Leaching of a silver bearing sulphide by-product with cyanide, thiourea and chloride solutions

• Tipo: Artigo em Revista Científica Internacional
• Data: 1995

Autores

M. F. Almeida (Autor) FEUP; Maria Manuela Amarante (Autor) FEUP

Revista

Título: Minerals Engineering

Vol. 8 Nº 3

Páginas: 257-271

ISSN: 0892-6875

Editora: Elsevier

Indexação

Scopus

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia geológica

Outras Informações

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15