Upcycling sintering red mud waste for novel superfine composite mineral admixture and CO2 sequestration

Songhui Liu, Yuanyuan Shen, Yuli Wang, Peiliang Shen, Dongxing Xuan, Xuemao Guan, Caijun Shi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

To utilize the sintering red mud waste(SRM)on a large scale and sequester CO2, a room temperature in-situ wet carbonation method was proposed for activation of SRM. The wet carbonation reaction process of SRM was investigated, and the evolution of phase composition, microstructure and pore structure during carbonation of the SRM was revealed by XRD, TG/DTG, FT-IR, NMR, SEM and nitrogen adsorption. Moreover, the feasibility of carbonated SRM (C-SRM) as a high value-added mineral admixture was explored. The results showed that the carbonation of SRM produced a large number of fine calcite crystals and silica-alumina gel with high polymerization. After 3 h of carbonation, the SRM achieved a CO2 sequestration rate of 15.3%, calcite (Cc) yield of 86.5% and Na+ leaching rate of 81.8%. The C-SRM possessed a high pozzolanic reactivity and fine particle size, showing its potential as a cement mineral admixture.

Original languageEnglish
Article number104497
JournalCement and Concrete Composites
Volume129
DOIs
Publication statusPublished - May 2022

Keywords

  • Calcite
  • In-situ wet carbonation
  • Microstructure
  • Silica-alumina gel
  • Sintering red mud (SRM)

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science

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