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…
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…
