SEPARAÇÃO SELETIVA DE COBRE DO LIXIVIADO DE NÍQUEL LATERÍTICO POR PRECIPITAÇÃO UTILIZANDO DITIONITO DE SÓDIO
SELECTIVE SEPARATION OF COPPER FROM NICKEL LATERITE LEACH BY PRECIPITATION USING SODIUM DITHIONITE
Iara Alves Anes, Amilton Barbosa Botelho Junior, Denise Crocce Romano Espinosa, Jorge Alberto Soares Tenório
Resumo
Após a lixiviação do minério laterítico de níquel, a solução obtida contém metais com valor econômico agregado. Dentre estes metais, destacam-se o cobre, níquel e cobalto. Técnicas de separação vem sendo estudadas e aplicação para a separação seletiva destes metais. O uso da técnica de troca iônica nesta solução não é uma vantagem devido à concentração elevada de ferro (20g.L-1 de Fe e 0,15g.L-1 de Cu). A precipitação por hidróxidos não é vantajosa pelo mesmo motivo, pois a precipitação de ferro causa a co-precipitação de cobre e cobalto. Estudos mostram que o uso de precipitação por redução química é viável tecnicamente. O presente trabalho tem por objetivo o estudo da precipitação do cobre por ditionito de sódio. Uma solução sintética foi preparada e o efeito do tempo (30min-120min) e a velocidade de agitação (0 – 200rpm) foram estudadas. Experimentos foram realizados em pH 0,50 e 25o C. Resultados mostraram que a precipitação do cobre aumenta com a diminuição da velocidade de agitação. A porcentagem de cobre removida da solução foi de 97% a 45rpm em 45min.
Palavras-chave
Abstract
stract After leaching of nickel laterite ore, the solution obtained has metals with economic value. Among these metals are copper, nickel and cobalt. Separation techniques have been studied and applied for selective separation of these metals. The use of ion exchange technique for this solution is not advantageous due to the high iron concentration (20g.L-1 of Fe e 0,15g.L-1 of Cu). The precipitation by hydroxides is also not advantageous for the same reason, because the iron precipitation causes co-precipitation of copper and cobalt. Studies show that the use of precipitation by chemical reducing is technically feasible. The present work has as objective the study of copper precipitation by sodium dithionite. A synthetic solution was prepared and the effect of time (30min-120min) and stirring speed (0-200rpm) were studied. Experiments were performed at pH 0.50 and 25o C. Results showed that the copper precipitation increases when the stirring speed decreased. The percentage of copper removal from solution was 97% at 45rpm and 45min.
Keywords
Referências
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