Phase Evolution Regulation and Strength Formation Mechanism of Autoclaved Materials from Iron Tailings
SU Yufeng
LI Bo
LI Haifeng
GUO Xiaolu
Abstract：To realize the efficient resource utilization of iron tailings,autoclaved materials were prepared by completely replacing quartz sand with iron tailings.The effects of autoclaving temperature and constant temperature duration on the mechanical properties of the materials were systematically investigated,and the phase composition and micromorphology of hydration products were analyzed by means of X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show that the optimal autoclaving process parameters of the material are 180℃for 5 h under constant temperature.Under these conditions,the main products are calcium silicate hydrate(C-S-H(Ⅰ)),(C-S-H(Ⅱ))and tobermorite.The phase evolution and strength development of the autoclaved material can be divided into four stages,and the content change of tobermorite is highly positively correlated with the compressive strength of the material,confirming that it is the key phase for the formation of material strength.
Keywords：autoclaving aegimephase evolutiontobermoritemicrostructural analysisformation mechanism
Publication Date：2026-02-28
Online Publishing Date：2026-04-07(First online date of this platform, not the publication date of the document)
Pages：8( 167-174 )