Phosphorous Partition in Dephosphorization Slag Occurring with Crystallization at Initial Stage of Solidification

Son, Pham Khanh; Kashiwaya, Yoshiaki

doi:10.2355/isijinternational.48.1165

Cited by 34 publications

(30 citation statements)

References 10 publications

(10 reference statements)

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“…It is because that the phosphate capacity index C PO 3À 4 ;index introduced by Yang et al [2,3] is more practical than the more widely applied phosphate capacity C PO 3À 4 proposed by Wagner. [1] Certainly, the discussed relationship between the phosphate capacity index C PO 3À 4 ;index of the slags and the related parameters in the following text can be easily converted into the relationship between phosphate capacity C PO 3À [30] Similar conclusions by other researchers [44][45][46][47][48][49][50] have been obtained from experiments that most of phosphorus in slags can be bonded with 2CaOAESiO 2 particles as 3CaOAEP 2 O 5 in slags.…”

Section: Evaluation Of Other Phosphate Capacity Prediction Modelssupporting

confidence: 51%

A Thermodynamic Model of Phosphate Capacity for CaO-SiO2-MgO-FeO-Fe2O3-MnO-Al2O3-P2O5 Slags Equilibrated with Molten Steel during a Top–Bottom Combined Blown Converter Steelmaking Process Based on the Ion and Molecule Coexistence Theory

Yang

Shi

Zhang

et al. 2011

Metall Mater Trans B

109

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slags at the steelmaking endpoint during an 80-ton top-bottom combined blown converter steelmaking process has been developed based on the ion and molecule coexistence theory (IMCT). The phosphate capacity has a close relationship with the phosphate capacity index, whereas the logarithm of phosphate capacity is 12.724 greater than that of phosphate capacity index at 1873 K (1600°C). The developed phosphate capacity prediction model can be also used to predict the phosphate capacity index with reliable accuracy compared with the measured and the predicted phosphate capacity index of the slags by other models in literatures. The results from the IMCT phosphate capacity prediction model show that the comprehensive effects of iron oxides and basic components control the dephosphorization reaction with an optimal ratio of (pct FeO)/(pct Fe 2 O 3 ) as 0.62. The determined contribution ratio of Fe t O, CaO + Fe t O, MgO + Fe t O, and MnO + Fe t O to the phosphate capacity or phosphate capacity index of the slags is approximately 0.0 pct, 99.996 pct, 0.0 pct, and 0.0 pct, respectively. The generated 2CaOAEP 2 O 5 , 3CaOAEP 2 O 5 , and 4CaOAEP 2 O 5 as products of dephosphorization reactions accounts for 0.016 pct, 96.01 pct, and 3.97 pct of the phosphate capacity or phosphate capacity index of the slags, respectively.

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Section: Evaluation Of Other Phosphate Capacity Prediction Modelssupporting

confidence: 51%

A Thermodynamic Model of Phosphate Capacity for CaO-SiO2-MgO-FeO-Fe2O3-MnO-Al2O3-P2O5 Slags Equilibrated with Molten Steel during a Top–Bottom Combined Blown Converter Steelmaking Process Based on the Ion and Molecule Coexistence Theory

Yang

Shi

Zhang

et al. 2011

Metall Mater Trans B

109

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show abstract

“…Up to now, recycling P-bearing slag as slag phosphate fertilizer has attracted widespread attention, in this regard, some scholars majorly researched on phosphorus existence in slag 7,8) and phosphorus enrichment separation behavior of P-bearing slag, [9][10][11][12][13] while there are few researches on citric © 2014 ISIJ acid solubility (for short P2O5 solubility) of P-bearing slag. [14][15][16] Slag phosphate fertilizer can not be dissolved in water, but can be dissolved in 2% citric acid solution.…”

Section: Introductionmentioning

confidence: 99%

P2O5 Solubility Behavior and Resource Utilization of P-Bearing Slag

Bao

Wang

et al. 2014

ISIJ Int.

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In order to recycle the phosphorus in P-bearing steelmaking slag and make it used as slag phosphate fertilizer, the citric acid solubility of P-bearing steelmaking slag was researched. The research results show that the citric acid solubility of P-bearing steelmaking slag is decreased with the increasing of P2O5 and Fe2O3 content for the CaO-SiO2-Fe2O3-P2O5 slag system. Added CaF2 into slag can easily form the fluorapatite (Ca5(PO4)2F) that can't be dissolved in 2% citric acid solution, which makes citric acid solubility of the slag decreased obviously. And added MgO, MnO or Na2O into slag can prevent the precipitation of β -Ca3(PO4)2 phase with low citric acid solubility, which makes the citric acid solubility of slag increased. While for the CaO-SiO2-Fe2O3-P2O5-X (MgO, MnO or Na2O) slag system, MgO and MnO in slag mainly enters into RO phase, which has no effect on the phosphorus existence form in slag and has little influence on citric acid solubility of the slag. The Na2O in slag changes the phosphorus existence form in slag, but the generated Na2Ca4(PO4)2SiO4 and Na3PO4 also have good citric acid solubility, which also has little effect on citric acid solubility. Al2O3 and TiO2 modification only increases the phosphorus content in phosphorus-rich phase, does not change the phosphorus existence form in slag, which makes the citric acid solubility increased slightly. While SiO2 modification prevents the precipitation of β -Ca3(PO4)2 phase with low citric acid solubility, which makes citric acid solubility of the slag increased significantly. The modified slag without fluoride makes the citric acid solubility increased to 95% and meets the requirement of producing slag phosphate fertilizer.

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“…Some scholars have made a lot of research on the slag phosphorus existence form [6][7][8][9][10][11] and magnetic separation behavior, [12][13][14][15][16] K. Yokoyama et al 17) found that phosphorus existed mainly in the form of nC 2 S-C 3 P solid solution in the slag, and firstly proposed phosphorus recover from the steelmaking slag by magnetic separation. But the systematic research on the effect of Na 2 O on resource utilization of P-bearing slag is less.…”

Section: )mentioning

confidence: 99%

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

Bao

Jiang

et al. 2015

ISIJ Int.

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Phosphorous Partition in Dephosphorization Slag Occurring with Crystallization at Initial Stage of Solidification

Cited by 34 publications

References 10 publications

A Thermodynamic Model of Phosphate Capacity for CaO-SiO2-MgO-FeO-Fe2O3-MnO-Al2O3-P2O5 Slags Equilibrated with Molten Steel during a Top–Bottom Combined Blown Converter Steelmaking Process Based on the Ion and Molecule Coexistence Theory

A Thermodynamic Model of Phosphate Capacity for CaO-SiO2-MgO-FeO-Fe2O3-MnO-Al2O3-P2O5 Slags Equilibrated with Molten Steel during a Top–Bottom Combined Blown Converter Steelmaking Process Based on the Ion and Molecule Coexistence Theory

P2O5 Solubility Behavior and Resource Utilization of P-Bearing Slag

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

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