Mineral matter and trace elements in coals of the Gunnedah Basin, New South Wales, Australia

Ward, Colin R.; Spears, D. A.; Booth, C.A.; Staton, Ian; Gurba, Lila W.

doi:10.1016/s0166-5162(99)00006-3

Cited by 224 publications

(96 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The minerals were identified by reference to the ICDD Powder Diffraction File. Quantitative analysis of mineral abundance was carried out using the Siroquant™ processing software (Taylor, 1991), based on the principles developed by Rietveld (1969), using procedures discussed further by Ward et al (1999).…”

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

161

View full text Add to dashboard Cite

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.

show abstract

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

161

View full text Add to dashboard Cite

show abstract

“…The confident level of mercury occurrence in coal was estimated 6 out of 10 (Finkelman 1994). It is generally considered that mercury can be presented in coal as sulfide and selenides, in forms associated with pyrite and marcasite (Ward et al 1999;Hower et al 2008;Kolker 2012), calcite and chlorite (Zhang et al 2002), selenio-galena (Dai et al 2006b(Dai et al , 2015, clausthalite (Hower and Robertson 2003), kleinite and cinnabar (Brownfield et al 2005), sphalerite (HgFeS 2 ) and getchellite (Dai et al 2006a). It can also organically bounded to organic matter (HgOM) (Rumayor et al 2015), or even as HgS and metallic mercury (Hg 0 ) (Finkelman 1994;Yudovich and Ketris 2005).…”

Section: Introductionmentioning

confidence: 99%

The distribution and occurrence of mercury in Chinese coals

Bai

Wang

et al. 2017

Int J Coal Sci Technol

View full text Add to dashboard Cite

Mercury is one of the most concerned hazardous elements in coals. 1018 coal samples of different coal-forming periods, coal-accumulating areas and coal ranks all over the country were collected to study the distributions of mercury in Chinese coals. The modes of occurrence of mercury were studied with float-sink experiments of 10 coals from different basins in China and correlation analyses were conducted between concentrations of mercury and maceral and sulfur contents, as well as the ash yield. The theoretic concentrations and affinities of mercury in vitrinite, inertinite, clay and pyrite were then calculated following the methods proposed by Solari. The weighted average concentration of mercury in Chinese coals is 0.154 lg/g, which is similar to that in the word coals in general. The mercury concentrations vary largely in the coals of different coal-forming period and coal-accumulating areas as geological settings play key roles in determining the geochemistry of mercury. The concentrations of mercury in coals from south and southwest China and those from North China of C 3 -P 1 are relatively higher while those from North China of J 1-2 and Northeast of J 3 -K 1 relatively lower. The general distribution trends of mercury are very similar to that of ash yield, sulfur contents in coals. Pyrite is the dominant carrier of mercury in most coals, especially in some high-sulfur coals with abundant epigenetic pyrite formed during diagenesis and metamorphism. Mercury has higher affinity to vitrinite than to inertinite in most coals, which accords with the geological origin of macerals and geochemistry of mercury.

show abstract

“…The abundance and modes of occurrences of mineral matter are resulted from processes associated with peat accumulation and rank advance, the interaction of the organic matter with basinal fluids, sediment diagenesis, and in some cases, synsedimentary volcanic inputs [3][4][5][6][7]. Thus minerals in coals provide information about the depositional conditions, geologic history of coal-bearing sequences, and regional tectonic evolution [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and Geochemical Characteristics of the Early Permian Upper No. 3 Coal from Southwestern Shandong, China

et al. 2016

View full text Add to dashboard Cite

Abstract:The Upper No. 3 coal of the Early Permian age is a major workable seam in the southwestern Shandong coalfield, which is located in the eastern part of North China. From Early Jurassic to Neogene, the coalfield was subjected to intensive tectonic processes, leading to a significant rearrangement in depth of coal seams. In this paper, three Upper No. 3 coals occurring at´228,´670 and´938 m in the Luxi, Liangbaosi, and Tangkou mines, respectively, were collected to investigate their mineralogical and geochemical characteristics, with emphasis on modes of occurrence and origin of epigenetic minerals. The three coal seams are similar in vitrinite reflectance, volatile matter yield, and maceral components, suggesting insignificant influence from the tectonic activities on coal rank. Terrigenous minerals (e.g., kaolinite and quartz) are comparable in both types and distribution patterns in the three coals. The presence of siderite and pyrite of syngenetic or penecontemporaneous origin indicate they were emplaced during peat accumulation. The distribution of epigenetic minerals (e.g., calcite, ankerite, and dolomite) are associated with the underground water activities, which were Ca (Mg, Fe)-bearing.

show abstract

Mineral matter and trace elements in coals of the Gunnedah Basin, New South Wales, Australia

Cited by 224 publications

References 34 publications

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

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

The distribution and occurrence of mercury in Chinese coals

Mineralogical and Geochemical Characteristics of the Early Permian Upper No. 3 Coal from Southwestern Shandong, China

Contact Info

Product

Resources

About