Effect of the Fe2O3 Addition Amount on Dephosphorization of Hot Metal with Low Basicity Slag by High-Temperature Laboratorial Experiments

Yang, Wenkui; Yang, Jian; Shi, Yanqiu; Yang, Zhijun; Gao, Fangyuan; Zhang, Runhao; Sun, Han

doi:10.3390/met11030417

Cited by 15 publications

(10 citation statements)

References 29 publications

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“…4 shows the relationship between the content of silicon and phosphorus in the molten iron in the four groups of experiments. It can be seen that the content of silicon and phosphorus is positively correlated, which is consistent with the research of Yang et al 20) The dephosphorization rate is calculated by Eq. ( 10), and the calculation result is shown in Fig.…”

Section: Influence Of Dedusting Ash Ratio On Molten Iron Elementssupporting

confidence: 90%

Effect of Converter Dust on Phosphorus Migration Behavior in Molten Iron

Zhou

Chen

et al. 2023

ISIJ Int.

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In order to make better use of converter dust to achieve effective predephosphorization of molten iron, the influence of the addition ratio of dedusting ash and oxide scale on dephosphorization of molten iron was compared, so as to reveal the reasons for the decrease of dephosphorization rate caused by dust. Through theoretical analysis, XRD, SEM-EDS, Raman and infrared spectroscopy, the influence of mineral phase structure, polymerization degree and phosphorus structure of pre-dephosphorization final slag on predephosphorization was studied. The results show that when the proportion of dedusting ash in the oxidant increases from 0 to 25%, the dephosphorization rate decreases from 50.8% to 38.71%, and the dephosphorization rate increases to 50% after adding fluorite. The increase in the proportion of dedusting ash will lead to the decrease of phosphorus-rich phase and the increase of RO phase and iron-rich phase, which will affect the dephosphorization effect. When the dedusting ash ratio increased from 0% to 25%, the proportion of Q 0 (Si), Q 0 (P), Q 1 (P) and [FeO 6 ] 9structures in the pre-dephosphorization final slag increased, which was beneficial to the diffusion in the slag, but unfavorable to the migration of phosphorus. In addition, by adding fluorite in the experiment with 25% dedusting ash, it was found that the molar fractions of Q 1 (Si), Q 3 (Si), Q 0 (P) and Q 2 (P) in the pre-dephosphorization final slag increased, and the phosphorus migrating into the silicon-oxygen network structure gradually increased. This study can provide reference for iron and steel enterprises to realize the secondary utilization of dedusting ash.

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Section: Influence Of Dedusting Ash Ratio On Molten Iron Elementssupporting

confidence: 90%

Effect of Converter Dust on Phosphorus Migration Behavior in Molten Iron

Zhou

Chen

et al. 2023

ISIJ Int.

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“…As the iron in the slag mainly exists in the form of FeO, 14,17) the T.Fe content in the slag is converted theoretically into the FeO content to calculate the slag viscosity.…”

Section: Calculation Of the Viscosity Of Dephosphorization Slagmentioning

confidence: 99%

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

Yang

Zhang

et al. 2021

ISIJ Int.

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The structure and viscosity of the dephosphorization slag in new double slag converter steelmaking process with low basicity slag at the low temperature range of 1 573 K-1 723 K are studied with hightemperature laboratorial experiments. With increasing the end temperature of dephosphorization, the viscosities of different slags decrease rapidly at first, then decrease slowly, and the slag activation energies increase. The values of Non-Bridging Oxygen per Silicon (NBO/Si) decrease, indicating the increase in the degree of polymerization (DOP) of the dephosphorization slag and the viscous flow activation energy of the dephosphorization slag. The results of Raman and FTIR spectroscopy are consistent. The dephosphorization slag in the temperature range of 1 573 K-1 673 K is mainly composed of the P-rich region, Fe-rich region and liquid region. With increasing temperature from 1 573 K to 1 673 K, the proportion of the liquid region in slag increases, but the P-rich and Fe-rich regions correspondingly decrease.

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“…Table 1 shows the target and actual compositions of the decarburization slag, whose mineralogical structures and chemical compositions are similar to those of the final slag in the industrial decarburization process. The detailed preparation process and mineralogical structures can be referred to in our previous papers [15,16]. In Table 1, the basicity (R) is the mass ratio of CaO to SiO 2 .…”

Section: Preparation Of Decarburization Slag and Pig Ironmentioning

confidence: 99%

“…As stated above, the previous works about the effect of the basicity on mineralogical phases and micro-structure of dephosphorization slag in the NDSP at 1623 K are quite limited and need to be studied. In our previous works, the effects of the temperature, the initial P content in the hot metal, and the Fe 2 O 3 addition amount on dephosphorization of hot metal in the NDSP have been studied [12,15,16]. Besides, the effect of the temperature on the micro-structure and viscosity of dephosphorization slag in the NDSP has also been investigated [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Basicity on Mineralogical Phases and Micro-Structure of Dephosphorization Slag in the New Double Slag Converter Steelmaking Process

Yang

Zhang

et al. 2021

Metals

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In the present work, the effect of the basicity at the lower range from 0.98 to 2.13 on dephosphorization of hot metal at 1623 K was studied through high-temperature laboratorial experiments. With the increase of the basicity from 0.98 to 2.13, the P and C contents in hot metal rapidly decrease and increase at first, and then gradually decrease and increase, respectively. From the scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction (XRD) results, with the increase of the basicity, the phase containing the high P content changes from the matrix phase into the phosphorus (P)-rich phase. Under the present experimental conditions, the P-rich phase can only be precipitated from the liquid slag when the basicity is higher than 1.55, which is a benefit to the dephosphorization. As the Raman intensity of the P-O-Ca structure unit in the P-rich phase is significantly higher than that of the P-O-Si structure unit, most of the phosphorus in the P-rich phase exists in the P-O-Ca structure unit and a small amount of phosphorus exists in the P-O-Si structure unit. With the increase of the basicity of the dephosphorization slag, the activity coefficient of P2O5, γ(P2O5) , in the liquid phase decreases, while the basicity in the liquid phase increases.

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Effect of the Fe2O3 Addition Amount on Dephosphorization of Hot Metal with Low Basicity Slag by High-Temperature Laboratorial Experiments

Cited by 15 publications

References 29 publications

Effect of Converter Dust on Phosphorus Migration Behavior in Molten Iron

Effect of Converter Dust on Phosphorus Migration Behavior in Molten Iron

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

Effect of the Basicity on Mineralogical Phases and Micro-Structure of Dephosphorization Slag in the New Double Slag Converter Steelmaking Process

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