Roasting of Sulfide Minerals

doi:10.1002/9781119078326.ch2

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“…However, it is expected that also sulfide phases of Cu, Pb, As, and Co underwent oxidation to sulfate or oxide phases during oxidative roasting. 46 Water leaching can provide indications of the occurrence of such mineral transformations as it is well-known that metal sulfides are insoluble in contrast to most metal sulfates. 19 The roasted materials were leached in water at 25 °C for 30 min and an L/S = 10.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Mineral transformations of minor metals in the material could not be observed by XRD analysis due to their low concentration, apart from Zn for which sphalerite (ZnS) and zinkosite (ZnSO 4 ) phases were detected (Table ). However, it is expected that also sulfide phases of Cu, Pb, As, and Co underwent oxidation to sulfate or oxide phases during oxidative roasting . Water leaching can provide indications of the occurrence of such mineral transformations as it is well-known that metal sulfides are insoluble in contrast to most metal sulfates .…”

Section: Resultsmentioning

confidence: 99%

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Additive-Free Aqueous Extraction of Copper and Zinc from Sulfidic Tailings Using Fast Microwave-Assisted Pre- and Post-Treatments

Kalebić

Dehaen

Spooren

2022

Ind. Eng. Chem. Res.

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Due to an ever-increasing demand for commodity and technology metals, secondary resources can complement the primary resource supply. Sulfidic mining waste from the Neves-Corvo mine (Portugal) is a pyrite-rich tailing that still contains valuable metals (Cu, Zn) and minor amounts of technology metals (Co, Mn) in the form of sulfides. In this work, by fine-tuning a fast microwave (MW)-assisted oxidative roasting process (5 min, 550 °C), the sulfide minerals containing the desired metals converted to water-soluble sulfate phases, whereas pyrite converted to waterinsoluble magnetite and hematite. The desired metals Cu (76%) and Zn (46%), as well as Co (66%) and Mn (53%), could thus be selectively leached over Fe (2.9%) in water (25 °C, 30 min). The obtained leachates were further purified by selectively precipitating Fe (95%) and As (100%) by a MW-assisted hydrothermal treatment (150 °C, 1 h), leaving Cu, Zn, Mn, and Co in solution for further recovery. In the proposed three-step method, no chemicals other than water were used, and the environmental risks of the final residues were significantly decreased, compared to those of the original sulfidic mining waste.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%