Coal, containing all the elements that are present in nature and more than 200 minerals, has
a complex chemical structure, making it one of the most complex geological materials …

Peat depositional environments, the sites where and conditions under which peat
accumulates, significantly influence a resultant coal's physical properties, chemical …

Coal, coal measure gas, coal conversion to oil and gas, and coal-based new materials are
reliable guarantees for stable energy supply and economic and social development in …

Coal is a complex geologic material composed mainly of organic matter and mineral matter,
the latter including minerals, poorly crystalline mineraloids, and elements associated with …

Coal is a resource primarily used for electric power generation, and currently supplies 41%
of global electricity needs. Coal can also be considered as an economic source of …

A series of 20 coal samples were subjected to sequential leaching with ammonium acetate,
hydrochloric acid, hydrofluoric acid, and nitric acid to quantify the modes of occurrence of …

Coal deposits have attracted much attention in recent years as promising alternative raw
sources for rare earth elements and yttrium (REY), not only because the REY concentrations …

The material classed as “mineral matter” in coal embraces crystalline mineral materials as
well as a range of inorganic elements that occur in non-crystalline form. This review outlines …

Coal, one of the most complex geological materials, consists of organic and mineral matter,
the latter including crystalline minerals, non-crystalline mineraloids, and elements with non …

The extent of marine influence on the Paleogene Bohai Bay Basin in northeastern China,
which accumulated mainly continental (eg, fluvial and lacustrine) facies, remains under …