Carbochlorination Kinetics of High-Alumina Fly Ash
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The carbochlorination kinetics of high-alumina fly ash was investigated. The influence of reaction temperature, time, carbon content, pellet diameter, and Cl2 flow rate on the reaction was analyzed. The morphological changes of the samples during the reaction showed that different sizes of spherical particles disappeared entirely after the carbochlorination process. For carbochlorination of alumina, two kinetic regimes were identified, with activation energy of 68.84 kJ mol−1 and 20.82 kJ mol−1, being attributed to chemical reaction control (below 900°C) and diffusion control (at high temperatures). For silica, the dominant kinetic regime was chemical reaction control, with activation energy of 92.45 kJ mol−1 between 950°C and 1050°C.
This work was supported by the National Natural Science Foundation of China (U1710257, U1702253, 51504059), Fundamental Research Funds for the Central Universities of China (N162504016), and State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources (YY2016006).
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