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- W2917554311 abstract "Hydrotalcite (HT) and hydrocalumite (HC) were synthesized from active MgO, CaO and Al2O3 in the presence of K2CO3 using microwave-hydrothermal (M−H) process at 100 °C/1 h. The above active oxides were prepared via HCl leaching of dolomite (fine waste of concrete aggregate) and Al-dross waste, precipitated as hydroxides and then activated by calcination. The prepared materials were characterized via XRD, FTIR and TEM. Results showed that chemical recycling of Al-dross and dolomite wastes produced aluminum, magnesium and calcium hydroxides from which their active oxides produced at 600, 900 and 1000 °C, respectively. The M−H treatment of MgO/Al2O3 (4:1) slurry of the active oxides for 1 h at 100 °C resulted in Mg2Al(OH)7 in amorphous plate-like shape while the CaO/Al2O3 (4:1) slurry under the same conditions provided semi-crystalline multi-phases. These phases were identified through X-ray diffraction (XRD) analysis as Katoite [Ca3Al2(OH)12] and calcium aluminum hydroxides [Ca2Al(OH)7·3H2O]. In the presence of K2CO3, MgO/Al2O3 and CaO/Al2O3 slurries produced nano-sized crystalline hydrotalcite or hydrocalumite as deduced from XRD, FTIR and TEM results." @default.
- W2917554311 created "2019-03-02" @default.
- W2917554311 creator A5001319976 @default.
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- W2917554311 date "2019-05-01" @default.
- W2917554311 modified "2023-10-01" @default.
- W2917554311 title "Hydrotalcite and hydrocalumite as resources from waste materials of concrete aggregate and Al-dross by microwave-hydrothermal process" @default.
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- W2917554311 doi "https://doi.org/10.1016/j.conbuildmat.2019.02.105" @default.
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