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MINIMIZAÇÃO DA ATIVIDADE PREG-ROBBING DE MINÉRIOS AURÍFEROS CARBONOSOS COM A UTILIZAÇÃO DE ADITIVOS QUÍMICOS

Authors: Rodrigo César Carvalho Santiago; Ana Claudia Queiroz Ladeira;

MINIMIZAÇÃO DA ATIVIDADE PREG-ROBBING DE MINÉRIOS AURÍFEROS CARBONOSOS COM A UTILIZAÇÃO DE ADITIVOS QUÍMICOS

Abstract

O presente trabalho busca simular a atividade preg-robbing da matriz carbonosa de minérios auríferos a partir de carvões minerais de diferentes níveis de maturação (antracito, betuminoso e lignito), a fim de avaliar a aplicabilidade e a funcionalidade de oito aditivos químicos em desativar/passivar a matéria carbonosa responsável por adsorver o ouro solubilizado. Ensaios de adsorção mostraram que, diferentemente do carvão antracito, o carvão betuminoso e o lignito não foram capazes de adsorver cianocomplexos de ouro em nenhuma extensão, sendo o carvão antracito, portanto, o selecionado para ensaios de desativação/passivação. Nesses ensaios, alíquotas de carvão antracito foram condicionadas por 120 min. em soluções contendo o aditivo em concentrações que variam de 10 a 500 mg.L-1. Ao término do condicionamento, adicionou-se solução cianetada contendo 100 mgAu.L-1, de forma a obter uma solução final com 10 mgAu.L-1, mantida sob agitação por 24 h com o carvão. Os resultados indicaram que os condicionantes C1, C2, C3, S1 e Qe suprimiram o poder adsorvente do carvão em extensões que variam de 60% para baixas concentrações (10 mg.L-1) a valores superiores a 80% para altas concentrações (500 mg.L-1). Avaliou-se também o efeito da variação do tempo de condicionamento (5, 30 e 120 min.) na supressão do poder adsorvente do carvão. Para os aditivos C3 e Qe o incremento no tempo de condicionamento de 5 para 120 min. foi acompanhado de um aumento na supressão da adsorção de 10% e 20%, respectivamente.

Keywords

condicionamento, A, preg-robbing, ouro, Ouro, General Works, aditivos químicos

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Average
Average
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