Magnetite pellet induration is a combination of complex physicochemical phenomena – oxidation, sintering and the heat transfer associated with them. ... View. Show abstract. Early Gaseous Oxygen ...
The effect of TiO2 on the crushing strength for high-Cr V-Ti magnetite pellets was studied in this paper. On one hand, the crushing strength obviously decreased with the increasing TiO2 contents. On the other hand, the crushing strength had an obvious increase after grinding treatment for the high-Cr V-Ti magnetite and titanium …
It is because the diffusion bonding of magnetite pellets (which enhance CCS of the pellet) is more during induration than that of the hematite ore pellet at low temperature. Because of this, in hematite ore pelletization, coke fines are required to give the in-situ heat for maintaining the compressive strength of the pellet. ... View all citing ...
The pellets prepared from the synthesized magnetite attain the threshold Cold Crushing Strength (CCS) of 50 kg/pellet at a lower temperature of 1050 °C in comparison to hematite pellets (1100 °C).
X-ray micro-CT images of pellet indurated at 1250 °C and 10 min residence time: (a) 3D image of the pellet; (b) hemispherical internal 3D view of the pellet; (c) 3D …
Download scientific diagram | Schematic of typical process flow sheet for magnetite pelletization from publication: Investigation of Sintering Kinetics of Magnetite pellets during...
High-quality oxidized pellets are the basis to achieve high-efficiency utilization of vanadium–titanium magnetite (VTM) ores. Bentonite was used as a binder of VTM. The main phase composition of VTM is titanomagnetite and ilmenite. When the amount of bentonite is 1%, the compressive strength and dropping strength of VTM …
In the current investigation, a novel approach of magnetization roasting of the IOBPT using sawdust biomass (SDB) (generated from the sawmill) as a carbonaceous …
Summary of relevant fundamental features of magnetite pellet oxidation: (a) When gaseous diffusion is not limiting, oxidation reaches a limiting level ("plateau") which depends on temperature and the magnetite size distribution; (b) examples of plateau levels for different concentrates, as named in the legend.[] (c) The plateau behavior can be …
On the other hand, Fig. 8(b) shows magnetite with a purity of 96%. As it is noticeable from the emission spectrum, also for the case of the magnetite, some peaks …
This study was performed to investigate the mechanism of the effect of the morphology of magnetite concentrate on the induration process and its effect on the …
In order to efficiently extract vanadium from vanadium slag, an innovative NaOH-added pellet was applied in this work to replace traditional Na 2 CO 3-Na 2 SO 4-NaCl-added pellet. It was found that the volume of NaOH-added pellet increased by 144% and many cavities were formed spontaneously throughout the pellet during the roasting …
Abstract Iron ore, pellets, and sinter were reduced with hydrogen at 800 °C to understand the degree of reduction and the mineralogical aspects. The weight loss of goethite and limonite iron ore was noticed to be lower than that of magnetite and hematite varieties. X-ray diffractometry (XRD) indicated 100 pct Fe in the case of hematite, 93 pct …
For the big sustainability questions, we provide a comprehensive, coherent view of how the transition to a low carbon, sustainable economy will affect commodity industries and regions, helping you to navigate the sustainability landscape. ... The client was concerned about the future market for magnetite pellets in blast furnaces in the …
The pellet feed composed of 70% specularite and 30% magnetite was pretreated by HPRG at 71%-product cyclic loading in a closed flow path, mixed with 2.4% bentonite and balled for 15 min under the ...
The oxidation behavior of the magnetite pellet was then predicted based on the oxidation kinetics of the magnetite concentrates. Apart from the oxidation kinetic analysis of magnetite particles, [24,33,34,35] Song and Pistorius ... From the kinetic point of view, the rate-limiting step for oxidation of magnetite in particle scale is solid-state ...
In this study, the effects of various characteristics of artificial and natural magnetite concentrates on their pelletizing behaviors were elucidated through batch pelletizing …
The results show that MgO sources have a great influence on the compressive strength of fired pellets when fired temperature is below 1 210 ℃, and the compressive strength of common magnetite ...
The pellets prepared from the synthesized magnetite attain the threshold Cold Crushing Strength (CCS) of 50 kg/pellet at a lower temperature of 1050 °C in comparison to hematite pellets (1100 °C). Also, the threshold CCS of 250 kg/pellet is attained by synthesized magnetite pellets at a lower temperature of 1250 °C compared to hematite ...
Pellets of synthesized magnetite at 1250 °C and hematite at 1360 °C have CCS > 250 kg/pellet, porosity > 25%. Synthesized magnetite pellet achieved 3.49% …
It can be seen from the test that artificial magnetite pellet has a faster oxidation, resulting in the high porosity in the produced pellet, and it requires a roasting …
The magnetite concentrate product is further cleaned by magnetic separation and then pumped to the pelletizing plant, mixed with pelletizing additives and balled to green pellets. The amount of Atrac adsorbed on the magnetite concentrate after the last magnetic separation step has been analyzed by using different, fairly …
Silicon is one of the main gangue components in iron ore, usually in the form of quartz and olivine. Numerous studies have shown that SiO2 has a two-sided effect on the consolidation of pellets during high-temperature oxidation roasting of magnetite. However, it is very difficult to capture the structural evolution and migration mechanisms during …
At the same time, in view of the rapid development of computer performance and corresponding DFT (density functional theory) ... Then, the effect of Al 2 O 3 on the oxidation performance of magnetite pellets was studied. In order to mix magnetite with different contents of alumina in the pretreatment process, the nano magnetite was first …
To expand the application of barium-bearing magnetite in pellets, the oxidation induration mechanism for barium-bearing magnetite concentrate pellets with the BaSO4 contents from 0 to 8wt pct as ...
The induration process of oxidized pellet, containing the oxidation of magnetite phase (Fe3O4) and the sintering of oxidized magnetite phase (hematite–Fe2O3), is significant to obtain sufficient ...
Hematite ore pellets require a higher induration temperature (>1300 ºC) than magnetite ore pellet because, in magnetite ore, Fe 3 O 4 gets oxidized and provides exothermic heat which enhances ...
Optical micrographs of pellet cross-sections, taken at the center of the pellets, for cases listed in Table 2 (magnification shown by 20µm marker); brighter regions are hematite, black regions ...
The heated hematite within the ore fell into the reactor and reacted with room temperature reducing gas CO or H 2 to form magnetite in the range of 450 ~ 600°C. ... View in full-text Similar ...
The magnetite, synthesized magnetite, and hematite pellets are found to cross the threshold value of 250 kg/pellet at a temperature order of about 1200, 1250, …