Loughborough University
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Laboratory scale evaluation of hyperspectral imaging sorting of refurbishment plasterboard waste

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conference contribution
posted on 2022-10-06, 12:01 authored by Miguel Castro-DiazMiguel Castro-Diaz, Mohamed OsmaniMohamed Osmani, Sergio Pialarissi-CavalaroSergio Pialarissi-Cavalaro, Íñigo Cacho, Iratxe Uria, Paul Needham, Jeremy Thompson, Bill Parker, Tatiana Lovato
At present, post-consumer plasterboard waste sorting is carried out manually by operators, which is time consuming and can be costly. In this work, a hyperspectral imaging system has been evaluated for automatic plasterboard waste sorting. Segregated plasterboard samples were crushed and sieved to obtain gypsum particles less than 250 microns, which were characterised through X-ray fluorescence to determine their chemical purity levels. It was found that the chemical purity of gypsum from refurbishment plasterboard waste obtained with the laboratory scale HSI-based sorting system was close to 96 wt%. Refurbishment plasterboard waste particles < 10 mm in size were not processed with the HSI-based sorting system because the manual processing of these particles at laboratory scale would have been very time-consuming. Since refurbishment plasterboard waste particles < 10 mm in size contained very small amounts of impurities, the segregated gypsum obtained from this unprocessed material had a chemical purity similar to that of the sorted plasterboard. The combination of unprocessed refurbishment plasterboard waste < 10 mm with sorted plasterboard ≥ 10 mm in size would lead to a plasterboard recovery yield above 98 wt%.


Innovative Circular Economy Based solutions demonstrating the Efficient recovery of valuable material Resources from the Generation of representative End-of-Life building materials

European Commission

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  • Architecture, Building and Civil Engineering

Published in

Proceedings SUM 2022


6th Symposium on Circular Economy and Urban Mining (SUM - 2022)




  • VoR (Version of Record)

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© CISA Publisher - Eurowaste Srl

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This is a conference paper presented at the 6th Symposium on Circular Economy and Urban Mining (SUM - 2022) and will be published in upcoming Proceedings SUM 2022 by CISA Publisher: https://cisapublisher.com/

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  • en


Capri, Italy

Event dates

18th May 2022 - 20th May 2022


Dr Miguel Castro Diaz. Deposit date: 30 September 2022

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