Study on sintering characteristics and carbonation behavior of magnesium slag based materials
YANG Fengming
ZHUAN Xiangyang
TAO Nengye
RUI Yafeng
ZHAO Sixue
ZHENG Yongchao
Abstract：This study systematically elucidated the phase evolution mechanisms of magnesium slag-based materials during sin-tering-carbonation processes and their carbonation properties.Results revealed that γ-C2S and β-C2S in raw magnesium slag served as dominant mineral phases,whose high carbonation activity and appropriate water-binder ratio underpinned its superior mechanical properties and carbon sequestration capacity.However,high-temperature sintering(1250～1350 ℃)induced phase reconstruction,par-tially transforming γ/β-C2S into C3S2 and low-reactivity Mg-Si-Ca phases,leading to significant deterioration in carbonation efficiency and compressive strength.After sintering modification of magnesium slag with sandstone(0～15％),the degradation of carbonization performance was intensified through a dual pathway,which suppressed the generation of γ/β-C2S and promoted the"Akermanite quartz"dual-phase blocking effect,reducing the proportion of carbonate products and causing simultaneous attenuation of carbon se-questration and compressive strength.
Keywords：magnesium slagsandstonesinteringcarbonization propertiescompressive strength
Publication Date：2025-10-25
Online Publishing Date：2025-11-28(First online date of this platform, not the publication date of the document)
Pages：7( 21-26,36 )