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

2011 ◽  
Vol 42 (6) ◽  
pp. 1150-1180 ◽  
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

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

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.

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

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1068 ◽  
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

scholarly journals Titanium Distribution Ratio Model of Ladle Furnace Slags for Tire Cord Steel Production Based on the Ion–Molecule Coexistence Theory at 1853 K

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 788
Author(s):  
Jialiu Lei ◽  
Dongnan Zhao ◽  
Wei Feng ◽  
Zhengliang Xue
Keyword(s):  
Distribution Ratio ◽  
Steel Production ◽  
High Strength ◽  
Titanium Content ◽  
Ladle Furnace ◽  
Tire Cord ◽  
Coexistence Theory ◽  
Calculation Results ◽  
Tire Cord Steel ◽  
Lf Refining

High-strength tire cord steel is mainly used in radial ply tires, but the presence of brittle Ti inclusions can cause failure of the wires and jeopardize their performance in production. In order to control the titanium content during steel production, a thermodynamic model for predicting the titanium distribution ratio between CaO–SiO2–Al2O3–MgO–FeO–MnO–TiO2 slags during the ladle furnace (LF) refining process at 1853 K has been established based on the ion–molecule coexistence theory (IMCT), combined with industrial measurements, and the effect of basicity on the titanium distribution ratio was discussed. The results showed that the titanium distribution ratio predicted by the developed IMCT exhibited a dependable agreement with the measurements, and the optical basicity is suggested to reflect the correlation between basicity and the titanium distribution ratio. Furthermore, quantitative titanium distribution ratios of TiO2, CaO·TiO2, MgO·TiO2, FeO·TiO2, and MnO·TiO2 were acquired by the IMCT model, respectively. Calculation results revealed that the structural unit CaO plays a pivotal role in the slags in the de-titanium process.

Hydrogen Variation in Molten Steel during LF Refining

2011 ◽  
Vol 695 ◽  
pp. 353-356
Author(s):  
Jian Tao Ju ◽  
Zhen Lin Lu ◽  
Min Juan Zhang ◽  
Zhao Hui Zhang ◽  
Jun Yang
Keyword(s):  
Molten Steel ◽  
Hydrogen Content ◽  
Refining Process ◽  
Ladle Furnace ◽  
Regular Pattern ◽  
Refining Slag ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Submerged Arc ◽  
Lf Refining

The hydrogen content was measured by HYDRIS hydrogen analyzer during ladle furnace (LF) refining process aiming to test the regular pattern of hydrogen variation in molten steel. The results showed that the hydrogen increased during temperature rising, Ca-treatment and soft blowing argon period, and the absolute increment were 0.64 ppm and 0.46 ppm respectively. The water in refining slag and submerged arc slag led to hydrogen increase during temperature rising period, and fast wire-feeding speed led to hydrogen increase during Ca-treatment and soft argon blowing period. In addition, during the desulfuration and alloying period, excessive large argon blowing caused the hydrogen content increasing by 0.22 ppm.

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

2021 ◽  
Vol 118 (2) ◽  
pp. 206
Author(s):  
Yu Liu ◽  
Guangqiang Li ◽  
Qiang Wang ◽  
Ru Lu ◽  
Xijie Wang ◽  
...  
Keyword(s):  
Sulfur Content ◽  
Distribution Ratio ◽  
Slag Composition ◽  
Molten Slag ◽  
Electroslag Remelting ◽  
Metal Scrap ◽  
Sulfur Distribution ◽  
Lower Viscosity ◽  
Electrolytic Manganese ◽  
Sulfur Distribution Ratio

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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