Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Cluster C, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8540, Japan.
Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Cluster C, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8540, Japan.
Chemosphere. 2019 Aug;228:513-520. doi: 10.1016/j.chemosphere.2019.04.177. Epub 2019 Apr 27.
We explored the effects of gas emission by mixtures undergoing alkali-activation of municipal solid waste incineration fly ash (MSWIFA) and pyrophyllite (the mixtures included dehydrated pyrophyllite, MSWIFA, 14 mol/L aqueous sodium hydroxide, and sodium silicate; curing proceed at 105 °C for 24 h). We measured the compressive strengths of the derived solid composites. The causes of gas emission, and the physical and chemical properties of products created under controlled gas emission, were investigated. Hydrogen was emitted after mixing MSWIFA and alkali. The compressive strength of products prepared when gas emission was complete was 2-3.4-fold greater than that of products prepared when gas emission was incomplete. X-ray micro-tomography and mercury intrusion porosimetry showed that products formed during complete gas emission tended to have smaller pores. X-ray diffraction and nuclear magnetic resonance (Al and Si) indicated that the aluminum substitution levels in tectosilicate differed under such conditions, although the minerals were identical. Thus, complete gas emission after mixing improved ultimate products.
我们探索了碱激发城市生活垃圾焚烧飞灰（MSWIFA）和叶蜡石混合物排放气体的效果（混合物包括脱水叶蜡石、MSWIFA、14 mol/L 氢氧化钠和硅酸钠；在 105°C 下固化 24 小时）。我们测量了所得固体复合材料的抗压强度。研究了气体排放的原因以及在受控气体排放下生成的产品的物理和化学性质。混合 MSWIFA 和碱后会排放氢气。当气体排放完全时制备的产品的抗压强度比气体排放不完全时制备的产品高 2-3.4 倍。X 射线微断层扫描和压汞法表明，在完全气体排放过程中形成的产品往往具有更小的孔。X 射线衍射和核磁共振（Al 和 Si）表明，在这种条件下，层状硅铝酸盐中的铝取代水平不同，尽管矿物相同。因此，混合后的完全气体排放提高了最终产品的性能。
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