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- W2108171063 abstract "The demineralization of coal by selective agglomeration using pentane as an agglomerant which has been called the “T-process”involves two steps: first, the raw coal is reduced to some particle size smaller than 0.5 mm. And secondly, the fine coal is recovered from a dilute raw coal water slurry by the dispersion of pentane in the slurry. The pentane envelopes the coal particles which allows the formation of liquid bridges between the coal particles that results in a water immiscible mass of coal and pentane. The latter is separated from the dispersed mineral matter in the water phase by some simple mechanical procedure. The coal recovery from very fine raw coals is normally in excess of 95%. The pentane is recovered by evaporation/condensation for reuse in the process leaving the demineralized coal for utilization either as a slurry or as dry pellets. Pilot operations using this process have produced over 125 tons of pyrite-free product coal with an average ash content in the range of 0.8 wt%. A detailed discussion of the extent of mineral release during comminution is coupled with examples of deashing of raw coals into the range below 0.3 wt % ash and over 95% pyrite extraction from typical steam coals. The salient points of the relationship between particle size distribution and mineral release are established. The broad applicability of selective agglomeration with pentane to the mineral separation from over 100 different seams of coal is illustrated. The stable gas content in a milled slurry was related to the agglomer-ation time data for thirty different seams of coal. The relationship from those data suggested that the degree of hydrophobicily of the coal surface of the particles was the common factor. The processing costs are estimated to be in the range of $0.60 per million BTU." @default.
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- W2108171063 date "1990-01-01" @default.
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- W2108171063 title "The Demineralization of Coal Using Selective Agglomeration by the T-Process" @default.
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- W2108171063 doi "https://doi.org/10.1080/07349349008905169" @default.
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