Thermodynamic behavior of rare metals in the melting process of municipal solid waste (MSW) incineration residues.
Thermodynamic behavior of rare metals in the melting process of municipal solid waste (MSW) incineration residues.
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DOI：
10.1016/j.chemosphere.2007.03.071
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发表时间：
2007-09
期刊：
影响因子：
8.8
通讯作者：
C. Jung;M. Osako
中科院分区：
文献类型：
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作者：
C. Jung;M. Osako
研究了稀有金属元素在城市垃圾焚烧残渣熔融过程中的热力学行为。几个选定的稀有金属元素的命运进行了研究，使用两种方法：实验和热力学平衡计算在两个实际的熔化厂。结果表明，Ag，Bi，Ga，Ge，In，Pd，Sb，Te和Tl容易以氯化物和/或气态形式挥发，然后在熔化炉飞灰中冷凝。另一方面，Cr、Ni、Ta、V和Zr倾向于大部分残留在熔融炉渣中。Sn在还原条件下作为SnS（g）挥发，而在氧化条件下挥发被抑制。从热力学上讲，在氧化条件下，Mn以MnCl 2（g）形式的总挥发与高有效氯一起发生。然而，在实际的植物中，只有一小部分被挥发。至于Co、Mo和W，尽管计算表明这些元素可以形成挥发性金属氯化物和挥发性有机物，但在实际工厂中没有发生挥发。实际工厂熔炼炉的非平衡性和非均匀性可以解释这种差异。这项研究提供了一个很好的定性观点的稀有金属在熔化过程中的行为，但需要进一步的研究，以产生一个更准确的模拟和解决的差异。
This study aims to identify the thermodynamic behavior of rare metal elements during the melting process of municipal solid waste incineration residues. The fate of several selected rare metal elements was investigated using two approaches: experimental and thermodynamic equilibrium calculation at two actual melting plants. The results revealed that Ag, Bi, Ga, Ge, In, Pd, Sb, Te, and Tl are readily volatilized as chloride and/or gaseous forms and then condensed in melting furnace fly ash. On the other hand, Cr, Ni, Ta, V, and Zr tend to mostly remain in molten slag. Sn is volatilized as SnS (g) under reducing conditions while volatilization is suppressed under oxidizing conditions. Thermodynamically, total volatilization of Mn as MnCl2(g) occurred with highly available chlorine under oxidizing conditions. However, at the actual plants, only a small proportion was volatilized. As for Co, Mo, and W, no volatilization occurred at the actual plants although the calculations suggest that these elements can form volatile metal chloride and volatilize. Non-equilibrium and heterogeneity of the actual plant melting furnace could explain the discrepancy. This study provided a good qualitative view of the behavior of rare metals in the melting process, but further investigation is required to produce a more accurate simulation and to resolve the discrepancy.