Navegando por Autor "Carneiro, Maria Fernanda Coimbra"

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    Lixiviação da calcopirita com cloreto férrico e cloreto de sódio.
    (2005) Carneiro, Maria Fernanda Coimbra; Leão, Versiane Albis
    Esse trabalho visou a estudar o comportamento de dissolução da calcopirita com soluções oxigenadas de cloreto férrico e de sódio, levando-se em conta variáveis de processo, como pH, concentração de íons férrico e concentração de cloreto de sódio, fazendo uma abordagem morfológica dos resíduos de lixiviação, a partir de análises de MEV e de medidas de superfície específica e de porosidade. A dissolução de cobre da calcopirita mostrou- se independente do pH, diretamente proporcional à concentração de cloreto de sódio e inversamente proporcional à concentração de íons férrico. A presença de cloreto de sódio alterou a morfologia da camada do produto de lixiviação da calcopirita, o que contribuiu para o aumento da dissolução de cobre no sistema.
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    The role of sodium chloride on surface properties of chalcopyrite leached with ferric sulphate.
    (2007) Carneiro, Maria Fernanda Coimbra; Leão, Versiane Albis
    Leaching of chalcopyrite in oxidizing conditions usually results in low copper extraction due to mineral passivation. It has been proposed that sodium chloride has a positive effect on chalcopyrite dissolution increasing copper extraction. Aiming to bring further insight into this topic, the present work seeks to evaluate the influence of sodium chloride on the leaching of chalcopyrite focusing on surface area and porosity of the reaction products formed during leaching. A finely ground (d50=5.5 μm) chalcopyrite concentrate assaying 25.2% iron, 30.9% sulphur and 27.5% copper was leached in oxygenated ferric sulphate solutions at atmospheric pressure and 95 °C. It has been observed that although sodium chloride favoured natrojarosite precipitation, which reduced the total iron concentration during leaching, copper extractions as high as 91% were accomplished as compared to 45% copper extraction in the absence of NaCl. It is suggested that sodium chloride reduces chalcopyrite passivation and complexes Cu (I) ions adding a second redox couple to the system. Furthermore, morphologic characterization of the reaction products performed by SEM analyses as well as specific surface area and porosity measurements have confirmed that NaCl increases surface area and porosity of the product layer, which explains the high copper extractions observed in the presence of the salt.