Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/9603
Title: Recovering lead from cupel waste generated in gold analysis by Pb-Fire assay.
Authors: Cerceau, Cristiane Isaac
Carvalho, Cornélio de Freitas
Rabelo, Ana Carolina Silveira
Varejão, Eduardo Vinícius Vieira
Keywords: Cupellation
Leaching
Issue Date: 2016
Citation: CERCEAU, C. I. et al. Recovering lead from cupel waste generated in gold analysis by Pb-Fire assay. Journal of Environmental Management, v. 183, p. 771-776, 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0301479716305904?via%3Dihub>. Acesso em: 15 set. 2017.
Abstract: Because of its precision and accuracy, Pb-Fire assay is the most employed method for gold analysis in geological materials. At the second stage of the method, namely cupellation, lead is oxidized to PbO which is absorbed by the cupel, leading to metallic gold as a tiny bend at the bottom of the recipient. After cupellation, cupel becomes highly contaminated with lead, making its disposal a serious risk of environmental contamination. In the present work, a leaching process for removing lead from cupel waste is proposed, which allowed for removing 96% of PbO by weight. After a precipitation step, 92.0% of lead was recovered from leachates in the form of PbSO4. Lead in the solid wastes left by the extraction was above the limit established by Brazilian legislation and these were classified as non-hazardous. Finally, secondary effluents generated after the precipitation step presented lead content more than twenty times lower than that of leachates from cupel waste. Tons of cupel waste are annually generated from gold analysis by Pb-Fire assay. Thus, the proposed method can contribute to prevent the discharge of high amounts of lead into the environment. Also, recovery of lead can help to partially meet the industrial demand for lead compounds.
URI: http://www.repositorio.ufop.br/handle/123456789/9603
metadata.dc.identifier.doi: https://doi.org/10.1016/j.jenvman.2016.08.052
ISSN: 0301-4797
metadata.dc.rights.license: O periódico Journal of Environmental Management concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 4210801282604.
Appears in Collections:DEQUI - Artigos publicados em periódicos

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