TY - RPRT TI - Separation of unburned carbon from coal fly ash through froth flotation; Sekitanbai no shisshiki datsutanso gijutsu kaihatsu shiken AB - Coal ash tends to become containing more unburned carbon and porous substances depending on conditions of combustion, whose adverse effects to products due to water adsorbability, absorbability and color tones create obstacles in its utilization. Therefore, research and development works have been progressed on wet type carbon removing technology which is characterized in that coal is pulverized to preferable degrees and subjected to flotation. This paper reports the results obtained during fiscal 1995. The results may be summarized as follows: as a result of the comparison test on a column flotation machine and an FW type flotation machine of machine stirring type, the former machine showed better flotation efficiency; several methods were investigated on crushing as a treatment prior to flotation, whereas a mixer with greater circumferential speed and a homo mixer showed the highest efficiency; strength of the impact to the flotation efficiency was found to decrease in the order of pulp concentration > pretreatment time > collector addition ratio; and as a result of the evaluation on refined ash as a cement admixture and carbons as fuel, possibilities were found in them for practical application. 16 figs., 2 tabs. AU - "Miwa, T [Center for Coal Utilization, Japan, Tokyo (Japan)]" AU - "Murakami, T [The Coal Mining Research Center, Japan, Tokyo (Japan)]" KW - "01 COAL, LIGNITE, AND PEAT" KW - "FLY ASH" KW - "COAL" KW - "DECARBONIZATION" KW - "AQUEOUS SOLUTIONS" KW - "PYROLYTIC CARBON" KW - "COMBUSTION KINETICS" KW - "POROUS MATERIALS" KW - "ADSORPTION" KW - "HYGROSCOPICITY" KW - "COLOR" KW - "FLOTATION" KW - "STIRRING" KW - "CRUSHING" KW - "ANGULAR VELOCITY" KW - "MIXERS" KW - "ADDITIVES" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/623071 PB - CY - Japan PY - 1996 DA - 1996-09-01 LA - Japanese J2 - [] VL - C1 - Center for Coal Utilization, Japan, Tokyo (Japan) C2 - C3 - ETDE/JP-98750585 C4 - C5 - Available from Center for Coal Utilization, Japan, 3-4, Okubo 2-chome, Shinjuku-ku, Tokyo, (Japan); OSTI as DE98750585 L3 - Other Information: PBD: Sep 1996; Related Information: Is Part Of 6th Conference on Coal Utilization Technology; PB: 305 p.; Dai 6 kai sekitan riyo gijutsu kaigi koenshu ER -