Avaliação da abordagem heurÃstica para liberação mineral em itabiritos
Evaluation of the mineral liberation heuristics approach for itabirites
Rodrigo Fina Ferreira; Rosa Malena Fernandes Lima
Resumo
Caracterizar a liberação mineral é um dos papéis fundamentais da mineralogia aplicada ao tratamento de minérios, e muito esforço tem sido aplicado ao longo do tempo no desenvolvimento de ferramentas para este fim, tanto no âmbito de técnicas de medição quanto em modelagem. Diversos autores reportaram um padrão nas caracterÃsticas de liberação para diferentes tipos de minério, constatando empiricamente que o grau de liberação do mineral de interesse em uma determinada faixa de tamanho é o mesmo independentemente do grau de cominuição. Caso esta abordagem heurÃstica seja válida, tem-se uma ferramenta útil em estudos de caracterização, porém, não existem evidências de que este padrão seja universal. O presente estudo teve por objetivo avaliar a aplicabilidade da abordagem heurÃstica para liberação mineral em itabiritos do Quadrilátero FerrÃfero. Os resultados demostraram que o grau de liberação do quartzo em uma determinada fração granulométrica apresenta certo nÃvel de variação entre produtos de diferentes graus de cominuição, mas esta diferença tende a reduzir nas faixas mais finas. Conclui-se que a abordagem heurÃstica pode ser uma ferramenta útil para avaliar tendências relacionadas a liberação, mas alguns cuidados devem ser tomados. A aplicabilidade da heurÃstica depende do objetivo e da precisão desejada na caracterização.
Palavras-chave
Abstract
Mineral liberation characterization is a fundamental role of applied mineralogy in mineral processing. Over time, considerable effort has been devoted to developing tools for this purpose, both in terms of measurement techniques and modelling. Several authors have reported a pattern in liberation characteristics for different types of ore, empirically finding that the degree of liberation of the target mineral in a given size fraction is the same regardless of the degree of comminution. If this heuristic approach is valid, it becomes a useful tool in characterization studies. However, there is no evidence that this pattern is universal. This study aimed to evaluate the applicability of the heuristic approach for mineral liberation in Quadrilátero FerrÃfero itabirites. The results showed that quartz degree of liberation in a given size fraction exhibits some variation between products of different degrees of comminution, but this difference tends to decrease in finer size fractions. It is concluded that the heuristic approach can be a useful tool for evaluating liberation trends, but some precautions should be taken. The applicability of the heuristic depends on the objective and the desired accuracy in the characterization.
Keywords
Referências
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Submetido em:
31/01/2024
Aceito em:
01/07/2024
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