Materials Transactions Online

Materials Transactions, Vol.54 No.03 (2013) pp.380-383
© 2013 The Japan Institute of Metals

Mechanochemical Activation on the Preparation of β-Eucryptite from Powder Mixture of Pyrophyllite, Gibbsite and Lithium Carbonate

Wantae Kim1, Kwanho Kim1, Hoon Lee1, Minchul Shin2 and Sangbae Kim1

1Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-ro, Yuseong-gu, Daejeon 305-350, Korea
2Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Korea

β-eucryptite (Li2O·Al2O3·2SiO2) was prepared by mechanochemical activation followed by calcination of the powder mixture containing pyrophyllite, gibbsite and lithium carbonate. XRD and FT-IR results showed that the crystallization of β-eucryptite occurred from the milled mixture by calcination. Dry milling using a planetary mill promoted the amorphization of the mixture. The crystallization of β-eucryptite increased with increment of milling time and calcination temperature. Trace amount of undesired phases such as cristobalite and quartz disappeared completely at 950°C in the mixture milled for 120 min. The thermal expansion behavior characteristics were found to be strongly influenced by the milling time of the constituent powder mixture and calcination temperature.

(Received 2012/10/04; Accepted 2012/12/12; Published 2013/02/25)

Keywords: β-eucryptite, mechanochemical activation, crystallization, thermal expansion, pyrophyllite

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