maceral


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maceral

[¦mas·ə¦ral]
(geology)
The microscopic organic constituents found in coal.
References in periodicals archive ?
Oil shale, dark mudstone and coal samples were selected for organic maceral analysis in this study.
Liptinite macerals rarely exceed 15% and vanish with increasing depth (Kcdzior and Jelonek, 2013).
Microscopic (petrographic) study of coal has long been used to study the kinds and amounts of macerals and minerals.
Los parametros de madurez termal fueron calibrados con respecto al Ro, que en el caso de los carbones presenta condiciones petrograficas optimas para llevar a cabo las mediciones del maceral vitrinita.
Se encontro que existe una relacion directa entre las relaciones atomicas H/C y O/C con el contenido del maceral barquinita.
Coal petrographical techniques, such as the determination of vitrinite reflectance and maceral analysis, have been used successfully over the past years to identify the provenance of coal artifacts excavated by archaeologists.
The main maceral components are laminated algae, pollen and planktonic algae, with traces of liptodetrinite and humic organic material [12].
Earlier researchers have investigated the effects of maceral and microlithotypes on grindability of coal (Jorjani et al" 2008; Trimble and Hower, 2003; Hower, 1998; Hower and Calder, 1997; Gray and Patalsky, 1990; Hower and Wild, 1988).
The vitrinite maceral represents one of the most important maceral in coal, due to its high reactivity in coal transformation processes.
The used coal was characterized by maceral analysis, coking properties, proximate analysis and the elemental composition of the coal substance.
The formed char depends on maceral content, coal rank, particle size, char formation temperature, minerals presence [Cloke, 1994], microlitotypes and litotypes content [Bailey, 1990], heating rate during devolatilization, gas room [Chan, 1999] and residence time [Jones, 1999].
A method of density separation was performed to obtain coal samples covering a wide range of maceral and mineral matter content.