Utilization of discarded bauxite tailings into eco-friendly foamed mixture lightweight soil

Peng, Yuansheng; Ou, Xiaoduo; Chen, Xiangsheng; Lin, Xiu; Shen, Xiang

doi:10.1016/j.jclepro.2021.130167

Cited by 28 publications

(4 citation statements)

References 26 publications

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“…The dry-wet cycling experiments were conducted to simulate the contact between FC and water and to evaluate the water stability performance of FC. In this study, the dry-wet cycle tests were conducted following the steps proposed by Peng et al [39]:…”

Section: Dry-wet Cycling Testmentioning

confidence: 99%

Strength, Durability, and Microstructure of Foamed Concrete Prepared Using Special Soil and Slag

Yang

Zhao

et al. 2022

Sustainability

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Foamed concrete (FC) is a lightweight building material widely used in thermal insulation walls, backfill, and other fields. Generally, foamed concrete is prepared using cement, which consumes a lot energy and resources. In this study, three kinds of special soil (SS) and slag powder (SP) were used to prepare foamed concrete. The content of SS was 25%, and the content of SP was 35%, 45%, and 55%. The mechanical properties, durability properties, and microstructure of special soil-slag foamed concrete (SSFC) were studied. With the increase in SP content, the water absorption and drying shrinkage of SSFC increased and the compressive strength of SSFC decreased. The water stability coefficients of SSFC were all higher than 0.7, which met the requirements of engineering applications. The porosity and the average diameter of pores of SSFC increased with the increase in SP content. The porosity of SSFC was less than 46% when the replacement percentage of SP was less than 35%. The successful application of SS and SP in foamed concrete provides an effective approach to waste utilization.

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Section: Dry-wet Cycling Testmentioning

confidence: 99%

Strength, Durability, and Microstructure of Foamed Concrete Prepared Using Special Soil and Slag

Yang

Zhao

et al. 2022

Sustainability

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“…Due to the late start of research on FLS in China, large-scale promotion and application are yet to be popularised, while FLS is generally not used for structural support and does not need to be studied for properties such as dry density, water absorption or thermal conductivity like foam concrete [ 27 , 28 , 29 ]. Many projects, depending on the geological soil conditions of the construction site and the surrounding service environment, require real-time targeted measures for the FLS in service [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Low-Carbon Foamed Lightweight Soil with High Resistance to Sulphate Erosion Environments

Wang¹,

Wan

Líu³

et al. 2023

Materials

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Foamed lightweight soil (FLS) is a lightweight cementitious material containing a large number of tiny closed pores and has been widely used as a filler in places such as railways, roads and airports. However, there has been little research into the resistance of FLS to sulphate attack in practical engineering applications. The performance of FLS against different sulphate erosion concentrations was studied to elucidate the engineering characteristics of using large volumes of FLS as fill material for the road base in the construction of intelligent networked vehicle test sites. The results showed that the compressive strength of FLS prepared using 30% Portland cement (C), 30% granulated blast furnace slag (GBFS), 40% fly ash (FA) and a small amount of a concrete antiseptic agent (CA) as cementitious materials reached 0.8 and 1.9 MPa at 7 and 28 d, respectively, when the wet density was about 600 kg/m3, which met the design requirements. The FLS prepared via the above-mentioned cementitious system had a low carbon emission, with a CO2 emission reduction rate of up to 70%. It also had excellent sulphate attack resistance: the corrosion resistance coefficient of the cementitious material system reached 0.97, which was considerably better than that of C (0.83). For an erosion medium environment with SO42− concentrations of less than 1000 mg/L (moderate), 40% GBFS or FA can be used to prepare FLS. When the concentration of SO42− is less than 4000 mg/L (severe), 30% C, 30% GBFS and 40% FA can be used as cementitious materials, preferably in combination with an appropriate amount of CA, to prepare FLS.

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“…[29]. Y. Peng et al have studied the use of BT as filler for foamed-mixture lightweight soil with promising results [30,31]. L. Yang et al concluded that BTs are a suitable raw material for the production of lightweight aggregates (LWA), due to their high concentration of glass-forming oxides [32].…”

Section: Introductionmentioning

confidence: 99%

Leaching Study of Guinean Bauxite Tailings in aqueous HCl Solution for the Extraction of Aluminum

Bagani,

Kotsanis,

Vafeias

et al. 2023

Sustainability

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Primary aluminum production is dependent on the Bayer process for Al2O3 refining and the Hall–Héroult process for Al production. Both these processes face serious sustainability challenges, while the overall Al supply chain is inflexible and prone to disruptions. One solution to the aforementioned challenges is the adoption of alternative Al2O3 production processes from a variety of primary and secondary raw materials. This research paper explores the potential use of bauxite tailings as an alternative secondary resource for alumina production, with an aqueous HCl process technology. Bauxite tailings are solid waste produced during the mining and beneficiation of certain bauxites before their digestion in the Bayer process. The research was conducted in two stages. Initially, 24 h trials using aqueous 5.9 M HCl solution and a 5:100 g/mL solid-to-liquid (S/L) ratio revealed complete dissolution of Al and near-complete dissolution of Fe. In the second stage, investigations involving higher S/L ratios under the same conditions confirmed that an S/L ratio of 20:100 g/mL represented the optimal parameters for bauxite tailings leaching, producing a 36.8 g/L Al and 25.2 g/L Fe concentration solutions. The PLS produced under the optimum conditions is suitable for downstream processing for the production of AlCl3·6H2O.

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Utilization of discarded bauxite tailings into eco-friendly foamed mixture lightweight soil

Cited by 28 publications

References 26 publications

Strength, Durability, and Microstructure of Foamed Concrete Prepared Using Special Soil and Slag

Strength, Durability, and Microstructure of Foamed Concrete Prepared Using Special Soil and Slag

Preparation and Properties of Low-Carbon Foamed Lightweight Soil with High Resistance to Sulphate Erosion Environments

Leaching Study of Guinean Bauxite Tailings in aqueous HCl Solution for the Extraction of Aluminum

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