Journal
MINERALS ENGINEERING
Volume 157, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2020.106535
Keywords
Mine tailings; Metakaolin; Geopolymers; Gel chemistry; Life cycle assessment; Zeolite; Mechanochemical activation
Funding
- Academy of Finland [292526, 319676, 326291, 289649, 294027, 319216]
- European Union [812580]
- Academy of Finland (AKA) [319676, 292526, 292526, 319676] Funding Source: Academy of Finland (AKA)
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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-H-1 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.
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