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Received March 18, 2018
Accepted June 13, 2018
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Leaching characteristics and kinetics of the metal impurities present in rice husk during pretreatment for the production of nanosilica particles
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China 1Faculty of Engineering, The University of Nottingham, Nottingham NG7 2RD, United Kingdom, UK
rushan@hit.edu.cn
Korean Journal of Chemical Engineering, September 2018, 35(9), 1911-1918(8)
https://doi.org/10.1007/s11814-018-0103-z
https://doi.org/10.1007/s11814-018-0103-z
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Abstract
Fundamental studies on the removal of metal impurities are essential for the production of nanosilica by combustion. This study reports the leaching characteristics, leaching kinetics and occurrence form of the metal impurities present in rice husk based on acid pretreatment. Acid pretreatment removes most of the metal impurities present in rice husk. In particular, 98wt% removal of potassium can be reached. The acid concentration, leaching time and reagent type have significant effects on the leaching of metal impurities, and optimal conditions exist for the acid pretreatment process. Furthermore, the leaching of metal impurities occurs through two stages, and parts of the metal impurities exist in organic-bound form, which can be leached through ion exchange. The results show that the pseudosecond- order model is suitable for describing the leaching kinetics of the metal impurities present in rice husk, and empirical formulas for predicting the metal contents leached from rice husk during acid pretreatment at ambient temperature are also obtained. Additionally, the different occurrence form and quantities of metal impurities in rice husk lead to different leaching effects, which strongly influences the chemical properties and quality of the obtained silica particles.
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