Die Gleichgewichte zwischen Eisenschmelzen und kalkhaltigen Phosphatschlacken bei Gegenwart von Kieselsäure und Manganoxyd

Trömel, Gerhard; Fix, Wolfdietrich

doi:10.1002/srin.196203392

Cited by 13 publications

(13 citation statements)

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“…To confirm this, logarithms of kp were calculated from the results for the phosphorus partitions between liquid iron and dolomite-,18) CaO-,18-21) 3CaO • P2O5-,22) and 4CaO • P205- 21,22) saturated phosphate slags at 1 600 °C. The data for FeO > Fe203, (FeO +Fe203) > 10 wt%, MnO < 1 wt% were used for the calculation of log kp.…”

Section: Flood-grjotheim's Ionic Treatment14~mentioning

confidence: 99%

Effect of Calcium Fluoride on Phosphorus Distribution between MgO Saturated Slags of the System CaO-MgO-FeOx-SiO2 and Liquid Iron

Suito

Inoue

1982

ISIJ Int.

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SynopsisExperiments have been made to study the phosphorus distribution between liquid iron and Mg0 saturated Ca0-Mg0-Fe0x-Si02 slags containing 1 to 4 % CaF2 in the temperature range 1 550 to 1 650 °C. The effect of CaF2 on the equilibrium quotient k5(= (%P205) f ([%P]2(%FeO)5}) was found to be nearly equal to that of Ca0 on the weight percentage base. The equilibrium quotient kp is expressed as The effect of CaF2 on the activity coefficient o f P205 was also studied by the Turkdogan and Pearson's treatment. The following expression for the activity coefficient of P205 is given for the slaps containing CaF2.log TP2o5 = -1.01(23NCao+21NcaF2+l7WMgo+BNFeo) -26300/T+ 11.24It was found from the plot of the activity coefficient of FeO vs. the mole fraction of Si02 that the activity of FeO increases with the addition of CaF2. I. IntroductionThe beneficial effect of fluorspar addition to steelmaking slags has been traditionally recognized. Laboratory and plant scale investigations on fluorspar substitutes have been made on account of the short supply and rising cost of metallurgical fluorspar as well as the environmental problem. The addition of fluorspar to steelmaking slags increases the degree of dephosphorization and desulfurization; it is not clear, however, whether fluorspar affects the slag-metal equilibrium ratios, or whether it simply causes the increase of the fluidity of slags and, consequently, faster approach to the equilibrium. The fundamental study on the influence of CaF2 on the phosphorus partitions between slaps and metal has been first made by Winkler and Chipman,1 who have reported the partitions between liquid iron and Mg0 saturated Ca0--Mg0-FeOx Si02-P205 slags with 4 to 18 % CaF2 in the temperature range of 1 530 to 1 640 °C. The contents of P205 in the slags are between 6 wt% and 19 wt%. Their conclusion is that the addition of fluorspar have no adverse effect on the dephosphorizing power of the slag. However, the small number of melts (7 melts) investigated by Winkler and Chipman have not allowed the quantitative deductions for the exact effect of CaF2 on the slag-metal equilibrium. The further systematic works are necessary to the de-

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Section: Flood-grjotheim's Ionic Treatment14~mentioning

confidence: 99%

Effect of Calcium Fluoride on Phosphorus Distribution between MgO Saturated Slags of the System CaO-MgO-FeOx-SiO2 and Liquid Iron

Suito

Inoue

1982

ISIJ Int.

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“…The most fundamental system for the dephosphorization of slag in the BOF process is the CaO-Fe t O-P 2 O 5 system. Many experimental studies have been performed to determine the phase diagram and phosphorus distribution between the slag and molten iron in the temperature [16,[45][46][47][48][49][50][51] in Figure 6 (b) and (c), respectively. The L P data in Figure 6 (b) are well reproduced in a wide range of compositions and temperatures, and the changes in the location of maximum L P are also well reproduced within the experimental error limits.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…A large amount of experimental data for the dephosphorization distributions between multicomponent slags (CaO-MgO-SiO 2 -Fe t O-Na 2 O-Al 2 O 3 -MnO-P 2 O 5 system) and liquid iron at temperatures from 1100 to 1700°C were collected from literature [16,45,47,[51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70] and reviewed in the present study. Thermodynamic calculations between the slag and molten iron were performed using the present thermodynamic database based on each experimental condition.…”

Section: Application To Dephosphorization In the Bof Processmentioning

confidence: 99%

Thermodynamic Database of P2O5-containing Oxide Systems for the Dephosphorization Process in Steelmaking

Jung

Hudon

Kim

et al. 2013

High Temperature Materials and Processes

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The Na 2 O-MgO-CaO-FeO-Fe 2 O 3 -Al 2 O 3 -SiO 2 -P 2 O 5 system is a basic oxide system for the Basic Oxygen Furnace (BOF) process as well as the hot metal dephosphorization process. Numerous experimental investigations on this oxide system are being carried out to find out an advanced process route for P removal from molten iron. In spite of their industrial importance, however, phase equilibria in oxide systems containing P 2 O 5 have not been well investigated due to the complexity of their chemistry. No systematic thermodynamic modeling of these systems has been conducted to date, either. In order to meet the strong demands of steelmaking and other industries, new systematic thermodynamic modeling of the P 2 O 5 -containing oxide systems (Na 2 O-MgO-CaO-FeO-Fe 2 O 3 -Al 2 O 3 -SiO 2 -P 2 O 5 ) and key phase diagram experiments have been carried out over the past years. In the present study, the results of the thermodynamic modeling of unary, binary and ternary P 2 O 5 -containing systems and the applications of the thermodynamic database to the dephosphorization by multi-component slag in BOF process are presented in comparison with experimental data. All thermodynamic calculations were performed using FactSage thermodynamic software.

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“…(22) log Cpo4 4 log GPO4-I°xcaF2 ratio in Fe0-Fe203 Ca0-CaF2 P205 slags as a function of xcaF2 at 1 650 °C. Tromel et al15,16) and Knuppel and Oeters23) are also plotted as log CP04-vs. (xcao+0•S xcaF2) at 1 650 °C (Fig. 10) and 1 700 °C (Fig.…”

Section: Fe0-fe203mentioning

confidence: 99%

“…But a deviation from linearity to higher phosphate capacities CP04 occurs at (xcao)eq. > 0.6 to 0.7 with regard to the saturated FetO-CaO-P205 slags15, 16,23) which may be attributed to changes in the activities of slag components. It is felt that reliable experimental data on these activities especially in CaF2-containing slaps are required.…”

Section: Fe0-fe203mentioning

confidence: 99%

Phosphate capacity of FeO-Fe2O3-CaO-P2O5 and FeO-Fe2O3-CaO-CaF2-P2O5 slags by levitation melting.

et al. 1985

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SynopsisThe levitation melting technique has been used to study metal-slag relations with regard to dephosphorization o f liquid iron. The absence o f side-reactions with crucible materials and the rapid heating, melting, equilibration and quenching of the metal-slag specimens are considered as the main benefits of this technique. The slag system FetO-CaO-P205 with or without addition of CaF2 was used to dephosphorize Fe-P specimens with initial P contents of 0.055, 0.12 and 0.20 wt °0 and temperatures of 1 650 and 1 700 °C. Final phosphorus contents in the metal and partition ratios (% P205)/[% P1 are given as related to slag composition. Results are compared with previous data obtained for similar slags saturated with CaO or 4CaO. P205.

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Die Gleichgewichte zwischen Eisenschmelzen und kalkhaltigen Phosphatschlacken bei Gegenwart von Kieselsäure und Manganoxyd

Cited by 13 publications

References 0 publications

Effect of Calcium Fluoride on Phosphorus Distribution between MgO Saturated Slags of the System CaO-MgO-FeOx-SiO2 and Liquid Iron

Effect of Calcium Fluoride on Phosphorus Distribution between MgO Saturated Slags of the System CaO-MgO-FeOx-SiO2 and Liquid Iron

Thermodynamic Database of P2O5-containing Oxide Systems for the Dephosphorization Process in Steelmaking

Phosphate capacity of FeO-Fe2O3-CaO-P2O5 and FeO-Fe2O3-CaO-CaF2-P2O5 slags by levitation melting.

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