Modeling hydration of mine tailings: Production of hydraulic binders from alkali-activated materials

Research output: Contribution to journalArticleResearchpeer-review

Authors

  • Philippe Blanc
  • Adeline Lach
  • Arnault Lassin
  • Mahroo Falah
  • Sylvain Guignot

Organisational units

External Organisational units

  • BRGM
  • University of Oulu

Abstract

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.

Details

Original languageEnglish
Article number106216
Number of pages11
JournalCement and concrete research
Volume137.2020
Issue numberNovember
DOIs
Publication statusE-pub ahead of print - 9 Sep 2020