Iron ore pellet drying assisted by microwave: A kinetic evaluation

Athayde, Maycon; Fonseca, Maurício Cota; Covcevich, Bagatini Maurício

doi:10.1080/08827508.2017.1423295

Cited by 23 publications

(3 citation statements)

References 16 publications

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“…Although drying processes represent a considerable challenge for the mining industry, the existing work concerning drying of mineral products is scarce [19,20]. Considering drying of iron ore, literature focuses on pellets [21][22][23][24][25], while work regarding iron ore fines is rare. In view of drying of iron ore fines, Namkung and Cho [26] determined some fluid dynamic aspects of a pneumatic dryer operating with iron ore particles with diameters that ranged from 0.5 to 2.0 mm.…”

Section: Introductionmentioning

confidence: 99%

Energy analysis of the convective drying of iron ore fines

Souza

Sarkis

et al. 2023

CI&CEQ

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Drying operations in iron ore processing plants have a particularly high energy demand due to the massive solid flow rates employed in this industry. A 33 full-factorial design was applied to investigate the effects of air temperature, airflow velocity, and solids load on the drying time and the specific energy consumption (SEC) of the convective drying of iron ore fines in a fixed bed. The results demonstrated that each drying air condition was associated with an optimal solids load that minimized the SEC. A load of 73 g (bed height of about 0.8 cm) was identified and validated as the optimal condition in terms of energy consumption for the configuration with the highest air temperature (90?C) and airflow velocity (4.5 m/s). This condition resulted in a drying time of 29.0 s and a corresponding SEC of 12.8 MJ/kg to reduce the solids moisture content from 0.11 to a target of 0.05 kg water/kg dry solids. The approach presented here for identifying the optimum values for the process variables should assist in the design and operation of energy efficient convective dryers for iron ore fines.

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Section: Introductionmentioning

confidence: 99%

Energy analysis of the convective drying of iron ore fines

Souza

Sarkis

et al. 2023

CI&CEQ

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“…By different mechanisms, iron ore and moisture are the materials that control the heating by the microwave 12,19 . In the case of iron ore pellets, Athayde et al (2018) 13 explained that moisture plays an important role as an better absorber of microwave and convert the energy into heat. Despite of other carbon based materials, coal is a poor absorber.…”

Section: Introductionmentioning

confidence: 99%

Novel Drying Process Assisted by Microwave to Iron Ore Pelletizing

Athayde

Bagatini

Fonseca³

2018

Mat. Res.

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Drying has became critical to iron ore pellet production, due to increasing inability to withdrawal moisture from the green pellets, especially faced by goethitic iron ore producers. Most of the existing pelletizing furnaces do not support increase heating rates nor changes in furnaces length, without compromise pellet quality. The present study evaluates an innovative alternative for the actual fully convective drying process composed by an up-draught drying (UDD) and down-draught drying stage (DDD), through the application of microwave energy to assist the existing process. In the present work, the process was simulated in a pot grate where industrial parameters can be simulated. The microwave generator (power input of 10 MW and 915 MHz) was connected in a traditional static pot grate at the hood by a microwave conductor. The experiments show elimination of the over-wet zone at the upper layer of pellet observed at the traditional process. A reduction greater than 7% of the moisture in UDD was achieved, while the convective process adds extra moist to the green pellets modifying the pellet shape.

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“…This may be due to the fact that carbon is a strong absorbing material in the experiment. Under microwave heating, it can be heated to above 1000 °C in 1 minute [14]. In the reduction roasting experiment, the carbon powder strongly absorbed the microwave energy.…”

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confidence: 99%

Kinetic Study on Microwave Magnetizing Roast of Fe<sub>2</sub>O<sub>3</sub> Powders

Wang

Kong

Guo

et al. 2020

SSP

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In this paper, the reaction kinetic mechanism of Fe2O3 powder containing carbon was studied by microwave magnetizing roast. Based on the temperature-rise curve and weight loss curve of Fe2O3 powder by microwave magnetizing roast, the kinetic parameters of Fe2O3 powder microwave magnetizing roast were calculated by non-isothermal methods. The controlling steps of different temperature-rising periods in microwave magnetizing roast process of Fe2O3 powder were calculated by the Achar-Brindley-Sharp-Wendworth method. The results indicated that the controlling step of microwave magnetizing roast was phase boundary reaction control of contracted cylinder in 250~450°C, and it was three-dimensional diffusion control of spherical symmetry in 450~650°C. The results showed that the starting temperature of reduction roasting of Fe2O3 powder was 250°C, which was lower than that under electrical heating, thereby, it proved in theory that microwave heating can enhance reaction rate.

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Iron ore pellet drying assisted by microwave: A kinetic evaluation

Cited by 23 publications

References 16 publications

Energy analysis of the convective drying of iron ore fines

Energy analysis of the convective drying of iron ore fines

Novel Drying Process Assisted by Microwave to Iron Ore Pelletizing

Kinetic Study on Microwave Magnetizing Roast of Fe<sub>2</sub>O<sub>3</sub> Powders

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