Reduction process of low-grade nickel laterite agglomerates using different carbonaceous materials

Keywords: Chemical properties, Chemical process, Nickel minerals, Organic compounds, Reducing gas


Lateritic nickel ores need to be reduced to obtain direct reduced iron and nickel alloy. During processing of lateritic nickel ores in rotary kilns, there is a great loss of fines of ores due to degradation during transport into the reactor. These fines contain substantial amounts of nickel and iron, which could be recovered if they are agglomerated and fed back to the process. It is important to note that the processing of minerals with smaller particle sizes yields more efficient reduction processes because there is more surface area for the reducing agent to react with the mineral particles. This work involves the agglomeration of lateritic ore with a nickel content of 1.78%. Briquettes of 10 g were manufactured with the addition of various carbonaceous materials, such as coal, molasses, and coke, with a ratio of carbon/oxygen = 1. These samples were subjected to temperatures of 1100 °C to reduce the iron and nickel oxides present. The reduction percentages were obtained and the products were analyzed by X-ray diffraction (XRD), atomic absorption, thermogravimetry, and scanning electron microscopy to observe the effectiveness of the reducing agent. The highest reduction percentages (95%) were obtained when molasses was used as the reducing agent.

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Author Biographies

Sandra Consuelo Díaz-Bello, Saint Thomas University

Faculty of Civil Engineering.

Oscar Jaime Restrepo-Baena, National University of Colombia

Faculty of Mines.

Álvaro Hernando Forero-Pinilla, Pedagogical and Technological University of Colombia

School of Metallurgy.


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How to Cite
Díaz-Bello S. C., Restrepo-Baena O. J., & Forero-Pinilla Álvaro H. (2018). Reduction process of low-grade nickel laterite agglomerates using different carbonaceous materials. Revista Facultad De Ingeniería Universidad De Antioquia, (88), 67-74.