Coal cleaning residues and Fe-minerals implications

Silva, Luis; Macı́as, Felipe; Oliveira, Marcos L.S.; Boit, M. Kátia da; Waanders, F.B.

doi:10.1007/s10661-010-1340-8

Cited by 77 publications

(20 citation statements)

References 30 publications

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“…Villa et al 2008). In the Santa Catarina coals, the sulphides are typical authigenic nanominerals (Silva et al 2010). Pyrite was the only Fecontaining nanomineral detected, changing gradually during combustion to form a Fe-containing glass and nanohematite.…”

Section: Resultsmentioning

confidence: 95%

Nanominerals and nanoparticles in feed coal and bottom ash: implications for human health effects

Silva

Boit

2010

Environ Monit Assess

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Environmental and human health risk assessments of nanoparticle effects from coal and bottom ash require thorough characterisation of nanoparticles and their aggregates. In this manuscript, we expand the study of human exposure to nanosized particles from coal combustion sources (typically <100 nm in size), characterising the complex micromineralogy of these airborne combustion-derived nanomaterials. Our study focuses on bottom ash generated in the Santa Catarina power station (Brazil) which uses coal enriched in ashes, many potential elements (e.g. Cr and Ni) and pyrite. Transmission electron microscope data reveal nanoscale C deposits juxtaposed with and overgrown by slightly larger aluminosilicate (Al-Si) glassy spheres, oxides, silicates, carbonated, phosphates and sulphates. Iron oxides (mainly hematite and magnetite) are the main bottom ash products of the oxidation of pyrite, sometimes via intermediate pyrrhotite formation. The presence of iron oxide nanocrystals mixed with silicate glass particles emphasises the complexity of coal and bottom ash micromineralogy. Given the potentially bioreactive nature of such transition metal-bearing materials, there is likely to be an increased health risk associated with their inhalation.

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Section: Resultsmentioning

confidence: 95%

Nanominerals and nanoparticles in feed coal and bottom ash: implications for human health effects

Silva

Boit

2010

Environ Monit Assess

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“…The morphology, crystal structure, surface topography, and chemical composition of ultrafine minerals present in the pyrite ash, phosphogypsum, and concentrated sulphide were investigated using a Zeiss Model ULTRA Plus FE-SEM, with charge compensation for all applications on conductive as well as non-conductive samples, and a JEOL-2010F 200-keV HR-TEM equipped with an Oxford energy dispersive X-ray detector, and a scanning (STEM) unit (Silva et al, 2010b).…”

Section: Analytical Proceduresmentioning

confidence: 99%

Chemical composition and minerals in pyrite ash of an abandoned sulphuric acid production plant

Oliveira

Ward

Izquierdo

et al. 2012

Science of The Total Environment

162

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The extraction of sulphur produces a hematite-rich waste, known as roasted pyrite ash, which contains significant amounts of environmentally sensitive elements in variable concentrations and modes of occurrence. Whilst the mineralogy of roasted pyrite ash associated with iron or copper mining has been studied, as this is the main source of sulphur worldwide, the mineralogy, and more importantly, the characterization of nanoparticles, in coal-derived roasted pyrite ash remain to be resolved. In this work we provide essential data on the chemical composition and nanomineralogical assemblage of roasted pyrite ash. XRD, HR-TEM and FE-SEM were used to identify a large variety of minerals of anthropogenic origin. These phases result from highly complex chemical reactions occurring during the processing of coal pyrite of southern Brazil for sulphur extraction and further manufacture of sulphuric acid. Iron-rich nanoparticles within the ash may contain high proportions of toxic elements such as As, 2 Se, U, among others. A number of elements, such as As, Cr, Cu, Co, La, Mn, Ni, Pb, Sb, Se, Sr, Ti, Zn, and Zr, were found to be present in individual nanoparticles and nanominerals (e.g. oxides, sulphates, clays) in concentrations up to 5%. The study of nanominerals in roasted pyrite ash from coal rejects is important to develop an understanding on the nature of this by-product, and to assess the interaction between emitted nanominerals, ultra-fine particles, and atmospheric gases, rain or body fluids, and thus to evaluate the environmental and health impacts of pyrite ash materials.

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“…Os resíduos de carvão em toda região sul de Santa Catarina foram estudados por Silva et al (2011), que verificaram maior abundância da pirita entre os Fe-minerais presentes. Foram feitas 10 amostragens nas pilhas, cada uma contendo em média 2 kg do resíduo piritoso.…”

Section: Methodsunclassified

Avaliação Ecotoxicológica Do Resíduo De Mineração De Carvão

Filho

Baretta

Zortéa

et al. 2015

Rev. Bras. Ciênc. Solo

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RESUMO O descarte de grandes quantidades de resíduos de mineração de carvão modifica quimicamente o solo e isso pode alterar a estrutura e atividade da fauna edáfica. Objetivou-se estudar os efeitos ecotoxicológicos das deposições de resíduo piritoso (carvão mais a pirita) em dois solos, coletados em Santa Catarina, Argissolo Vermelho-Amarelo e Nitossolo Háplico, nas doses de 0; 2,5; 5; 10 e 20 % desse resíduo. Os testes realizados foram sobrevivência e reprodução de Enchytraeus crypticus e de germinação comAvena sativa e Lotus corniculatus. O valor de pH, independentemente do tipo do solo, diminuiu à medida que aumentou a dose de resíduo piritoso. O resíduo piritoso na menor dose resultou em efeitos negativos ao E. crypticus, como redução na taxa sobrevivência de adultos e nenhuma reprodução. Nos testes de sobrevivência e reprodução de enquitreídeos, o valor de LC50 (concentração estimada que pode causar efeitos negativos na sobrevivência e germinação em 50 % de um grupo de organismos) ficou abaixo 4 % e EC50 (efeitos negativos na reprodução) <2,5 % para os dois solos, respectivamente. A exposição de A. sativa aos dois solos não expressou efeito tóxico para L. corniculatus, no Nitossolo. Porém, no Argissolo, a contaminação causou efeitos na menor dose para L. corniculatus. No teste de germinação de sementes, somente L. corniculatus apresentou sensibilidade no Argissolo Vermelho-Amarelo (LC50<4 %). A elevada sensibilidade dos organismos do solo avaliado à aplicação do resíduo piritoso influenciou-os negativamente, tanto em um curto período de tempo quanto em longo prazo.

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Coal cleaning residues and Fe-minerals implications

Cited by 77 publications

References 30 publications

Nanominerals and nanoparticles in feed coal and bottom ash: implications for human health effects

Nanominerals and nanoparticles in feed coal and bottom ash: implications for human health effects

Chemical composition and minerals in pyrite ash of an abandoned sulphuric acid production plant

Avaliação Ecotoxicológica Do Resíduo De Mineração De Carvão

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