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The pore structure of the raw coal samples and those subjected to the LN 2 -FT treatment were analyzed by a scanning electron microscope (Quanta 250, FEI Co. (b) Lignitous coal sample. A total of 1800 coal and gangue images after graying were obtained in the . Aerial view of a coal burning power plant Aerial view of a lignite burning power station in North Rhine Westphalia - Germany. Young female artist painting with charcoal on paper.Browse Getty Images' premium collection of high-quality, authentic Coal Handling stock photos, royalty-free images, and pictures.
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