Investigations of the Dephosphorization of Liquid Iron Solution Containing Chromium and Nickel

Karbowniczek, M.; Kawecka-Cebula, E.; Reichel, Jan

doi:10.1007/s11663-011-9627-x

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…Table 3 shows dephosphorization slag compositions and basicities at the endpoint of dephosphorization. It can be seen from Table 2 that the temperature of the dephosphorization endpoint is in the range of 1350-1450 • C. Basicity B is calculated with Equation (1), and η P represents the dephosphorization ratio, which is calculated by Equation (2) [19]:…”

Section: Compositions Of the Initial Hot Metal The Hot Metal At The Endpoint Of Dephosphorization And Dephosphorization Slagmentioning

confidence: 99%

Dephosphorization in Double Slag Converter Steelmaking Process at Different Temperatures by Industrial Experiments

Sun

Yang

Xin-wu³

et al. 2021

Metals

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In the present work, the effect of dephosphorization endpoint temperature on the dephosphorization of hot metal was studied for the double slag converter steelmaking process under the conditions of low temperature and low basicity by the industrial experiments. In the temperature range of 1350–1450 °C, with an increasing dephosphorization endpoint temperature, the dephosphorization ratio and phosphorus distribution ratio first increase and then decrease. The phosphorus content in hot metal first decreases and then increases at the end of dephosphorization. At the dephosphorization temperature range of 1385–1410 °C, the dephosphorization ratio is higher than 55%, the P2O5 content in the dephosphorization slag is 3.93–4.17%, the logLP value is 1.76–2.09, the value of PCOP-C of the selective oxidation reaction of carbon and phosphorus is 53–80 Pa, and the aFeO value is 0.284–0.312. The path of phosphorus in hot metal entering the P-rich phase of dephosphorization slag can be reasonably inferred as: hot metal → Fe-rich phase → P-rich phase. Under the present industrial experimental conditions, the dephosphorization and rephosphorization reactions are in dynamic equilibrium at 1413 °C. Considering the experimental results and thermodynamic calculation results of industrial experiments by the double slag dephosphorization process, the optimal temperature range for intermediate deslagging is about 1400–1420 °C.

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Section: Compositions Of the Initial Hot Metal The Hot Metal At The Endpoint Of Dephosphorization And Dephosphorization Slagmentioning

confidence: 99%

Dephosphorization in Double Slag Converter Steelmaking Process at Different Temperatures by Industrial Experiments

Sun

Yang

Xin-wu³

et al. 2021

Metals

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“…38 test heats were made in order to study the dephosphorization process of liquid metal in an induction furnace with a capacity of 20 kg [1]. A high chromium pig iron containing 2÷4% of carbon, 2÷18% of chromium, 1÷3% of nickel and 0.04÷0.16% of phosphorus was used.…”

Section: Experimental Investigationsmentioning

confidence: 99%

The Effect of Slag on the Effectiveness of Phosphorus Removal from Ferrous Alloys Containing Carbon, Chromium and Nickel

Kawecka-Cebula

Karbowniczek

Suliga

2016

Archives of Metallurgy and Materials

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ThE EffEcT of Slag on ThE EffEcTIvEnESS of PhoSPhoruS rEmoval from fErrouS alloyS conTaInIng carbon, chromIum and nIckElThe aim of this study was to determine the impact of slag composition on phosphorus removal from ferrous solutions containing carbon, chromium and nickel. Additions of cryolite, Na3AlF6, were applied for better fluxing and higher phosphate capacity of the slag. An X-ray analysis of final slags formed during dephosphorization of ferrous solutions containing chromium and nickel with CaO-CaF2 or CaO-CaF2-Na3AlF6 mixtures of different chemical compositions was carried out. The equilibrium composition of the liquid and the solid phase while cooling the slags from 1673K to 298K was computed using FactSage 6.2 software. The performed equilibrium computations indicated that the slags were not entirely liquid at those temperatures. The addition of cryolite causes a substantial increase of the liquid phase of the slag. It also has a favourable effect on the dephosphorization grade of hot metal. The obtained results were statistically processed and presented in the form of regression equations.

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“…Alkaline earth metals exhibit also another common feature: their solubility in liquid iron increases with increasing nickel concentration, and decreases with the increase in chromium concentration [8]. It should be emphasized, however, that this increase due to nickel is much greater than the decrease with increasing chromium content.…”

Section: Theoretical Fundamentalsmentioning

confidence: 99%

The Use of Barium and Calcium Alloys in the Ladle Furnace Treatment of Selected Grades of Continuously Cast Steels

Derda¹,

Lawenda²,

Pardela³

2015

Archives of Metallurgy and Materials

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The subject of the paper are the results of laboratory and industrial investigations into the use of Si -Ca -Ba alloys for modifying non-metallic inclusions. Based on laboratory tests, the morphology and chemical composition of non-metallic inclusions in carbon steel were examined before and after refining with the use of the above-mentioned alloy as a refining addition. In particular tests, variable additions of the alloy were used at a constant refining time and temperature.Comparison of the process of casting of a sequence of seven heats of the same steel grade using the stopper system in the tundish was made under industrial conditions. In these heats, additions of Si -Ca (three heats) and Si -Ca -Ba (four heats) were introduced as a non-metallic inclusion modifier in the form of core wires during the process in the ladle furnace. For the investigated heats, the contents of total oxygen and calcium were assayed in the finished steel. A significant effect of the simultaneous addition of barium and calcium on steel castability, and thus on the process of continuous casting of the investigated heats, was found.Keywords: continuous casting of steel, non-metallic inclusion modification, calcium -barium alloy, steel castability Przedmiotem opracowania są wyniki badań laboratoryjnych oraz przemysłowych, dotyczących zastosowania stopów Si -Ca -Ba do modyfikacji wtrąceń niemetalicznych. Na podstawie badań laboratoryjnych zbadano morfologię i skład chemiczny wtrąceń niemetalicznych w stali węglowej przed i po rafinacji przy zastosowaniu ww. stopu w charakterze dodatku rafinacyjnego. W poszczególnych próbach zastosowano zmienne dodatki stopu przy stałym czasie i temperaturze rafinacji.W warunkach przemysłowych dokonano porównania przebiegu odlewania sekwencji siedmiu wytopów tego samego gatunku stali z zastosowaniem układu zatyczkowego w kadzi pośredniej. W wytopach tych podczas procesu w piecu kadziowym wprowadzono w charakterze modyfikatora wtrąceń niemetalicznych dodatki Si -Ca (trzy wytopy) oraz Si -Ca -Ba (cztery wytopy) w postaci drutów rdzeniowych. Dla badanych wytopów w gotowej stali oznaczono zawartości tlenu całkowitego oraz wapnia. Stwierdzono istotny wpływ jednoczesnego dodatku baru i wapnia na lejność stali, a tym samym na przebieg ciągłego odlewania badanych wytopów

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Investigations of the Dephosphorization of Liquid Iron Solution Containing Chromium and Nickel

Cited by 9 publications

References 18 publications

Dephosphorization in Double Slag Converter Steelmaking Process at Different Temperatures by Industrial Experiments

Dephosphorization in Double Slag Converter Steelmaking Process at Different Temperatures by Industrial Experiments

The Effect of Slag on the Effectiveness of Phosphorus Removal from Ferrous Alloys Containing Carbon, Chromium and Nickel

The Use of Barium and Calcium Alloys in the Ladle Furnace Treatment of Selected Grades of Continuously Cast Steels

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