Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
Read More
Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
Read More
By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
Read More
Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
Read More
Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
Read More
The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
Read More
Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
Read More
The strength and reducibility properties of iron ore sinter are obtained by liquid phase sintering. The silico-ferrite of calcium and aluminum (SFCA) is the main bonding phase ... magnetite, silico-ferrite of calcium and aluminum (SFCA), dicalcium silicate (C2S), etc. ... nents in iron ore, and their content is in the range 0.35–56 and …
Details
Request PDF | Improvement of Sinter Strength and Reducibility through Promotion of Magnetite Ore Oxidation by Use of Separate Granulating Method | In general, Fe content in iron ore is gradually ...
Details
The steel industry represents about 7% of the world's anthropogenic CO 2 emissions due to the high use of fossil fuels. The CO 2-lean direct reduction of iron ore with hydrogen is considered to offer a high potential to reduce CO 2 emissions, and this direct reduction of Fe 2 O 3 powder is investigated in this research. The H 2 reduction …
Details
The current practise of magnetite ore agglomeration involves high temperature oxidation roasting (typically at 1200 to 1350 °C) of magnetite to hematite phase in order to improve the strength and reducibility of pellets. The requirement to pre-oxidize the magnetite before introduction to an ironmaking plant increases the CO 2
Details
Abstract Two iron ore samples from Nigeria have been examined using TG, DTA, EGA, XRD, and optical and electron microscopy. Itakpe iron ore is hematite-rich, this mineral being intergrown with magnetite, and silica is the major impurity. Agbaja ore is an acidic oölite ore consisting of goethite and magnetite, with alumina, silica and phosphorus as …
Details
Composition: Iron ore is primarily composed of iron, usually in the form of iron oxides such as hematite (Fe2O3), magnetite (Fe3O4), or goethite (FeO (OH)). It may also contain other elements or minerals as impurities, such as silica, alumina, phosphorus, sulfur, and trace elements. Physical properties: Iron ore is usually hard, dense, and heavy.
Details
The reduction roasting of goethitic-hematite iron ore could produce high-grade magnetite with LOI removal, which is more suitable for pellet making. ... Usually, the porosity is significant for the iron ore pellets regarding reducibility, while pellets are considered for the BF/DRI process [37, 38]. However, excess porosity …
Details
The results show that, the reduction of iron ore has been considered in three elementary steps, namely hematite to magnetite, magnetite to wustite and wustite to iron. Thermal analysis data identified the individual thermal reaction regions associated with developments of individual iron phases during the heating and were used to calculate …
Details
Materials. Hematite iron ore fines (− 15 mm) assaying Fe 2 O 3 —92.5 wt pct, Al 2 O 3 —3.7 wt pct, SiO 2 —2.94 wt pct, and LOI—4.9 wt pct were procured from one of the mines of Tata Steel Jamshedpur, India. Sieve analysis of the iron ore and charcoal as per ASTM C136-01 is presented in Figure 1(a) and (b). Charcoals were prepared at the …
Details
The highest reducibility value for the Itakpe iron ore was 74.33 per cent with the corresponding temperature at 1000 ºC fired for 120 minutes, while the highest reducibility value for the Agbaja ...
Details
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 …
Details
1. Introduction. Iron ores, according to the iron content and the level of impurities, can be divided into two groups. The first group is high-grade iron ores containing high iron content and low content of impurities (Беспояско, 2014).This type of ore is quickly exhausted, since it is widely used in a blast furnace process for iron smelting.
Details
Through magnetite concentration deteriorates reducibility because of high FeO content in sinter product. Such situation makes it to promote oxidation of magnetite iron ore during sintering process for improving sinter reducibility. In addition, promoting oxidation of magnetite possibly increases sinter strength with using oxidation heat.
Details
High reducibility Size distribution and mean particle size ... (Fe 2 O 3) to magnetite (Fe 3 O 4) commences with the increase in temperature and decrease in oxygen partial potential in the shaft. ... In a DR process, iron ore pellets and/or lump iron ores are reduced by a reducing gas to produce DRI or hot briquetted iron (HBI). Depending on ...
Details
Iron ore pellets are made from both magnetite and hematite ores. Hematite ores are concentrated using a flotation process. Pellets include a mineral binder that represents about 2% by weight.
DetailsIn general, the reduction of Fe 2 O 3, called hematite, does not occur directly to metallic iron, Fe.If the reduction temperature is lower than 570 °C, reduction to Fe occurs stepwise from Fe 2 O 3 to Fe 3 O 4, called magnetite, and continues to Fe.The intermediate oxide, wüstite Fe (1−x) O, is not stable at temperatures lower than 570 °C. At reduction …
Details
First stage correspond to dehydroxylation at around 300 °C and second stage corresponds to reduction of iron ore at around 625 °C and 825 °C or 880 °C. The composite lost of 4.64 % and 2.85 % ...
Details
The highest reducibility value of the resultant pellet for the Itakpe iron ore value was 99.7% with the corresponding temperature at 1000 o C and time rate of 120mins, while the highest ...
Details
T ecnológico 1500, 58120, Morelia México. [email protected]. ABSTRACT. Experimental work has been carried out to measure. the reducibility of two types of iron ore concentrates. employing ...
Details
The raw magnetite-based iron ore was pre-oxidized at 800 and 1000 °C for a certain time to reach a partly oxidation and deeply oxidation state. ... reducibility of magnetite-based iron ores are ...
Details
The reducibility of hematite and limonite-based ores is nearly equivalent at high reduction temperatures, Figure 1b. However, the limonite ore showed a lower reduction rate at lower temperatures. ... Due to technical issues, the pre-melting period of the magnetite iron ore could not be measured.
Details
KEY WORDS: sinter; magnetite; separate granulation; reducibility; sinter strength; concentration; iron ore. netite iron ore than other methods, for example, flotation method. Since magnetic iron ore is generally magnetite (Fe 3O 4), we have focused on it. Generally, in case of high blending ratio of magnetite ore in sinter mixture, Fe2+ in the ...
Details
Sinter quality is a key element for stable blast furnace operation. Sinter strength and reducibility depend considerably on the mineral composition and associated textural features. During sinter optical image analysis (OIA), it is important to distinguish different morphologies of the same mineral such as primary/secondary hematite, and …
Details
The available ores are becoming much more expensive and the quality is decreasing. The global production of magnetite iron ore in 2015 is 583 million tons, which accounts for 28% of the total iron ore production. It is time to come up with an idea to use lower-cost iron ores with sufficient reserves for ironmaking. [4, 5]
Details
iron ore. Fig. 3.3 : Effect of size of ore on degree of reduction. Iron ore and agglomerates as charge material should be resistant to abrasion. If they break into finer fractions due to impact, abrasion, compression and volume change within the furnace, the smaller particles result in choking of voids thereby affecting reduction and productivity.
Details
However, when magnetite ores were used as feedstock, several process parameters showed influences on Hydrogen-based direct reduced iron (HyDRI) produced by fluidized bed has great potential for achieving the target of net-zero carbon in steelmaking.
Details
The developed pellet also shows better reducibility (80%), similar reduction degradation index (18%) and swelling index (10%) to the usual bentonite pellet. ... magnetite iron ore mine materials ...
Detailswhere M Fe is the mass of iron in a unit volume of ore, A r is the reducibility factor of ore (11.44 × 10 –3 s −1), E r is the activation energy for the reduction reaction of iron ore by CO (33 kJ/mol), f is the degree of reduction, P o CO2 is the actual CO 2 partial pressure in the gas phase, and P eq CO2 is the CO 2 partial pressure in ...
Details
The strength and reducibility properties of iron ore sinter are obtained by liquid phase sintering. ... leading to greater assimilation of the iron ore particles. Lower magnetite was found for ...
Details
The main results obtained are described as follows: (1) "Separate Granulation" in case that magnetite is pre-granulated with high Al2O3 iron ore without limestone and coke breeze resulted in ...
Details
The optimum condition is that the magnetite iron ore is deeply oxidized at 800 °C, mixed with 1.5 wt.% of MgO powder, and reduced in the fluidized bed at a gas velocity of 0.45 m/s.
Details
The iron ore deposit consists of mainly magnetite mineral. Hematite is the second iron oxide found in the deposit. The gangue minerals contain mainly SiO2 and Al2O3 impurities.
Details
This is because the porosity of sinter affects the reducibility of iron ore to pig iron, while its morphological characteristics affect the reducibility and strength of the iron-bearing material in blast furnaces. ... The differentiation between magnetite and hematite is primarily based on the surface characteristics of iron oxides being ...
Details
Porosity of closed pores ranged from 5.1% to 9.82% and after reduction 32.77% to 44.12%. Density was measured in the range from 3.65 to 3.82 g cm −3 and for reduced samples from 4.87 to 5.37 g cm −3. 3. The maximum porosity was measured in sample with the highest reducibility index and basicity.
Details
The main results obtained are described as follows: (1) "Separate Granulation" in case that magnetite is pre-granulated with high Al 2 O 3 iron ore without limestone and coke breeze resulted in decrease of FeO in sinter and improvement of both sinter reducibility and sinter strength. (2) Sinter micro structure featured restriction of pore ...
Details
Effect of mineral composition and pore structure on reducibility of composite iron ore sinter. ISIJ Int. (2009) View more references. Cited by (57) ... Vanadium‑titanium magnetite, a kind of composite ore with iron, vanadium and titanium, has not been utilized on large scale by steel plants. An efficient and clean utilization …
Details
Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
You can leave your message here, we'll send you an Email immediately.
Online ChatCopyright ©2000- 2024 Shanghai Sofol CompanySitemap
PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
GET QUOTE