自然科学版 英文版
自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 9    September 2020

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Comparison of microwave and conventional heating routes for kaolin thermal activation
ZHANG Liang-jing(张良静)1, 2, HE Yuan(和媛)1, 2, Lü Peng(吕鹏)1, 2, PENG Jin-hui(彭金辉)1, 2, LI Shi-wei(李世伟)1, 2, CHEN Kai-hua(陈楷华)1, 2, YIN Shao-hua(尹少华)1, 2, ZHANG Li-bo(张利波)1, 2

1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,Kunming 650093, China;
2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China;

Abstract:The effect of activation properties of the precursors of zeolite directly prepared from kaolin influenced by microwave field and conventional heating was investigated. XRD, TG-DSC, FT-IR, SEM, particle size analysis, specific surface area (BET), pore size distribution (BJH) and N2 adsorption-desorption were discussed to determine the optimal activation temperature. It is concluded that the conversion of kaolin to metakaolin in the microwave field is at 500 °C holding for 30 min, which is 100 °C lower than that in conventional calcination and 90 min shorter, and the phase transition process of kaolin under the effect of microwave field is the same as that of conventional heating method. SEM analysis indicates that the particle size is more uniform and agglomeration appears slightly in the microwave field. The N2 adsorption-desorption isotherm, BET and BJH of kaolin indicate that the pore properties are almost invariable regardless of calcination route during the process of calcining kaolin into metakaolin. It indicates that microwave calcination is superior to conventional calcination in the activation pathway of kaolin. It is attributed to microwave heating relying on objects to absorb microwave energy and convert it into thermal energy, which can simultaneously and uniformly heat the entire substance.

 

Key words: kaolin; thermal activation; metakaolin; microwave

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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