Preparation and densification of bulk pyrite, FeS2

Ferreira, Helena M; Lopes, Elsa B.; Malta, José F.; Ferreira, L.M.; Santos, Luı́s F.; Pereira, M.F.C.; Moço, Duarte; Gonçalves, A.P.

doi:10.1016/j.jpcs.2021.110296

Cited by 8 publications

(1 citation statement)

References 35 publications

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“…It was observed that the main components of the precipitate were iron and sulfur, consistent with the results in Tables 1 and 2. As shown in Figure 10, iron mainly existed in the form of ferrous disulfide, and sulfur existed in the form of elemental sulfur [39]. The presence of ferrous disulfide provided the possibility for precipitate as a reducing agent for pyrolusite.…”

Section: Characterization Of Precipitatementioning

confidence: 99%

A Green Cyclic Leaching Process for Low-Grade Pyrolusite via a Recyclable Fe(II) Reductant

Wang,

et al. 2023

Minerals

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The low-cost Fe(II) reductants used in the leaching of pyrolusite usually cause high concentrations of iron ions in the leaching solution, which are difficult to treat and recover. Herein, a green cyclic leaching process for pyrolusite with recycling and reusing of Fe(II) reductants was developed. Sodium sulfide was introduced to reduce and precipitate iron ions in the leaching solution. Ep-H diagrams show that Fe3+ can be reduced to Fe2+ by S2− and form a precipitate with the high efficiency of 93.09%. Since the main component of the precipitate was ferrous disulfide with reducibility, it was used as a reducing agent for low-grade manganese oxide ores. A total of 97.96% of the manganese was highly reductively leached by the obtained precipitate of 0.28 g·g−1 ore. Furthermore, the leaching efficiency was almost unchanged after five iterations of cyclic experiments. The cyclic leaching process enables the efficient leaching of manganese and the recycling of iron, which provides a green and economic method for the efficient utilization of low-grade pyrolusite resources.

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Section: Characterization Of Precipitatementioning

confidence: 99%