Evaluation of a mixed collector made of dodecylamine and fatty acids in the direct flotation of iron ore tailings
Avaliação de um coletor misto constituído por dodecilamina e ácidos graxos na flotação direta de rejeitos de minério de ferro
Leonardo Junior Fernandes Campos; Itamar Daniel Delbem; Roberto Galery
Abstract
Mining tailings have become a major problem for society, especially after the tailings dam collapses in the cities of Mariana - MG and Brumadinho - MG, in Brazil. This study aims to investigate the possibility of using a mixed collector composed of dodecylamine (DDA) and a fatty acid (GA) reagent in the direct flotation of iron ore tailings. The sample used in this study (10.8% Fe) consists of quartz and hematite, the particles of which are released. The direct flotation tests revealed that the mixed collector at a molar ratio of DDA:AG of 1:7.0 produced better results than AG alone. Increasing the dosage of the mixed collector DDA:AG 1:7.0 did not produce satisfactory results in terms of Fe content and recovery. However, the tests carried out on the -150 µm iron ore tailings sample using the DDA:AG 1:7.0 mixed collector produced a final concentrate with 64.04% Fe. These results can be explained by the greater collection efficiency and selectivity promoted by the mixed collector, due to the greater degree of compaction of the monolayer formed by the reagent, which results from the lower electrostatic repulsion between ions of the same species.
Keywords
Resumo
Os rejeitos de mineração têm se tornado um grande problema para a sociedade, principalmente após os rompimentos das barragens de rejeitos nas cidades de Mariana - MG e Brumadinho – MG, no Brasil. Este estudo tem como objetivo investigar a possibilidade de utilização de um coletor misto composto por dodecilamina (DDA) e um reagente de ácido graxo (AG) na flotação direta de rejeitos de minério de ferro. A amostra utilizada neste estudo (10,8% Fe) é constituída por quartzo e hematita, cujas partículas são libertadas. Os testes de flotação direta revelaram que o coletor misto numa razão molar de DDA:AG de 1:7,0 produziu melhores resultados do que o AG sozinho. O aumento da dosagem do coletor misto DDA:AG 1:7,0 não produziu resultados satisfatórios em termos de teor de Fe e recuperação. No entanto, os ensaios realizados com a amostra de rejeitos de minério de ferro na granulometria -150 µm utilizando o coletor misto DDA:AG 1:7,0 apresentaram um concentrado final com 64,04% Fe. Esses resultados podem ser explicados pela maior eficiência de coleta e seletividade promovida pelo coletor misto, devido ao maior grau de compactação da monocamada formada pelo reagente, que decorre da menor repulsão eletrostática entre íons da mesma espécie.
Palavras-chave
Referências
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Submetido em:
28/12/2023
Aceito em:
24/05/2024
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