Effect of alkali-mixed content and thermally untreated phosphate sludge dosages on some properties of metakaolin based geopolymer material

Hamdane, Hasna; Tamraoui, Youssef; Mansouri, Said; Oumam, Mina; Bouih, A.; Ghailassi, Touria El; Boulif, Rachid; Manoun, Bouchaib; Hannache, Hassan

doi:10.1016/j.matchemphys.2020.122938

Cited by 39 publications

(5 citation statements)

References 52 publications

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“…In addition, the participation of different original phases such as Heulandite, palygorskite and phlogopite to the alkali activation reactions was confirmed (Dabbebi et al 2020). Hamdane et al (2020) studied the effect of different modulus of NaOH and KOH as activators for phosphate slime and metakaolin precursors to synthesize geopolymer. The modulus of the NaOH and KOH highly affects the formed phases and, therefore, the materials' properties.…”

Section: Building Materialsmentioning

confidence: 93%

Management and valorization of phosphate beneficiation slime: a critical review

Dabbebi

Perumal

Moukannaa

2023

Int. J. Environ. Sci. Technol.

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The valorization of phosphate mine waste (PMW) in different fields has recently become attractive to many researchers. This review paper examines the potential use of PMW as a raw material in different applications toward sustainable management strategies. Dewatering, recovery of phosphate and heavy metals, building materials and ceramics applications have been captured in this paper. Based on the origin of deposit and the treatment during ore beneficiation, the PMW shows different mineral compositions and various percentage of chemical elements which make it suitable for most of the studied applications. The objective of this paper is to show the potential of the phosphate mine waste valorization and to identify the knowledge gap.

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Section: Building Materialsmentioning

confidence: 93%

Management and valorization of phosphate beneficiation slime: a critical review

Dabbebi

Perumal

Moukannaa

2023

Int. J. Environ. Sci. Technol.

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“…As the liquid phase is a complex mixture, these steps, in fact, occur simultaneously and can affect one another [ 19 ]. Much research can be found considering the effect of operating conditions on geopolymer synthesis and properties, namely, the type of various aluminosilicate raw materials (fly ash [ 14 ], blast furnace slag [ 20 ], metakaolin [ 21 ]), Si/Al ratio of raw material (and share of reactive silica and alumina) [ 22 ], alkaline activating agent concentration and dose [ 23 ], solid to liquid ratio [ 24 ], temperature and curing time [ 25 ]. In addition, the silicate-to-hydroxide ratio has been underlined to affect the geopolymerization process (shorter gelation time for higher silicate/hydroxide ratio) [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Decarbonatization of Energy Sector by CO2 Sequestration in Waste Incineration Fly Ash and Its Utilization as Raw Material for Alkali Activation

Mokrzycki,

Baran,

Gazda-Grzywacz

et al. 2023

Materials

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In this study, municipal solid waste incineration (MSWI) fly ash was subjected to mineral carbonation with the aim of investigating CO2 sequestration in waste material. The conducted study follows the trend of searching for alternatives to natural mineral materials with the ability to sequestrate CO2. The mineral carbonation of MSWI fly ash allowed for the storage of up to 0.25 mmol CO2 g−1. Next, both carbonated and uncarbonated MSWI fly ashes were activated using an alkaline activation method by means of two different activation agents, namely potassium hydroxide and potassium silicate or sodium hydroxide and sodium silicate. Mineral carbonation caused a drop in the compressive strength of alkali-activated materials, probably due to the formation of sodium and/or potassium carbonates. The maximum compressive strength obtained was 3.93 MPa after 28 days for uncarbonated fly ash activated using 8 mol dm−3 KOH and potassium hydroxide (ratio 3:1). The relative ratio of hydroxide:silicate also influenced the mechanical properties of the materials. Both carbonated and uncarbonated fly ashes, as well as their alkali-activated derivatives, were characterized in detail by means of XRD, XRF, and FTIR. Both uncarbonated and carbonated fly ashes were subjected to TG analysis. The obtained results have proved the importance of further research in terms of high-calcium fly ash (HCFA) utilization.

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“…The geopolymerization process converts the aluminosilicate material, for example kaolin, into geopolymer materials with desirable properties by chemically reacting with an alkaline activator solution [11][12][13]. Past research had concluded that the geopolymerization process typically involves dissolution, polycondensation, and curing stages.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Sintering Mechanism on the Crystallization Kinetics of Geopolymer-Based Ceramics

Mustapa,

Ahmad,

Al Bakri Abdullah

et al. 2023

Materials

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This research aims to study the effects of the sintering mechanism on the crystallization kinetics when the geopolymer is sintered at different temperatures: 200 °C, 400 °C, 600 °C, 800 °C, 1000 °C, and 1200 °C for a 3 h soaking time with a heating rate of 5 °C/min. The geopolymer is made up of kaolin and sodium silicate as the precursor and an alkali activator, respectively. Characterization of the nepheline produced was carried out using XRF to observe the chemical composition of the geopolymer ceramics. The microstructures and the phase characterization were determined by using SEM and XRD, respectively. The SEM micrograph showed the microstructural development of the geopolymer ceramics as well as identifying reacted/unreacted regions, porosity, and cracks. The maximum flexural strength of 78.92 MPa was achieved by geopolymer sintered at 1200 °C while the minimum was at 200 °C; 7.18 MPa. The result indicates that the flexural strength increased alongside the increment in the sintering temperature of the geopolymer ceramics. This result is supported by the data from the SEM micrograph, where at the temperature of 1000 °C, the matrix structure of geopolymer-based ceramics starts to become dense with the appearance of pores.

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Effect of alkali-mixed content and thermally untreated phosphate sludge dosages on some properties of metakaolin based geopolymer material

Cited by 39 publications

References 52 publications

Management and valorization of phosphate beneficiation slime: a critical review

Management and valorization of phosphate beneficiation slime: a critical review

Decarbonatization of Energy Sector by CO2 Sequestration in Waste Incineration Fly Ash and Its Utilization as Raw Material for Alkali Activation

Effect of the Sintering Mechanism on the Crystallization Kinetics of Geopolymer-Based Ceramics

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