Piemonti A, Conforti A, Cominoli L, Luciano A, Plizzari G, Sorlini S
Department of Civil, Environmental, Architectural Engineering, and Mathematics (DICATAM), University of Brescia, 25123 Brescia, Lombardy Italy.
Department for Sustainability, ENEA (Italian National Agency for New Technologies, Energy and Sustainable Economic Development), Resource Valorization lab, Via Anguillarese 301, 00133 Rome, Lazio Italy.
Waste Biomass Valorization. 2022 Oct 13:1-21. doi: 10.1007/s12649-022-01940-5.
A greater reuse of steel slags would bring considerable benefits both from an environmental and economic point of view. The development of tools and strategies to monitor at different scales resources and waste flows would allow for better resource planning and a more sustainable management on territory. The aim of this study is to investigate and analyse the supply chain that deals with the management of steel slags at meso-level, in order to investigate the state of implementation of industrial symbiosis (IS), its potential and its improvement. A Mass Flow Analysis (MFA) has been implemented, through big data analysis coming from the integration of regional and provincial databases with a careful data processing from questionnaires. This integrated methodology has proved to be a valid tool to monitor the recovery and reuse, the implementation of industrial symbiosis and to plan improvement actions. This paper reports a representation of the current situation regarding the production, recovery and reuse of these materials in production processes for which they are suitable, with a view to their full exploitation, following the principles of circular economy and an analysis of the mutual exchange that occur among steelmaking plants and other business partners in a network of industrial companies. The results showed that most of the steel slags managed at meso-level (Province of Brescia, Italy) is still unfortunately destined for landfill with low percentage of them classified as by-product highlighting as the IS is not adequately applied. Of the slag destined for treatments and recovery processes, almost all of them are Electric Arc Furnace slag, which are mainly reused for hydraulically bound base layers and road sub-bases (about 85% of the total recovered) and as aggregates for the production of cement and bituminous mixes (about 15% of the total recovered). Results shows as further effort should be made in term of policies and strategies to incentivize IS and to increase the recovery.
从环境和经济角度来看，更大程度地再利用钢渣将带来可观的效益。开发不同尺度监测资源和废物流的工具和策略，将有助于更好地进行资源规划，并在区域范围内实现更可持续的管理。本研究的目的是调查和分析中观层面处理钢渣管理的供应链，以研究产业共生（IS）的实施状况、潜力及其改进。通过整合区域和省级数据库的大数据分析，并结合问卷进行仔细的数据处理，实施了质量流分析（MFA）。这种综合方法已被证明是监测回收和再利用、产业共生实施情况以及规划改进行动的有效工具。本文展示了这些材料在其适用的生产过程中的生产、回收和再利用现状，以期遵循循环经济原则充分利用这些材料，并分析钢铁厂与工业公司网络中的其他商业伙伴之间发生的相互交换。结果表明，不幸的是，在中观层面（意大利布雷西亚省）管理的大多数钢渣仍被运往垃圾填埋场，只有一小部分被归类为副产品，这凸显了产业共生未得到充分应用。在运往处理和回收过程的炉渣中，几乎所有都是电弧炉渣，主要用于水硬性基层和道路底基层（约占总回收量的85%），以及作为生产水泥和沥青混合料的骨料（约占总回收量的15%）。结果表明，在政策和策略方面应进一步努力，以激励产业共生并提高回收率。
