Abstract
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 language | English |
|---|---|
| Pages (from-to) | 91-100 |
| Number of pages | 10 |
| Journal | International Journal of Mineral Processing |
| Volume | 60 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2000 Sep 1 |
| Externally published | Yes |
Keywords
- Gibbsite pseudo-boehmite
- Grinding
- Mechanical activation
- Transformation temperature
- α-alumina
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Geochemistry and Petrology