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A key environmental and technological problem for coal-fired generation in the Russian Federation is the overfilling of existing ash disposal sites. The total volume of accumulated solid coal combustion waste has reached 2 billion tons. It is important to emphasize that this figure reflects only the accumulated "legacy burden" and is not a fixed value: the industry generates about 20 million tons of new waste annually. Consequently, the actual mass of this waste requiring disposal or processing is steadily increas...