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环境科学学报 2007
Fractal dimension analysis of typical semi-cokes based on mercury porosimetry
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Abstract:
Industrial semi-cokes are typical pore-rich particles with complex microscopic pore structure. Based on fractal theory, the fractal dimension was introduced to quantitatively characterize the roughness and complexity of the irregular pore structure. Samples derived from four different coals treated with different pyrogenation processes were selected. The pore structure of semi-coke particle samples with diameters between 2.36 mm and 3.35 mm were analyzed with the Mercury Porosimeter PoreMaster-60, based on which the corresponding fractal dimensions were calculated. The results indicate that the pore structure of industrial semi-cokes agrees with fraetal characteristics. The fractal dimensions are between 2. 7982 and 2. 9154, and the determination coefficients are in the range of 0. 9157 - 0. 9614. The fractal dimensions from the available samples in this study are relevant to coal ranks and/or different pyrogenation processes. The pore structure of industrial semi-cokes can be reasonably characterized with fractal dimensions in term of evaluating adsorption or activation abilities and determining appropriate activation methods.
