P. Blanc, A. Lach, A. Lassin, M. Falah, R. Obenaus-Emler, S. Guignot, Modeling hydration of mine tailings: Production of hydraulic binders from alkali-activated materials, Cement and Concrete Research, Volume 137, 2020, 106216, ISSN 0008-8846, https://doi.org/10.1016/j.cemconres.2020.106216
Modeling hydration of mine tailings : production of hydraulic binders from alkali-activated materials
|Author:||Blanc, P.1; Lach, A.1; Lassin, A.1;|
1BRGM, 3 Avenue Claude Guillemin, BP6009, F-45060 Orleans, France
2University of Oulu, Oulu, Finland
3Montanuniversität Leoben, Leoben, Austria
|Online Access:||PDF Full Text (PDF, 1.9 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020110288929
|Publish Date:|| 2020-11-02
The production of alkali-activated materials and geopolymers from the finer fraction of tailings is being increasingly investigated, as they could be used for building and public works, or to retain heavy metals in a consolidated solid matrix. The present study proposes a Pitzer-based geochemical model to reproduce the alkaline leaching for two mine tailing samples and the polymerization reactions. The model fits the results of the leaching tests quite well over the reaction duration and up to NaOH 10 M and 60 °C. Discrepancy for the dissolved Mg concentration indicates that the database can handle ionic strength up to 5 mol.kg−1. A geopolymer solid solution was developed for setting reactions modeling. The results compare favorably with compressive strength tests results, with C-S-H, M-S-H and geopolymers as the main hydration products. The study proposes an innovative application of Pitzer database developments with application to the mining industry.
Cement and concrete research
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
113 Computer and information sciences
1172 Environmental sciences
116 Chemical sciences
216 Materials engineering
Financial support from the European community H2020 ITERAMS project (Grant Agreement No. 730480) and from the French Geological Survey (BRGM) is gratefully acknowledged.
|EU Grant Number:||
(730480) ITERAMS - Integrated mineral technologies for more sustainable raw material supply
© 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/).