Effect of Na&lt;sub&gt;2&lt;/sub&gt;O on Phosphorus Enrichment and Separation in P-Bearing Steelmaking Slag

Li, Lin; Bao, Yanping; Jiang, Wei; Wu, Qingyan

doi:10.2355/isijinternational.55.552

Cited by 21 publications

(10 citation statements)

References 19 publications

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“…Many studies have shown that adding CaF 2 and Na 2 O changes the primary phase and phosphorus form, respectively [40,41]. Fig.…”

Section: Addition Of Caf 2 and Na 2 Omentioning

confidence: 99%

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Archives of Metallurgy and Materials

Yan-ling¹,

Gao²,

Feng-Shan³

et al. 2018

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A better understanding of phosphorus distribution in slag is necessary to develop an effective way to treat dephosphorization slag formed during steelmaking. Here, previous studies on the enrichment, separation, and recovery of phosphorus from dephosphorization slag are reviewed, along with their influencing factors. The results suggest that a proper heat treatment can promote the selective enrichment and growth of P-rich phases. Further, adding P 2 O 5 and Fe t O facilitates phosphorus enrichment. Also, Ca 3 (PO 4 ) 2 is precipitated from slag containing 18 wt% P 2 O 5 . MnO and MgO in the slag barely affect the phosphorus recovery. In contrast, the addition of Al 2 O 3 and TiO 2 significantly affects phosphorus enrichment and magnetic separation. A phosphorus recovery rate of more than 70% is achieved with the addition of 10 wt% Al 2 O 3 or 10 wt% TiO 2 . New phases (Na 2 Ca 4 (PO 4 ) 2 SiO 4 , Na 3 PO 4 , and Ca 5 (PO 4 ) 3 F) tend to be formed on the addition of Na 2 O and CaF 2 , which promote phosphorus enrichment. However, the addition of Na 2 O and CaF 2 results in the incomplete separation of phosphorus and iron, as CaF 2 and Na 2 O improve slag metallization and the magnetism of iron-rich phases.

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“…Many studies have shown that adding CaF 2 and Na 2 O changes the primary phase and phosphorus form, respectively [40,41]. Fig.…”

Section: Addition Of Caf 2 and Na 2 Omentioning

confidence: 99%

“…CaF 2 a nd Na 2 O can significantly reduce the melting point of slag and promote phosphorus enrichment [4,11,40,41]. Wang [4] has analyzed the effect of CaF 2 on crystallization in CaO-SiO 2 -Fe t O-MgO-P 2 O 5 -CaF 2 slag.…”

Section: Addition Of Caf 2 and Na 2 Omentioning

confidence: 99%

Archives of Metallurgy and Materials

Yan-ling¹,

Gao²,

Feng-Shan³

et al. 2018

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“…Diao et al [14] and Xuan et al [15] showed that adding both Al 2 O 3 and Na 2 O to fluoride-free CaO-FeO-SiO 2 slag results in better dephosphorization than adding Al 2 O 3 or Na 2 O alone; with controlled w(Na 2 O) at 0.7 to 3.1% and w(Al 2 O 3 ) at 2.5 to 7.9%, a dephosphorization rate of over 90% can be achieved. More importantly, both Al 2 O 3 and Na 2 O can enhance the enrichment of phosphorus in steel slag, with Al 2 O 3 increasing P 2 O 5 content in the 2CaO•SiO 2 -3CaO•P 2 O 5 (C2S-C3P) phase [16,17], and Na 2 O forming the highphosphorus solid solution Na 2 Ca 4 (PO 4 ) 2 SiO 4 [18], thereby facilitating the recovery and utilization of phosphorus in steel slag. The above thoroughly demonstrates that materials rich in Al 2 O 3 and FeOt, with a small amount of Na 2 O, are ideal for preparing fluoride-free steelmaking fluxes.…”

Section: Introductionmentioning

confidence: 99%

Properties of Fluorine-Free Steelmaking Flux Prepared Using Red Mud

Zhao,

Zhang,

2024

Metals

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The basic oxygen steelmaking process is based on the CaO-FeO-SiO2 ternary slag system, characterized by a high melting point and low lime dissolution rate, often becoming one of the key factors limiting the efficiency of the converter. The bulk solid waste red mud, produced by the Bayer alumina process and rich in Fe2O3/Al2O3/Na2O, significantly reduces the melting point of the steelmaking slag system and enhances the efficiency of lime dissolution. This study utilized red mud as the main raw material to prepare a fluoride-free flux. An in situ online observation system was used to measure the melting point of the flux and the dissolution rate of lime in the flux. The results indicate that the melting point of the red mud-based flux is below 1200 °C, and under the same conditions, the lime dissolution rate is 10 to 15 times higher than when this flux is not used. Experiments in a 10 kg induction furnace show that using this flux, the dephosphorization rate under conditions without oxygen blowing is close to 40%, far higher than the rate achieved using CaF2. Under oxygen-blowing conditions, the dephosphorization rate using the red mud-based flux is comparable to that of CaF2, and significantly higher than without any flux, especially under high [C] content conditions. The data show that the red mud-based flux has the potential to be widely used as a fluoride-free flux in the steelmaking process.

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“…Wang et al 18) reported that the addition of Na 2 O and B 2 O 3 could affect the morphology of the solid solution and the phosphorous partition. Bao et al 19,20) studied the effect of the addition of Na 2 O and CaF 2 on phosphorus enrichment in slag. Sun et al 21) investigated the influence of temperature on dephosphorization at lower basicity and lower temperature based on industrial experiments and IMCT, and found that increasing the enrichment degree of C 2 S-C 3 P in the dephosphorization slag was conducive to dephosphorization of hot metal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slag Phase on Dephosphorization in BOF

Xia,

Wang,

et al. 2023

ISIJ Int.

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In this work, the effect of the slag phase on dephosphorization in BOF (basic oxygen furnace) is explored by industrial practical experiments. The research results show that the final dephosphorization rate is related to the phase of slag rather than basicity and T.Fe content in slag. The correlation between the dephosphorization ability of slag and the proportion of liquid phase (phase B) and phosphorus-containing solid solution phase (phase A) in the slag is much higher than that of RO (MgO•FeO, MnO•FeO) phase (phase C). The phosphorous partition fitting by using the minimum second-order multiplication proposed in this work is compared with the equations suggested by Healy and Ogawa. The comparison result shows that the dephosphorization ability of slag can be well predicted by analyzing the proportion of liquid phase and phosphorus-containing solid solution phase in slag, and the mechanism of the influence of the slag phase on dephosphorization is discussed.

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Effect of Na<sub>2</sub>O on Phosphorus Enrichment and Separation in P-Bearing Steelmaking Slag

Cited by 21 publications

References 19 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Properties of Fluorine-Free Steelmaking Flux Prepared Using Red Mud

Effect of Slag Phase on Dephosphorization in BOF

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