[en] Historically, the Basque Country has been a territory of great industrial activity, especially in the field of steel manufacturing. For this reason, today it is the autonomous community that generates the most waste from the metallurgical industry in all of Spain, where most of it is made up of black steel slag, around 370,000 tons of slag annually. Despite the fact that a large volume of this slag is valued by sectors such as construction or the metallurgical industry itself, a large part of black steel slag is disposed of in Basque landfills, a figure that has increased in recent years, with the consequent environmental impact that this entails. Taking into account the need to identify new possibilities for the recovery of steel slag, and the great room for improvement in terms of waste heat recovery from the Basque industry, detailed by the Basque Energy Agency in its annual reports, the use of it as a thermal storage material, it is presented as a potential possibility of recovery in a strategic sector such as the energy sector. Therefore, in order to promote energy recovery practices, in this document, in addition to analyzing the physical-thermal properties of slag, an analysis of the economic, energy and environmental benefits that the recovery of slag, as a raw material for thermal storage systems, if these were installed in all electric arc furnaces in the Autonomous Community of the Basque Country. Likewise, this possibility of energy recovery, together with various possibilities promoted by the Basque public administration in the construction sector, would constitute a great step for the Autonomous Community of the Basque Country towards a more circular economy where slag would go from being considered as a waste deposited in a landfill, to be considered as a low cost and high performance by-product.

[eu] Historikoki, Euskal Herria industria jarduera handiko lurraldea izan da, batez ere altzairugintzaren alorrean. Hori dela eta, gaur egun Espainiako metalgintzako industriatik hondakin gehien sortzen duen autonomia erkidegoa da, gehienak altzairu beltzezko zepaz osatuta daude, urtero 370.000 tona zepa inguru. Nahiz eta zepa horren kopuru handia eraikuntza edo metalurgia industria bezalako sektoreek baloratzen duten, altzairuzko zepa beltzaren zati handi bat euskal zabortegietara botatzen da, azken urteetan gora egin duen kopurua horrek dakarren ingurumen-inpaktua. Altzairuzko zepak berreskuratzeko aukera berriak identifikatzeko beharra eta euskal industriaren hondakinen beroa berreskuratzeko hobetzeko aukera bikaina kontuan hartuta, Energiaren Euskal Erakundeak bere urteko txostenetan zehazten duen erabilera kontuan hartuta biltegiratze termikoko material gisa, energia sektorea bezalako sektore estrategiko batean berreskuratzeko aukera gisa aurkezten da. Hori dela eta, energia berreskuratzeko praktikak sustatzeko, dokumentu honetan, zepen propietate fisiko-termikoak aztertzeaz gain, berreskuratzeak dakartzan onura ekonomikoak, energetikoak eta ingurumenekoak aztertzen ditu. zepak, biltegiratze termikoko sistemetarako lehengai gisa, horiek Euskal Autonomia Erkidegoko arku elektrikoko labe guztietan instalatuko balira. Era berean, energia berreskuratzeko aukera hori, euskal administrazio publikoak eraikuntzaren sektorean sustatutako hainbat aukerarekin batera, urrats handia izango litzateke Euskal Autonomia Erkidegoarentzat ekonomia zirkularrago baterantz. zabortegian gordetako hondakina, kostu baxuko eta errendimendu handiko azpiproduktu gisa kontsideratzeko.