矿渣粉与超细铁尾矿粉在无熟料固结体中的协同水化机制

doi:10.11896/cldb.22080235

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Abstract The amorphous aluminosilicate mineral composition on the surface of ultrafine iron tailing powder has hydration activity and can form a high strength clinker free consolidated body. However, it has the disadvantages of fast hydration rate in the early stage and low strength in the later stage. In this work, the effect of slag powder on the microstructure and strength of ultra-fine iron tailings based non-clinker consolidated body was investigated, the difference of the morphology, type and content of hydration products in hardened paste was analyzed, and the synergistic hydration hardening mechanism of the two mixtures in the process of non-clinker consolidation was studied. The results showed that when the ratio of ground iron tailings powder to slag powder was 1∶1, the strength above 78 MPa could be obtained without clinker consolidation in 28 days; XRD, TG-DSC analysis results and SEM micro morphology showed that the hydration products of iron tailings powder and slag powder were the same, both of which were aluminum-substituted calcium silicate hydrate (C-(A)-S-H) and Ettringite (AFt); the amount of AFt in the consolidated body was positively related to the proportion of slag powder in the early stage and controlled by the content of SO₃ in the system in the later stage; the linear expansion rate of consolidated body was positively correlated with AFt content; the pore structure of hardened samples could be improved obviously by adding slag powder and iron tailing powder, and the pore size distribution was optimal when the ratio of slag powder to iron tailing powder was 1∶1. This study confirms that slag powder and superfine iron tailing powder have obvious hydration synergistic effect in the process of non-clinker consolidation. The early hydration products of the amorphous components on the surface of superfine iron tailing powder play a consolidation and filling effect on the hardened slurry in the early stage. Their synergistic effect in the hydration process increases the amount of hydration products in the system, improving the pore structure of the slurry. The compactness is improved, and the conso-lidated body can obtain high mechanical properties and volume stability.

Key words： ultrafine iron tailings powder slag powder clinker free consolidated body amorphous composition synergistic hydration mechanism

Published: 25 November 2023 Online: 2023-11-21

CLC number:

TB321

Fund:National Natural Science Foundation of China (51834001).

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	AN Shuhao
	LIU Juanhong
	ZHANG Yueyue
	LI Kang

Cite this article:

AN Shuhao,LIU Juanhong,ZHANG Yueyue, et al. Synergistic Hydration Mechanism of Slag Powder and Ultrafine Iron Tailings Powder in Non-clinker Consolidated Body[J]. Materials Reports, 2023, 37(22): 22080235-10.

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http://www.mater-rep.com/EN/10.11896/cldb.22080235 OR http://www.mater-rep.com/EN/Y2023/V37/I22/22080235

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