Rendering wastes obtained from gold analysis by the lead-fusion fire-assay method non-hazardous

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:110

Article

Magalhaes, Fernanda Batalha²  Carvalho, Cornelio de Freitas¹  Correa Netto Carvalho, Eduardo Lyse¹  Yoshida, Maria Irene³  Gouvea dos-Santos, Claudio¹ 

[1] Univ Fed Ouro Preto, Dept Chem, BR-35400000 Ouro Preto, MG, Brazil

[2] SGS GEOSOL Labs Ltd, BR-33200000 Vespasiano, MG, Brazil

[3] Univ Fed Minas Gerais, Dept Chem, BR-30123970 Belo Horizonte, MG, Brazil

关键词: Lead;    Crucible waste;    Leaching;    Chemical precipitation;   

DOI  :  10.1016/j.jenvman.2012.06.028

来源: Elsevier

【 摘 要 】

The classical method of melting lead by fire-assay (Pb-FA) is the most frequently used analytical technique in gold prospection. The crucible solid waste which is generated in this process is usually characterized by chemical and mineralogical composition, granulometric size distribution, and classified according to Brazilian Environmental Regulations. This study demonstrates how acid leaching can be used to remove lead from waste originally classified as hazardous by treatment with hydrochloric and nitric acids followed by chemical precipitation in sodium metasilicate solution. It is shown that for every 1000 kg of hazardous waste, 995.6 kg of non-harzardous waste can be recovered. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

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