Examinando por Autor "Reyes-Bozo, L."

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    Greening chilean copper mining operations through industrial ecology strategies
    (Journal of Cleaner Production, 2014) Reyes-Bozo, Lorenzoa; Reyes-Bozo, L.; Godoy-Faúndez, Alexb; Herrera-Urbina, Ronaldoc; Higueras, Pablod; Salazar, José Luise; Valdés-González, Héctore; Vyhmeister, Eduardof; Antizar-Ladislao, Blanca
    Sawdust was used as cheap sorbent for the remediation of a diesel and oil fuel-contaminated mining soil whereas biosolids were evaluated as collectors and frothers in froth flotation of copper sulphide ores. The use of these waste materials in copper sulphide ore mining and mineral processing may have a positive impact on the cleaner production of copper from its natural raw sources and may decrease the deleterious effect that mining operations have on the environment. Mixtures of oil fuel contaminated mining soil and sawdust were treated in an aerobic reactor at 50.0% humidity for several days. A significant decrease (over 60.0%) of Volatile Organic Compounds (VOCs) content in these mixtures was obtained after one-month of treatment. Rougher flotation of copper sulphide ores using biosolids-from wastewater treatment plants-and humic acids-A component of biosolids-as collector and frother yielded a copper sulphide concentrate with a copper grade and copper recovery of 0.8% and 26.0%, and 3.5% and 29.7%, respectively. Biosolids and humic acids have shown to be potential candidates to partially substitute traditional organic chemicals used in industrial flotation of copper sulphide ores. This possibility opens up an alternative for greening copper sulphide ore flotation by using more environmentfriendly flotation reagents. Based on these results, a conceptual model based on industrial ecology and cleaner production principles is proposed for greening the overall copper sulphide ore processing. © 2014 Elsevier Ltd. All rights reserved.
  • Miniatura
    Ítem
    Soil pollution related to mercury-mining activities in the proximity of Usagre (Badajoz, SW Spain)
    (Taylor and Francis Ltd., 2014) Higueras, P.; Lorenzo, S.; Esbrí, J.M.; García-Noguero, E.M.; Reyes-Bozo, L.
    Usagre (Badajoz, SW Spain) mercury mine was active for an undetermined time until its closure in 1971. The ore exploited in this mine was cinnabar (red HgS), and metallurgy was also performed locally by means of primitive furnaces of the Bustamante type. Since the closure of the mine, reclamation measures have not been carried out at the site, and actual passives include a mine shaft, an accessible descending gallery and a mine dump adjacent to the descending gallery. In the work described here, data from two soil geochemistry surveys were combined and analysed. The surveys were separated by a period of 32 years. Measurements of total gaseous mercury (TGM) in the underground mine and its surroundings were also considered. The soil geochemistry included mercury, lead, zinc and copper. The results indicate that soil pollution is mostly related to the trace mineralisations on the surface and they can therefore be interpreted as natural geochemical anomalies. TGM concentrations are extremely high inside the mine but are of very low concern outside the mine. © 2014, © 2014 Taylor & Francis.