Poster De Conférence Année : 2023

Assessing the environmental and economic potential benefits of coal mining wastes upcycling into concrete products

Résumé

Coal extraction is today still on-going generating an important amount of coal material wastes (CMW) that lead to additional costs for the mine operator as well as to environmental burdens. To reduce these impacts, these CMW can be seen as raw materials for the construction sector and more especially regarding their use in concrete panel production or in the production of polymer concrete. This study assesses the potential environmental and economic benefits of using these CMW as secondary raw materials. The system under assessment is here a multi-functional system, as the system boundaries include both the management of the CMW and the production of specific products to be used in the construction sector (pre-cast concrete panel and polymer concrete). The inventory associated with the business-as-usual scenario is built using company data from both mining operators and concrete panel producers. A special focus is put on the modelling of the long-term emissions in groundwater associated with the presence of a waste storage facility in the mine site. These emissions are calculated based on specific on-site data and a generic geochemical model. Regarding the business-as-usual scenario, preliminary results show that the main impacts associated to the wastes management are due to first the diesel consumption associated to machinery and secondly to the direct emissions to groundwater due to the presence of the wastes themselves. For the concrete panel production, the largest share of the impacts are due to the cement production. This business-as-usual scenario is compared to different recycling scenarios where secondary materials are mixed with primary ensuring a same product quality than the one assed in the business-as-usual scenario. The results of the environmental comparison assessed through life cycle assessment are also monetarized using proven methodology in order to be included in a cost-benefits assessment. The results provide sound decision-making indicators for both the actors of the coal mining and the building sectors regarding the use of CMW as raw materials.
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Dates et versions

hal-04167196 , version 1 (24-04-2024)

Identifiants

  • HAL Id : hal-04167196 , version 1

Citer

Stéphanie Muller, Frédéric Lai, C Ngrembgo-Koussou, Marco Nucci, Edoardo Segù, et al.. Assessing the environmental and economic potential benefits of coal mining wastes upcycling into concrete products. LCM2023 - 11th International Conference on Life Cycle Management, Sep 2023, Lille, France. . ⟨hal-04167196⟩

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