Hydrothermal solidification of municipal solid waste incineration bottom ash with slag addition.
Hydrothermal solidification of municipal solid waste incineration bottom ash with slag addition.
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DOI：
10.1016/j.wasman.2010.03.024
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发表时间：
2010-08
期刊：
影响因子：
8.1
通讯作者：
Z. Jing;X. Ran;Fangming Jin;E. H. Ishida
中科院分区：
文献类型：
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作者：
Z. Jing;X. Ran;Fangming Jin;E. H. Ishida
在饱和蒸汽压（1.56MPa）、200°C、24 h的条件下，采用石英砂、消石灰和水冷高炉矿渣（WBFS）对城市垃圾焚烧底灰进行了水热固化试验。添加WBFS的强度增强效果最好。强度的发展主要是由于雪硅钙石的形成，雪硅钙石的形成致密了基体，从而促进了强度的发展。WBFS在初始水热过程中似乎具有比石英更高的反应性，这提供了更多的二氧化硅可用于硬化固化的试样。但较长的养护时间（24 h）有利于石英的溶解，形成雪硅钙石，从而提高石英的掺入强度。养护时间影响着材料的晶体形态演化，雪硅钙石的片状化对材料的强度有很大的增强作用。实验室浸出试验结果表明，经过水热处理后，固化体中重金属的溶出量得到有效降低。因此，水热处理可具有大规模再循环/再利用MSWI灰的高潜力。
Hydrothermal solidification of municipal solid waste incineration (MSWI) bottom ash has been carried out under saturated steam pressure (1.56MPa) at 200°C for up to 24h by mixing quartz, slaked lime and water-cooled blast furnace slag (WBFS). The strength enhancement for the WBFS addition was best. The strength development was shown to be due mainly to tobermorite formation, and the tobermorite formation densified matrix, thus promoting the strength development. WBFS seemed to have a higher reactivity than the quartz during the initial hydrothermal process, which provided more silica available to harden the solidified specimens. However, a longer curing time (24h) was favorable to the quartz dissolution for tobermorite formation, which in turn, enhanced the strength for quartz addition. Curing time affected the crystal morphology evolution, and the stubby plate of tobermorite seemed to result in a high strength enhancement in this study. Laboratory leaching tests were conducted to determine the amount of heavy metals dissolved from the final solidified specimens, and the leaching results showed that after hydrothermal processing the heavy metals dissolved from the solidified specimens were reduced effectively. As such, the hydrothermal processing may have a high potential for recycling/reusing MSWI ash on a large scale.