Effect of slag composition on desulfurization during recycling rejected electrolytic manganese metal by electroslag remelting

To reduce the Mn vaporization during recycling rejected electrolytic manganese metal by electroslag remelting, it is proposed to reduce the temperature of molten slag pool, but which leads to the degradation of slag desulfurization. The desulfurization by interaction between CaF2–CaO–Al2O3–Na2O slag and rejected electrolytic manganese metal scrap was studied from the view of thermodynamics in this study. The results show that sulfur distribution ratio decreases with increase of CaF2 content, and increases with the increase of Na2O content and temperature. Na2O increases sulfur distribution ratio of slag by increasing CaO activity. Na2O addition in CaF2–CaO–Al2O3–Na2O slag can enhance desulfurization ability of slag due to the larger sulfur distribution ratio and lower viscosity. Thus, sulfur content in test of slag T3 bearing 45.8 wt% CaF2-23.2 wt% CaO-22.7 wt% Al2O3-8.3 wt% Na2O is much lower than that of slag without Na2O, implying that 45.8 wt% CaF2-23.2 wt% CaO-22.7 wt% Al2O3-8.3 wt%Na2O slag is the promising slag for recycling rejected electrolytic manganese metal by ESR.

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Distribution Ratio of Sulfur between CaO-SiO2-Al2O3-Na2O-TiO2 Slag and Carbon-Saturated Iron

Metals ◽

10.3390/met8121068 ◽

2018 ◽

Vol 8 (12) ◽

pp. 1068 ◽

Cited By ~ 2

Author(s):

Kanghui Zhang ◽

Yanling Zhang ◽

Tuo Wu

Keyword(s):

Experimental Data ◽

Distribution Ratio ◽

Hot Metal ◽

Tio2 Content ◽

Na2o Content ◽

Sulfur Distribution ◽

Reducing Conditions ◽

Hot Metal Desulfurization ◽

Sulfur Distribution Ratio ◽

Carbon Saturated Iron

To explore the feasibility of hot metal desulfurization using red mud, the sulfur distribution ratio (LS) between CaO-SiO2-Al2O3-Na2O-TiO2 slag and carbon-saturated iron is evaluated in this paper. First, the theoretical liquid areas of the CaO-SiO2-Al2O3 (-Na2O-TiO2) slag are discussed and the fluxing effects of Al2O3, Na2O, and TiO2 are confirmed. Then, LS is measured via slag-metal equilibrium experiments. The experimental results show that LS significantly increases with the increase of temperature, basicity, and Na2O content, whereas it decreases with the increase of Al2O3 and TiO2 content. Na2O in the slag will volatilize with high temperatures and reducing conditions. Furthermore, based on experimental data for the sulfur distribution ratio between CaO-SiO2-Al2O3-Na2O-TiO2 slag and the carbon-saturated iron, the following fitting formula is obtained: log L S = 45.584 Λ + 10568.406 − 17184.041 Λ T − 8.529

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A Thermodynamic Model of Sulfur Distribution Ratio between CaO–SiO2–MgO–FeO–MnO–Al2O3 Slags and Molten Steel during LF Refining Process Based on the Ion and Molecule Coexistence Theory

Metallurgical and Materials Transactions B ◽

10.1007/s11663-011-9547-9 ◽

2011 ◽

Vol 42 (6) ◽

pp. 1150-1180 ◽

Cited By ~ 45

Author(s):

Xue-Min Yang ◽

Cheng-Bin Shi ◽

Meng Zhang ◽

Guo-Ming Chai ◽

Fei Wang

Keyword(s):

Molten Steel ◽

Distribution Ratio ◽

Thermodynamic Model ◽

Refining Process ◽

Sulfur Distribution ◽

Coexistence Theory ◽

Lf Refining ◽

Sulfur Distribution Ratio

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Thermodynamic Model of Calculation of Sulfur Distribution Ratio between B2O3-Containing Slag and Molten Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.633-634.188 ◽

2014 ◽

Vol 633-634 ◽

pp. 188-191

Author(s):

Xiang Zhu ◽

Yang Li ◽

Xiao Jian Fan ◽

Hong Ming Wang ◽

Gui Rong Li

Keyword(s):

Molten Steel ◽

Distribution Ratio ◽

Thermodynamic Model ◽

Slag Basicity ◽

Sulfur Distribution ◽

Coexistence Theory ◽

Sulfur Distribution Ratio

A thermodynamic model of calculation of sulfur distribution ratio between B2O3-containing slag and molten steel has been developed on the basis of the ion and molecule coexistence theory. Based on the model, the effects of B2O3 content and slag basicity on the sulfur distribution ratio in 1873K were investigated respectively. The results indicate that the sulfur distribution ratio decreased with increasing the content of B2O3, and when the content of B2O3 exceeds 6%, the sulfur distribution ratio was lower than 2.0. Therefore, in order to ensure the desulphurization ability of slag, the content of B2O3 should be controlled at about 6%. Moreover the sulfur distribution ratio can be increased by increasing the slag basicity.

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Effects of slag composition and additive type on desulfurization of rejected electrolytic manganese metal scrap by Na2O-containing electroslag

Journal of Iron and Steel Research International ◽

10.1007/s42243-021-00680-5 ◽

2021 ◽

Author(s):

Ru Lu ◽

Guang-qiang Li ◽

Chang Liu ◽

Yun-ming Gao ◽

Yu-fei Chen ◽

...

Keyword(s):

Slag Composition ◽

Metal Scrap ◽

Additive Type ◽

Electrolytic Manganese

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Effect of SiO2 containing slag for electroslag remelting on inclusion modification of 42CrMo steel

Metallurgical Research & Technology ◽

10.1051/metal/2019063 ◽

2019 ◽

Vol 116 (6) ◽

pp. 627 ◽

Cited By ~ 1

Author(s):

Yu Liu ◽

Zhao Zhang ◽

Guangqiang Li ◽

Yang Wu ◽

Xijie Wang ◽

...

Keyword(s):

Slag Composition ◽

Molten Slag ◽

Oxide Inclusion ◽

Electroslag Remelting ◽

Slag Viscosity ◽

Oxide Inclusions ◽

Al Content ◽

42Crmo Steel ◽

Increasing Trend ◽

Inclusion Modification

Five heats were carried out to study the effects of SiO2 containing slag for electroslag remelting (ESR) on inclusion characteristics of 42CrMo steel. Fluoride vaporization at elevated temperature from slags was also explored by thermogravimetric analysis. The results show that fluoride vaporization is dominated by slag viscosity and component activities in the melt. Slag composition has an important effect on the composition of the oxide inclusion. For 70 wt% CaF2–30 wt% Al2O3 slag, the compositions of oxide inclusions in remelted steel show no obvious differences compared with the virgin steel. Whereas, SiO2 content in oxide inclusions of steel processed by slag bearing SiO2 show an increasing trend with increase of SiO2 content in 50 wt% CaF2–CaO–SiO2 slag, and the MgO · Al2O3 inclusions are modified to (Al,Ca,Mg,Si)O inclusions with low melting temperature. Al2O3 contents in oxide inclusions are also closely related to the Al2O3 concentration in the molten slag, which increase with the addition of Al2O3 in slag bearing SiO2. In testing various slags, the incorporation of slag T2 with 50 wt% CaF2–30 wt% CaO–20 wt% SiO2 shows the highest cleanliness in remelted steel. This implies that slag T2 can be a promising slag for ESR process of alloy steel requiring Al content refinement due to less fluoride vaporization from slag and better inclusions modification.

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Non-Arrhenius Viscosity Models for Molten Silicate Slags with Constant Pre-Exponential Parameter: A Comparison to Arrhenius Model

High Temperature Materials and Processes ◽

10.1515/htmp-2014-0197 ◽

2016 ◽

Vol 35 (3) ◽

pp. 261-267 ◽

Cited By ~ 2

Author(s):

Lei Gan ◽

Chaobin Lai ◽

Huihui Xiong

Keyword(s):

Low Temperature ◽

Molten Slag ◽

Slag Viscosity ◽

Arrhenius Model ◽

Exponential Parameter ◽

Viscosity Models ◽

Lower Viscosity ◽

Molten Silicate ◽

Parameter Values

AbstractThe accuracies of molten slag viscosity fitting and low-temperature extrapolation were compared between four two-variable models: Arrhenius, Weymann–Frenkel (WF), and Vogel–Fulcher–Tammann (VFT) and Mauro, Yue, Ellison, Gupta and Allan (MYEGA) models with constant pre-exponential parameter, based on a molten slag viscosity database consisting of over 800 compositions and 5,000 measurements. It is found that over wide ranges of pre-exponential parameter, the VFT and MYEGA models have lower viscosity fitting errors and much higher low-temperature viscosity extrapolation accuracies than Arrhenius and WF models. The pre-exponential parameter values of –2.8 for VFT and –2.3 for MYEGA are recommended.

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Sulfur Content of Paper Electrophoretic Fractions In Human Serum

Clinical Chemistry ◽

10.1093/clinchem/13.8.626 ◽

1967 ◽

Vol 13 (8) ◽

pp. 626-649 ◽

Cited By ~ 4

Author(s):

Samuel Natelson ◽

Rodney Stellate

Keyword(s):

Sulfur Content ◽

Blood Donors ◽

Serum Proteins ◽

Abnormal Protein ◽

Sulfur Distribution ◽

X Ray ◽

Electrophoretic Patterns ◽

The Mean ◽

Protein Staining

Abstract Instrumentation is described for scanning paper electrophoretic strips for the sulfur distribution of the fractionated serum proteins with the vacuum X-ray spectrometer. Paper electrophoretic patterns of serum proteins scanned by X-ray spectrometry for sulfur content of the various fractions and by protein staining are compared. For 26 blood donors, the mean percentages of sulfur found in the different fractions were: albumin, 1.64; and globulins: alpha1, 0.63; alpha2, 1.10; beta, 1.14; and gamma, 0.98. The procedure was then applied to the serum of patients with diseases of the liver and of the kidney, various types of malignancies, and other diseases. The percentage of sulfur in abnormal fractions varies widely. This permits, in some cases, detection of abnormal peaks which would otherwise be missed by protein staining alone. This technic should be of value in the identification and classification of abnormal protein fractions, when combined with studies by the ultracentrifuge and immuno-electrophoresis.

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