scholarly journals Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 340
Author(s):  
Xiaoli Yuan ◽  
Fuming Luo ◽  
Shifeng Liu ◽  
Mingyuan Zhang ◽  
Dongshan Zhou
Keyword(s):  
Iron Ore ◽  
Reduction Rate ◽  
Interface Reaction ◽  
Rapid Reduction ◽  
Composite Pellet ◽  
Isothermal Reduction ◽  
Reduction Of Iron ◽  
Composite Pellets ◽  
Apparent Activation Energies ◽  
Kinetics Of

The kinetics of the isothermal reduction of iron ore–coke, iron ore–charcoal, and iron ore–biomass (straw) composite pellets were studied at 900–1200 °C. Compared with the other two composite pellets, the composite pellet using biomass as a reducing agent showed a more rapid reduction rate at a relatively low temperature. With an increase in the temperature, the reduction rates of the three different composite pellets tended to be equal. The reducing reactions of the three different composite pellets were all mainly controlled by gasification diffusion. The reduction rates can be described by the interface reaction kinetic model ([1−(1−m)1/3]2=kt). The apparent activation energies of the gasification diffusion of coke, charcoal, and biomass composite pellets at 900–1200 °C were calculated using the Arrhenius equation, and they were 95.81, 71.67, and 58.69 kJ/mol, respectively. The biomass composite pellets exhibited a lower apparent activation energy than the composite pellets with other reduction agents.

scholarly journals Non-Isothermal Reduction Kinetics of Iron Ore Fines with Carbon-Bearing Materials

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1137
Author(s):  
Abourehab Hammam ◽  
Yi Cao ◽  
Abdel-Hady A. El-Geassy ◽  
Mohamed H. El-Sadek ◽  
Ying Li ◽  
...  
Keyword(s):  
Iron Ore ◽  
Reduction Rate ◽  
Gas Diffusion ◽  
Reduction Kinetics ◽  
Heating Rates ◽  
Model Free ◽  
Isothermal Reduction ◽  
Reduction Of Iron ◽  
Bearing Materials ◽  
Iron Ore Fines

This study investigates the non-isothermal reduction of iron ore fines with two different carbon-bearing materials using the thermogravimetric technique. The iron ore fines/carbon composites were heated from room temperature up to 1100 °C with different heating rates (5, 10, 15, and 20 °C/min) under an argon atmosphere. The effect of heating rates and carbon sources on the reduction rate was intensively investigated. Reflected light and scanning electron microscopes were used to examine the morphological structure of the reduced composite. The results showed that the heating rates affected the reduction extent and the reduction rate. Under the same heating rate, the rates of reduction were relatively higher by using charcoal than coal. The reduction behavior of iron ore-coal was proceeded step wisely as follows: Fe2O3 → Fe3O4 → FeO → Fe. The reduction of iron ore/charcoal was proceeded from Fe2O3 to FeO and finally from FeO to metallic iron. The reduction kinetics was deduced by applying two different methods (model-free and model-fitting). The calculated activation energies of Fe2O3/charcoal and of Fe2O3/coal are 40.50–190.12 kJ/mole and 55.02–220.12 kJ/mole, respectively. These indicated that the reduction is controlled by gas diffusion at the initial stages and by nucleation reaction at the final stages.

scholarly journals Kinetics of Gaseous Reduction of Iron Ore Fines.

1993 ◽  
Vol 33 (11) ◽  
pp. 1168-1173 ◽  
Author(s):  
Sujoy K. Dutta ◽  
Ahindra Ghosh
Keyword(s):  
Iron Ore ◽  
Gaseous Reduction ◽  
Reduction Of Iron ◽  
Iron Ore Fines ◽  
Kinetics Of

The Effects of Reduction Parameter to Composite Pelet of Iron Ore and Coal Using Single Conveyor Belt Hearth Furnace

2016 ◽  
Vol 842 ◽  
pp. 115-119
Author(s):  
Johny Wahyuadi Soedarsono ◽  
Andi Rustandi ◽  
Yudha Pratesa ◽  
Rianti Dewi Sulamet-Ariobimo ◽  
Bagus Hadi Prabowo ◽  
...  
Keyword(s):  
Iron Ore ◽  
Direct Reduction ◽  
Reduction Process ◽  
Conveyor Belt ◽  
Separation Process ◽  
Iron Ores ◽  
Hearth Furnace ◽  
Composite Pellet ◽  
Direct Reduction Iron ◽  
Composite Pellets

Iron ores should be separated from oxygen and impurities which are coming along during the mining process. The separation process is known as reduction. There are two types of reduction process, and the most common is direct reduction process (DRP). There are several parameters in DRP which will determine the quantities of the product known as direct reduction iron (DRI). This worked discussed the effect of reduction temperature and pellet heap to the quantities of DRI using single conveyer belt Hearth furnace. The worked was done in laboratory scale using composite pellets with 14 mm in diameter. The ratio of iron ore to coal in the composite pellet is 1 to 1. The reduction process temperatures are 500oC, 700oC and 900oC. The reduction time is 25 minutes. While the pellets heap are also varied to 1, 3, 5, 7, 8 and 9 layers. The results show that DRI was formed in 700OC and the quantities of DRI are in line with the reduction temperatures and layers of composite pellets heap.

A model for the isothermal reduction of iron ore with coal char

1992 ◽  
Vol 50 (3-4) ◽  
pp. 217-226 ◽  
Author(s):  
A RAY ◽  
K PRASAD ◽  
P SEN
Keyword(s):  
Iron Ore ◽  
Coal Char ◽  
Isothermal Reduction ◽  
Reduction Of Iron

The Reducibility of the Iron Ore Materials as Instrument of the Coke Consumption Decrease in the Blast Furnace Smelting

2013 ◽  
Vol 334-335 ◽  
pp. 375-380 ◽  
Author(s):  
A.N. Dmitriev ◽  
Yu.A. Chesnokov ◽  
Galina Yu. Vitkina
Keyword(s):  
Blast Furnace ◽  
Coke Consumption ◽  
Iron Ore ◽  
Diffusion Processes ◽  
Reduction Kinetics ◽  
Blast Furnace Smelting ◽  
Reduction Of Iron ◽  
Kinetics Of ◽  
And Diffusion ◽  
Furnace Smelting

The technique of defining the minimum coke consumption in blast furnace smelting allows for the calculation of the reserve of coke economy on the basis of thermodynamic principles. In this reserve the constitutive role belongs to the reducibility of the iron ore materials (the agglomerate and pellets). In the present paper, the questions of the reduction kinetics of the iron ore materials and diffusion processes at reduction of iron from its oxides are considered. It is shown that the reducibility of the iron ore materials is the basic reserve of economy the scarce and expensive coke in the blast furnace smelting.

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