Coal Macerals | Indiana Geological & Water Survey
Macerals are microscopically recognizable constituents of organic matter in coal. The term maceral was first used by Stopes in 1935 for a component of coal detected under a microscope. Over the years, the ICCP has established standard rules for maceral analysis, maceral definitions and classifications.
Coal MaceralsTutorial | Petrographic Atlas | SIU
There are three basic groups of macerals, the vitrinite group derived from coalified woody tissue, the liptinite group derived from the resinous and waxy parts of plants and the inertinite group derived from charred and biochemically altered plant cell wall material.
Maceral Analysis - an overview | ScienceDirect Topics
Maceral analysis is standardized in the ISO 7404/3 (1994a) and ASTM D2799-05 (2005a) norms and is used to determine on a volumetric basis the relative proportions of the coal components in a representative coal sample.
Maceral - an overview | ScienceDirect Topics
Macerals refer to the organic remains found in peat biomass, primarily originating from plants, that undergo various chemical, physical, and biological transformations before and after being incorporated into the peat. These macerals can be observed and used to model coal sequences at different scales, ranging from macroscopic to microscopic.
Macerals, Coal, Kentucky Geological Survey, University of Kentucky
2023年1月5日 · Macerals are the altered remains and byproducts of the original plant material from which the coal-forming peat originated. Macerals are to coal as sediment grains and cements are to sedimentary rocks. Coal petrographers (people who study coal under a microscope) separate macerals into three groups, each of which includes several maceral types.
Coal Macerals - an overview | ScienceDirect Topics
Table 2.2 presents a list of the more frequently occurring maceral types, alongside their plant precursors. Density-gradient centrifugation has allowed good separations of the main maceral groups, as well as individual maceral types including cutinites, resinites, sporinites, fusinites and semifusinites (Crelling and Bensley, 1995). Table 2.2.
What are macerals? - IFRF
2002年4月22日 · The organic units or macerals that make up a coal mass can be identified in all ranks of coal. In essence, macerals are divided into three main groups: [GLOSS]Vitrinite[/GLOSS] (also known as [GLOSS]Huminite[/GLOSS] ), which consists of woody material;
Maceral | Definition & Facts | Britannica
maceral, any of the numerous microscopically recognizable, individual organic constituents of coal with characteristic physical and chemical properties. Macerals are analogous to minerals in inorganic rocks, but they lack a definite crystalline structure. Macerals are coalified plant remains preserved in coal and other rocks. They change ...
Coal macerals and their separation methodologies – A review
2021年1月1日 · Macerals are microscopically recognizable organic entities found in coal. On the basis of their optical properties they are classified into three categories, liptinite, vitrinite, and...
Table 1 shows the different classication of. – fi microlithotypes based on maceral volume. Coal macerals can be classied broadly into two groups, fi reactives and inerts. The maceral which...
- 某些结果已被删除