Physicochemical properties of the iron ore pellets depend on the iron oxide concentrate, gangue content and the amount of fluxes added. The objective of this present work is to study the reducibility as well as the softening–melting behavior of the iron ore bearing fines (mainly containing hematite) pellet with lime to silica ratio (C/S) varying …
In this case, the properties of iron ore sinter such as reducibility and strength need to be optimized because hydrogen reduction of iron oxide is an endothermic reaction and temperature ...
design parameters govern the strength and reducibility of pellets after firing, and those influence is ana- ... viability of the pellet-sinter co-production. KEY WORDS: carbon core pellet; co-production; highly reducible sinter. ore with few gangue and harmful elements without lowering ... Concentrated iron ore 66.7 0.78 1.95 0.32 0.06 0.12 2. ...
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 found in modern iron ...
In comparison to sinter and iron ore, pellets exhibit uniform shape and size. However, pellets also exhibit higher swelling index that poses serious problems during the blast furnace operation. ... However, high slag formation in the pellets may have a negative impact on the reducibility. As the pellet's pores might be filled with the slags ...
Determination of Softening & Melting Characteristic of Iron ore lumps/ Pellets/Sinter; Application : Iron Ore, Lumps, Sinter and Pellet ; RI/RDI Test Apparatus . View Project. RI/RDI Test Apparatus . Standard : IS – 8167:1989, 10823 & ISO: 4696 ; Determination of Reducibility index/low temperature reduction disintegration index by static ...
During iron ore sintering the green granulated sinter bed undergoes significant changes in its structure and mineralogy due to the formation of liquid in the flame front. These changes influence the sinter reducibility, which is an important parameter influencing the productivity and fuel efficiency of the blast furnace. Bulk measurement of sinter product …
iron ore sinter. Ideally, high-quality sinter must be physically strong, easily reduced (i.e., high per- meability allowing the passing of reduction gases) and chemically compatible with the
microanalysis; EPMA). The reducibility of the ana-logue sinter tablets was also measured, and the relationship between mineralogy, texture, and reducibility is discussed. EXPERIMENTAL Sinter Analogues Sinter analogues designed to simulate the bond-ing phase in iron ore sinter were prepared from Australian iron ore fines using an infra …
Reducibility of high MgO sinter was also found to be high; it was found that calcium ferrite (CF) contained more Si and Mg ions with increasing MgO in sinter. ... Narita et al. investigated the effect of MgO content on the permeability resistance of iron ore pellets in the softening–melting zone of blast furnace.
The BF pellet premium over sinter feed (CFR China) ranged from a little over $10/ton in January-February 2016 to about $35/ton in August 2016 and went on a rampage beginning in May 2017, ... Vale's operational …
Iron ore pellets, sinter and lump ore comprise the main burden of modern blast furnaces. Iron ore pellets are small and hard spherical particles agglomerated from a fine iron ore concentrate. ... The reducibility of the pellets was dynamically tested in a CO-CO 2-N 2 gas from room temperature up to 1100 °C, simulating the average BF …
In order to examine what kind of mineral composition and pore structure are desirable from the viewpoint of the reducibility of the composite iron ore sinter, the hydrogen reduction experiments are conducted at 1173 K. The reduction rate of the composite iron ore sinter, which is composed of the dense pre-granulated pellet and …
Twenty different iron ore pellets, consisting primarily of Hematite (Fe2O3) phase, were subjected to 'simulated' reduction studies. A wide range of reduction time periods, Rt of 122 to 211 minutes, were obtained. Detailed microstructural characterizations were then conducted at different locations of ten selected specimens. The Rt did not …
The work investigated the relationship among the porosity, swelling and sintering behaviors of Mn ore pellets and the effects of these on reducibility. Effects of CaCO 3, powder particle size and temperature on the porosity of Mn ore pellets were evaluated. The following conclusions were drawn.
DR Pellet Size Exceeds BF Pellet Size. DR pellets: >50 % + 12.5 mm vs. BF: 9.5 x 12.5 mm target. Benefits of larger pellets : Increase in permeability, increased yield ( fewer smaller pellets degrading into fines), reduced clustering tendency (with a decrease in contacting surface area) Drawbacks of larger pellets :
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 ... Iron ore sinter has a complex microstructure and comprises hematite, magnetite, silico- ... Pellet USA 63 8.1 0.4 0.003 0.025 - [24] Mesabi USA 57.5 10.1 0.7 …
Title of Legally Binding Document: Determination of relative reducibility of iron oxides:lump ore,sinter and pellets Number of Amendments: Equivalence: Superceding: Superceded by: LEGALLY BINDING DOCUMENT Step Out From the Old to the New--Jawaharlal Nehru Invent a new India using knowledge.--Satyanarayan …
The best way to evaluate the reducibility of a pellet is to test it in a laboratory. Metallization or the degree of reduction of the pellet has an impact on the energy consumption of the EAF steelmaking furnace. DRI metallization is defined as the percentage of metallic iron in the reduced pellet divided by the total iron in the reduced pellet.
A sample of iron ore sinter was collected from a belt cut of the conveyor that feeds the industrial chute system of a plant located in India. Sinter particles are more prone to degradation than other iron agglomerates. This may be attributed to the inherent porous structure of the sinter [9].
Together with lump iron ore and pellets, iron ore sinter is one of the major feeds for the production of iron in the blast furnace and can constitute up to 70–85% of the total ferrous burden. ... T. Influence of Mineralogy and Pore Structure on the Reducibility and Strength of Iron Ore Sinter. Ph.D. Thesis, University of Newcastle, Callaghan ...
In this study, the effect of the radial charging position on the reducibility of acid iron ore pellets was investigated using a laboratory-scale, high-temperature furnace in CO-CO2-N2 and CO-CO2-H2-H2O-N2 atmospheres up to 1100 °C. ... T. Reduction of Iron Ore Pellets, Sinter, and Lump Ore under Simulated Blast Furnace Conditions. Steel …
Abstract. In iron making process, sintering of iron ore fines is an integral step to utilize not only the ore fines but also to introduce a part of flux (limestone and dolomite) along with the sinter in blast furnace burden. In this way, the productivity of the furnace considerably improves. In this paper, some fundamental aspects such as the ...
In this study, pellets were produced with iron ore from Noamundi, India. Size distribution and chemical analyses (sampling standard IS 1405-1982) of the iron ore fines are presented in Tables 1 and 2, respectively.Several fluxes viz. pure MgO, waste magnesite brick (WMB) and olivine powder (−100 mesh) were used as a source of MgO …
Sintering is the most widely used agglomeration process for preparing iron ore fines for blast furnace applications. We are using our expertise in iron ore sintering and evaluation of blast furnace burdens to assist industry to maximise the value of their resources, optimise product quality and reduce their environmental footprint.
In order to clarify the influence of nut coke on the pellets reducibility, industrial iron ore pellets were reduced with and without nut coke participation under different temperatures and ...
Figure 1. Iron ore pellets. Porosity Characterization of Iron Ore Pellets by X-Ray Microtomography 3. A spatial resolution of approximately 8 µm was reached with the 0.4X lens for a total scan time of 10.6 h. For the 4X lens a resolution of approximately 4 µm was achieved, for total scan time of 5.9 h. All analyzes in this step were performed ...
Once the sintering process was completed, the cooled sinter was discharged and tested to determine the sintering indexes, such as productivity, tumble strength (ISO 3271–1995), and solid fuel consumption [20, 23].The reducibility index (RI) and low-temperature reduction degradation index of sinter, pellet, lump ore, and their …
50.3.1.1 Example—Burden Distribution Change. Iron ore sinter /pellets are redirected from the wall of the blast furnace to the center using the bell-less top charging equipment. The top gas utilization (TGU) improves from 47.5 to 49.0% (an increase of 1.5%) due to better contact of the ferrous burden with the CO-rich gas in the furnace center.
Iron ore concentrate of average size less than 100 µm was generated through beneficiation of goethite ore of Bolani iron ore mines. Green pellets of size 9–16 mm were produced in a laboratory disc pelletiser of 1 m diameter using the ore fines of minimum blaine value i.e. degree of fineness of the iron ore of 2000 cm 2 /g with 0.6% …
The BF is charged with metallurgical coke and iron burden materials including iron ore pellets, sinter, and lump ore. While … Expand. 20. PDF. Save. ... Abstract The effect of sinter size after reduction degradation on the reducibility was estimated with the newly designed experimental method simulating the actual blast …
The reduction degradation characteristics of typical sinter, pellet and lump ore were tested with the reducing gas conditions simulating two kinds of iron-making processes. The results show that, in the same condition of gas composition and temperature, the reduction degradation degree (RDI<3.15mm of sinter is high, …
