Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese Nodules
Chalcocite (Cu<sub>2</sub>S) has the fastest kinetics of dissolution of Cu in chlorinated media of all copper sulfide minerals. Chalcocite has been identified as having economic interest due to its abundance, although the water necessary for its dissolution is scarce in many regions. In...
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MDPI AG
2020-10-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/11/1426 |
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| author | David Torres Emilio Trigueros Pedro Robles Williams H. Leiva Ricardo I. Jeldres Pedro G. Toledo Norman Toro |
| author_facet | David Torres Emilio Trigueros Pedro Robles Williams H. Leiva Ricardo I. Jeldres Pedro G. Toledo Norman Toro |
| author_sort | David Torres |
| collection | DOAJ |
| description | Chalcocite (Cu<sub>2</sub>S) has the fastest kinetics of dissolution of Cu in chlorinated media of all copper sulfide minerals. Chalcocite has been identified as having economic interest due to its abundance, although the water necessary for its dissolution is scarce in many regions. In this work, the replacement of fresh water by sea water or by reject brine with high chloride content from desalination plants is analyzed. Additionally, the effect of adding MnO<sub>2</sub> from available manganese nodules in vast quantities at the bottom of the sea is studied. Reject brine shows better results than sea water, and the addition of MnO<sub>2</sub> to the brine significantly increases the kinetics of chalcocite dissolution in a short time. H<sub>2</sub>SO<sub>4</sub> concentration is found to be irrelevant when working at high concentrations of chloride and MnO<sub>2</sub>. The best results, 71% Cu extractions in 48 h, are obtained for reject brine, 100 mg of MnO<sub>2</sub> per 200 g of mineral and H<sub>2</sub>SO<sub>4</sub> 0.5 mol/L. The results are expected to contribute to a sustainable process of dissolution of chalcocite by using the reject brine from desalination plants. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T15:18:41Z |
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| spelling | doaj.art-5bed75a5ecea47488e3cf22bcd1267c32023-11-20T18:39:48ZengMDPI AGMetals2075-47012020-10-011011142610.3390/met10111426Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese NodulesDavid Torres0Emilio Trigueros1Pedro Robles2Williams H. Leiva3Ricardo I. Jeldres4Pedro G. Toledo5Norman Toro6Department of Mining and Civil Engineering, Universidad Politécnica de Cartagena, 30203 Cartagena, SpainDepartment of Mining and Civil Engineering, Universidad Politécnica de Cartagena, 30203 Cartagena, SpainEscuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso 2340000, ChileDepartamento de Ingeniería Química y Procesos de Minerales, Facultad de Ingeniería, Universidad de Antofagasta, Antofagasta 1270300, ChileDepartamento de Ingeniería Química y Procesos de Minerales, Facultad de Ingeniería, Universidad de Antofagasta, Antofagasta 1270300, ChileDepartment of Chemical Engineering and Laboratory of Surface Analysis (ASIF), Universidad de Concepción, P.O. Box 160-C, Correo 3, Concepción 4030000, ChileDepartment of Mining and Civil Engineering, Universidad Politécnica de Cartagena, 30203 Cartagena, SpainChalcocite (Cu<sub>2</sub>S) has the fastest kinetics of dissolution of Cu in chlorinated media of all copper sulfide minerals. Chalcocite has been identified as having economic interest due to its abundance, although the water necessary for its dissolution is scarce in many regions. In this work, the replacement of fresh water by sea water or by reject brine with high chloride content from desalination plants is analyzed. Additionally, the effect of adding MnO<sub>2</sub> from available manganese nodules in vast quantities at the bottom of the sea is studied. Reject brine shows better results than sea water, and the addition of MnO<sub>2</sub> to the brine significantly increases the kinetics of chalcocite dissolution in a short time. H<sub>2</sub>SO<sub>4</sub> concentration is found to be irrelevant when working at high concentrations of chloride and MnO<sub>2</sub>. The best results, 71% Cu extractions in 48 h, are obtained for reject brine, 100 mg of MnO<sub>2</sub> per 200 g of mineral and H<sub>2</sub>SO<sub>4</sub> 0.5 mol/L. The results are expected to contribute to a sustainable process of dissolution of chalcocite by using the reject brine from desalination plants.https://www.mdpi.com/2075-4701/10/11/1426sulfide leachingchalcocite dissolutiondesalinationreject brinereplace watersustainability |
| spellingShingle | David Torres Emilio Trigueros Pedro Robles Williams H. Leiva Ricardo I. Jeldres Pedro G. Toledo Norman Toro Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese Nodules Metals sulfide leaching chalcocite dissolution desalination reject brine replace water sustainability |
| title | Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese Nodules |
| title_full | Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese Nodules |
| title_fullStr | Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese Nodules |
| title_full_unstemmed | Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese Nodules |
| title_short | Leaching of Pure Chalcocite with Reject Brine and MnO<sub>2</sub> from Manganese Nodules |
| title_sort | leaching of pure chalcocite with reject brine and mno sub 2 sub from manganese nodules |
| topic | sulfide leaching chalcocite dissolution desalination reject brine replace water sustainability |
| url | https://www.mdpi.com/2075-4701/10/11/1426 |
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