Magnetic separation of roasted hematitic ore

Pedro Henrique Neuppmann; José Aurélio Medeiros da Luz

doi:10.15628/holos.2022.10055

Autores/as

Pedro Henrique Neuppmann Universidade Federal de Ouro Preto http://orcid.org/0000-0003-0764-3626
José Aurélio Medeiros da Luz Universidade Federal de Ouro Preto https://orcid.org/0000-0002-7952-2439

DOI:

https://doi.org/10.15628/holos.2022.10055

Palabras clave:

Hematita, ustulação magnetizante, separação magnética

Resumen

Roasting of hematitic ore has been tested in boosting of magnetic concentration of hematitic iron ore. Coke rate, roasting time, and temperature were analyzed at several levels based on literature. Sample characterization was done to evaluate the density of sample and the size particle of ore and coke. Thermogravimetric analysis has indicated hematite to magnetite transformation by characteristic peaks of mass loss. The hematite-magnetite transformation imparts strong contrast in magnetic susceptibility between iron-bearing minerals and gangue, composed basically of quartz. The results have confirmed the reinforcement of magnetism due to roasting process and photographs proved the magnetic character of roasted sample. The best condition obtained was 35 minutes, 10 % of coke (in mass), and 1,023 K (750 oC). The yield was increased by 5.3 % under 0.93 T and by 240.3 % under 0.06 T, increasing selectivity of magnetic separation even under low magnetic gradient. This route could be successfully applied to tailings at low gradient field, recommending the application of this technique for iron ore processing, naturally after careful economic analysis, in which the quantification of environmental liabilities (primarily resulting from its non-implementation) is included.

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Biografía del autor/a

Pedro Henrique Neuppmann, Universidade Federal de Ouro Preto

Engenheiro de Minas pela Universidade Federal de Ouro Preto e mestre em Engenharia Mineral, com ênfase em Tratamento de Minérios, pela mesma universidade,. Técnico em Mineração pelo CEFET — Araxá.

José Aurélio Medeiros da Luz, Universidade Federal de Ouro Preto

Professor da Escola de Minas da Universidade Federal de Ouro Preto. Tem experiência na área de engenharia de minas, com ênfase em métodos físicos e físico-químicos de concentração de minérios e reaproveitamento de resíduos, atuando principalmente nos seguintes temas: fenômenos interfaciais, modelagem matemática, desenvolvimento de processos em tecnologia mineral, projeto e dimensionamento de circuitos, dinâmica de meios granulares e desenvolvimento de processos químicos de base mineral. Tem desenvolvido processos inovadores englobando, por exemplo: processo de diminuição de zinco de resíduos siderúrgicos; um processo de sinterização autocatalítica bioativada, uma formulação de novo agente expansivo para desmonte ou demolição e um novo processo de catálise heterogênea de biodiesel a partir de insumos de base mineral. De junho de 2016 a junho de 2018 exerceu a chefia do Departamento de Engenharia de Minas da UFOP. De julho de 2018 a julho de 2020 atuou como coordenador do Programa de Pós-Graduação em Engenharia Mineral (PPGEM).

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