Environmental magnetic studies are widely used to trace sources of anthropogenic pollution and have revealed promising applications to the urban waste management system. Here, a collection of solid samples from Municipal Solid Waste Incinerators (MSWI) were studied to probe the capability of geochemical and magnetic data integration as a tool for assessing mineralogy, grain-size, and metal enrichment. A data set of room-temperature magnetic parameters was compared with chemical data by X-ray fluorescence and electron microscopy observations. The aim was to validate or reject methods for urban mining purposes, testing and exploiting the correlations that magnetic properties typically experience with iron and heavy metals, as well as their relation to magnetic grain-sizes (from mm-scale down below 30 nm). We noted that the room-temperature magnetic data of MSWI ashes, used to assess grain-size according to the magnetic domain states, is complicated by the clumping of tiny and large grains displaying similar magnetic properties, so it needs to be supported by optical methods or more advanced magnetic techniques. On the other hand, the integration between magnetic and geochemical data, constrained by the analyses of the magnetic/diamagnetic extracts, helped in assessing magnetic mineral assemblages and potential metal enrichment.

环境磁研究被广泛用于追踪人为污染的来源，并揭示了在城市废物管理系统中的有希望的应用。在这里，对来自市政固体废物焚化炉（MSWI）的一系列固体样品进行了研究，以探究地球化学和磁数据整合的能力，以此作为评估矿物学，粒度和金属富集的工具。通过X射线荧光和电子显微镜观察，将室温磁参数数据集与化学数据进行比较。目的是验证或拒绝用于城市采矿目的的方法，测试和利用铁和重金属通常具有的磁性能与磁粒度之间的关系（从毫米级到30 nm以下）。我们注意到，用于根据磁畴状态评估晶粒尺寸的MSWI灰的室温磁数据由于显示相似磁性能的细小晶粒和大晶粒的团簇而变得复杂，因此需要光学方法来支持或更先进的磁性技术。另一方面，磁性和地球化学数据之间的整合受到磁性/反磁性提取物分析的限制，有助于评估磁性矿物组合和潜在的金属富集。