Iron ore tailings as a supplementary cementitious material in the production of pigmented cements

Magalhães, Luciano Fernandes de; França, Sâmara; Oliveira, Michelly dos Santos; Peixoto, Ricardo André Fiorotti; Bessa, Sofia Araújo Lima; Bezerra, Augusto César da Silva

doi:10.1016/j.jclepro.2020.123260

Cited by 62 publications

(16 citation statements)

References 65 publications

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“…The composites SF and QPC had a reduction in water absorption by 50% and 8%, respectively, compared to the RS composite. This indicates that pozzolanic activity acted more significantly in pore refinement and decreased water absorption to the filler effect [106][107][108][109] .…”

Section: Resultsmentioning

confidence: 95%

Influence of quartz powder and silica fume on the performance of Portland cement

Tavares

Costa

et al. 2020

Sci Rep

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Supplementary cementitious materials interact chemically and physically with cement, influencing the formation of hydrate compounds. Many authors have analyzed the filler and pozzolanic effect. However, few studies have explored the influence of these effects on hydration, properties in the fresh and hardened states, and durability parameters of cementitious composites separately. This study investigates the influence of the replacement of 20% of Portland cement for silica fume (SF) or a 20-µm medium diameter quartz powder (QP) on the properties of cementitious composites from the first hours of hydration to a few months of curing. The results indicate that SF is pozzolanic and that QP has no pozzolanic activity. The use of SF and QP reduces the released energy at early times to the control paste, indicating that these materials reduce the heat of hydration. The microstructure with fewer pores of SF compounds indicates that the pozzolanic reaction reduced pore size and binding capability, resulting in equivalent mechanical properties, reduced permeability and increased electrical resistance of the composites. SF and QP increase the carbonation depth of the composites. SF and QP composites are efficient in the inhibition of the alkali-aggregate reaction. The results indicate that, unlike the filler effect, the occurrence of pozzolanic reaction strongly influences electrical resistance, reducing the risk of corrosion of the reinforcement inserted in the concrete.

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Section: Resultsmentioning

confidence: 95%

Influence of quartz powder and silica fume on the performance of Portland cement

Tavares

Costa

et al. 2020

Sci Rep

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“…Highlights are presented individually in Supplementary Table S2. Some studies have successfully demonstrated that calcination of tailings containing clay minerals [97,100,101] and grinding [97,102,103] are effective activation methods for mine tailings. Through calcination, kaolinite decomposes and produces a highly reactive amorphous material, i.e., metakaolinite.…”

Section: Supplementary Cementitious Materials (Scms)mentioning

confidence: 99%

Exploring the Potential for Utilization of Medium and Highly Sulfidic Mine Tailings in Construction Materials: A Review

et al. 2021

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Medium and highly sulfidic tailings are high-volume wastes that can lead to severe environmental damage if not properly managed. Due to the high content of sulfide minerals, these tailings can undergo weathering if put in contact with oxygen and water, generating acid mine drainage (AMD). The moderate-to-high sulfide content is also an important technical limitation for their implementation in the production of construction materials. This paper reviews the use of sulfidic tailings as raw material in construction products, with a focus on cement, concrete, and ceramics. When used as aggregates in concrete, this can lead to concrete degradation by internal sulfate attack. In building ceramics, their implementation without prior treatment is undesirable due to the formation of black reduction core, efflorescence, SOx emissions, and their associated costs. Moreover, their intrinsic low reactivity represents a barrier for their use as supplementary cementitious materials (SCMs) and as precursors for alkali-activated materials (AAMs). Nevertheless, the production of calcium sulfoaluminate (CSA) cement can be a suitable path for the valorization of medium and highly sulfidic tailings. Otherwise difficult to upcycle, sulfidic tailings could be used in the clinker raw meal as an alternative raw material. Not only the SO3 and SiO2-rich bulk material is incorporated into reactive clinker phases, but also some minor constituents in the tailings may contribute to the production of such low-CO2 cements at lower temperatures. Nevertheless, this valorization route remains poorly explored and demands further research.

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“…In 2019, world iron production was approximately 2.5 × 10 9 metric tons, with Australia and Brazil, with 930 × 10 6 and 480 × 10 6 metric tons respectively, being the largest producers [3]. Possible ways of recovering the iron mining waste include its use as catalysts for the synthesis of carbon nanomaterials [75], ceramic additive [76] and its incorporation into cement [29], concrete [77] or geopolymers [78]. The main results of the aimed at the synthesis of mullite-based ceramics from iron mining waste are described hereafter.…”

Section: Iron Mining Wastementioning

confidence: 99%

“…Several studies have reported on the valorization of mining waste in building materials. In this way, iron ore waste was used as a complementary cementitious material to prepare colored composite cements more resistant to acid attack than Portland cement [29]; gold ore tailings were used as siliceous raw material for cement production [30]. For this application, the cementitious/pozzolanic properties of mineral tailings can be improved by activation methods [31]; molybdenum tailings have been investigated as replacement of fine aggregates in structural concrete [32]; and copper tailings were evaluated as raw material for geopolymer manufacture.…”

Section: Introductionmentioning

confidence: 99%

Mullite-Based Ceramics from Mining Waste: A Review

et al. 2021

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Mullite (3Al2O3·2SiO2) is an aluminosilicate characterized by excellent physical properties, which makes it an important ceramic material. In this way, ceramics based on mullite find applications in different technological fields as refractory material (metallurgy, glass, ceramics, etc.), matrix in composite materials for high temperature applications, substrate in multilayer packaging, protective coatings, components of turbine engines, windows transparent to infrared radiation, etc. However, mullite is scarce in nature so it has to be manufactured through different synthesis methods, such as sintering, melting-crystallization or through a sol-gel route. Commonly, mullite is fabricated from pure technical grade raw materials, making the manufacturing process expensive. An alternative to lowering the cost is the use of mining waste as silica (SiO2) and alumina (Al2O3) feedstock, which are the necessary chemical compounds required to manufacture mullite ceramics. In addition to the economic benefits, the use of mining waste brings out environmental benefits as it prevents the over-exploitation of natural resources and reduces the volume of mining waste that needs to be managed. This article reviews the scientific studies carried out in order to use waste (steriles and tailings) generated in mining activities for the manufacture of clay-based ceramic materials containing mullite as a main crystalline phase.

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Iron ore tailings as a supplementary cementitious material in the production of pigmented cements

Cited by 62 publications

References 65 publications

Influence of quartz powder and silica fume on the performance of Portland cement

Influence of quartz powder and silica fume on the performance of Portland cement

Exploring the Potential for Utilization of Medium and Highly Sulfidic Mine Tailings in Construction Materials: A Review

Mullite-Based Ceramics from Mining Waste: A Review

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