
1869-344X
DOI:10.1002/srin.201800454