Investigation of the commercial feasibility of ash removal from lignite by density separation.
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The tests reported here have shown that ultrafine grinding of lignite can be an effective means of separating the ash into particles which can be removed by density separation techniques. A single separation of the samples yielding the 1.6 float and 1.6 sink materials would result in the beneficiation indicated for the lignites. For the Mississippi lignite ground at 100 deg F with air, it was found that the removal of the particles with a specific gravity greater than 1.6 would reduce the mass of the sample by 20 pct while reducing the ash content by 60 pct. For the other Mississippi materials, which were all from another pit, the removal of the particles with a specific gravity greater than 1.6 would reduce the mass by 15 pct while reducing the ash content by 32 pct. For the North Dakota lignite the removal of the mass fraction with specific gravity greater than 1.6 would reduce the mass by about 10 pct with a 40-pct reduction in ash content. For the Texas lignite, a 10-pct reduction in mass could yield a 45-pct reduction in ash. For the Wyoming subbituminous coal, a 4-pct reduction in mass could yield a 25-pct reduction in ash content.
Mineral-processing; Mineral-dusts; Coal-processing; Coal-products; Coal-dust
CP; Final Contract Report
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Mississippi State University