Application of dry grinding to reduction in transformation temperature of aluminum hydroxides

Junya Kano, Shu Saeki, Fumio Saito, Mitsuo Tanjo, Shuichi Yamazaki

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Dry grinding of gibbsite (α-Al(OH)3) and pseudo (p)-boehmite (γ-AlO(OH)) powder samples separately, with and without fine α-alumina powder as a seed, was conducted using a planetary ball mill to investigate effects of grinding and addition of the seed on their transformation temperatures to α-phase during heating. The transformation temperatures of both samples reduced to below 1000°C with increasing grinding time as well as the amount of seed. The transformation temperatures depend on the grinding time and the amount of seed, and the minimum temperatures are about 910°C for gibbsite and about 950°C for p-boehmite when they are ground for more than 60 min with an equivalent amount of the seed powder. Combination of grinding with addition of the seed would be an effective operation for the reduction in the transformation temperature of both compounds to α-phase. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)91-100
Number of pages10
JournalInternational Journal of Mineral Processing
Issue number2
Publication statusPublished - 2000 Sept


  • α-alumina
  • Gibbsite pseudo-boehmite
  • Grinding
  • Mechanical activation
  • Transformation temperature


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