how is lignite extracted any one process
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The lignite sample, about 50 g (daf), is filled in a fixed bed reactor which can be heated by an electrical oven outside. The solvent, water, is pumped by high pressure metering pump into system and is first preheated by an electrical heater, then into reactor, where the lignite is extracted by the solvent.
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Although strip mining is the most efficient method of extracting lignite in purely economic terms, its impact on the environment (especially the lowering of the water table and the destruction of the landscape) is considerable. Water must be removed from the rock overlying the lignite seam for geotechnical reasons.
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