He Niu, Paivo Kinnunen, Harisankar Sreenivasan, Elijah Adesanya, Mirja Illikainen, Structural collapse in phlogopite mica-rich mine tailings induced by mechanochemical treatment and implications to alkali activation potential, Minerals Engineering, Volume 151, 2020, 106331, ISSN 0892-6875, https://doi.org/10.1016/j.mineng.2020.106331
Structural collapse in phlogopite mica-rich mine tailings induced by mechanochemical treatment and implications to alkali activation potential
|Author:||Niu, He1; Kinnunen, Päivö1; Sreenivasan, Harisankar1;|
1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, FI-90570, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 4 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020061543291
|Publish Date:|| 2020-06-15
The alkali activation of mine tailings is of interest to diminish the impoundment storage of large waste stream from mining industry. However, most of the mine tailings, like phosphate mine tailings generated in Finland, are rather inert and need pre-treatment to induce the reactivity for alkali activation. In this work, mechanochemical treatment was conducted to improve the reactivity of phosphate mine tailings. The ground specimens were subjected to the crystal structural analysis of X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and thermal analyses by Thermogravimetry/Differential Thermal Analysis (TG/DTA), showing the increment of amorphous content and structural degradation as a function of grinding time. The subsequent alkaline reactivity test illustrated incremental alkaline dissolution of Si, Al and K and a schematic diagram of altered phlogopite structure (sources of aluminosilicates in tailings) was also proposed. Additionally, the mineralogical composition of individual particles was carried out by mineral liberation analysis (MLA), thereby evaluating the influence of pre-treatment on the mineralogy of tailings. The results indicate profound micromorphological changes and structural cleavage of the precursor due to grinding, which strongly increase alkaline reactivity.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
216 Materials engineering
This work was supported by the Academy of Finland [grants #292526 and #326291]and European Union’s EU Framework Programme for Research and Innovation Horizon 2020 [Grant Agreement No 812580 (“SULTAN”, https://etn-sultan.eu)].
|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)
© 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).