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Assessment of the influence of aqueous solutions chemistry on the water absorbency of recycled superabsorbent polymers

Lotiyé Elisée Poudama, Shyaka Auguste Rwamurinda, Mamert Mbonimpa, Tikou Belem, Abdelkabir Maqsoud, Khadija El Mahboub, Cyrille Ngandu Kabamba, Nor el-hoda Addi, Jean-François Lemay

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Mining

ABSTRACT: This study aims at understanding the effect of water chemistry on the absorbency of superabsorbent polymers (SAP) that can be used for densification of tailings slurries. For this purpose, the absorbency of recycled SAP from unused hygienic diapers was determined for different aqueous solutions by varying their sulphates and salts concentrations and their pH. A SAP dosage of 4 g/L was mainly used. Experimental results obtained 72 hours after the SAP addition into the solutions showed that the absorption rate is at its maximum in deionized water. However, the addition of cations from salts in the solution has shown a drastic reduction in the SAP™s absorption rate. The ensuing pH of the solution showed that the acidity had an inhibitory effect on the SAP™s absorption rate.

RÉSUMÉ: Cette étude vise à comprendre l™effet de la chimie de l™eau sur le pouvoir absorbant de polymères super absorbants (SAP) pouvant être utilisés pour la densification des pulpes de résidus miniers. À cette fin, le pouvoir absorbant des SAP recyclés à partir de couches hygiéniques non utilisées a été déterminé pour différentes solutions aqueuses en faisant varier leurs concentrations en sulfates ainsi qu™en sels et leur pH. Une dose de SAP de 4 g/L a été principalement utilisée. Les résultats obtenus après 72 heures de résidence du SAP dans les solutions ont montré que la capacité d™absorption est maximale dans l™eau dé-ionisée. Cependant, l'addition de cations provenant de sels à la solution a montré une réduction drastique de la capacité d'absorption du SAP. Le pH des solutions a montré que l™acidité avait un effet inhibiteur sur la capacité d™absorption du SAP.

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Cite this article:
Lotiyé Elisée Poudama; Shyaka Auguste Rwamurinda; Mamert Mbonimpa; Tikou Belem; Abdelkabir Maqsoud; Khadija El Mahboub; Cyrille Ngandu Kabamba; Nor el-hoda Addi; Jean-François Lemay (2019) Assessment of the influence of aqueous solutions chemistry on the water absorbency of recycled superabsorbent polymers in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper451, author = Lotiyé Elisée Poudama; Shyaka Auguste Rwamurinda; Mamert Mbonimpa; Tikou Belem; Abdelkabir Maqsoud; Khadija El Mahboub; Cyrille Ngandu Kabamba; Nor el-hoda Addi; Jean-François Lemay,
title = Assessment of the influence of aqueous solutions chemistry on the water absorbency of recycled superabsorbent polymers ,
year = 2019
}