He Niu, Mariam Abdulkareem, Harisankar Sreenivasan, Anu M. Kantola, Jouni Havukainen, Mika Horttanainen, Ville-Veikko Telkki, Paivo Kinnunen, Mirja Illikainen, Recycling mica and carbonate-rich mine tailings in alkali-activated composites: A synergy with metakaolin, Minerals Engineering, Volume 157, 2020, 106535, ISSN 0892-6875, https://doi.org/10.1016/j.mineng.2020.106535
Recycling mica and carbonate-rich mine tailings in alkali-activated composites : a synergy with metakaolin
|Author:||Niu, He1; Abdulkareem, Mariam2; Sreenivasan, Harisankar1;|
1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, FI-90570 Oulu, Finland
2Lappeenranta-Lahti University of Technology, School of Energy Systems, Department of Sustainability Science, P.O. Box 20, FI-53851 Lappeenranta, Finland
3NMR Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
|Online Access:||PDF Full Text (PDF, 10 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020101484110
|Publish Date:|| 2020-10-14
The main objective of this paper was to investigate the alkali activation of mine tailings (MT) after mechanochemical activation and the effect of metakaolin (MK) addition. Finnish mica-rich tailings from a phosphate mine were studied as precursors for alkali-activated materials (AAM) with a potential application as a substitute for ordinary Portland cement (OPC). The principal physical properties (water absorption, apparent porosity and unconfined compressive strength) were measured for samples containing 30% to 70% tailings. Zeolite phases such as natrolite and cancrinite were observed and the formation of C-(N)-A-S-H¹ and N-A-S-H gels was identified by XRD, DRIFT, FESEM-EDS and NMR technologies. A life cycle assessment (LCA) was conducted on specimens in comparison to OPC. This work indicated that phosphate MT can be recycled through alkali activation with lower CO₂ emission compared to all-metakaolin geopolymers and that the binder phase formed at the most promising tailings contents (60– 70%) was C-(N)-A-S-H gel.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
216 Materials engineering
The authors gratefully acknowledge the financial support from the Academy of Finland [grants #292526, #319676 and #326291] and the European Union’s EU Framework Programme for Research and Innovation Horizon 2020 [Grant Agreement No 812580 (“SULTAN”, https://etn-sultan.eu)]. V.-V.T. thanks the Academy of Finland (grants #289649, 294027 and 319216) for the financial support.
|EU Grant Number:||
(812580) SULTAN - European Training Network for the remediation and reprocessing of sulfidic mining waste sites
|Academy of Finland Grant Number:||
292526 (Academy of Finland Funding decision)
319676 (Academy of Finland Funding decision)
326291 (Academy of Finland Funding decision)
289649 (Academy of Finland Funding decision)
294027 (Academy of Finland Funding decision)
© 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).