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Use of Seawater/Brine and Caliche’s Salts as Clean and Environmentally Friendly Sources of Chloride and Nitrate Ions for Chalcopyrite Concentrate Leaching
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Antofagasta, Chile..
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Antofagasta, Chile..
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Antofagasta, Chile..
Faculty of Engineering and Architecture, Universidad Arturo Prat, Antofagasta, Chile. Departamento de Ingeniería en Metalurgia y Minas, Universidad Católica del Norte, Av. Angamos 0610, Antofagasta, Chile..
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2020 (English)In: Minerals, E-ISSN 2075-163X, Vol. 10, no 5, article id 477Article in journal (Refereed) Published
Abstract [en]

A less harmful approach for the environment regarding chalcopyrite concentrate leaching,using seawater/brine and caliche’s salts as a source of chloride and nitrate ions, was investigated.Dierent variables were evaluated: sulfuric acid concentration, sodium nitrate concentration, chlorideconcentration, source of water (distilled water, seawater, and brine), temperature, concentrate sampletype, nitrate source (analytical grade and industrial salt), and pre-treatment methods in order toobtain maximum copper extraction. All tests were performed at moderate temperatures (45 C)and atmospheric pressure. The leaching system using distilled water, seawater, and brine basemedia resulted in copper extraction of 70.9%, 90.6%, and 86.6% respectively. The leaching media,with a concentration of 20 g/L Cl􀀀, obtained a maximum Cu extraction of 93.5%. An increase in theconcentration of H2SO4 and NaNO3 from 0.5 to 0.7 M, led to an increase in the copper extraction.The use of an industrial salt compared to the analytical salt did not show great variations in thepercentage of extraction achieved, which would be a good and cost eective alternative. The increasein temperature from 25 to 45 C showed a great eect on the copper leaching (of 60% until 90.6%,respectively). The pre-treatment is suggested to increase copper extraction from 60.0% to 71.4%.

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 10, no 5, article id 477
Keywords [en]
chalcopyrite leaching, seawater, industrial brine, caliche’s salts, chloride, nitrate
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-78974DOI: 10.3390/min10050477ISI: 000548343700092Scopus ID: 2-s2.0-85085531342OAI: oai:DiVA.org:ltu-78974DiVA, id: diva2:1431798
Note

Validerad;2020;Nivå 2;2020-06-03 (alebob)

Available from: 2020-05-25 Created: 2020-05-25 Last updated: 2024-01-17Bibliographically approved

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Ghorbani, Yousef

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