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Compared to nitrogen drying process, the mechanical thermal expression (MTE) drying process, a typical non-evaporation drying process with great potential in large-scale application, results in significantly different changes in characteristics of lignite such as pore structures, mineral matters contents and particle size. In this study, the effects of the evolutions of coal properties during nitrogen...
A typical Chinese lignite was subjected to H2O, CH3COONH4/HCl and HCl/HF/HCl leaching procedures, to study the influence of water-soluble salts, alkali and alkaline earth metals (AAEMs) organically bound to the coal substance or occur as acid-decomposable minerals and discrete mineral matters on moisture adsorption property of lignite. Variations of pore structure and chemical functional groups of...
Shengli lignite from China was treated by hydrothermal dewatering (HTD) under 200–300°C. The changes of physico-chemical structure and surface properties of Shengli lignite were tested and the relationship between these changes was analyzed. The equilibrium moisture content of Shengli lignite decreased from 29.75% in raw coal to 7.40% in HTD-300 (the sample treated by HTD under 300°C) due to the decomposition...
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