Classification of rare earths mineral resources using the Jequié/BA complex rock weathering chemical index

Classificação de recursos minerais de terras raras utilizando o índice químico de intemperismo de rochas do complexo Jequié/BA

Autores

Palavras-chave:

Rare earths oxides, Classification of mineral resources, Jequié/BA Complex, Ion adsorption clays

Resumo

The most common economic mineral deposits of Rare Earths are associated to magmatic calc-alkaline to alkaline rocks and their products. This work presents data from drilling carried out in rocks of the Jequié/BA Complex, mineralized in rare earths, which were subjected to an intense weathering process, similar to what occurred in the Ion Adsorption Clays deposits in southern China. The interpretation of the survey data allowed the classification of rare earths mineral resources with similar, sometimes higher, levels than those of Chinese deposits, contained in the lateritic regolithic profile studied. The chemical index of rock alteration (CIA) was adopted as a classification tool, horizontally separating the mineralized weather profile into six zones. The data indicate that there was supergenic enrichment REO in the lower portions of the profile and sometimes in the upper zones. The average levels ranged between 0.09% and 0.22% REO, with maximum values of 1.6%. A model section representing the deposit of rare earths minerals of supergenic origin in rocks of the Jequié/BA Complex was developed.

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Biografia do Autor

André Carlos Silva, Federal University of Catalão

Possui graduação em Engenharia de Minas (2000), mestrado em Engenharia Mineral (2003) e doutorado em Engenharia de Materiais (2010) pela Universidade Federal de Ouro Preto. Pós-doutorado na Universidade Federal de Minas Gerais (2013-2015) e na Technische Universität Clausthal (2017-18). É pesquisador do CNPq nível 2. Atualmente é professor Associado II da UAE de Engenharia da Universidade Federal de Catalão e coordenador do Programa de Pós-Graduação em Ciências Exatas e Tecnológicas (PPGCET), mandado 2020-2024. Possui experiência em Engenharia de Minas e de Materiais, com ênfase em Tratamento de Minérios, atuando nas seguintes áreas: simulação computacional, automação industrial e equipamentos de tratamento de minérios. É editor associado da Revista Tecnologia em Metalurgia, Materiais e Mineração (ABM) na área de Mineração e revisor das revistas: International Journal of Mining, Materials, and Metallurgical Engineering, Mineral Processing and Extractive Metallurgy Review, Minerals, Journal of Materials Research and Technology, Powder Technology, International Journal of Mineral Processing, Journal of Dispersion Science and Technology, Carbohydrate Polymers, Tunnelling and Underground Space Technology, American Association for Science and Technology, Anais da Academia Brasileira de Ciências, Revista Escola de Minas, Holos e Tecnologia em Metalurgia, Materiais e Mineração. 

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Publicado

2024-05-28

Edição

2024: Global Impact

Seção

Articles