Solidification/stabilization of chromium slag in red mud-based geopolymer

Luo, Zhenmin; Zhi, Tianyi; Liu, Lei; Mi, Jie; Zhang, Meng; Tian, Chongfei; Si, Zhengkai; Liu, Xiaohai; Mu, Yuandong

doi:10.1016/j.conbuildmat.2021.125813

Cited by 22 publications

(5 citation statements)

References 39 publications

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“…This slowdown impacted the increment of compressive strength and even led to a downward trend. 31,32 Huang et al 2017 (ref. 1) demonstrated that appropriate ratios between SiO 2 and Na 2 O can lead to increased compressive strength.…”

Section: Resultsmentioning

confidence: 99%

Preparation and application of alkali-activated cementitious materials in solidification/stabilization of chromite ore processing residue

Su,

Zhao,

Wang

et al. 2024

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Preparation and application of alkali-activated cementitious materials in solidification/stabilization of chromite ore processing residue

Su,

Zhao,

Wang

et al. 2024

RSC Adv.

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“…(3) The solidification/stabilization of Cr by PCCPB is due to the physical adsorption of hydration products such as C-(A)-S-H gels and sodalite. In addition, hydration refines the pore structure and blocks the transport channels of Cr ions, facilitating solidification/stabilization [ 88 ]. Calcite, calcium silicate, calcium hydroxide, and calcium silicate may play a key role in immobilizing As species and heavy metals in PCCPB [ 89 ].…”

Section: Resultsmentioning

confidence: 99%

Preliminary Study of Preheated Decarburized Activated Coal Gangue-Based Cemented Paste Backfill Material

et al. 2023

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This study proposes a novel idea of the use of coal gangue (CG) activation and preheated decarburized activated coal CG-based cemented paste backfill material (PCCPB) to realize green mining. PCCPB was prepared with preheated decarburized coal CG (PCG), FA, activator, low-dose cement, and water. This idea realized scale disposal and resource utilization of coal CG solid waste. Decarbonization and activation of CG crushed the material to less than 8 mm by preheated combustion technology at a combustion temperature of 900 °C and a decarbonization activation time of 4 min. The mechanism of the effect of different Na2SO4 dosages on the performance of PCCPB was investigated using comprehensive tests (including mechanical property tests, microscopic tests, and leaching toxicity tests). The results show that the uniaxial compressive strength (UCS) of C-S2, C-S3, and C-S4 can meet the requirements of backfill mining, among which the UCS of C-S3 with a curing time of 3 d and 28 d were 0.545 MPa and 4.312 MPa, respectively. Na2SO4 excites PCCPB at different curing time, and the UCS of PCCPB increases and then decreases with the increase in Na2SO4 dosage, and 3% of Na2SO4 had the best excitation effect on the late strength (28 d) of PCCPB. All groups’ (control and CS1-CS4 groups) leachate heavy metal ions met the requirements of groundwater class III standard, and PCCPB had a positive effect on the stabilization/coagulation of heavy metal ions (Mn, Zn, As, Cd, Hg, Pb, Cr, Ba, Se, Mo, and Co). Finally, the microstructure of PCCPB was analyzed using FTIR, TG/DTG, XRD, and SEM. The research is of great significance to promote the resource utilization of coal CG residual carbon and realize the sustainable consumption of coal CG activation on a large scale.

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“…In this view, aluminosilicate geopolymer materials have attracted research on their use not only as construction materials, but also as ion exchangers in effective water remediation processes [2,3], since their synthesis is easy and low-cost, necessitating natural and available (waste) materials. They are obtained through alkali activation: (i) either directly from natural minerals (such as kaolin [3] and metakaolin [4][5][6]), or (ii) from industrial products/wastes (such as fly ash and blast furnace slag [7][8][9], red mud [10], and brick [11,12]).…”

Section: Introductionmentioning

confidence: 99%

Insight into Adsorption Kinetics of Cs+, Rb+, Co2+, and Sr2+ on a Zeolites-Based Composite: Comprehensive Diffusional Explanation and Modelling

Boughriet,

Doyemet,

Poumaye

et al. 2024

Applied Sciences

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Kaolinite-rich soils were used to prepare zeolite-based composites via alkaline activation. The porous material was characterized by conducting XRD and microporosity measurements, as well as ESEM microscopy. The Weber and Morris (W-M) model was used for studying adsorption kinetics of radioactive cations on synthesized alkali-activated material. These investigations evidenced the effects of pore structure and the importance of the intrinsic characteristics of hydrated cations (ionic potential; hydrated radius; B-viscosity parameter; molar Gibbs energy of hydration of cation) on W-M kinetic rate constants. The application of diffusion-based models permitted us to assess the key diffusion parameters controlling successive diffusion regimes, and to reveal strong contributions of surface diffusion to adsorption kinetics during the course of the second and third kinetics stages of the W-M model. The magnitude of the surface diffusion coefficient was related to the capacity of hydrated cationic species to lose water molecules when penetrating brick pores. The HSDM model were tested for predicting radionuclide adsorption in a fixed-bed column. A breakthrough curve simulation indicated the predominance of the surface diffusion regime, which was in agreement with mathematical analysis of (batch) adsorption kinetics data. Ionic diffusion was linked to the characteristics of capillary porosity and connectivity of capillary pores in the composite, suggesting the generation of hydrated nuclides and their immobilization in the form of outer-sphere complexes.

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Solidification/stabilization of chromium slag in red mud-based geopolymer

Cited by 22 publications

References 39 publications

Preparation and application of alkali-activated cementitious materials in solidification/stabilization of chromite ore processing residue

Preparation and application of alkali-activated cementitious materials in solidification/stabilization of chromite ore processing residue

Preliminary Study of Preheated Decarburized Activated Coal Gangue-Based Cemented Paste Backfill Material

Insight into Adsorption Kinetics of Cs+, Rb+, Co2+, and Sr2+ on a Zeolites-Based Composite: Comprehensive Diffusional Explanation and Modelling

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