Effects of wet grinding combined with chemical activation on the activity of iron tailings powder

Yang, Yingchun; Yang, Zhiliang; Cheng, Zhuxin; Zhang, Haoyou

doi:10.1016/j.cscm.2022.e01385

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…Chemical activation results in the production of a greater amount of amorphous material in the IOTs compared to single wet mill activation. This leads to a more significant reduction in the surface binding energy of the chemical bonds within the IOT, which further enhances the activity of the IOTs [19]. Carvalho [20] developed a geopolymer using IOTs as a geopolymer precursor, and phosphoric acid (H 3 PO 4 ) as an activating agent responsible for resistance gain.…”

Section: Introductionmentioning

confidence: 99%

The Role of Chemical Activation in Strengthening Iron Ore Tailings Supplementary Cementitious Materials

Hu,

Gu,

Cheng

et al. 2024

Buildings

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The preparation of iron ore tailings (IOTs) into supplementary cementitious materials (SCMs) is an effective approach to achieve value-added utilization of industrial solid waste. This study systematically investigates the hydration pattern and strength development of Portland cement systems with the incorporation of IOTs, steel slag (SS), granulated blast-furnace slag (GBFS), and fly ash (FA) under the action of different chemical additives. The hydration products, and microstructure and pore structure of the SCMs are analyzed using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and mercury intrusion porosimetry. The findings of this study demonstrate that chemical activation plays a significant role in the strength development of SCMs. Among the five chemical activators tested, Triethanolamine (TEA) had the greatest influence on mechanical properties. The maximum compressive strength of the SCMs at 28 days was 42.9 MPa at a dosage of 1%. Specifically, the addition of TEA promotes volcanic ash reactions, and the high fineness of SCM provides nucleation sites for hydration products. Interactions between the volcanic ash reaction and the complexation reaction of TEA have a positive effect on compressive strength development. This research expands the potential for IOTs SCMs through chemical activation methods for value-added applications.

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Section: Introductionmentioning

confidence: 99%