Solidification/stabilization (S/S) of high viscosity organics in geopolymers

Campos, M. De; Reeb, Charles; Davy, Catherine; Hosdez, Jérôme; Lambertin, David

doi:10.1016/j.jnucmat.2022.153979

Cited by 7 publications

(2 citation statements)

References 37 publications

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“…The constraint of the low viscosity of TBP and dodecane for solidification/stabilization (S/S) into geopolymers has already been observed by some authors 34) . These latter found that incorporation can be achieved by assembling a high viscosity organic (oil or grease) with the low viscosity OL, before mixing with the fresh GP.…”

Section: Methodsmentioning

confidence: 77%

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Pierlot,

Boland,

et al. 2024

J. Oleo Sci.

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ance of chemical stabilization of many compounds and produces a mechanically stable form of waste. Unfortunately, the stabilization of organic liquids (OL) in Ordinary Portland Cement (OPC) greatly retards and disrupts cement setting, and organic liquids generally form weak chemical bonds in cement unlike some inorganics 5,6) . Due to these disadvantages, geopolymers could be a solution to replace OPC for the incorporation of organic liquids and also for the treatment of OL waste.Since the resulting paste hardens to form a solid material (hardened GP) , mixing organic liquids (OL) with such aqueous suspensions 1, 2, 7, 8) has been recently described for the synthesis of porosity-controlled media, thermal insulating foams or filtration supports 9−13) and for the treatment of radioactive wastes 14,15) .In order to understand the immobilization of radioactive organic liquid wastes, alkanes 14,16) and paraffin oils 17) are used as model oils. The one-step incorporation process, which seems industrially more reasonable than the two-Abstract: The direct incorporation of low viscosity organic liquids (OL) such as dodecane and tributylphosphate (TBP) into fresh geopolymers (GP) is difficult and generally leads to variable amounts of un-incorporated OL remaining outside the hardened geopolymer. Experimentally, it is observed that a regular torque increase during OL incorporation corresponds to a suitable dispersion of the OL in the form of fine micrometric droplets. This can be obtained for TBP and dodecane by adding a small quantity of quaternary ammoniums salts (QAs) such as cetyltrimethylammonium bromide (CTAB). Shorter alkyl chains QAs, such as hexamethyltrimethylammonium (HMTA) can also be used but with a reduced efficiency. The positive impact of CTAB is then confirmed by the Washburn capillary rise method, showing that the interactions between TBP and CTAB-modified metakaolin are weaker compared to untreated powder. Finally, it is observed that the incorporation of TBP into geopolymer slurries is much easier than the incorporation of dodecane. The low interfacial tension measured between TBP and the activating solution (around 8 mN•m -1 ), contrasting with dodecane (29 mN•m -1 ), explains that the dispersion of TBP droplets in fresh metakaolin suspensions is more efficient.

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Section: Methodsmentioning

confidence: 77%

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Pierlot,

Boland,

et al. 2024

J. Oleo Sci.

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“…Therefore, there is a need to render EMR non-hazardous and resourceful. The harmless treatment of electrolytic manganese slag mainly includes water washing [ 4 ], acid leaching [ 5 ], electrokinetic restoration [ 6 ], solidification/stabilization (solidification/stabilization, S/S) technology [ 7 ], and other routes. The first three methods have high processing costs and complex technical routes, with scholars now favoring efficient, energy-saving, easy-to-operate S/S technology; compared with other S/S technologies, geopolymers have the advantages of fast setting and early strengthening, good durability, inexpensive costs, and low carbon emissions, which have attracted the attention of researchers [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Electrolytic Manganese Slag–Solid Waste-Based Geopolymers: Compressive Strength and Mn Immobilization

Mi,

Zhao,

et al. 2024

Materials

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The massive stockpiling of electrolytic manganese residue (EMR) has caused serious environmental pollution. In this study, EMR, coal gangue (CG), and fly ash (FA) were used as raw materials to obtain the optimal mix ratio based on Design-Expert mixture design. The effects of activator modulus, liquid–solid (L/S) ratio, and curing temperature on the mechanical properties of geopolymers were investigated. The results showed that the compressive strength of the prepared geopolymer was 12.0 MPa, and the 28d leaching of Mn was 0.123 mg/L under the conditions of EMR:CG:FA = 0.43:0.34:0.23, L/S = 0.9, a curing temperature of 60 °C, and a curing time of 24 h. This indicates that the geopolymer is an environmentally friendly material with high compressive strength. The mineral composition of the geopolymer is mainly hydrated calcium silicate and geopolymer gel. In addition, a more stable new mineral phase, MnSiO3, was generated. The Fourier transform infrared (FTIR) spectrogram showed that the peak at 1100 m−1 was shifted to 1112 cm−1, which indicated that a geopolymerization reaction had occurred. Through scanning electron microscopy (SEM) and energy dispersive spectrum (EDS) analysis, it was identified that the geopolymerization produced a large amount of amorphous gelatinous substances with a relatively dense structure, the major elements being oxygen, silicon, aluminum, calcium, and sodium.

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On the benefits of vegetable oil addition for the pore structure and acid resistance of alkali-activated systems

Rudić

Mittermayr

Gluth

et al. 2023

Ceramics International

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Solidification/stabilization (S/S) of high viscosity organics in geopolymers

Cited by 7 publications

References 37 publications

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Synthesis of Electrolytic Manganese Slag–Solid Waste-Based Geopolymers: Compressive Strength and Mn Immobilization

On the benefits of vegetable oil addition for the pore structure and acid resistance of alkali-activated systems

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