Palynology of Bonito and Barro Branco coal seams from Rio Bonito Formation (Lower Permian of Paraná Basin) in the Criciúma coal region, southernmost Brazil

Pereira, Zélia; Mendes, Márcia; Souza, Paulo Alves de; Rodrigues, Cristina; Fernandes, Paulo; Ade, Marcus Vinicius Berão; Araújo, Carla Luzia França; Almeida, Jonathan Resende de; Santos, Edmílson Moutinho dos; Rocha, Haline; Santos, Vitor Emanoel Siqueira; Araújo, B.P.; Garavaglia, Luciane; Sousa, M. J. Lemos de

doi:10.1016/j.jsames.2019.01.009

Cited by 8 publications

(1 citation statement)

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“…These studies [25][26][27][28], carried out with coal in the southern region of Brazil, raise concerns related to the negative impacts attributed to environmental quality that are capable of covering large regions, generating environmental unsustainability. Of the three states mentioned above (Paraná, Santa Catarina and Rio Grande do Sul), the state of Santa Catarina contains 80% of Brazil's known coal reserves, totaling approximately seven layers of coal in areas destined for mining activities [27,29]. The majority of Santa Catarina 200+ coal mines are open pit mines, accounting for 3,643,000 tons of coal extracted annually, which represents a total of 50% of the mineral coal extracted in Brazil [27,30].…”

Section: Introductionmentioning

confidence: 99%

Brazilian Coal Tailings Projects: Advanced Study of Sustainable Using FIB-SEM and HR-TEM

et al. 2022

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The objective of this study is to obtain a more detailed assessment of particles that contain rare-earth elements (REEs) in abandoned deposits of Brazilian fine coal tailings (BFCTs), so as to aid current coal mining industries in the identification of methodologies for extracting such elements (Santa Catarina State, Brazil). The BFCT areas were sampled for traditional mineralogical analysis by X-ray Diffraction, Raman Spectroscopy and nanomineralogy by a dual beam focused ion beam (FIB) coupled with field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) coupled with an energy dispersive X-ray microanalysis system (EDS). The results show that the smaller the sampled coal fines were, the higher the proportion of rare-earth elements they contained. Although the concentration of REEs is below what would normally be considered an economic grade, the fact that these deposits are already ground and close to the surface negate the need for mining (only uncovering). This makes it significantly easier for REEs to be extracted. In addition, owing to their proximity to road and rail transport in the regions under study, the opportunity exists for such resources (BFCTs) to be utilized as a secondary market as opposed to simply being discarded as has been done in the past.

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