Investigation and analysis of the forms and energies of the binding of moisture with coal

The paper gives the results of investigations to determine the various forms of bond of moisture with the material and the corresponding values of the bond energies for different types of hard coals obtained by the analysis of thermograms and drying curves and also of adsorption isotherms. Data are presented which show that the moisture in coals is inhomogeneous in composition and nonequivalent in physical properties. It is characterized both by physicomechanical (capillary moisture of various states) and physicochemical (adsorbed moisture in poly- and monomolecular form) forms of binding. The range of quantitative amounts of moisture of the various forms is extremely considerable and varies for the types of coal investigated between 4.1 and 8.45% for the hygroscopic moisture and between 0.4 and 4.71% for moisture adsorbed in monomolecular form. 4 refs.