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…
Low-moisture coal
Low-moisture coal occupies a particular niche in the global coal complex: it is valued for its higher energy density, better handling characteristics and improved performance in many industrial processes compared…
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…
Ultra-low-sulfur coal
Ultra-low-sulfur coal has become an increasingly important commodity in global energy and industrial markets. Characterized by very low sulfur content compared with conventional coals, this product meets stricter emissions requirements,…
Low-sulfur coal
Low-sulfur coal has become an important commodity in the global energy mix because it allows power generators and industrial users to meet air quality standards while avoiding some of the…
Ultra-low-ash coal
Ultra-low-ash coal occupies a niche but increasingly important position within the global coal complex. Defined by its exceptionally low residue after combustion or processing, this coal type serves as a…
Low-ash coal
Low-ash coal is a high-quality variety of coal characterized by a relatively low proportion of mineral matter (ash) after combustion. Because ash lowers the fuel value, increases handling and disposal…
Short-flame coal
Short-flame coal is a distinct category within the broad family of coals, recognized in some regions and markets for its specific combustion behavior and material properties. This article explores what…
Long-flame coal
Long-flame coal is a historically important and still widely used category of coal characterized by its distinctive burning behavior, broad occurrence in many coal basins, and versatile industrial applications. This…
House coal
House coal — commonly sold as lumps of coal intended for domestic heating and small-scale use — remains an important yet controversial energy commodity in many parts of the world.…
