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Effect of coal weathering on some geochemical parameters

Abstract:

The effect of coal weathering on some geochemical parameters was studied. Seven pairs of fresh and altered samples were selected from different Venezuelan coal deposits. The following analyses were performed: water and ash percent, heating value, bitumen content and composition, infrared spectroscopy, n-alkane distribution and humic substances concentration (HS). As weathering proceeds, there is a corresponding change in HS concentration. Most geochemical parameters show small changes with HS concentrations below 15%. For intense weathering, all parameters measured show important modifications. Such changes are due to the breaking of the coal's macrostructure. © 1995.