Effect of B2O3 and CaF2 on Viscosity of Ladle Refining Slag

2011 ◽  
Vol 295-297 ◽  
pp. 2647-2650 ◽  
Author(s):  
Hong Ming Wang ◽  
Ting Wang Zhang ◽  
Hua Zhu ◽  
Yong Qi Yan ◽  
Yi Nan Zhao
Keyword(s):  
Refining Process ◽  
Slag Viscosity ◽  
Mass Ratio ◽  
Refining Slag ◽  
Ladle Refining ◽  
Ladle Slag ◽  
Viscosity Measurements ◽  
Cylinder Method

To avoid slag sticking onto the snorkel during CAS-OB ladle refining process, B2O3-CaO(mass ratio equals 1:1) and CaF2-CaO(mass ratio equals 1:1) were respectively employed as modifiers added to decrease the viscosity of ladle slag. The rotary cylinder method was adopted in the viscosity measurements. The results showed that the modifiers could decrease the viscosity of ladle refining slag remarkably. At 1500°C, the viscosity of ladle slag without any modifiers is about 6.0 Pa·s. But by adding more than 10mass% CaO-B2O3 or CaO-CaF2, the slag viscosity at 1500°C could be decreased lower than 1.0 Pa·s. The mechanism of modifiers decreasing the slag viscosity was analyzed.

Research on the Viscosity of CaF2-SiO2-Al2O3-CaO-MgO Slag System by the Thermodynamic Software

2013 ◽  
Vol 634-638 ◽  
pp. 42-46
Author(s):  
Yuan She ◽  
Jian Tao Ju ◽  
Zhi Yuan Jiao ◽  
Zhao Hui Zhang
Keyword(s):  
Physical Properties ◽  
Systematic Study ◽  
Mass Fraction ◽  
Slag System ◽  
Graphite Crucible ◽  
Rotating Cylinder ◽  
Slag Viscosity ◽  
Measuring Apparatus ◽  
Refining Slag ◽  
Cylinder Method

In order to find out a method of computation on the viscosity of CaF2-SiO2-Al2O3-CaO-MgO slag system, which is accurate, rapid and convenient, a systematic study has been carried out. The refining slag samples have been made by the method of rotation-regression-orthogonal combination design during the test. When the temperature of the flux of the samples were 1600°C~1400°C, the experiment was performed by internal rotating cylinder method involving a spindle with the RTW-10 flux physical properties measuring apparatus in graphite crucible per 50°C, meanwhile, the viscosity of slag system were estimated by thermodynamic software FactSage per 50°C. Then, according to the viscosity results of calculation at 1600°C, the viscosity calculation equation was established, which was the relation of the mass fraction of every components and the value of the slag viscosity. Furthermore, the interaction of two components on the influence of the viscosity of slag was discussed.

Viscosity Determination of High Oxidizability Refining Slag and Its Buildup Solution

2010 ◽  
Vol 146-147 ◽  
pp. 1198-1201
Author(s):  
Xiao Ping Liang ◽  
Yang Jin ◽  
Yu Wang
Keyword(s):  
Melting Point ◽  
Refining Process ◽  
Refining Slag ◽  
Ladle Slag ◽  
High Crystallinity ◽  
Lower Melting ◽  
Lower Melting Point ◽  
The Relationship ◽  
Viscosity Determination

The principal purpose of this paper are to determine the viscosity of refining slag with the features of high crystallinity and strongly oxidizability, and to solve the problem that slag sticked onto the RH immersion tube during the RH refining process. Then, the fluid length method was used to determine the viscosity, and the effect of compositions on melting point and viscosity of refining ladle slag was studied. Overall, the relationship between viscosity and fluid length was acquired, and it achieved the slag with lower melting point and good fluidity which can avoid slag building-up on RH immersion tube by adjusting the basicity of refining slag to 4-5, the content of Al2O3 to 14-15% with additives.

Investigation of tungsten concentrate used for alloying in ladle refining process

1994 ◽  
Vol 65 (3) ◽  
pp. 85-89
Author(s):  
Weiqing Chen ◽  
Rongzhang Zhou ◽  
Wan-Wook Huh ◽  
Chang-Hee Rhee
Keyword(s):  
Refining Process ◽  
Ladle Refining

scholarly journals Effect of ZnO/PbO and FeOX/SiO2 ratio on the viscosity of lead smelting slags

2020 ◽  
Vol 56 (1) ◽  
pp. 27-33
Author(s):  
K. OuYang ◽  
Z.-H. Dou ◽  
T.-A. Zhang ◽  
Y. Liu
Keyword(s):  
Phase Transition ◽  
Xrd Analysis ◽  
Degree Of Polymerization ◽  
Experimental Temperature ◽  
Slag Viscosity ◽  
Ftir Analysis ◽  
Mass Ratio ◽  
Lead Smelting ◽  
Apparent Activation Energies ◽  
Slag Melting

The effect of ZnO/PbO and FeOX/SiO2 on the viscosity of the PbO-ZnO-Fe3O4-SiO2-CaO slag was measured using the rotating spindle method. The slag viscosity decreased with decreasing ZnO/PbO mass ratio because of the depolymerization of the silicate structures. The viscosity decreased with increasing FeOX/SiO2 mass ratio as the experimental temperature was above 1623 K, while the viscosity increased significantly with the increase of FeOX/SiO2 as the experimental temperature below 1623 K because of the phase transition and the change of slag melting point. According to XRD analysis of as-quenched slag, the spinel and the zincite phase increased with increasing FeOX/SiO2. Increasing ZnO/PbO and FeOX/SiO2 could enhance the crystallization capacity of the slag. FTIR analysis revealed that the degree of polymerization of the as-quenched slags decreased with decreasing ZnO/PbO and increasing FeOX/SiO2. The temperature dependencies of the viscosity on ZnO/PbO and FeOX/SiO2 were investigated, and the apparent activation energies of each system were found to be between 169.5 to 227.4 KJ/mol, and 151.1 to 676.4 KJ/mol, respectively.

scholarly journals Effect of Na2O and Rb2O on Inclusion Removal in C96V Saw Wire Steels Using Low-Basicity LF (Ladle Furnace) Refining Slags

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 691 ◽  
Author(s):  
Changyong Chen ◽  
Zhouhua Jiang ◽  
Yang Li ◽  
Meng Sun ◽  
Kui Chen ◽  
...  
Keyword(s):  
Melting Zone ◽  
Refining Process ◽  
Ladle Furnace ◽  
Refining Slag ◽  
Dramatic Decrease ◽  
Inclusion Removal ◽  
Wire Steel ◽  
Al2o3 Inclusion ◽  
Lf Refining ◽  
Slag Entrapment

Inclusion removal and modification of C96V saw wire steel using Na2O- and Rb2O- containing novel low-basicity LF (ladle furnace) Refining Slags have been researched. The results indicated that the addition of Na2O deteriorates inclusion removal; by contrast, the addition of Rb2O seems to significantly enhance inclusion removal. In detail, Rb2O can improve the cleanliness in the as-quenched C96V saw wire steel melts compared to preexisting synthetic LF refining slag compositions: (i) The average inclusion diameter experienced a remarkable decrease after reaction between the liquid steel and the synthetic LF refining slag; (ii) In addition, the number of inclusions also suffered from a dramatic decrease, with the reaction time increasing from 900 to 2700 s (15 to 45 min); (iii) Furthermore, both of the MnO-SiO2-Al2O3 and CaO-SiO2-Al2O3 inclusion system mainly concentrated in the low melting zone when the composition of Rb2O in synthetic refining slag was ≥5.0 wt%. This is mainly because Na2O significantly reduces the viscosity of refining slag, while Rb2O increases it. Then, there are two remarkable influences causing the increase of viscosity of refining slag with the addition of Rb2O: the inclusions can be sufficiently entrained within the slag once absorbed due to the significant increase in the viscosity; and the slag entrapment during refining process weakened dramatically.

scholarly journals Mixing and mass transfer in ladle refining process.

1989 ◽  
Vol 29 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Kanehiro Ogawa ◽  
Toshio Onoue
Keyword(s):  
Mass Transfer ◽  
Refining Process ◽  
Ladle Refining

Study on the separation of silicon from refining slag of industrial silicon

2021 ◽  
Vol 118 (4) ◽  
pp. 402
Author(s):  
Yong Hou ◽  
Guo-Hua Zhang ◽  
Kuo-Chih Chou
Keyword(s):  
Environmental Pollution ◽  
High Viscosity ◽  
Density Variation ◽  
Slag Viscosity ◽  
Separation Condition ◽  
Refining Slag ◽  
Separation Effect ◽  
Factors Affecting ◽  
Determining Factor ◽  
Optimum Separation

During the process of production and refining of industrial silicon, the discharged slag usually contains more than 15 mass% of metallic silicon. However, the separation of silicon from slag is very difficult due to the close density of silicon and slag as well as the high viscosity of slag, which results in the waste of resources. In the present work, the effect of Na2O addition on the separation of silicon from slag is investigated in detail. It is found that the optimum separation condition of slag and silicon is 1723 K reacting for 60 min by adding 10 mass% Na2O to the slag. Viscosity and density are two important factors affecting the separation effect of silicon from slag. The addition of Na2O reduces the viscosity of slag and promotes the separation of silicon from slag. Even if the addition of Na2O will decrease the density of slag which is detrimental to the separation of silicon, the density variation is not the determining factor affecting the separation relative to viscosity. The separation and extraction of metallic silicon from silicon slag is of great significance for improving utilization of resources and reducing environmental pollution.

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.

Comments on the use of molybdenum components for slag viscosity measurements

2001 ◽  
Vol 72 (3) ◽  
pp. 215-225 ◽  
Author(s):  
D. French ◽  
H.J. Hurst ◽  
P. Marvig
Keyword(s):  
Slag Viscosity ◽  
Viscosity Measurements
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