Solidification/stabilization of gold mine tailings using calcium sulfoaluminate-belite cement

Kiventerä, Jenni; Piekkari, Katri; Isteri, Visa; Ohenoja, Katja; Tanskanen, Pekka; Illikainen, Mirja

doi:10.1016/j.jclepro.2019.118008

Cited by 75 publications

(26 citation statements)

References 38 publications

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“…The most frequently employed SCMs in the cement industry are discussed below: fly ash (FA) and/or ultrafine fly ash (UFFA) [35], silica fume (SF) [36,37] and natural pozzolanic materials like rice husk ash (RHA) [38][39][40], sugarcane bagasse ash (SBA) [41][42][43], sewage sludge ash (SSA) [44,45], palm oil fuel ash (POFA) [46][47][48][49], mine tailings [50][51][52][53], marble dust [54][55][56][57][58], construction and demolition debris (CDD) [59][60][61].…”

Section: Supplementary Cementitious Materials (Scms)mentioning

confidence: 99%

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

et al. 2020

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A sustainable solution for the global construction industry can be partial substitution of Ordinary Portland Cement (OPC) by use of supplementary cementitious materials (SCMs) sourced from industrial end-of-life (EOL) products that contain calcareous, siliceous and aluminous materials. Candidate EOL materials include fly ash (FA), silica fume (SF), natural pozzolanic materials like sugarcane bagasse ash (SBA), palm oil fuel ash (POFA), rice husk ash (RHA), mine tailings, marble dust, construction and demolition debris (CDD). Studies have revealed these materials to be cementitious and/or pozzolanic in nature. Their use as SCMs would decrease the amount of cement used in the production of concrete, decreasing carbon emissions associated with cement production. In addition to cement substitution, EOL products as SCMs have also served as coarse and also fine aggregates in the production of eco-friendly concretes.

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Section: Supplementary Cementitious Materials (Scms)mentioning

confidence: 99%

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

et al. 2020

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“…Nevertheless, the immobilization of oxyanions, i.e., (CrO 4 ) 2− , (Cr 2 O 7 ) 2− [90,92], SeO 2− [91] can be more challenging and dependent on the gypsum addition. In CSAB cementitious systems containing up to 50% cement replacement with low sulfidic tailings, a study also shows an effective reduction in the release of heavy metals and sulfate in leaching tests [93]. Even for challenging elements (As, V) immobilization was achieved already after 7 days of hydration, and improved after longer curing times.…”

Section: Clinker Productionmentioning

confidence: 88%

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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“…Calcium sulphoaluminate cements (CSA) are promoted as one of the most promising cementitious materials due to their outstanding properties such as lower CO 2 emissions [ 1 ], fast setting and hardening, high early strength [ 2 ], impermeability [ 3 ] and good durability [ 4 ]. In recent years, CSA has been attracting more and more attention in the fast repairing of civil structures [ 5 ], waste stabilization/solidification [ 6 ], as expansion material for shrinkage compensation [ 7 , 8 ] and low-temperature construction projects [ 9 ]. C 4 A 3 is the main mineral in the composition of sulphoaluminate cements clinkers.…”

Section: Introductionmentioning

confidence: 99%

Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures

Lan

Chen

et al. 2020

Materials

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Sulphoaluminate cement has the advantage of low-temperature application performance, but its hydration mechanism at low temperatures is not yet clear. Anhydrous calcium sulfoaluminate (C4A3S) is the main mineral in the composition of sulfoaluminate cement clinkers. In this paper, C4A3S mixed with gypsum (CaSO4∙2H2O) to form a C4A3S-CSH2 cement system; X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG), scanning electron microscopy (SEM) and mercury intrusion analysis (MIP) to clarify the effect of temperatures on the hydration properties of C4A3S-CSH2 cement system. The results showed that hydration of the C4A3S-CSH2 cement system could carry on at low temperatures, even at −15 °C. The main hydration product was ettringite. Low temperatures did not change the types of the hydration products, but the low temperature of 0 °C was more favorable for the formation of ettringite. The early hydration of the C4A3S-CSH2 cement system was inhibited by the decrease in temperature. However, hydration of the cement at 0 °C continued at a high rate after one day. Morphologies of the ettringite for the C4A3S-CSH2 cement system at −15 °C were needle-like structures, while they were of columnar structure at 0 °C. The compressive strength of samples at 0 °C reached 82 MPa, which is significantly higher than that at 20 °C.

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Solidification/stabilization of gold mine tailings using calcium sulfoaluminate-belite cement

Cited by 75 publications

References 38 publications

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

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

Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures

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