Nut coal
Nut coal is a widely recognized commercial grade of coal, principally defined by its particle size and practical applications rather than by a single chemical composition. It occupies a middle…
Coal middlings
This article examines the phenomenon commonly called coal middlings — the intermediate-sized, intermediate-quality fractions produced during coal mining and preparation. Coal middlings occupy a complex place between high-grade clean coal…
Coal for ferroalloys
This article examines the role of coal specifically used in the production of ferroalloys. It covers geological occurrence, major mining regions, the coal qualities prized by ferroalloy producers, plant-level processing…
Coal fines
This article examines the often-overlooked fraction of coal known as coal fines — the small particles and powdered material generated during mining, handling, crushing and processing of coal. Coal fines…
Lean coal
This article explores the technical, economic and geopolitical dimensions of what is commonly referred to as “lean coal” — lower-energy, lower-volatile types of coal often used for power generation rather…
