Reduction Behaviour of Iron Ore–Coal Composite Pellets in Rotary Hearth Furnace (RHF): Effect of Pellet Shape, Size, and Bed Packing Material

• Iron ore pellets are used for the production of hot metal in blast furnaces and DRI/HBI in direct reduction processes. • A blast furnace is a shaft furnace, which is charged with iron bearing materials (pellets, sinters and/or lump ore), reducing agents (metallurgical coke) and additives (limestone, quartz, BOF slag).

Lumps of iron ore were crushed, ball milled, and stored as − 250 μm powder. Iron ore powder was mixed with water to make − 19 + 9 mm diameter pellets according to IS-11092:2001 [24] weighing 6–7 g. Green pellets were air dried for 24 h and then oven dried for 24 h. Oven dried pellets were hardened at 1100 °C for …

the iron ore whiskers to grow sufficiently during reduction, as a result lower swelling is obtained [18]. Sequence of constituents, decreasing the swelling indices of fired iron ore pellets is MgO, followed by silica, lime and alumina. Firing parameters With increase in firing temperature the swelling index of iron ore pellets decreases [19-20].

Reduction of iron ore–coal composite pellets in multi-layers at rotary hearth furnace (RHF) is limited by heat and mass transfer. Effect of various parameters like pellet shape, size, and bed packing material that are supposed to influence the heat and mass transfer in the pellet bed, have been investigated, on the reduction behaviour of iron …

Iron ore reduction by the gaseous products of methane partial oxidation in a porous media was studied numerically and experimentally by Pablo [9]. Direct reduction of iron ore pellets with and without biomass was studied using hydrogen as the reducing agent by Guo [10]. However, the research on reduction behavior of metallurgical waste …

48 rowsIt is found that lump ore has lowest reduction rate in all test conditions, and at lower temperatures iron ore pellets reduce faster than sinter, and this …

3.3. Reduction kinetics and models. Porous material reaction was used to describe the composite pellet reduction process. The main process included: external gas diffused into composite pellets through the gas phase boundary layer; the diffusion of the gas within the pellets; the gasification reaction of carbon; the interface reduction …

Reduction Behavior of Iron Ore Pellets with Simulated Coke Oven Gas and Natural Gas. steel research international . 10.1002/srin.201200333 . 2013 . Vol 84 (11) . pp. 1085-1097 . Cited By ~ 25. Author (s):

However, these models were established in a single reducing atmosphere of H 2 [14,15] or CO [16,17], and few studies have been conducted on the flash reduction behavior in a mixed atmosphere, where the flash reduction process of iron ore is presumably much more complicated than in a single reducing gas due to homogeneous …

The reduction kinetics of iron ore–coal composite pellet have commonly been represented as integrated rate of reduction (IRoR), which represents the overall rate of reduction of the whole specimen [].The IRoR does not provide any information about the difference between the reduction rates prevailing at different points in the specimen, …

The present project work on "Reduction and Swelling Behaviour of Fired Iron Ore Pellets" was undertaken with a view to promote the effective utilization of iron ore and coal fines in sponge iron making. Presently, India has become the world leader in sponge iron production and the production of steel by DR-EAF route is increasing day by …

An experimental study was conducted to determine the reduction behaviour of olivine iron ore pellets and associated reduction mechanisms in the experimental blast furnace (EBF) located at Luleå ...

With the aim of reducing CO 2 emissions in basic industries, the sector of iron and steel metallurgy is also faced with the question of how carbon can be replaced in ore reduction. By means of in-situ observation, this study investigates the direct reduction (DR) of individual iron ore pellets under an atmosphere of hydrogen (H 2) and carbon …

Studies on the reduction and swelling behaviors of fired pellets, made by mixing hematite iron ore fines of −100, −18 + 25, and −10 + 16 mesh sizes in different proportions, were carried out ...

REDUCTION BEHAVIOUR OF IRON ORE PELLETS - …ethesis.nitrkl.ac.in/238/1/rashmi_report.pdf ·...

Biomass can increase the reduction velocity index (RVI) of pellets by 1.12%/min. Abstract Keywords Introduction Direct reduction technology of iron ore is …

There have been studies about the low-temperature reduction degradation characteristics of pellets, sinter, and lump ore, [] as well as the softening, shrinking, and melting reduction behavior of all charge materials or just part of them. [3-9]Even though some research has considered all iron-bearing materials (sinter, iron ore pellets, and …

The extent of reduction of pellet with 60% iron ore was almost equal to that of pellet with 50% iron ore, but the reduction mass amount of pellet with 60% iron ore was higher. It can be derived that when Ω increased from 3.22 (for 60% iron ore pellet) to 4.83 (for 50% iron ore content), the biochar in pellets would be in excess to promote the ...

The reduction behaviour of high flux (basicity 2, 4, 6 & 8) hardened iron ore pellets, reduced at temperature (900–1050 °C) were examined and reported here. …

reduction behaviour of acidic and basic fluxed iron ore pel-lets. The reduction was carried out isothermally at 1023– 1273K with reformed natural gas mixture. The influences of load values, temperature and basicity were investigated and correlated. In previous publication,18) the reduction ki-netics and mechanism under load was discussed. 2.

Softening and melting behaviour of the iron ore materials was studied towards understanding the mechanism of formation of liquid slag and metal phases in the pre-reduced sinter and pellets. Wide ...

Composite pellets containing PET wastes, coke, and magnetite iron ore were reduced at selected temperatures of 1400 and 1450°C for reduction time from 2 to 10 min to investigate the reduction ...

Request PDF | Reduction behaviour of iron ore pellets using hardwood biomasses as a reductant for sustainable ironmaking | Renewable biomass is a potent, CO2 neutral substitute to fossil coal and ...

The reduction results clearly show that the reducibility of the pellets depends on the initial mineralogy of the ore. It was also observed that the reducibility decreased as gangue content (Al 2 O ...

Studies on the reduction and swelling behaviors of fired pellets, made by mixing hematite iron ore fines of −100, −18 + 25, and −10 + 16 mesh sizes in different proportions, were carried out ...

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 …

The effect of different reduction parameters such as temperature (850-1000ºC), time (15-120 minutes.), mixing of particles of different sizes at different ratios for pellet preparation etc. on the reduction behavior of iron ore pellets. These form the subject matter of …

Direct reduction of iron ore pellets (DRI) with and without biomass was studied using hydrogen as the reducing agent. ... Reduction behavior of pellets. The roasted pellets were isothermally reduced in the range of temperature from 1123 K to 1323 K with pure hydrogen and the results are shown in Fig. 2. Download : Download full-size …

The blast furnace simulator (BFS) presented in Figure 4 is a tube furnace first introduced by Iljana et al. [21] in a study on the reduction and swelling of iron ore pellets. The reduction tube is ...