SOME ASPECTS OF THE PRODUCTION OF FERROCHROME …
The chromite ore Cr/Fe ratio is of importance as it directly affects the alloy Cr grade whilst the gangue elements affect the melting energy and rate as well as the slag chemistry. The chromite spinel ore morphology can be described stoichiometrically as (Fe, Mg)(Cr,Al,Fe)2O4 and chromite ores often contain gangue elements of SiO2 and MgO.
اقرأ أكثرEffects of Al2O3 and MgO on Softening, Melting, and Permeation ...
The high pressure loss in the cohesive zone decreases the gas permeability and affects the productivity of blast furnace. ... increasing softening temperature and decreasing dripping temperature of the iron ore are desired. In this study, softening, melting, and permeation of SiO2-FeO-CaO-Al2O3-MgO on a coke bed were investigated. The oxide ...
اقرأ أكثرeffects of a high mgo al2o3 in chrome ore - ps16gdynia.pl
Global trader of Chrome Ore/ manganese ore/ iron ore,, Mil scale, fe 6377 %, sio2 321%, Al2O3 183 %, cao 270 %, MGO 019%, s 002%, High Fi Minerals Export,... Synthesis and sintering of chromium-free complex spinels, - Know More
اقرأ أكثرEffect of MgO and Al2O3 variations in oxygen steelmaking …
metal and high MgO slag (7–11per cent MgO) practice. In the case study-4, data from 4 steel plants is analysed to study the effect of MgO and Al 2O 3 on slag morphology at tap and the distribution of phosphorus in different phases, including the precipitation and dissolution of dicalciumsilicate. Plant data for case study-1: low initial ...
اقرأ أكثرStudy of the effect of the MgO/Al2O3 ratio on viscosity of blast ...
The effect of the MgO/Al2 O3 ratio on the viscosity of blast furnace slag was studied systematically at temperatures of 1773 K and below under the conditions of the same Al2 O3 content and binary basicity. The results showed that the viscosity and the melting temperature of the slag first decreased, then increased, while the MgO/Al2 O3 ratio decreased from 0.90 to …
اقرأ أكثرEffect of high MgO/Al2O3 ratio (1.2 to 2.2) on sintering …
the utilization rate of this kind of high-magnesium ore and expand its ratio in sintered iron-containing raw materials, it is of great significance to study the effect of high MgO/Al 2 O 3 ratio on sinter performance. In recent years, many investigations on the effects of MgO and Al 2 O 3 on sintering behavior have been carried out [7-12].
اقرأ أكثرCrystals | Free Full-Text | Effects of Basicity and Al2O3 Content on ...
The CaO-SiO2-MgO-Al2O3 slags with high alumina content are widely applied in various pyrometallurgical processes. However, for super-high-alumina slags, especially for those with alumina content of more than 25 wt%, there is a lack of relevant studies about the properties of slag. The melting behavior, viscosity, structural property, and crystallization behavior of …
اقرأ أكثرMolecular Dynamics Simulation on the Effect of MgO/Al2O3 …
The SiO2-Al2O3-CaO-MgO is the basic structural system of blast furnace slag and the composition directly affects the performance of the slag. Molecular dynamics simulations were carried out to analyze the local structure, structural unit, bond angle, transport properties, and enthalpy of the slag with the increase of MgO/Al2O3 mass ratio under different basicity …
اقرأ أكثرEffect of MgO/Al2O3 ratio on the structure and properties of blast ...
SiO 2-Al 2 O 3-CaO-MgO is the most significant slag system in the blast furnace ironmaking process and it is very important to investigate the microstructure and viscosity of the system.In this paper, molecular dynamics simulations were carried out to explore the effects of MgO/Al 2 O 3 ratio on structure and properties of the system. Based on the self-diffusion …
اقرأ أكثرEffects of MgO/Al2O3 ratio on viscous behaviors and structures of MgO …
The effects of MgO/Al 2 O 3 ratio on the viscous behaviors of MgO–Al 2 O 3 –TiO 2 –CaO–SiO 2 systems were investigated by the rotating cylinder method. Raman spectroscopy was used to analyze the structural characteristics of slag and Factsage 7.0 was adopted to demonstrate the liquidus temperature of slag.
اقرأ أكثر[PDF] Effect of MgO and Al2O3 variations in oxygen steelmaking …
Abstract Operational data of BOF and the slag samples for different starting conditions of phosphorus (0.06–0.26%P) and silicon content (0.3–1.2%Si) of hot metal have been analysed. The contribution of parameters which are well known to affect phosphorus distribution at tap, such as basicity, temperature, FeO content of slag, slag mass etc., is investigated …
اقرأ أكثرEffect of high MgO/Al2O3 ratio (1.2 to 2.2) on sintering behavior …
Effect of high MgO/Al2O3 ratio (1.2 to 2.2) on sintering behavior and metallurgical properties Uticaj visokog odnosa MgO/Al2O3 (1,2 do 2,2) na ponašanje prilikom sinterovanja i na metalurške osobine Ju J.-T., Tang C.-M., Pang Z.-G., Xing X.-D., Ji G.-H. Xi'an University of Architecture and Technology, School of Metallurgical Engineering, Xi ...
اقرأ أكثرEffects of Al2O3 and MgO on Softening, Melting, and Permeation ...
The high pressure loss in the cohesive zone decreases the gas permeability and affects the productivity of blast furnace. ... increasing softening temperature and decreasing dripping temperature of the iron ore are desired. In this study, softening, melting, and permeation of SiO 2-FeO-CaO-Al 2 O 3-MgO on a coke bed were investigated. The oxide ...
اقرأ أكثرEffect of High Al2O3 Slag on the Blast Furnace Operations
The effect of Al2O3 and the Al2O3/SiO2 ratio on the viscosity, surface tension and sulfide capacity of the CaO–SiO2–Al2O3–MgO–TiO2 blast furnace slag system were studied in the present work.
اقرأ أكثرEffect of MgO on Highly Basic Sinters with High Al2O3
Download Citation | Effect of MgO on Highly Basic Sinters with High Al2O3 | The increase of the proportion of high Al2O3 content iron ore fine in iron and steel enterprises has brought about a ...
اقرأ أكثرEffect of MgO/Al2O3 ratio on the structure and properties …
SiO 2-Al 2 O 3-CaO-MgO is the most significant slag system in the blast furnace ironmaking process and it is very important to investigate the microstructure and viscosity of the system.In this paper, molecular dynamics simulations were carried out to explore the effects of MgO/Al 2 O 3 ratio on structure and properties of the system. Based on the self-diffusion …
اقرأ أكثرEffect of High Al2O3 Slag on the Blast Furnace Operations - J …
For these reasons, the high Al 2 O 3 in the sintered ore with CaO/SiO 2 and MgO adjusted was manufactured to provide the test. 2.2. Used Materials Tab le 1indicates each composition of high Al 2 O 3 sinter, ore, auxiliary material, coke, and pulverized coal that were used for the test operation. The oil coke with no ash content, having a high ...
اقرأ أكثرEffect of high MgO/Al2O3 ratio (1.2 to 2.2) on …
The index would reach the peak value with the strength of 70.6% and the yield of 83.81%, respectively, when MgO/Al 2 O 3 ratio was 1.8. The reduction index would reach the peak value of 88.54% with MgO/Al 2 O 3 ratio of 1.6. The FeO content, solid fuel consumption, and the RDI +3.15 of sinter increased dramatically with increasing MgO/Al 2 O 3
اقرأ أكثرEffects of Al2O3 and MgO on Softening, Melting, and Permeation ...
The effects of Al 2 O 3 and MgO addition, reduction ratio, and CaO/SiO 2 ratio of the oxide were studied. Differences between the softening and solidus temperatures, and the melting and liquidus temperatures were determined by comparing the experimental findings with the calculation results based on a thermodynamic database.[ 12 ]
اقرأ أكثر(PDF) Effects of CaO, MgO, Al2O3 and SiO2 on the
CaO could enhance the reduction because Ca2+ would replace Fe2+, thus facilitated the ion diffusion in solid phase. Al2O3 had a positive influence as well, since Al3+ could form a solid solution...
اقرأ أكثرEffect of MgO on Highly Basic Sinters with High Al2O3
The increase of the proportion of high Al2O3 content iron ore fine in iron and steel enterprises has brought about a series of problems such as the increase of the viscosity of blast furnace slag and the difficulty of the separation of slag and iron. In order to solve this problem, the effect of increasing MgO content on the technical and economic index, the cold strength, and …
اقرأ أكثرEffect of high MgO/Al2O3ratio (1.2 to 2.2) on sintering behavior …
Abstract. The sintering pot test was used to investigate the effect of MgO/Al2O3 ratio in the range of 1.2 to 2.2 on the sintering behavior of iron ore. The main characterization methods of X-ray diffraction (XRD) and scanning electron microscopyenergy disperse spectroscopy (SEM-EDS) were employed. The results showed that the strength, yield ...
اقرأ أكثرEffect of Chrome Ore Quality on Ferrochrome Production …
A lower MgO/Al2O3 ratio means a more dense chrome ore. For the MgO/Al2O3with the Cr2O3in the ore the trend is opposite (Figure 2). Since the Al2O3content of the ore has positive correlation with Cr2O3, the MgO/Al2O3ratio increases with reduction in Cr2O3content. Thus, as the Cr2O3and Al2O3decreases, the MgO increases. Table 1.
اقرأ أكثرQuantitative Investigation of MgO, Al2O3 and SiO2 Effects on …
Secondary hematite (SH) is a serious factor resulting in reduction degradation of iron ore sinter in a blast furnace; however, until now, a quantitative study for SH formation had not been reported. In this work, the effects of gangue composition, including MgO, Al2O3 and SiO2, on the solid-state formation in the sintering process of iron ore fines were investigated quantitatively. It …
اقرأ أكثرEffect of MgO on Highly Basic Sinters with High Al2O3
The experimental results show that when the MgO content fraction in the sinter with high basicity and high aluminum increases from 1.72 to 2.49%, the vertical sintering speed decreases by 4.38mm/min, the utilization coefficient decreases by 0.51t/ (m 2 h), and the low-temperature reduction degradation index increases by 6.7%.
اقرأ أكثرDissolution Behavior of Chromium Ore in CaO-SiO2-MgO-Al2O3 …
Key words: chromium ore, smelting reduction, dissolution rate, dissolution mechanism, slag : CaO-SiO2-MgO-Al2O3,,.,,0.8~1. ...
اقرأ أكثرHighly Effective Pd/MgO/γ-Al 2 O 3 Catalysts for CO Oxidative …
The support of MgO/γ-Al 2 O 3 was initially prepared by a multiple impregnation method and Pd was placed on the surface of the MgO/γ-Al 2 O 3 support via incipient wetness impregnation. Pd/MgO/γ-Al 2 O 3 (Pd/MAO) catalysts were systematically characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), CO 2-temperature-programmed desorption …
اقرأ أكثرEffect of Al2O3 and FeO composition on RDI in sintering process …
When Al2O3 content was higher than 1.95%, RDI increased 0.5% with 0.1% increments in Al2O3. The works refer to that control of sinter RDI at high Al2O3 contents of greater than 1.95% will be very difficult for the plant operator. It was however possible to achieve RDI control by correcting basicity and MgO contents of the raw sinter mixture.
اقرأ أكثرeffects of a high mgo al2o3 in chrome ore - goldenhelix.pl
Effect of SiO2 on the reduction of chromite sinter for, Production of a better quality ferro-chrome requires using high-grade chromite ores but these are fragile and tend to form fines during handling In order to utilize these fines direct sintering of chromite fines has been carried out to produce fluxed sinter which contains 36 Cr2O3, 20 FeO, 8 SiO2, 9 MgO, 11 Al2O3, 6 CaO etc...
اقرأ أكثرCrystals | Free Full-Text | Evaluating the Effect of MgO/Al2O3
In order to clarify the effect of the MgO/Al2O3 ratio on the fluidity of a low-alumina blast furnace slag system, the influence law of slag fluidity with different MgO/Al2O3 ratios was studied based on the composition of blast furnace slag through a viscosity experiment and themodynamic software. By studying the effect of the MgO/Al2O3 ratio on the activation …
اقرأ أكثرEffects of MgO/Al2O3 Ratio and Basicity on the ... - SpringerLink
The effects of the MgO/Al2O3 ratio and basicity on the viscosities of CaO-MgO-SiO2-Al2O3 slags were investigated at 1733 K, 1773 K, and 1823 K (1460 °C, 1500 °C, and 1550 °C) in this study. At a fixed Al2O3 of 15 and 18 mass pct, increasing the basicity from 1 to 1.2 resulted in lowering the viscosity of slags. At a fixed basicity of 1.0 and 1.2, increasing the …
اقرأ أكثرThe effects of MgO and Al2O3 behaviours on softening–melting …
ABSTRACT Because the behaviours of MgO and Al2O3 during slag formation of high basicity sinter are not clearly understood, the effects of MgO and Al2O3 on softening-melting properties are always arguable. In this paper, four kinds of sinter containing different MgO and Al2O3 content are investigated. Some observations are obtained. The mechanism of the influence of …
اقرأ أكثرEffect of w(MgO)/w(Al2O3) ratio and basicity on microstructure …
The CaO–SiO2–Al2O3–MgO system is the main component unit in the slag formation process in blast furnace smelting. Its structural changes directly affect the high-temperature metallurgical properties of slag. Molecular dynamics simulations were thus conducted to analyze the microstructure changes of the quaternary slag system under different basicities …
اقرأ أكثرEffect of high MgO/Al2O3 ratio (1.2 to 2.2) on …
Effect of high MgO/Al 2 O 3 ratio (1.2 to 2.2) on sintering behavior and ... grade iron ore with high-alumina has matured in steel enterprises, while the …
اقرأ أكثرQuantitative Investigation of MgO, Al2O3 and SiO2 Effects on …
Secondary hematite (SH) is a serious factor resulting in reduction degradation of iron ore sinter in a blast furnace; however, until now, a quantitative study for SH formation had not been reported. In this work, the effects of gangue composition, including MgO, Al2O3 and SiO2, on the solid-state formation in the sintering process of iron ore fines were investigated …
اقرأ أكثرEffects of CaO, MgO, Al2O3 and SiO2 on the carbothermic …
The basic component in chromite ore is FeCr2O4 with gangue component like MgO and Al2O3. In lack of clear and consistent explanation about the effect of addition on the reduction of FeCr2O4, investigation of synthetic FeCr2O4 with different kind and amount of additions was carried out at 1673K under isothermal mode.
اقرأ أكثرEffect of Al2O3, MgO, and CaO/SiO2 on Viscosity of High …
The effects of Al 2 O 3, MgO, and binary basicity on the viscosity of high alumina blast furnace slag are studied systematically at the temperatures of 1773 K and below using the orthogonal experimental design method.The results show that, at fixed binary basicity (CaO/SiO 2) between 1.1 and 1.2, higher Al 2 O 3 content increase the slag viscosity due to the …
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