Kinetic behaviour of the roasting/selective reduction process with the use of a mixture of bituminous coal and fuel oil as the additive Technical paper

Main Article Content

Hugo Javier Angulo-Palma
https://orcid.org/0000-0002-5012-0348
Manuel Saldana
https://orcid.org/0000-0001-9265-1529
Ángel Legrá Legrá
Alisa Lamorú Urgellés
https://orcid.org/0009-0002-3621-170X
Carlos Hernández Pedrera
https://orcid.org/0000-0003-2572-0891
Sandra Gallegos
https://orcid.org/0009-0004-3145-1944
Felipe M. Galleguillos Madrid
https://orcid.org/0000-0002-1347-3726
Iván Salazar
https://orcid.org/0000-0001-9747-6221
Norman Toro
https://orcid.org/0000-0003-4273-3563

Abstract

Lateritic ore is currently the main raw material that allows extraction of Ni by the Caron process. To date, the kinetic behaviour of the roasting/selective reduction process of lateritic nickeli¬ferous ores on a pilot scale is largely unknown. In the present study, the kinetic behaviour, the controlling stage and the mechanisms that describe this process with the use of a mixture of 2 wt.% bituminous coal and 1.25 wt.% fuel oil as a reducing additive were determined during the evaluation of the high and low thermal profiles, respectively. The phases of the reduced/leached minerals and the fed ore were analysed by X-ray powder diffraction. It was observed that the mixture used as a reducing additive guarantees an adequate trans¬for¬mation in both thermal profiles; the relationship between the residual Ni and residence time is described by a first-order reaction with the determination coefficients greater than 0.949. Although the influence of post-combustion air is not analysed, the controlling stage was diffusion through the ash layer with an activation energy of 14.4060 kJ mol-1. Thus, the most precise combination to describe the process is diffusion through the ash layer and the growth of the nuclei.

Article Details

Section

Chemical Engineering - General

Author Biographies

Iván Salazar, Departamento de Ingeniería Civil, Universidad Católica del Norte, Antofagasta 1270709, Chile.

Academic in North Catholic University, Antofagasta, Chile.

Norman Toro, Faculty of Engineering and Architecture, Universidad Arturo Prat, Iquique, Chile

Academic in Faculty of Engineering and Architecture, Universidad Arturo Prat,

How to Cite

[1]
H. J. Angulo-Palma, “Kinetic behaviour of the roasting/selective reduction process with the use of a mixture of bituminous coal and fuel oil as the additive: Technical paper”, Hem Ind, May 2025, doi: 10.2298/HEMIND240918005A.

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