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A new foamed ceramic was successfully synthesized entirely from coal fly ash (CFA). Before sintering, the CFA was pretreated with an alkali activation that evenly coated CFA particles with a layer of hydroxysodalite crystals. Because of the pretreatment, the alkali activated CFA underwent a self-foaming reaction during sintering. When sintered at 1200 °C, the foamed ceramics exhibited optimal properties,...
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