Twelve coals were subjected to leaching procedure with an aqueous solution containing an
acid or a chelating agent, such as EDTA. The susceptibility of each metal in coal for the …

The removal of mineral matter from coal was attempted by caustic digestion followed by acid
washing. A mild treatment at 460 K was found to be sufficient to remove most minerals and …

Most of the ash-forming minerals in bituminous coals are insoluble in water or acids, but a
high proportion (more than 90%) can be extracted with aqueous sodium hydroxide solutions …

The leachability of metals from fly ash produced by a coal‐fired electric plant and a
municipal waste incinerator under acidic conditions was experimentally investigated. The …

Assam and Talcher (bituminous) coals have been subjected to batch aqueous alkali
treatment followed by extraction. It has been shown that alkali treatment increased …

Samples of raw coal, fly ash and bottom ash have been collected from a Chinese power
plant together with laboratory ash obtained by ashing of the coal under 850° C. Comparative …

Low rank or low-grade (LRC or LGC) coals are most abundant distribute around the several
regions in the world. The contribution of low-rank coal is a significant role in the energy …

The authors have recently presented a new coal extraction method by which various kinds of
coals ranging from brown coals to bituminous coals could be extracted up to 80% of the …

A new method is proposed for examining the modes of occurrence of trace elements in coal.
This method consists of acid leaching of not only raw coal but also the low-temperature ash …

100-400 ppm/day, but they fall off even more rapidly than the HC1 leaching rates. The
leaching of vanadium is exceptionally rapid, with initial rates of 1000-3000 ppm/day. In …