Use of alumina spent catalyst and RFCC wastes from petroleum refinery to substitute bauxite in the preparation of Portland clinker

Al-Dhamri, Hilal; Melghit, Khaled

doi:10.1016/j.jhazmat.2010.03.083

Cited by 50 publications

(14 citation statements)

References 11 publications

(12 reference statements)

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“…Around 200-500 kg d −1 of waste spent alumina catalyst is generated in petroleum refineries in Oman which are environmentally hazard. 2 Hydrometallurgical and pyrometallurgical methods are extensively used at industrial scale for the recovery of PGM's from the spent catalysts while electrochemical techniques are infrequently used. [3][4][5][6] The one-step electrochemical method was developed for the recovery of PGMs from the spent catalyst, where the process can be performed with an operating temperature between 973 and 1123 K. 7 A liquid bipolar electrode (LBE) divides the cell into two sections.…”

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confidence: 99%

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

Padamata

Yasinskiy

Polyakov

2021

J. Electrochem. Soc.

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Electrochemical behaviour of aluminium ions from the Pt/γ-Al2O3 spent catalyst in the eutectic [LiF (63.6 wt.%)–AlF3 (36.4 wt.%)]eutectic−5 wt.% CaF2 melt was studied by the means of cyclic voltammetry, chronopotentiometry and chronoamperometry methods. Tungsten rod (diameter 2 mm) was used as a working electrode. The XRD method was used to study the composition of melt collected near the working electrode and the spent catalyst. The aluminium reduction kinetics was studied concerning varying parameters like spent catalyst content in the melt and the temperature. The reduction of Al3+ ions on the tungsten electrode changed from diffusion-controlled to quasi-reversible process. The charge transfer coefficient and the diffusion coefficient were calculated from the data obtained from the above-mentioned methods. The estimated diffusion activation energy was 117.85 kJ.mole−1.

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confidence: 99%

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

Padamata

Yasinskiy

Polyakov

2021

J. Electrochem. Soc.

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“…Thermodynamic modelling enabled dosing more sustainable clinkers, optimising the composition of the raw meal, enhancing C 3 S, and reducing the CO 2 emitted by the raw materials. Al-Dhamri and Melghit 46 co-processed 3.5% SFCC and 86.8% limestone to produce a clinker with 67.2% C 3 S. Lin et al . 30 used 4% SFCC and 78.0% CaCO 3 and obtained 52.5% C 3 S. Limestone is the main raw material responsible for CO 2 emissions during the clinkering process, volatilising about 44% of its mass as this pollutant 5 , 78 .…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Costa,

Coppe,

Bielefeldt

et al. 2023

Sci Rep

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The valorisation of waste or by-products in Portland clinker production is a promising alternative for developing sustainable cements. The complexity of the chemical reactions during clinkering demands an adequate dosing method that considers the effect of feedstock impurities to maximise the potential substitution of natural resources by waste or by-products, while guaranteeing the clinker reactivity requirements. This study proposes a raw meal proportioning methodology for optimising co-processing of natural feedstocks with alternative raw materials in clinker production, intending to reduce the content of natural raw materials needed, while promoting an optimal clinker reactivity. A thermodynamic modelling sequence was developed considering the variability of raw materials composition and heating temperatures. The model was then validated by comparing simulation outcomes with results reported in previous studies. An experimental case study was conducted for validation of the proposed method using a spent fluid catalytic cracking catalyst (SFCC), a by-product from the oil industry as an alternative alumina source during clinkering. The modelling simulations indicated that substitution of natural feedstocks by 15 wt% SFCC promotes the formation of reactive clinkers with more than 54% tricalcium silicate (C3S). Mixes with the potential to form the highest C3S were then produced, and heating microscopy fusibility testing was applied for evaluating the clinkers’ stability. The main factors governing the reactivity and stability of the clinker phases were the melt phase content, alumina modulus, and formation of C3S and dicalcium silicate (C2S). The self-pulverisation of clinker during cooling was observed in selected mixes, and it is potentially associated with high viscosity and low Fe content in the melt phase. The proposed framework enables optimisation of the dosing of raw meals containing alternative alumina-rich feedstocks for clinker production and allows a deeper interpretation of limited sets of empirical data.

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“…In the same way, there are studies in which some methodologies are implemented, by which raw materials required in the manufacture of cement are partially replaced (11,(19)(20)(21). For these replacements, waste from the thermoelectric, steel, paper and ceramic industries, among others, are implemented (22).…”

Section: Introductionmentioning

confidence: 99%

Use of industrial wastes for the synthesis of belite clinker

2020

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The synthesis of belite clinker was studied using industrial wastes: paper sludge, cement kiln dust and rice husk ashes, as substitutes for natural raw materials. Wastes were characterized by XRF, XRD and TG analysis. Different formulations were prepared to produce clinker at 1300, 1350 and 1400 °C. The clinker obtained was characterized using optical microscopy, XRD and f-CaO content determined by ethylene glycol method. Finally, the hydration of prepared cements with the clinkers was evaluated by isothermal microcalorimetry. It was found that by mixing paper sludge, cement kiln dust and rice husk ashes, it is possible to obtain belite clinker with f-CaO content below 0.5%, in clinkering temperatures between 1350 °C and 1400 °C without the use of natural raw materials. It was found that these cements have a high hydration kinetic, far above the rate of Ordinary Portland Cement, due mainly by the amorphous phase content in clinkers obtained.

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Use of alumina spent catalyst and RFCC wastes from petroleum refinery to substitute bauxite in the preparation of Portland clinker

Cited by 50 publications

References 11 publications

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Use of industrial wastes for the synthesis of belite clinker

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Use of alumina spent catalyst and RFCC wastes from petroleum refinery to substitute bauxite in the preparation of Portland clinker

Cited by 50 publications

References 11 publications

The Cathodic Behavior of Aluminum from Pt/Al2O3 Catalysts in Molten LiF-AlF3-CaF2 and Implications for Metal Recovery from Spent Catalysts

The Cathodic Behavior of Aluminum from Pt/Al2O3 Catalysts in Molten LiF-AlF3-CaF2 and Implications for Metal Recovery from Spent Catalysts

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Use of industrial wastes for the synthesis of belite clinker

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The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts

The Cathodic Behavior of Aluminum from Pt/Al₂O₃ Catalysts in Molten LiF-AlF₃-CaF₂ and Implications for Metal Recovery from Spent Catalysts