Super-low-volatile coal
Super-low-volatile coal is a specialized, high-rank form of coal valued primarily for its high fixed carbon content, low volatile matter, and strong performance in metallurgical and high-temperature industrial applications. This…
Specialty metallurgical blend coal
Specialty metallurgical blend coal occupies a distinct and strategically important place in the global energy‑metals chain. Unlike steam coal used predominantly for power generation, metallurgical (or coking) coal is selected…
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…
High-rank coal
High-rank coal occupies a distinctive place among fossil fuels. Often associated with superior energy density, lower volatile content and a higher fixed carbon fraction, this class of coal plays specific…
Supercritical coal grade
This article examines the concept commonly referred to as supercritical coal grade and, more broadly, the relationship between coal quality and the technologies known as supercritical and ultra-supercritical power plants.…
High-moisture coal
High-moisture coal is a broad category of low-rank coals that contain a significantly higher share of water in their natural state than medium- and high-rank coals. These coals play an…
High-sulfur coal
High-sulfur coal is a distinctive and consequential category of fossil fuel whose chemical makeup, geographic distribution and economic implications have shaped energy systems, industrial processes and environmental policy for more…
High-volatile bituminous coal
High-volatile bituminous coal occupies an important place among the ranks of coal used around the world. This article summarizes its geological characteristics, where it occurs and is mined, economic and…
Semi-anthracite
Semi-anthracite is a distinct rank of coal that occupies a middle ground between high-grade anthracite and the more common bituminous coals. It combines many of the advantageous physical and chemical…
