Desilication Reaction and Kinetics of Aluminum-Extracting Silicon Slag in NaOH Solution

Abstract

Abstract: The desilication behavior of amorphous SiO₂ in NaOH solution was studied by taking aluminum silicon slag extracted from an acid method fly ash in Inner Mongolia as the object. Through the change of desilication rate with time in the desilication reaction, the effects of stirring speed, reaction temperature and NaOH solution concentration on the desilication rate of SiO₂ were studied. By fitting the experimental data, the kinetic law and macroscopic kinetic equation of desilication reaction were determined, and the corresponding apparent activation energy was calculated. The results show that the stirring speed has little effect on the desilication rate, and the desilication rate greatly increases by increasing the reaction temperature and concentration of NaOH. The desilication reaction of aluminum-extracting silicon slag in NaOH solution is controlled by chemical reaction and conforms to Avrami equation. The apparent activation energy of desilication reaction is 82.086 kJ/mol.

Key words: aluminum-extracting silicon slag, SiO₂, desilication reaction, kinetics, Avrami equation

CLC Number:

TF80

XIAO Yongfeng, CHEN Aiguo, ZHANG Yuwei, JIANG Xiaolin, LIU Huidong. Desilication Reaction and Kinetics of Aluminum-Extracting Silicon Slag in NaOH Solution[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 542-547.

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