Composite coal
This article examines the subject commonly referred to as composite coal — a term that can denote both geological composite samples and engineered blends of different coal types used to…
Synthetic coal
This article examines the phenomenon commonly referred to as synthetic coal alongside conventional coal. It covers geological occurrence, extraction methods, economic and statistical context, industrial uses, environmental consequences, and emerging…
Coal-to-liquid feedstock
This article examines coal as a feedstock for coal-to-liquid (CTL) processes: its geology, global occurrence, mining and supply, economic importance, statistics, industrial uses, environmental challenges and technological trends. Coal remains…
Low-mercury coal
This article examines the topic of low-mercury coal from geological occurrence to mining regions, market dynamics, industrial uses and environmental implications. Low-mercury coal has become an important commodity as regulators,…
High-volatile A coal
This article examines the properties, distribution, extraction, economic role and industrial uses of high-volatile A bituminous coal. It explains what distinguishes this rank from other coals, where significant deposits are…
De-ashed coal
De-ashed coal is a processed form of coal from which mineral matter (ash) and many inorganic impurities have been substantially reduced or removed. Through a variety of physical and chemical…
High-carbon coal
High-carbon coal, a term that commonly refers to coal ranks with a high proportion of fixed carbon such as anthracite and certain grades of bituminous coal, remains an important component…
Carbon-rich hard coal
This article examines the geological nature, distribution, extraction, economic importance and industrial uses of high-carbon hard coal — a group of coals valued for their high fixed carbon content and…
Low-rank coal
Low-rank coals — commonly referred to as lignite and sub-bituminous coals — occupy an important but often misunderstood position in the global energy mix. Characterized by high moisture content, relatively…
Ovoid coal
Ovoid coal is a term that can refer both to a particular morphological form of coal lumps and to the broader category of coal as a vital geological and industrial…
