Estudio de la electrodisolución de concentrados de flotación: galena y concentrado complejo de cinc
Historically, metal recovery has been carried out through the exploitation of mines, where metals are generally in the form of metal sulphides. In these mines, predominant mineral ore are associated with low associations of other minerals. However, in general these high grade ores have been exhauste...
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| Tipo de documento: | tese |
| Estado: | Versão publicada |
| Data de publicação: | 2004 |
| País: | México |
| Recursos: | Universidad Autónoma Metropolitana |
| Repositório: | Repositorio Institucional de la UAM Iztapalapa |
| Idioma: | espanhol |
| OAI Identifier: | oai:bindani.izt.uam.mx:xp68kg880 |
| Acesso em linha: | https://doi.org/10.24275/uami.xp68kg880 |
| Access Level: | Acceso aberto |
| Palavra-chave: | info:eu-repo/classification/LEM/Preparación mecánica de minerales info:eu-repo/classification/LEM/Pyrometallurgy info:eu-repo/classification/LEM/Pirometalurgia info:eu-repo/classification/LEM/Ore-dressing info:eu-repo/classification/cti/7 |
| Resumo: | Historically, metal recovery has been carried out through the exploitation of mines, where metals are generally in the form of metal sulphides. In these mines, predominant mineral ore are associated with low associations of other minerals. However, in general these high grade ores have been exhausted and up to now many complex ores where the mineral phases are in similar concentration have not been exploited. The pyrometallurgical processing of concentrates represents a potentially major pollution problem and for complexes minerals, the efficiency is not satisfactory. Due to the above, the hydrometallurgical processes have received special attention because they are more environmentally friendly and can be employed as an alternative in the processing of complex minerals and complex concentrates. However, some problems have lead to poor efficiencies in mineral processing. Hence, it is necessary to develop fundamental studies in order to explain and overcome these limitations. Due to the fact that Mexico is a strong lead and zinc producer as many other metals, in this research two flotation products, a galena and a complex zinc concentrate were studied. The second one concentrate was chosen because in Mexico there are mines of this type that have not been exploited. In this work a fundamental study of the electrodissolution of a galena concentrate was undertaken. The mechanism found showed that an electrochemical strategy is required to avoid passivation produced by the sulphur species during the earlier electrooxidation stages. This strategy permitted a progressive electrodissolution of this concentrate. On the other hand, the oxidation mechanism of a zinc complex concentrate, with associations of other minerals (63.4% ZnS, 20.1% FeS2, 5% CuFeS2, 0.33% PbS, 0.45% Cu12Sb4S13 y 0.4% FeAsS) was studied. An electrochemical strategy was proposed to electrodissolve the different mineral species as a function of the anodic potential. Moreover, these results showed that the progressive anodic dissolution of each mineral in the zinc complex concentrate is possible. These findings may constitute a hydrometallurgical alternative for the leaching of complex zinc concentrates. |
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