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Sunday, July 26, 2020 | History

3 edition of distribution of sulphur between molten steel and oxidized slag at equilibrium ... found in the catalog.

distribution of sulphur between molten steel and oxidized slag at equilibrium ...

Frank Walton Scott

distribution of sulphur between molten steel and oxidized slag at equilibrium ...

by Frank Walton Scott

  • 74 Want to read
  • 7 Currently reading

Published in [n. p .
Written in English

    Subjects:
  • Steel -- Metallurgy,
  • Slag,
  • Sulphur

  • Edition Notes

    covwer-title

    ContributionsJoseph, Thomas Leonard, 1894- joint author.
    Classifications
    LC ClassificationsTN707 .S35
    The Physical Object
    Pagination[16] p. illus., diagrs.
    Number of Pages16
    ID Numbers
    Open LibraryOL6455633M
    LC Control Number43016114
    OCLC/WorldCa29081327

    the sulfur content in the molten steel is reduced by % from 16 to 6 ppm. When the argon flowrate increases, higher quantities of large bubbles will be produced. An increased argon flow facilitates the formation of a bare slag surface in molten steel, which leads to uptake by the molten steel and reduces the desulfurization efficiency. It was recently found that P was not distributed to the matte in equilibrium with the molten slag. To gain knowledge of the process’s development, it is important to investigate the influence of the partial pressures of sulfur and oxygen on the equilibrium distribution of Mn and Fe between the matte and the molten slag.

    and sulphur in the steel, but mainly on chemical composition and physical properties of slag. The refining of molten steel in the ladle furnace to meet the required compositional range requires the optimisation of the process parameters. For sulphur removal control, parameters such as argon gas flow. NPTEL provides E-learning through online Web and Video courses various streams.

    Fig. 4 Equilibrium manganese distribution between Ca0-Si0z-AlzMn0(5 %)-Fe0( %)-MgO,.,. and molt -en iron as a function of FeO content at K. The effect of FeO content in slag on the equilibrium Mn distribution between slag and molten iron in Fig. 4 indicated that the Mn distribution increases with FeO. results showed that by adding kg fluorite to the top slag of kg, it was possible to achieve a sulphur content of less than 10 ppm in the steel and a sulphur ratio between slag and steel of , and at the same time reduce the oxygen activity of the molten steel and the degassing time.


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Distribution of sulphur between molten steel and oxidized slag at equilibrium .. by Frank Walton Scott Download PDF EPUB FB2

Sulphur-oxygen equilibrium The equilibrium distribution of sulphur between slag and metal [14] can be expressed as S S O metal slag C f a S T S log log log [% ] (%) log (13) where (%S) slag and [%S] metal are the concentrations of sulphur in the slag and steel melt, respectively, C S is the sulphide capacity of the slag and f.

It is known that the sulfur distribution ratio is affected by the basicity of the molten slag and partial pressure of oxygen in the molten steel. Tellurium is also a chalcogen and its thermochemical properties are similar to sulfur. Equilibria of Gold and Silver Between Molten Copper and FeO x ‐SiO 2 ‐Al 2 O 3 Slag in Weee Smelting at Chromium Distribution Between Liquid Slag and Matte Phases (Pages: ) R Hurman Eric; Liquidus Measurement of Te‐O‐Na 2 O‐SiO 2 System Between and °C in Equilibrium with Air (Pages: ) Imam Santoso.

Abstract. A thermodynamic model for calculating the sulfur distribution ratio between ladle furnace (LF) refining slags and molten steel has been developed by coupling with a developed thermodynamic model for calculating the mass action concentrations of structural units in LF refining slags, i.e., CaO–SiO 2 –MgO–FeO–MnO–Al 2 O 3 hexabasic slags, based on the ion and molecule Cited by:   Manganese is used as a key alloying element in various advanced steel products to improve their mechanical properties.

The authors have proposed an innovative process to recycle Mn from steelmaking slag. In this process, steelmaking slag is first sulfurized to separate P and Mn, and then the matte is oxidized to increase the Mn/Fe ratio.

The equilibrium distribution ratio of Mn, Fe, Cited by: 3. used. In addition, the assumptions of a sulphur-oxygen equilibrium between steel and slag and the dilute solution model for the liquid steel phase were utilized in the calculations.

Measured oxygen activities in steel bulk, which varied between ppm, were compared to predicted oxygen activities. Dependence of final sulfur content [S] f in liquid steel on the initial sulfur content [S] i, the sulfur distribution ratio between molten slag and liquid metal, L S, and the ratio of slag to metal quantities, Q, is expressed as: () S f = S i 1 + L S ⋅ Q.

molten slag and metal was withdrawn from the furnace and. The sulphur partition between liquid steel and basic.

and FeO in slag. The equilibrium distribution of phosphorus and oxygen, for. Moisture content of steel slag is –%, specific gravity is –, compressive strength is between and MPa ( ksi), and the Mohs scale number is between 5 and 7. Grindability of steel slag is less than that of BF slag.

Hardness and specific gravity are greater than those of BF slag. Sulphur distribution ratio – Sulphur is distributed between the metal and slag phase at equilibrium. The sulphur distribution ratio normally depends on the oxygen activity in the liquid steel.

Steel desulphurization becomes more effective with the decreasing oxygen activity. Equilibrium of Oxygen Partition between Metal and Slag It is well known that the oxygen potential exerts a large influence on the sulfur partition between metal and slag.

The equilibrium of reaction (17) was determined by the use of the value of the equilibrium constant (18) reported in literature. of the slag as well as on the sulphur distribution ratios between the slag and metal phases have been dis-cussed. Emprical relationships were developed to express the sulphur di stribution ratios a nd sulphide capac-ities of the above slag system.

INTRODUCTION Manganese is a crucial alloying metal in the production of iron and steel. The sulfur capacity of smelting-separation slag (C S) and the equilibrium distribution ratio (L S) of sulfur between slag and molten steel at • C can be obtained.

wt%S is the mass of sulfur dissolved in slag, O2 and p S2 are the partial pressures of oxygen and sulfur, p respectively in the gas phase. Sulphide capacity is also equal to the relationship on the extreme right side of Eq.

(2), where K stands for the equilibrium constant of ionic sulfur removal reaction, i.e., reaction (1), and O2-and f S2-are. R. Rocca, N.

Grant, and J. Chipman: Distribution of Sulphur Between Molten Iron and Slags at Low Iron Oxide Concentrations. Trans. AIME ()p. ; Journal of Metals (April ). Google Scholar.

The correlation of the equilibrium behaviors of phosphorus and vanadium between slag and low carbon molten steel in inert atmosphere was investigated with respect to the experimental variables of.

Request PDF | Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range – K | Experiments were conducted to investigate the possibility of removing sulfur from.

The mathematical model of sulfur diffusion in the metal and oxide is employed. The experiment was carried out at the temperature of K. The result of the calculation is in qualitative agreement with the experiment. The proposed approach can be applied to the investigations of diffusion processes in molten metal and slag phases.

The sulfur distribution ratio expressed as L s = (S) slag /[S] Fe is closely linked to the equilibrium constant K (). A lower activity of FeO and a higher activity of CaO in the slag are in favor of a higher L s at a given temperature (constant K).

Sulfur burning furnaces are 2-cm-thick cylindrical steel shells lined internally with cm (total) of fire brick and insulating brick (Fig. ).Air and atomized molten sulfur enters at one end and hot SO 2, O 2, N 2 gas departs at the other end into a boiler (Fig. ).Some furnaces are provided with internal baffles.

The baffles create a tortuous path for the sulfur and air, promoting. The most popular method of desulfurization is removal of sulfur from molten steel to the basic reducing slag. Basic slag is a slag containing mainly basic oxides: CaO, MgO, MnO, FeO.

A typical basic slag consists of % CaO + MgO, % FeO, % SiO 2, % MnO. Transition of sulfur from steel to slag may be presented by the chemical equation: [S] + (CaO) = (CaS) + [O] The equilibrium.Slag The equilibrium slag composition and sulfur content are provided in Table 1.

Present experimental results are plotted with the results of various slag systems in Fig. 2. The sulfide capacity appears to increase with the extended basicity while there is a discrepancy in slopes among the slag systems.

The choice of the oxidation state is based on the latest measurement of the distribution of arsenic between slag and metal phases as a function of P(O 2), as shown in Fig. 4. As explained by Yazawa et al., for the equilibrium between slag and metal, the distribution of arsenic can be represented by (1) As (i n m e t a l) + ν O 2 = A s O.