ENERGY ANALYSIS OF THE CONVECTIVE DRYING OF IRON ORE FINES

Original scientific paper

Authors

  • Amarílis Severino Souza Federal University of São Carlos, Department of Chemical Engineering, Drying Center of Pastes, Suspensions and Seeds, São Carlos, SP, Brazil
  • Thiago César de Souza Pinto Mineral Development Center – CDM/Vale, BR381 KM450, 33040-900, Santa Luzia, MG, Brazil
  • Alfredo Moisés Sarkis Instituto Tecnológico Vale – ITV, Santa Luzia, MG, Brazil
  • Thiago Faggion de Pádua Federal University of São Carlos, Department of Chemical Engineering, Drying Center of Pastes, Suspensions and Seeds, São Carlos, SP, Brazil https://orcid.org/0000-0003-0694-6991
  • Rodrigo Béttega Federal University of São Carlos, Department of Chemical Engineering, Drying Center of Pastes, Suspensions and Seeds, São Carlos, SP, Brazil

DOI:

https://doi.org/10.2298/CICEQ220208026S

Keywords:

energy consumption, drying efficiency, pellet feed, iron ore agglomerates, transportable moisture limit

Abstract

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 moisture from 0.11 kg water/kg dry solids to a target of          0.05 kg water/kg dry solids. Identifying the optimum values for the process variables should assist in designing and operating energy-efficient convective dryers for iron ore fines.

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Published

19.10.2022 — Updated on 09.04.2023

Issue

Vol. 29 No. 3 (2023)

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Copyright (c) 2021 Amarílis Severino Souza , Thiago César de Souza Pinto, Alfredo Moisés Sarkis , Thiago Faggion de Pádua, Rodrigo Béttega

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How to Cite

ENERGY ANALYSIS OF THE CONVECTIVE DRYING OF IRON ORE FINES: Original scientific paper. (2023). Chemical Industry & Chemical Engineering Quarterly, 29(3), 189-200. https://doi.org/10.2298/CICEQ220208026S

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