城市垃圾焚烧灰渣熔融处理中PbO-PbCl2氯氧化物的热力学性质

以城市垃圾焚烧灰渣熔融处理中铅氯氧化物体系为研究对象,根据高温X射线衍射及固相氯氧化物的活度测定结果,对PbO-PbCl2系组成相图、PbO相对化学位及固相中间化合物的标准生成自由能等Pb-O-Cl系的热力学性质进行了研究,从而为熔融处理中铅氯氧化物的生成和沉聚反应的热力学解析提供理论依据.此外,基于液相安定函数及理想会合熔体模型,讨论了PbO-PbCl2系液相安定性对熔体中形成氯氧化物复杂离子的影响.结果表明,稳定存在的中间化合物为PbCl2.PbO,PbCl2.2PbO及PbCl2.4PbO.

Thermodynamic Analysis of PbO-PbCl2 Oxychlorides Formed During Urban Refuse Incineration/Melting

Investigates thermodynamically the Pb-oxychlorides formed during urban refuse incineration/melting by way of high-temperature XRD and activity determination of such solid oxychlorides, including the binary phase diagram of PbO-PbCl2, the relative chemical potential of PbO and standard free energy of formation or Gibbs free energy of activation of intermediate compounds. A thermodynamical basis is thus provided for the formation and precipitation reaction of Pb-oxychlorides during melting. Furthermore, the stability function and ideal associated solution model are employed to discuss the effect of stability of liquid PbO-PbCl2 on the formation of complex ionic species. The results show that the stable intermediate compounds are PbCl2 · PbO, PbCl2 · 2PbO and PbCl2 · 4PbO.