Coal mining - Extraction, Processing, Pollution: In geologic terms, coal is a sedimentary rock containing a mixture of constituents, mostly of vegetal origin. Vegetal matter is composed mainly of carbon, hydrogen, oxygen, nitrogen, sulfur, and some inorganic mineral elements. When this material decays under water, in the absence of oxygen, the carbon …

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The image database used in this study includes 28 SEM images of coal particles in TIFF format with pixel resolution of 1024×943, and each image contains approximately 150 coal particles. For the SEM images in the paper, when the magnification is 100 and 400, 1pixel is equal to 2.9 and 0.7 μm respectively.

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