Influence of mechanical treatment and magnetic separation on the performance of iron ore tailings as supplementary cementitious material

Duarte, Marlo Souza; Almada, Bruna Silva; Santos, White José dos; Bessa, Sofia Araújo Lima; Bezerra, Augusto César da Silva; Aguilar, Maria Teresa Paulino

doi:10.1016/j.jobe.2022.105099

Cited by 15 publications

(9 citation statements)

References 51 publications

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“…A combination technique of air table, round screen, and modified magnetic separator is used to enhance mineral recovery in many mineral processing [24,25,26].…”

Section: Methodsmentioning

confidence: 99%

“…This study applied air table middling for feeding with given particle size (-20 mesh) obtained from a round screen (as seen in Figure 1). Back [24] used air table and magnetic separation for municipal solid waste incineration related to clean city maintenance, while Duarte [25] applied magnetics separation to discard iron ore tailings in cement material.…”

Section: Methodsmentioning

confidence: 99%

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Induced roll magnetic separator applied for high grade ilmenite separation from mining tailing

Dahani

Sundari

Somali

et al. 2023

Sinergi

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This article aimed to separate ilmenite (FeTiO3) mineral from tin tailing applying a single splitter IRMS (Induced Roll Magnetic Separator). Ilmenite mineral is the substantial main source for TiO2. This work used air table middling for feeding. The mineral components of middling feeding from air table using grain counting analysis were found as follows: cassiterite (48.61%), ilmenite (21.36%), monazite (18.56%), pyrite (4.60%), zircon (5.85%), quartz (0.71%), anatase (0.27%), and tourmaline (0.02%), It was found that electrical current and opening of single splitter affected the degree of separation addressing to ilmenite recovery and ilmenite grade. The finding showed that current of 15 Ampere and single splitter with opening 4.25 cm yielded ilmenite recovery more than 74%. The high grade ilmenite (90.46 %) and recovery of 29.38% was obtained using 5 Ampere with single splitter opening of 1.0 cm. Up to date, the study on ilmenite separation from tailing only focused on the effect of current, however, the effect of single splitter magnetic separator to enhance ilmenite recovery from other paramagnetic minerals such as monazite, siderite, xenotime and tourmaline has not yet been reported.

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“…A combination technique of air table, round screen, and modified magnetic separator is used to enhance mineral recovery in many mineral processing [24,25,26].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Induced roll magnetic separator applied for high grade ilmenite separation from mining tailing

Dahani

Sundari

Somali

et al. 2023

Sinergi

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“…However, the current research mainly focuses on IOT waste rock as concrete aggregate, which largely reduces the admixture of IOTs in concrete, limiting the application value of ultrafine IOTs, while powdered IOTs are more likely to cause dust and other environmental problems [11][12][13][14]. Therefore, in order to make full use of ultrafine IOTs and produce high value-added products, IOTs can be developed as supplementary cementitious materials (SCMs) for concrete, which further reduces the cost of producing both cement and concrete products, and achieves the purpose of multi-functionality between the utilisation of solid waste resources and the green production of concrete products [15][16][17]. While it is feasible to add small amounts of IOTs to cementitious supplementary cementitious materials, this may not fulfil the original purpose of researching SCMs, which were actually developed and applied to reduce clinker usage and hence carbon emissions from cementitious materials [18,19].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Hydration Mechanism of Iron Tailings–Cement-Based Supplementary Cementitious Materials

Hu,

Gu,

Liu

et al. 2024

Buildings

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The preparation of cement-based supplementary cementitious materials is an important method for the efficient use of iron tailings and the reduction in CO2 emissions. The aim of this study is to improve the reactivity of iron tailings by mixing them with steel slag, slag, and fly ash through orthogonal tests to solve the problem that iron tailings cannot be utilised on a large scale. The compressive strength, hydration products, and microstructure of the iron tailings–cement-based supplementary cementitious materials were investigated using ICP-OES, XRD, TG, FTIR, and SEM. The results revealed that each solid waste raw material played a distinct role in the hydration reaction. In the iron tailings–cement-based supplementary cementitious materials system, steel slag provided Ca2+, OH−, and Si4+ ions, slag provided Ca2+ and Al3+ ions, fly ash contributed a significant amount of Ca2+ and Al3+ ions, and iron tailings offered more nucleation sites and some Si4+ ions for the hydration products. Moreover, there was a synergistic effect among these four materials, promoting the formation of hydration products such as ettringite, C-(A)-S-H gels, and others. When the proportion of IOTs:SS:FA:SL was 9:8:8:2, the highest 7 d compressive strength of cementitious material was 24.8 MPa. When the proportion of IOTs:SS:FA:SL was 9:6:8:4, the highest 28 d compressive strength of cementitious material was 35.0 MPa. This study provides a comprehensive solution for the utilisation of iron tailings and contributes to the high-value green utilisation of solid waste.

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“…IOTs are highly crystalline, composed primarily of mineral phases like α-quartz and hematite, which have been shown to be nearly inert in many studies [13]. Although mechanical activation has been reported to enhance the pozzolanic activity of IOTs, thus improving the performance of IOT-based cementitious systems [14,15], Duarte et al [16] found that mechanically activated IOTs did not exhibit volcanic ash activity, suggesting a predominant nucleation effect. Undoubtedly, mechanical activation is an effective method to treat IOTs, but it is inconclusive whether IOTs only play a physical role as fillers, or are also involved in the pozzolanic reaction.…”

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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Influence of mechanical treatment and magnetic separation on the performance of iron ore tailings as supplementary cementitious material

Cited by 15 publications

References 51 publications

Induced roll magnetic separator applied for high grade ilmenite separation from mining tailing

Induced roll magnetic separator applied for high grade ilmenite separation from mining tailing

Mechanical Properties and Hydration Mechanism of Iron Tailings–Cement-Based Supplementary Cementitious Materials

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

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