Mechanism and kinetics of the BaMgAl10O17:Eu2+ alkaline fusion reaction

Knowledge of the kinetics and mechanism of BaMgAl10O17:Eu2+ (BAM) fusion with sodium hydroxide will benefit recycling rare earth elements (REEs) from the waste phosphors. The reaction temperature range of 290–375 °C and the reaction mechanism were determined using X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Activation energy was determined by the four model-free methods, and calculated results showed that the Kissinger method value of 579.5 KJ/mol was close to the average value of the Kissinger-Akahira-Sunose (KAS) and the Flynn-Wall-Ozawa (FWO) methods of 563.5 kJ/mol. The calculated activation energy variation tendency versus conversion factor agreed with the proposed mechanism.

Activation energy changes of BaMgAl10O17:Eu2+ alkaline fusion reaction with the conversion factor obtained by the KAS, FWO and Friedman methodsFigure optionsDownload full-size imageDownload as PowerPoint slide