Distribution behavior of inorganic constituents in chemical recycling processes of a municipal waste slag
Distribution behavior of inorganic constituents in chemical recycling processes of a municipal waste slag
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城市废渣化学回收过程中无机成分的分布行为
DOI：
10.1016/j.jascer.2013.03.003
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发表时间：
2013
影响因子：
2.3
通讯作者：
T. Nanba
中科院分区：
文献类型：
--
作者：
K. Omura;S. Sakida;Y. Benino;T. Nanba
开发了一种无机废物的化学回收工艺，将废物玻璃化后，进行热处理并在酸中浸泡，得到无色透明的富SiO_2玻璃。研究了城市废渣中硅、磷、钛、铝等组分的分布行为。成分分析表明，酸处理后的固体相由SiO_2、P_2O_5和TiO_2组成，说明P、Ti原子在分相过程中优先分布在富SiO_2相中。然而，在高分辨显微分析中，观察到P和Ti原子与Si原子分开分布，它们存在于不溶于酸的不同颗粒中。结果表明，不溶固体的形成是溶解-再沉淀过程，即玻璃化渣中的所有成分在酸中溶解后，P_2O_5和T_2O_2以颗粒形式共同沉淀，而T_2O_2是P_2O_5沉淀所必需的。二氧化硅在含磷和含钛的颗粒中也分别以颗粒形式析出。
A chemical recycling process of inorganic wastes has been developed, where after vitrifying wastes, the glasses were heat-treated and soaked in an acid, obtaining colorless and transparent SiO2-abundant glasses. In the present study, distribution behavior of the constituents such as Si, P, Ti, Al and so on present in a municipal waste slag was examined. According to compositional analyses, the recovered solids after acid treatment consisted of SiO2, P2O5and TiO2, suggesting the preferential distribution of P and Ti atoms into SiO2-rich phase during phase separation. In high resolution microscopic analyses, however, it was observed that P and Ti atoms were distributed separately from Si atoms, and they were present in the different particles insoluble in the acid. It was finally concluded that the insoluble solids were produced by a dissolution–reprecipitation process, that is, once all the constituents of the vitrified slag were dissolved in the acid, P2O5and TiO2coprecipitated as particles, and TiO2was indispensable for the precipitation of P2O5. SiO2also precipitated as particles separately from P- and Ti-containing particles.