| 摘要 |
PURPOSE:To increase the efficiency of coal refining and deashing independently of variation in particle size distribution of raw material coal, by classifying coal into ash-rich and low ash lots by flotation of dust coal, deashing the two lots separately and preparing a slurry of a mixture of the two lots. CONSTITUTION:A frother 24 and a collector 25 are added to a slurry composed of dust coal 41 and water 44 in a conditioning tank 4. The slurry is fed into a flotation machine 1 for separation into refined coal 11 with a low ash content and tailing 12 with a high ash content. The refined coal 11 is sent into an oil- extension granulator 53 for addn. of heavy fuel oil 27, granulation and preparation of deashed coal 42, while the tailing 12 is sent into the oil-extension granulator 53 for addn. of heavy fuel oil 27, deashing, granulation and preparation of deashed coal 21. The coal 42 and coal 21 are fed into a coal/oil slurry making tank 3, where heavy fuel oil 27 and surfactant 26 are mixed into the coal for formation of a coal/oil slurry 15.
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