No.51 石炭灰とカルシウムを原料とした新規吸着剤の調製(熱分解・コークス,その他)

概要

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We attempt to prepare a novel adsorbent from coal fly ash and lime. Coal fly ash was mixed with NaOH powder to heat at 600 °C for 6 h in electric furnace, and, after cooling to room temperature, the obtained fused powder was mixed with lime. The mixture was then stirred in distilled water at room temperature for 1 day to prepare the product. With increasing the lime addition to the fused powder, the product changes from amorphous material to the mixture of calcite [CaCO_3] and portlandite [Ca(OH)_2], that of calcite and hydrocalumite [Ca_4Al_2O_8(CO_3)・11H_2O], and finally that of calcite, hydrocalumite and portlandite. While removal ability of the product for NH_4^+ is almost same, those for Pb^<2+> and PO_4^<3-> increase, with increasing lime addition. These results indicated that a novel adsorbent with the removal abilities for NH_4^+, Pb^<2+> and PO_4^<3-> could be prepared from coal fly ash and lime.
2010-09-21