Utilize este identificador para referenciar este registo:
https://hdl.handle.net/10216/94687
Autor(es): | M. F. Almeida Maria Manuela Amarante |
Título: | Leaching of a silver bearing sulphide by-product with cyanide, thiourea and chloride solutions |
Data de publicação: | 1995 |
Resumo: | The aim of this research was to increase the value of sulphide tailings assaying 1000-1500 g/ton Ag per tonne and high arsenic (about 13%) content. The sulphides were characterized and it was verified that silver occurs both as mathildite, AgBiS2, and in solid solution in galena. Three alternative routes were assessed: cyanidation, thiourea leaching and chloride leaching. The cyanidation route showed that there was a high consumption of cyanide and led to the formation of an insoluble compound of silver thiocyanate. The leaching with thiourea was achieved without the introduction of Fe 3+ but it is not an economically viable route. Chloride leaching of the product in its original particle grain size showed very good extraction even without addition of Fe 3+. Operating under [Cl-_.3 M at 80-90°C for at least 3 h it was possible to dissolve 60-80% of the total silver, and higher recoveries of lead and bismuth were also achieved. |
Assunto: | Engenharia geológica, Outras ciências da engenharia e tecnologias Geological engineering, Other engineering and technologies |
Áreas do conhecimento: | Ciências da engenharia e tecnologias::Outras ciências da engenharia e tecnologias Engineering and technology::Other engineering and technologies |
URI: | https://hdl.handle.net/10216/94687 |
Tipo de Documento: | Artigo em Revista Científica Internacional |
Condições de Acesso: | restrictedAccess |
Aparece nas coleções: | FEUP - Artigo em Revista Científica Internacional |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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61291.pdf Restricted Access | 139.93 kB | Adobe PDF | Request a copy from the Author(s) |
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