Deep-cleaned coal
Deep-cleaned coal is an engineered product of coal preparation and upgrading processes designed to remove impurities and improve fuel properties. Over the past decades, advancements in coal washing, beneficiation and…
Improved thermal coal
Improved thermal coal refers to conventional thermal coal that has undergone physical or chemical processing to raise its **calorific value**, reduce impurities (ash, **sulfur**, moisture and trace metals), and improve…
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 concentrate
Coal concentrate is a processed form of coal produced by cleaning and concentrating raw coal to increase its energy content and reduce impurities. It plays a key role in modern…
La Francia Coal Mine – Colombia
La Francia Coal Mine, located in Colombia, is an example of the country’s medium- and large-scale **coal** operations that connect local geology, national economy and global energy markets. This article…
Low-phosphorus coal
Low-phosphorus coal occupies a special niche within the global coal complex: it is a grade of coal with unusually low concentrations of phosphorus, prized by industries that demand high-purity feedstocks.…
Refined coal
This article explores the concept of refined coal — what it is, how it differs from raw coal, where it is found and produced, and its economic, industrial and environmental…
De-watered coal
De-watered coal is not a distinct geological variety but a processed form of coal with significantly reduced water content. It plays a growing role wherever low-rank coals (high moisture, low…
Ultra-cleaned thermal coal
The term ultra-cleaned thermal coal refers to thermally graded coal that has undergone intensive beneficiation and cleaning processes to remove ash, sulfur, moisture and other impurities, producing a fuel with…
Chemical-grade coal
This article examines the specialised category commonly called chemical-grade coal — varieties of coal selected or processed for use as a raw material in chemical, metallurgical and high-value industrial applications.…
